Source code for pyqtgraph.graphicsItems.ROI

"""
ROI.py -  Interactive graphics items for GraphicsView (ROI widgets)
Copyright 2010  Luke Campagnola
Distributed under MIT/X11 license. See license.txt for more information.

Implements a series of graphics items which display movable/scalable/rotatable shapes
for use as region-of-interest markers. ROI class automatically handles extraction 
of array data from ImageItems.

The ROI class is meant to serve as the base for more specific types; see several examples
of how to build an ROI at the bottom of the file.
"""

import sys
import warnings
from math import atan2, cos, degrees, hypot, sin

import numpy as np

from .. import functions as fn

#from numpy.linalg import norm
from ..Point import Point
from ..Qt import QtCore, QtGui, QtWidgets
from ..SRTTransform import SRTTransform
from .GraphicsObject import GraphicsObject
from .UIGraphicsItem import UIGraphicsItem

translate = QtCore.QCoreApplication.translate

__all__ = [
    'ROI', 
    'TestROI', 'RectROI', 'EllipseROI', 'CircleROI', 'PolygonROI', 
    'LineROI', 'MultiLineROI', 'MultiRectROI', 'LineSegmentROI', 'PolyLineROI', 
    'CrosshairROI','TriangleROI'
]


def rectStr(r):
    return "[%f, %f] + [%f, %f]" % (r.x(), r.y(), r.width(), r.height())

[docs]class ROI(GraphicsObject): """ Generic region-of-interest widget. Can be used for implementing many types of selection box with rotate/translate/scale handles. ROIs can be customized to have a variety of shapes (by subclassing or using any of the built-in subclasses) and any combination of draggable handles that allow the user to manipulate the ROI. Default mouse interaction: * Left drag moves the ROI * Left drag + Ctrl moves the ROI with position snapping * Left drag + Alt rotates the ROI * Left drag + Alt + Ctrl rotates the ROI with angle snapping * Left drag + Shift scales the ROI * Left drag + Shift + Ctrl scales the ROI with size snapping In addition to the above interaction modes, it is possible to attach any number of handles to the ROI that can be dragged to change the ROI in various ways (see the ROI.add____Handle methods). ================ =========================================================== **Arguments** pos (length-2 sequence) Indicates the position of the ROI's origin. For most ROIs, this is the lower-left corner of its bounding rectangle. size (length-2 sequence) Indicates the width and height of the ROI. angle (float) The rotation of the ROI in degrees. Default is 0. invertible (bool) If True, the user may resize the ROI to have negative width or height (assuming the ROI has scale handles). Default is False. maxBounds (QRect, QRectF, or None) Specifies boundaries that the ROI cannot be dragged outside of by the user. Default is None. snapSize (float) The spacing of snap positions used when *scaleSnap* or *translateSnap* are enabled. Default is 1.0. scaleSnap (bool) If True, the width and height of the ROI are forced to be integer multiples of *snapSize* when being resized by the user. Default is False. translateSnap (bool) If True, the x and y positions of the ROI are forced to be integer multiples of *snapSize* when being resized by the user. Default is False. rotateSnap (bool) If True, the ROI angle is forced to a multiple of the ROI's snap angle (default is 15 degrees) when rotated by the user. Default is False. parent (QGraphicsItem) The graphics item parent of this ROI. It is generally not necessary to specify the parent. pen (QPen or argument to pg.mkPen) The pen to use when drawing the shape of the ROI. hoverPen (QPen or argument to mkPen) The pen to use while the mouse is hovering over the ROI shape. handlePen (QPen or argument to mkPen) The pen to use when drawing the ROI handles. handleHoverPen (QPen or argument to mkPen) The pen to use while the mouse is hovering over an ROI handle. movable (bool) If True, the ROI can be moved by dragging anywhere inside the ROI. Default is True. rotatable (bool) If True, the ROI can be rotated by mouse drag + ALT resizable (bool) If True, the ROI can be resized by mouse drag + SHIFT removable (bool) If True, the ROI will be given a context menu with an option to remove the ROI. The ROI emits sigRemoveRequested when this menu action is selected. Default is False. ================ =========================================================== ======================= ==================================================== **Signals** sigRegionChangeFinished Emitted when the user stops dragging the ROI (or one of its handles) or if the ROI is changed programatically. sigRegionChangeStarted Emitted when the user starts dragging the ROI (or one of its handles). sigRegionChanged Emitted any time the position of the ROI changes, including while it is being dragged by the user. sigHoverEvent Emitted when the mouse hovers over the ROI. sigClicked Emitted when the user clicks on the ROI. Note that clicking is disabled by default to prevent stealing clicks from objects behind the ROI. To enable clicking, call roi.setAcceptedMouseButtons(QtCore.Qt.MouseButton.LeftButton). See QtWidgets.QGraphicsItem documentation for more details. sigRemoveRequested Emitted when the user selects 'remove' from the ROI's context menu (if available). ======================= ==================================================== """ sigRegionChangeFinished = QtCore.Signal(object) sigRegionChangeStarted = QtCore.Signal(object) sigRegionChanged = QtCore.Signal(object) sigHoverEvent = QtCore.Signal(object) sigClicked = QtCore.Signal(object, object) sigRemoveRequested = QtCore.Signal(object) def __init__(self, pos, size=Point(1, 1), angle=0.0, invertible=False, maxBounds=None, snapSize=1.0, scaleSnap=False, translateSnap=False, rotateSnap=False, parent=None, pen=None, hoverPen=None, handlePen=None, handleHoverPen=None, movable=True, rotatable=True, resizable=True, removable=False, aspectLocked=False): GraphicsObject.__init__(self, parent) self.setAcceptedMouseButtons(QtCore.Qt.MouseButton.NoButton) pos = Point(pos) size = Point(size) self.aspectLocked = aspectLocked self.translatable = movable self.rotatable = rotatable self.resizable = resizable self.removable = removable self.menu = None self.freeHandleMoved = False ## keep track of whether free handles have moved since last change signal was emitted. self.mouseHovering = False if pen is None: pen = (255, 255, 255) self.setPen(pen) if hoverPen is None: hoverPen = (255, 255, 0) self.hoverPen = fn.mkPen(hoverPen) if handlePen is None: handlePen = (150, 255, 255) self.handlePen = fn.mkPen(handlePen) if handleHoverPen is None: handleHoverPen = (255, 255, 0) self.handleHoverPen = handleHoverPen self.handles = [] self.state = {'pos': Point(0,0), 'size': Point(1,1), 'angle': 0} ## angle is in degrees for ease of Qt integration self.lastState = None self.setPos(pos) self.setAngle(angle) self.setSize(size) self.setZValue(10) self.isMoving = False self.handleSize = 5 self.invertible = invertible self.maxBounds = maxBounds self.snapSize = snapSize self.translateSnap = translateSnap self.rotateSnap = rotateSnap self.rotateSnapAngle = 15.0 self.scaleSnap = scaleSnap self.scaleSnapSize = snapSize # Implement mouse handling in a separate class to allow easier customization self.mouseDragHandler = MouseDragHandler(self) def getState(self): return self.stateCopy() def stateCopy(self): sc = {} sc['pos'] = Point(self.state['pos']) sc['size'] = Point(self.state['size']) sc['angle'] = self.state['angle'] return sc
[docs] def saveState(self): """Return the state of the widget in a format suitable for storing to disk. (Points are converted to tuple) Combined with setState(), this allows ROIs to be easily saved and restored.""" state = {} state['pos'] = tuple(self.state['pos']) state['size'] = tuple(self.state['size']) state['angle'] = self.state['angle'] return state
[docs] def setState(self, state, update=True): """ Set the state of the ROI from a structure generated by saveState() or getState(). """ self.setPos(state['pos'], update=False) self.setSize(state['size'], update=False) self.setAngle(state['angle'], update=update)
def setZValue(self, z): QtWidgets.QGraphicsItem.setZValue(self, z) for h in self.handles: h['item'].setZValue(z+1)
[docs] def parentBounds(self): """ Return the bounding rectangle of this ROI in the coordinate system of its parent. """ return self.mapToParent(self.boundingRect()).boundingRect()
[docs] def setPen(self, *args, **kwargs): """ Set the pen to use when drawing the ROI shape. For arguments, see :func:`mkPen <pyqtgraph.mkPen>`. """ self.pen = fn.mkPen(*args, **kwargs) self.currentPen = self.pen self.update()
[docs] def size(self): """Return the size (w,h) of the ROI.""" return self.getState()['size']
[docs] def pos(self): """Return the position (x,y) of the ROI's origin. For most ROIs, this will be the lower-left corner.""" return self.getState()['pos']
[docs] def angle(self): """Return the angle of the ROI in degrees.""" return self.getState()['angle']
[docs] def setPos(self, pos, y=None, update=True, finish=True): """Set the position of the ROI (in the parent's coordinate system). Accepts either separate (x, y) arguments or a single :class:`Point` or ``QPointF`` argument. By default, this method causes both ``sigRegionChanged`` and ``sigRegionChangeFinished`` to be emitted. If *finish* is False, then ``sigRegionChangeFinished`` will not be emitted. You can then use stateChangeFinished() to cause the signal to be emitted after a series of state changes. If *update* is False, the state change will be remembered but not processed and no signals will be emitted. You can then use stateChanged() to complete the state change. This allows multiple change functions to be called sequentially while minimizing processing overhead and repeated signals. Setting ``update=False`` also forces ``finish=False``. """ if update not in (True, False): raise TypeError("update argument must be bool") if y is None: pos = Point(pos) else: # avoid ambiguity where update is provided as a positional argument if isinstance(y, bool): raise TypeError("Positional arguments to setPos() must be numerical.") pos = Point(pos, y) self.state['pos'] = pos QtWidgets.QGraphicsItem.setPos(self, pos) if update: self.stateChanged(finish=finish)
[docs] def setSize(self, size, center=None, centerLocal=None, snap=False, update=True, finish=True): """ Set the ROI's size. =============== ========================================================================== **Arguments** size (Point | QPointF | sequence) The final size of the ROI center (None | Point) Optional center point around which the ROI is scaled, expressed as [0-1, 0-1] over the size of the ROI. centerLocal (None | Point) Same as *center*, but the position is expressed in the local coordinate system of the ROI snap (bool) If True, the final size is snapped to the nearest increment (see ROI.scaleSnapSize) update (bool) See setPos() finish (bool) See setPos() =============== ========================================================================== """ if update not in (True, False): raise TypeError("update argument must be bool") size = Point(size) if snap: size[0] = round(size[0] / self.scaleSnapSize) * self.scaleSnapSize size[1] = round(size[1] / self.scaleSnapSize) * self.scaleSnapSize if centerLocal is not None: oldSize = Point(self.state['size']) oldSize[0] = 1 if oldSize[0] == 0 else oldSize[0] oldSize[1] = 1 if oldSize[1] == 0 else oldSize[1] center = Point(centerLocal) / oldSize if center is not None: center = Point(center) c = self.mapToParent(Point(center) * self.state['size']) c1 = self.mapToParent(Point(center) * size) newPos = self.state['pos'] + c - c1 self.setPos(newPos, update=False, finish=False) self.prepareGeometryChange() self.state['size'] = size if update: self.stateChanged(finish=finish)
[docs] def setAngle(self, angle, center=None, centerLocal=None, snap=False, update=True, finish=True): """ Set the ROI's rotation angle. =============== ========================================================================== **Arguments** angle (float) The final ROI angle in degrees center (None | Point) Optional center point around which the ROI is rotated, expressed as [0-1, 0-1] over the size of the ROI. centerLocal (None | Point) Same as *center*, but the position is expressed in the local coordinate system of the ROI snap (bool) If True, the final ROI angle is snapped to the nearest increment (default is 15 degrees; see ROI.rotateSnapAngle) update (bool) See setPos() finish (bool) See setPos() =============== ========================================================================== """ if update not in (True, False): raise TypeError("update argument must be bool") if snap is True: angle = round(angle / self.rotateSnapAngle) * self.rotateSnapAngle self.state['angle'] = angle tr = QtGui.QTransform() # note: only rotation is contained in the transform tr.rotate(angle) if center is not None: centerLocal = Point(center) * self.state['size'] if centerLocal is not None: centerLocal = Point(centerLocal) # rotate to new angle, keeping a specific point anchored as the center of rotation cc = self.mapToParent(centerLocal) - (tr.map(centerLocal) + self.state['pos']) self.translate(cc, update=False) self.setTransform(tr) if update: self.stateChanged(finish=finish)
[docs] def scale(self, s, center=None, centerLocal=None, snap=False, update=True, finish=True): """ Resize the ROI by scaling relative to *center*. See setPos() for an explanation of the *update* and *finish* arguments. """ newSize = self.state['size'] * s self.setSize(newSize, center=center, centerLocal=centerLocal, snap=snap, update=update, finish=finish)
[docs] def translate(self, *args, **kargs): """ Move the ROI to a new position. Accepts either (x, y, snap) or ([x,y], snap) as arguments If the ROI is bounded and the move would exceed boundaries, then the ROI is moved to the nearest acceptable position instead. *snap* can be: =============== ========================================================================== None (default) use self.translateSnap and self.snapSize to determine whether/how to snap False do not snap Point(w,h) snap to rectangular grid with spacing (w,h) True snap using self.snapSize (and ignoring self.translateSnap) =============== ========================================================================== Also accepts *update* and *finish* arguments (see setPos() for a description of these). """ if len(args) == 1: pt = args[0] else: pt = args newState = self.stateCopy() newState['pos'] = newState['pos'] + pt snap = kargs.get('snap', None) if snap is None: snap = self.translateSnap if snap is not False: newState['pos'] = self.getSnapPosition(newState['pos'], snap=snap) if self.maxBounds is not None: r = self.stateRect(newState) d = Point(0,0) if self.maxBounds.left() > r.left(): d[0] = self.maxBounds.left() - r.left() elif self.maxBounds.right() < r.right(): d[0] = self.maxBounds.right() - r.right() if self.maxBounds.top() > r.top(): d[1] = self.maxBounds.top() - r.top() elif self.maxBounds.bottom() < r.bottom(): d[1] = self.maxBounds.bottom() - r.bottom() newState['pos'] += d update = kargs.get('update', True) finish = kargs.get('finish', True) self.setPos(newState['pos'], update=update, finish=finish)
[docs] def rotate(self, angle, center=None, snap=False, update=True, finish=True): """ Rotate the ROI by *angle* degrees. =============== ========================================================================== **Arguments** angle (float) The angle in degrees to rotate center (None | Point) Optional center point around which the ROI is rotated, in the local coordinate system of the ROI snap (bool) If True, the final ROI angle is snapped to the nearest increment (default is 15 degrees; see ROI.rotateSnapAngle) update (bool) See setPos() finish (bool) See setPos() =============== ========================================================================== """ self.setAngle(self.angle()+angle, center=center, snap=snap, update=update, finish=finish)
def handleMoveStarted(self): self.preMoveState = self.getState() self.sigRegionChangeStarted.emit(self)
[docs] def addTranslateHandle(self, pos, axes=None, item=None, name=None, index=None): """ Add a new translation handle to the ROI. Dragging the handle will move the entire ROI without changing its angle or shape. Note that, by default, ROIs may be moved by dragging anywhere inside the ROI. However, for larger ROIs it may be desirable to disable this and instead provide one or more translation handles. =================== ==================================================== **Arguments** pos (length-2 sequence) The position of the handle relative to the shape of the ROI. A value of (0,0) indicates the origin, whereas (1, 1) indicates the upper-right corner, regardless of the ROI's size. item The Handle instance to add. If None, a new handle will be created. name The name of this handle (optional). Handles are identified by name when calling getLocalHandlePositions and getSceneHandlePositions. =================== ==================================================== """ pos = Point(pos) return self.addHandle({'name': name, 'type': 't', 'pos': pos, 'item': item}, index=index)
[docs] def addFreeHandle(self, pos=None, axes=None, item=None, name=None, index=None): """ Add a new free handle to the ROI. Dragging free handles has no effect on the position or shape of the ROI. =================== ==================================================== **Arguments** pos (length-2 sequence) The position of the handle relative to the shape of the ROI. A value of (0,0) indicates the origin, whereas (1, 1) indicates the upper-right corner, regardless of the ROI's size. item The Handle instance to add. If None, a new handle will be created. name The name of this handle (optional). Handles are identified by name when calling getLocalHandlePositions and getSceneHandlePositions. =================== ==================================================== """ if pos is not None: pos = Point(pos) return self.addHandle({'name': name, 'type': 'f', 'pos': pos, 'item': item}, index=index)
[docs] def addScaleHandle(self, pos, center, axes=None, item=None, name=None, lockAspect=False, index=None): """ Add a new scale handle to the ROI. Dragging a scale handle allows the user to change the height and/or width of the ROI. =================== ==================================================== **Arguments** pos (length-2 sequence) The position of the handle relative to the shape of the ROI. A value of (0,0) indicates the origin, whereas (1, 1) indicates the upper-right corner, regardless of the ROI's size. center (length-2 sequence) The center point around which scaling takes place. If the center point has the same x or y value as the handle position, then scaling will be disabled for that axis. item The Handle instance to add. If None, a new handle will be created. name The name of this handle (optional). Handles are identified by name when calling getLocalHandlePositions and getSceneHandlePositions. =================== ==================================================== """ pos = Point(pos) center = Point(center) info = {'name': name, 'type': 's', 'center': center, 'pos': pos, 'item': item, 'lockAspect': lockAspect} if pos.x() == center.x(): info['xoff'] = True if pos.y() == center.y(): info['yoff'] = True return self.addHandle(info, index=index)
[docs] def addRotateHandle(self, pos, center, item=None, name=None, index=None): """ Add a new rotation handle to the ROI. Dragging a rotation handle allows the user to change the angle of the ROI. =================== ==================================================== **Arguments** pos (length-2 sequence) The position of the handle relative to the shape of the ROI. A value of (0,0) indicates the origin, whereas (1, 1) indicates the upper-right corner, regardless of the ROI's size. center (length-2 sequence) The center point around which rotation takes place. item The Handle instance to add. If None, a new handle will be created. name The name of this handle (optional). Handles are identified by name when calling getLocalHandlePositions and getSceneHandlePositions. =================== ==================================================== """ pos = Point(pos) center = Point(center) return self.addHandle({'name': name, 'type': 'r', 'center': center, 'pos': pos, 'item': item}, index=index)
[docs] def addScaleRotateHandle(self, pos, center, item=None, name=None, index=None): """ Add a new scale+rotation handle to the ROI. When dragging a handle of this type, the user can simultaneously rotate the ROI around an arbitrary center point as well as scale the ROI by dragging the handle toward or away from the center point. =================== ==================================================== **Arguments** pos (length-2 sequence) The position of the handle relative to the shape of the ROI. A value of (0,0) indicates the origin, whereas (1, 1) indicates the upper-right corner, regardless of the ROI's size. center (length-2 sequence) The center point around which scaling and rotation take place. item The Handle instance to add. If None, a new handle will be created. name The name of this handle (optional). Handles are identified by name when calling getLocalHandlePositions and getSceneHandlePositions. =================== ==================================================== """ pos = Point(pos) center = Point(center) if pos[0] == center[0] and pos[1] == center[1]: raise Exception("Scale/rotate handles cannot be at their center point.") return self.addHandle({'name': name, 'type': 'sr', 'center': center, 'pos': pos, 'item': item}, index=index)
[docs] def addRotateFreeHandle(self, pos, center, axes=None, item=None, name=None, index=None): """ Add a new rotation+free handle to the ROI. When dragging a handle of this type, the user can rotate the ROI around an arbitrary center point, while moving toward or away from the center point has no effect on the shape of the ROI. =================== ==================================================== **Arguments** pos (length-2 sequence) The position of the handle relative to the shape of the ROI. A value of (0,0) indicates the origin, whereas (1, 1) indicates the upper-right corner, regardless of the ROI's size. center (length-2 sequence) The center point around which rotation takes place. item The Handle instance to add. If None, a new handle will be created. name The name of this handle (optional). Handles are identified by name when calling getLocalHandlePositions and getSceneHandlePositions. =================== ==================================================== """ pos = Point(pos) center = Point(center) return self.addHandle({'name': name, 'type': 'rf', 'center': center, 'pos': pos, 'item': item}, index=index)
def addHandle(self, info, index=None): ## If a Handle was not supplied, create it now if 'item' not in info or info['item'] is None: h = Handle(self.handleSize, typ=info['type'], pen=self.handlePen, hoverPen=self.handleHoverPen, parent=self) info['item'] = h else: h = info['item'] if info['pos'] is None: info['pos'] = h.pos() h.setPos(info['pos'] * self.state['size']) ## connect the handle to this ROI #iid = len(self.handles) h.connectROI(self) if index is None: self.handles.append(info) else: self.handles.insert(index, info) h.setZValue(self.zValue()+1) self.stateChanged() return h
[docs] def indexOfHandle(self, handle): """ Return the index of *handle* in the list of this ROI's handles. """ if isinstance(handle, Handle): index = [i for i, info in enumerate(self.handles) if info['item'] is handle] if len(index) == 0: raise Exception("Cannot return handle index; not attached to this ROI") return index[0] else: return handle
[docs] def removeHandle(self, handle): """Remove a handle from this ROI. Argument may be either a Handle instance or the integer index of the handle.""" index = self.indexOfHandle(handle) handle = self.handles[index]['item'] self.handles.pop(index) handle.disconnectROI(self) if len(handle.rois) == 0 and self.scene() is not None: self.scene().removeItem(handle) self.stateChanged()
[docs] def replaceHandle(self, oldHandle, newHandle): """Replace one handle in the ROI for another. This is useful when connecting multiple ROIs together. *oldHandle* may be a Handle instance or the index of a handle to be replaced.""" index = self.indexOfHandle(oldHandle) info = self.handles[index] self.removeHandle(index) info['item'] = newHandle info['pos'] = newHandle.pos() self.addHandle(info, index=index)
def checkRemoveHandle(self, handle): ## This is used when displaying a Handle's context menu to determine ## whether removing is allowed. ## Subclasses may wish to override this to disable the menu entry. ## Note: by default, handles are not user-removable even if this method returns True. return True
[docs] def getLocalHandlePositions(self, index=None): """Returns the position of handles in the ROI's coordinate system. The format returned is a list of (name, pos) tuples. """ if index is None: positions = [] for h in self.handles: positions.append((h['name'], h['pos'])) return positions else: return (self.handles[index]['name'], self.handles[index]['pos'])
[docs] def getSceneHandlePositions(self, index=None): """Returns the position of handles in the scene coordinate system. The format returned is a list of (name, pos) tuples. """ if index is None: positions = [] for h in self.handles: positions.append((h['name'], h['item'].scenePos())) return positions else: return (self.handles[index]['name'], self.handles[index]['item'].scenePos())
[docs] def getHandles(self): """ Return a list of this ROI's Handles. """ return [h['item'] for h in self.handles]
def mapSceneToParent(self, pt): return self.mapToParent(self.mapFromScene(pt)) def setSelected(self, s): QtWidgets.QGraphicsItem.setSelected(self, s) #print "select", self, s if s: for h in self.handles: h['item'].show() else: for h in self.handles: h['item'].hide() def hoverEvent(self, ev): hover = False if not ev.isExit(): if self.translatable and ev.acceptDrags(QtCore.Qt.MouseButton.LeftButton): hover=True for btn in [QtCore.Qt.MouseButton.LeftButton, QtCore.Qt.MouseButton.RightButton, QtCore.Qt.MouseButton.MiddleButton]: if (self.acceptedMouseButtons() & btn) and ev.acceptClicks(btn): hover=True if self.contextMenuEnabled(): ev.acceptClicks(QtCore.Qt.MouseButton.RightButton) if hover: self.setMouseHover(True) ev.acceptClicks(QtCore.Qt.MouseButton.LeftButton) ## If the ROI is hilighted, we should accept all clicks to avoid confusion. ev.acceptClicks(QtCore.Qt.MouseButton.RightButton) ev.acceptClicks(QtCore.Qt.MouseButton.MiddleButton) self.sigHoverEvent.emit(self) else: self.setMouseHover(False) def setMouseHover(self, hover): ## Inform the ROI that the mouse is(not) hovering over it if self.mouseHovering == hover: return self.mouseHovering = hover self._updateHoverColor() def _updateHoverColor(self): pen = self._makePen() if self.currentPen != pen: self.currentPen = pen self.update() def _makePen(self): # Generate the pen color for this ROI based on its current state. if self.mouseHovering: return self.hoverPen else: return self.pen def contextMenuEnabled(self): return self.removable def raiseContextMenu(self, ev): if not self.contextMenuEnabled(): return menu = self.getMenu() menu = self.scene().addParentContextMenus(self, menu, ev) pos = ev.screenPos() menu.popup(QtCore.QPoint(int(pos.x()), int(pos.y()))) def getMenu(self): if self.menu is None: self.menu = QtWidgets.QMenu() self.menu.setTitle(translate("ROI", "ROI")) remAct = QtGui.QAction(translate("ROI", "Remove ROI"), self.menu) remAct.triggered.connect(self.removeClicked) self.menu.addAction(remAct) self.menu.remAct = remAct # ROI menu may be requested when showing the handle context menu, so # return the menu but disable it if the ROI isn't removable self.menu.setEnabled(self.contextMenuEnabled()) return self.menu def removeClicked(self): ## Send remove event only after we have exited the menu event handler QtCore.QTimer.singleShot(0, self._emitRemoveRequest) def _emitRemoveRequest(self): self.sigRemoveRequested.emit(self) def mouseDragEvent(self, ev): self.mouseDragHandler.mouseDragEvent(ev) def mouseClickEvent(self, ev): if ev.button() == QtCore.Qt.MouseButton.RightButton and self.isMoving: ev.accept() self.cancelMove() if ev.button() == QtCore.Qt.MouseButton.RightButton and self.contextMenuEnabled(): self.raiseContextMenu(ev) ev.accept() elif self.acceptedMouseButtons() & ev.button(): ev.accept() self.sigClicked.emit(self, ev) else: ev.ignore() def _moveStarted(self): self.isMoving = True self.preMoveState = self.getState() self.sigRegionChangeStarted.emit(self) def _moveFinished(self): if self.isMoving: self.stateChangeFinished() self.isMoving = False def cancelMove(self): self.isMoving = False self.setState(self.preMoveState)
[docs] def checkPointMove(self, handle, pos, modifiers): """When handles move, they must ask the ROI if the move is acceptable. By default, this always returns True. Subclasses may wish override. """ return True
def movePoint(self, handle, pos, modifiers=None, finish=True, coords='parent'): ## called by Handles when they are moved. ## pos is the new position of the handle in scene coords, as requested by the handle. if modifiers is None: modifiers = QtCore.Qt.KeyboardModifier.NoModifier newState = self.stateCopy() index = self.indexOfHandle(handle) h = self.handles[index] p0 = self.mapToParent(h['pos'] * self.state['size']) p1 = Point(pos) if coords == 'parent': pass elif coords == 'scene': p1 = self.mapSceneToParent(p1) else: raise Exception("New point location must be given in either 'parent' or 'scene' coordinates.") ## Handles with a 'center' need to know their local position relative to the center point (lp0, lp1) if 'center' in h: c = h['center'] cs = c * self.state['size'] lp0 = self.mapFromParent(p0) - cs lp1 = self.mapFromParent(p1) - cs if h['type'] == 't': snap = True if (modifiers & QtCore.Qt.KeyboardModifier.ControlModifier) else None self.translate(p1-p0, snap=snap, update=False) elif h['type'] == 'f': newPos = self.mapFromParent(p1) h['item'].setPos(newPos) h['pos'] = newPos self.freeHandleMoved = True elif h['type'] == 's': ## If a handle and its center have the same x or y value, we can't scale across that axis. if h['center'][0] == h['pos'][0]: lp1[0] = 0 if h['center'][1] == h['pos'][1]: lp1[1] = 0 ## snap if self.scaleSnap or (modifiers & QtCore.Qt.KeyboardModifier.ControlModifier): lp1[0] = round(lp1[0] / self.scaleSnapSize) * self.scaleSnapSize lp1[1] = round(lp1[1] / self.scaleSnapSize) * self.scaleSnapSize ## preserve aspect ratio (this can override snapping) if h['lockAspect'] or (modifiers & QtCore.Qt.KeyboardModifier.AltModifier): #arv = Point(self.preMoveState['size']) - lp1 = lp1.proj(lp0) ## determine scale factors and new size of ROI hs = h['pos'] - c if hs[0] == 0: hs[0] = 1 if hs[1] == 0: hs[1] = 1 newSize = lp1 / hs ## Perform some corrections and limit checks if newSize[0] == 0: newSize[0] = newState['size'][0] if newSize[1] == 0: newSize[1] = newState['size'][1] if not self.invertible: if newSize[0] < 0: newSize[0] = newState['size'][0] if newSize[1] < 0: newSize[1] = newState['size'][1] if self.aspectLocked: newSize[0] = newSize[1] ## Move ROI so the center point occupies the same scene location after the scale s0 = c * self.state['size'] s1 = c * newSize cc = self.mapToParent(s0 - s1) - self.mapToParent(Point(0, 0)) ## update state, do more boundary checks newState['size'] = newSize newState['pos'] = newState['pos'] + cc if self.maxBounds is not None: r = self.stateRect(newState) if not self.maxBounds.contains(r): return self.setPos(newState['pos'], update=False) self.setSize(newState['size'], update=False) elif h['type'] in ['r', 'rf']: if h['type'] == 'rf': self.freeHandleMoved = True if not self.rotatable: return ## If the handle is directly over its center point, we can't compute an angle. try: if lp1.length() == 0 or lp0.length() == 0: return except OverflowError: return ## determine new rotation angle, constrained if necessary ang = newState['angle'] - lp0.angle(lp1) if ang is None: ## this should never happen.. return if self.rotateSnap or (modifiers & QtCore.Qt.KeyboardModifier.ControlModifier): ang = round(ang / self.rotateSnapAngle) * self.rotateSnapAngle ## create rotation transform tr = QtGui.QTransform() tr.rotate(ang) ## move ROI so that center point remains stationary after rotate cc = self.mapToParent(cs) - (tr.map(cs) + self.state['pos']) newState['angle'] = ang newState['pos'] = newState['pos'] + cc ## check boundaries, update if self.maxBounds is not None: r = self.stateRect(newState) if not self.maxBounds.contains(r): return self.setPos(newState['pos'], update=False) self.setAngle(ang, update=False) ## If this is a free-rotate handle, its distance from the center may change. if h['type'] == 'rf': h['item'].setPos(self.mapFromScene(p1)) ## changes ROI coordinates of handle h['pos'] = self.mapFromParent(p1) elif h['type'] == 'sr': try: if lp1.length() == 0 or lp0.length() == 0: return except OverflowError: return ang = newState['angle'] - lp0.angle(lp1) if ang is None: return if self.rotateSnap or (modifiers & QtCore.Qt.KeyboardModifier.ControlModifier): ang = round(ang / self.rotateSnapAngle) * self.rotateSnapAngle if self.aspectLocked or h['center'][0] != h['pos'][0]: newState['size'][0] = self.state['size'][0] * lp1.length() / lp0.length() if self.scaleSnap: # use CTRL only for angular snap here. newState['size'][0] = round(newState['size'][0] / self.snapSize) * self.snapSize if self.aspectLocked or h['center'][1] != h['pos'][1]: newState['size'][1] = self.state['size'][1] * lp1.length() / lp0.length() if self.scaleSnap: # use CTRL only for angular snap here. newState['size'][1] = round(newState['size'][1] / self.snapSize) * self.snapSize if newState['size'][0] == 0: newState['size'][0] = 1 if newState['size'][1] == 0: newState['size'][1] = 1 c1 = c * newState['size'] tr = QtGui.QTransform() tr.rotate(ang) cc = self.mapToParent(cs) - (tr.map(c1) + self.state['pos']) newState['angle'] = ang newState['pos'] = newState['pos'] + cc if self.maxBounds is not None: r = self.stateRect(newState) if not self.maxBounds.contains(r): return self.setState(newState, update=False) self.stateChanged(finish=finish)
[docs] def stateChanged(self, finish=True): """Process changes to the state of the ROI. If there are any changes, then the positions of handles are updated accordingly and sigRegionChanged is emitted. If finish is True, then sigRegionChangeFinished will also be emitted.""" changed = False if self.lastState is None: changed = True else: state = self.getState() for k in list(state.keys()): if state[k] != self.lastState[k]: changed = True self.prepareGeometryChange() if changed: ## Move all handles to match the current configuration of the ROI for h in self.handles: if h['item'] in self.childItems(): h['item'].setPos(h['pos'] * self.state['size']) self.update() self.sigRegionChanged.emit(self) elif self.freeHandleMoved: self.sigRegionChanged.emit(self) self.freeHandleMoved = False self.lastState = self.getState() if finish: self.stateChangeFinished() self.informViewBoundsChanged()
def stateChangeFinished(self): self.sigRegionChangeFinished.emit(self) def stateRect(self, state): r = QtCore.QRectF(0, 0, state['size'][0], state['size'][1]) tr = QtGui.QTransform() tr.rotate(-state['angle']) r = tr.mapRect(r) return r.adjusted(state['pos'][0], state['pos'][1], state['pos'][0], state['pos'][1]) def getSnapPosition(self, pos, snap=None): ## Given that pos has been requested, return the nearest snap-to position ## optionally, snap may be passed in to specify a rectangular snap grid. ## override this function for more interesting snap functionality.. if snap is None or snap is True: if self.snapSize is None: return pos snap = Point(self.snapSize, self.snapSize) return Point( round(pos[0] / snap[0]) * snap[0], round(pos[1] / snap[1]) * snap[1] ) def boundingRect(self): return QtCore.QRectF(0, 0, self.state['size'][0], self.state['size'][1]).normalized() def paint(self, p, opt, widget): # Note: don't use self.boundingRect here, because subclasses may need to redefine it. r = QtCore.QRectF(0, 0, self.state['size'][0], self.state['size'][1]).normalized() p.setRenderHint(QtGui.QPainter.RenderHint.Antialiasing) p.setPen(self.currentPen) p.translate(r.left(), r.top()) p.scale(r.width(), r.height()) p.drawRect(0, 0, 1, 1)
[docs] def getArraySlice(self, data, img, axes=(0,1), returnSlice=True): """Return a tuple of slice objects that can be used to slice the region from *data* that is covered by the bounding rectangle of this ROI. Also returns the transform that maps the ROI into data coordinates. If returnSlice is set to False, the function returns a pair of tuples with the values that would have been used to generate the slice objects. ((ax0Start, ax0Stop), (ax1Start, ax1Stop)) If the slice cannot be computed (usually because the scene/transforms are not properly constructed yet), then the method returns None. """ ## Determine shape of array along ROI axes dShape = (data.shape[axes[0]], data.shape[axes[1]]) ## Determine transform that maps ROI bounding box to image coordinates try: tr = self.sceneTransform() * fn.invertQTransform(img.sceneTransform()) except np.linalg.linalg.LinAlgError: return None ## Modify transform to scale from image coords to data coords axisOrder = img.axisOrder if axisOrder == 'row-major': tr.scale(float(dShape[1]) / img.width(), float(dShape[0]) / img.height()) else: tr.scale(float(dShape[0]) / img.width(), float(dShape[1]) / img.height()) ## Transform ROI bounds into data bounds dataBounds = tr.mapRect(self.boundingRect()) ## Intersect transformed ROI bounds with data bounds if axisOrder == 'row-major': intBounds = dataBounds.intersected(QtCore.QRectF(0, 0, dShape[1], dShape[0])) else: intBounds = dataBounds.intersected(QtCore.QRectF(0, 0, dShape[0], dShape[1])) ## Determine index values to use when referencing the array. bounds = ( (int(min(intBounds.left(), intBounds.right())), int(1+max(intBounds.left(), intBounds.right()))), (int(min(intBounds.bottom(), intBounds.top())), int(1+max(intBounds.bottom(), intBounds.top()))) ) if axisOrder == 'row-major': bounds = bounds[::-1] if returnSlice: ## Create slice objects sl = [slice(None)] * data.ndim sl[axes[0]] = slice(*bounds[0]) sl[axes[1]] = slice(*bounds[1]) return tuple(sl), tr else: return bounds, tr
[docs] def getArrayRegion(self, data, img, axes=(0,1), returnMappedCoords=False, **kwds): r"""Use the position and orientation of this ROI relative to an imageItem to pull a slice from an array. =================== ==================================================== **Arguments** data The array to slice from. Note that this array does *not* have to be the same data that is represented in *img*. img (ImageItem or other suitable QGraphicsItem) Used to determine the relationship between the ROI and the boundaries of *data*. axes (length-2 tuple) Specifies the axes in *data* that correspond to the (x, y) axes of *img*. If the image's axis order is set to 'row-major', then the axes are instead specified in (y, x) order. returnMappedCoords (bool) If True, the array slice is returned along with a corresponding array of coordinates that were used to extract data from the original array. \**kwds All keyword arguments are passed to :func:`affineSlice <pyqtgraph.affineSlice>`. =================== ==================================================== This method uses :func:`affineSlice <pyqtgraph.affineSlice>` to generate the slice from *data* and uses :func:`getAffineSliceParams <pyqtgraph.ROI.getAffineSliceParams>` to determine the parameters to pass to :func:`affineSlice <pyqtgraph.affineSlice>`. If *returnMappedCoords* is True, then the method returns a tuple (result, coords) such that coords is the set of coordinates used to interpolate values from the original data, mapped into the parent coordinate system of the image. This is useful, when slicing data from images that have been transformed, for determining the location of each value in the sliced data. All extra keyword arguments are passed to :func:`affineSlice <pyqtgraph.affineSlice>`. """ # this is a hidden argument for internal use fromBR = kwds.pop('fromBoundingRect', False) # Automaticaly compute missing parameters _shape, _vectors, _origin = self.getAffineSliceParams(data, img, axes, fromBoundingRect=fromBR) # Replace them with user defined parameters if defined shape = kwds.pop('shape', _shape) vectors = kwds.pop('vectors', _vectors) origin = kwds.pop('origin', _origin) if not returnMappedCoords: rgn = fn.affineSlice(data, shape=shape, vectors=vectors, origin=origin, axes=axes, **kwds) return rgn else: kwds['returnCoords'] = True result, coords = fn.affineSlice(data, shape=shape, vectors=vectors, origin=origin, axes=axes, **kwds) ### map coordinates and return mapped = fn.transformCoordinates(img.transform(), coords) return result, mapped
def _getArrayRegionForArbitraryShape(self, data, img, axes=(0,1), returnMappedCoords=False, **kwds): """ Return the result of :meth:`~pyqtgraph.ROI.getArrayRegion`, masked by the shape of the ROI. Values outside the ROI shape are set to 0. See :meth:`~pyqtgraph.ROI.getArrayRegion` for a description of the arguments. """ if returnMappedCoords: sliced, mappedCoords = ROI.getArrayRegion( self, data, img, axes, returnMappedCoords, fromBoundingRect=True, **kwds) else: sliced = ROI.getArrayRegion( self, data, img, axes, returnMappedCoords, fromBoundingRect=True, **kwds) if img.axisOrder == 'col-major': mask = self.renderShapeMask(sliced.shape[axes[0]], sliced.shape[axes[1]]) else: mask = self.renderShapeMask(sliced.shape[axes[1]], sliced.shape[axes[0]]) mask = mask.T # reshape mask to ensure it is applied to the correct data axes shape = [1] * data.ndim shape[axes[0]] = sliced.shape[axes[0]] shape[axes[1]] = sliced.shape[axes[1]] mask = mask.reshape(shape) if returnMappedCoords: return sliced * mask, mappedCoords else: return sliced * mask
[docs] def getAffineSliceParams(self, data, img, axes=(0,1), fromBoundingRect=False): """ Returns the parameters needed to use :func:`affineSlice <pyqtgraph.affineSlice>` (shape, vectors, origin) to extract a subset of *data* using this ROI and *img* to specify the subset. If *fromBoundingRect* is True, then the ROI's bounding rectangle is used rather than the shape of the ROI. See :func:`getArrayRegion <pyqtgraph.ROI.getArrayRegion>` for more information. """ if self.scene() is not img.scene(): raise Exception("ROI and target item must be members of the same scene.") origin = img.mapToData(self.mapToItem(img, QtCore.QPointF(0, 0))) ## vx and vy point in the directions of the slice axes, but must be scaled properly vx = img.mapToData(self.mapToItem(img, QtCore.QPointF(1, 0))) - origin vy = img.mapToData(self.mapToItem(img, QtCore.QPointF(0, 1))) - origin lvx = hypot(vx.x(), vx.y()) # length lvy = hypot(vy.x(), vy.y()) # length ##img.width is number of pixels, not width of item. ##need pxWidth and pxHeight instead of pxLen ? sx = 1.0 / lvx sy = 1.0 / lvy vectors = ((vx.x()*sx, vx.y()*sx), (vy.x()*sy, vy.y()*sy)) if fromBoundingRect is True: shape = self.boundingRect().width(), self.boundingRect().height() origin = img.mapToData(self.mapToItem(img, self.boundingRect().topLeft())) origin = (origin.x(), origin.y()) else: shape = self.state['size'] origin = (origin.x(), origin.y()) shape = [abs(shape[0]/sx), abs(shape[1]/sy)] if img.axisOrder == 'row-major': # transpose output vectors = vectors[::-1] shape = shape[::-1] return shape, vectors, origin
[docs] def renderShapeMask(self, width, height): """Return an array of 0.0-1.0 into which the shape of the item has been drawn. This can be used to mask array selections. """ if width == 0 or height == 0: return np.empty((width, height), dtype=float) im = QtGui.QImage(width, height, QtGui.QImage.Format.Format_ARGB32) im.fill(QtCore.Qt.GlobalColor.transparent) p = QtGui.QPainter(im) p.setPen(fn.mkPen(None)) p.setBrush(fn.mkBrush('w')) shape = self.shape() bounds = shape.boundingRect() p.scale(im.width() / bounds.width(), im.height() / bounds.height()) p.translate(-bounds.topLeft()) p.drawPath(shape) p.end() cidx = 0 if sys.byteorder == 'little' else 3 mask = fn.ndarray_from_qimage(im)[...,cidx].T return mask.astype(float) / 255
[docs] def getGlobalTransform(self, relativeTo=None): """Return global transformation (rotation angle+translation) required to move from relative state to current state. If relative state isn't specified, then we use the state of the ROI when mouse is pressed.""" if relativeTo is None: relativeTo = self.preMoveState st = self.getState() ## this is only allowed because we will be comparing the two relativeTo['scale'] = relativeTo['size'] st['scale'] = st['size'] t1 = SRTTransform(relativeTo) t2 = SRTTransform(st) return t2/t1
def applyGlobalTransform(self, tr): st = self.getState() st['scale'] = st['size'] st = SRTTransform(st) st = (st * tr).saveState() st['size'] = st['scale'] self.setState(st)
class Handle(UIGraphicsItem): """ Handle represents a single user-interactable point attached to an ROI. They are usually created by a call to one of the ROI.add___Handle() methods. Handles are represented as a square, diamond, or circle, and are drawn with fixed pixel size regardless of the scaling of the view they are displayed in. Handles may be dragged to change the position, size, orientation, or other properties of the ROI they are attached to. """ types = { ## defines number of sides, start angle for each handle type 't': (4, np.pi/4), 'f': (4, np.pi/4), 's': (4, 0), 'r': (12, 0), 'sr': (12, 0), 'rf': (12, 0), } sigClicked = QtCore.Signal(object, object) # self, event sigRemoveRequested = QtCore.Signal(object) # self def __init__(self, radius, typ=None, pen=(200, 200, 220), hoverPen=(255, 255, 0), parent=None, deletable=False): self.rois = [] self.radius = radius self.typ = typ self.pen = fn.mkPen(pen) self.hoverPen = fn.mkPen(hoverPen) self.currentPen = self.pen self.pen.setWidth(0) self.pen.setCosmetic(True) self.isMoving = False self.sides, self.startAng = self.types[typ] self.buildPath() self._shape = None self.menu = self.buildMenu() UIGraphicsItem.__init__(self, parent=parent) self.setAcceptedMouseButtons(QtCore.Qt.MouseButton.NoButton) self.deletable = deletable if deletable: self.setAcceptedMouseButtons(QtCore.Qt.MouseButton.RightButton) self.setZValue(11) def connectROI(self, roi): ### roi is the "parent" roi, i is the index of the handle in roi.handles self.rois.append(roi) def disconnectROI(self, roi): self.rois.remove(roi) def setDeletable(self, b): self.deletable = b if b: self.setAcceptedMouseButtons(self.acceptedMouseButtons() | QtCore.Qt.MouseButton.RightButton) else: self.setAcceptedMouseButtons(self.acceptedMouseButtons() & ~QtCore.Qt.MouseButton.RightButton) def removeClicked(self): self.sigRemoveRequested.emit(self) def hoverEvent(self, ev): hover = False if not ev.isExit(): if ev.acceptDrags(QtCore.Qt.MouseButton.LeftButton): hover=True for btn in [QtCore.Qt.MouseButton.LeftButton, QtCore.Qt.MouseButton.RightButton, QtCore.Qt.MouseButton.MiddleButton]: if (self.acceptedMouseButtons() & btn) and ev.acceptClicks(btn): hover=True if hover: self.currentPen = self.hoverPen else: self.currentPen = self.pen self.update() def mouseClickEvent(self, ev): ## right-click cancels drag if ev.button() == QtCore.Qt.MouseButton.RightButton and self.isMoving: self.isMoving = False ## prevents any further motion self.movePoint(self.startPos, finish=True) ev.accept() elif self.acceptedMouseButtons() & ev.button(): ev.accept() if ev.button() == QtCore.Qt.MouseButton.RightButton and self.deletable: self.raiseContextMenu(ev) self.sigClicked.emit(self, ev) else: ev.ignore() def buildMenu(self): menu = QtWidgets.QMenu() menu.setTitle(translate("ROI", "Handle")) self.removeAction = menu.addAction(translate("ROI", "Remove handle"), self.removeClicked) return menu def getMenu(self): return self.menu def raiseContextMenu(self, ev): menu = self.scene().addParentContextMenus(self, self.getMenu(), ev) ## Make sure it is still ok to remove this handle removeAllowed = all(r.checkRemoveHandle(self) for r in self.rois) self.removeAction.setEnabled(removeAllowed) pos = ev.screenPos() menu.popup(QtCore.QPoint(int(pos.x()), int(pos.y()))) def mouseDragEvent(self, ev): if ev.button() != QtCore.Qt.MouseButton.LeftButton: return ev.accept() ## Inform ROIs that a drag is happening ## note: the ROI is informed that the handle has moved using ROI.movePoint ## this is for other (more nefarious) purposes. #for r in self.roi: #r[0].pointDragEvent(r[1], ev) if ev.isFinish(): if self.isMoving: for r in self.rois: r.stateChangeFinished() self.isMoving = False self.currentPen = self.pen self.update() elif ev.isStart(): for r in self.rois: r.handleMoveStarted() self.isMoving = True self.startPos = self.scenePos() self.cursorOffset = self.scenePos() - ev.buttonDownScenePos() self.currentPen = self.hoverPen if self.isMoving: ## note: isMoving may become False in mid-drag due to right-click. pos = ev.scenePos() + self.cursorOffset self.currentPen = self.hoverPen self.movePoint(pos, ev.modifiers(), finish=False) def movePoint(self, pos, modifiers=None, finish=True): if modifiers is None: modifiers = QtCore.Qt.KeyboardModifier.NoModifier for r in self.rois: if not r.checkPointMove(self, pos, modifiers): return #print "point moved; inform %d ROIs" % len(self.roi) # A handle can be used by multiple ROIs; tell each to update its handle position for r in self.rois: r.movePoint(self, pos, modifiers, finish=finish, coords='scene') def buildPath(self): size = self.radius self.path = QtGui.QPainterPath() ang = self.startAng dt = 2 * np.pi / self.sides for i in range(0, self.sides+1): x = size * cos(ang) y = size * sin(ang) ang += dt if i == 0: self.path.moveTo(x, y) else: self.path.lineTo(x, y) def paint(self, p, opt, widget): p.setRenderHints(p.RenderHint.Antialiasing, True) p.setPen(self.currentPen) p.drawPath(self.shape()) def shape(self): if self._shape is None: s = self.generateShape() if s is None: return self.path self._shape = s self.prepareGeometryChange() ## beware--this can cause the view to adjust, which would immediately invalidate the shape. return self._shape def boundingRect(self): s1 = self.shape() # noqa: avoid problems with shape invalidation return self.shape().boundingRect() def generateShape(self): dt = self.deviceTransform() if dt is None: self._shape = self.path return None v = dt.map(QtCore.QPointF(1, 0)) - dt.map(QtCore.QPointF(0, 0)) va = atan2(v.y(), v.x()) dti = fn.invertQTransform(dt) devPos = dt.map(QtCore.QPointF(0,0)) tr = QtGui.QTransform() tr.translate(devPos.x(), devPos.y()) tr.rotateRadians(va) return dti.map(tr.map(self.path)) def viewTransformChanged(self): GraphicsObject.viewTransformChanged(self) self._shape = None ## invalidate shape, recompute later if requested. self.update() class MouseDragHandler(object): """Implements default mouse drag behavior for ROI (not for ROI handles). """ def __init__(self, roi): self.roi = roi self.dragMode = None self.startState = None self.snapModifier = QtCore.Qt.KeyboardModifier.ControlModifier self.translateModifier = QtCore.Qt.KeyboardModifier.NoModifier self.rotateModifier = QtCore.Qt.KeyboardModifier.AltModifier self.scaleModifier = QtCore.Qt.KeyboardModifier.ShiftModifier self.rotateSpeed = 0.5 self.scaleSpeed = 1.01 def mouseDragEvent(self, ev): roi = self.roi if ev.isStart(): if ev.button() == QtCore.Qt.MouseButton.LeftButton: roi.setSelected(True) mods = ev.modifiers() & ~self.snapModifier if roi.translatable and mods == self.translateModifier: self.dragMode = 'translate' elif roi.rotatable and mods == self.rotateModifier: self.dragMode = 'rotate' elif roi.resizable and mods == self.scaleModifier: self.dragMode = 'scale' else: self.dragMode = None if self.dragMode is not None: roi._moveStarted() self.startPos = roi.mapToParent(ev.buttonDownPos()) self.startState = roi.saveState() self.cursorOffset = roi.pos() - self.startPos ev.accept() else: ev.ignore() else: self.dragMode = None ev.ignore() if ev.isFinish() and self.dragMode is not None: roi._moveFinished() return # roi.isMoving becomes False if the move was cancelled by right-click if not roi.isMoving or self.dragMode is None: return snap = True if (ev.modifiers() & self.snapModifier) else None pos = roi.mapToParent(ev.pos()) if self.dragMode == 'translate': newPos = pos + self.cursorOffset roi.translate(newPos - roi.pos(), snap=snap, finish=False) elif self.dragMode == 'rotate': diff = self.rotateSpeed * (ev.scenePos() - ev.buttonDownScenePos()).x() angle = self.startState['angle'] - diff roi.setAngle(angle, centerLocal=ev.buttonDownPos(), snap=snap, finish=False) elif self.dragMode == 'scale': diff = self.scaleSpeed ** -(ev.scenePos() - ev.buttonDownScenePos()).y() roi.setSize(Point(self.startState['size']) * diff, centerLocal=ev.buttonDownPos(), snap=snap, finish=False) class TestROI(ROI): def __init__(self, pos, size, **args): ROI.__init__(self, pos, size, **args) self.addTranslateHandle([0.5, 0.5]) self.addScaleHandle([1, 1], [0, 0]) self.addScaleHandle([0, 0], [1, 1]) self.addScaleRotateHandle([1, 0.5], [0.5, 0.5]) self.addScaleHandle([0.5, 1], [0.5, 0.5]) self.addRotateHandle([1, 0], [0, 0]) self.addRotateHandle([0, 1], [1, 1])
[docs]class RectROI(ROI): r""" Rectangular ROI subclass with a single scale handle at the top-right corner. ============== ============================================================= **Arguments** pos (length-2 sequence) The position of the ROI origin. See ROI(). size (length-2 sequence) The size of the ROI. See ROI(). centered (bool) If True, scale handles affect the ROI relative to its center, rather than its origin. sideScalers (bool) If True, extra scale handles are added at the top and right edges. \**args All extra keyword arguments are passed to ROI() ============== ============================================================= """ def __init__(self, pos, size, centered=False, sideScalers=False, **args): ROI.__init__(self, pos, size, **args) if centered: center = [0.5, 0.5] else: center = [0, 0] self.addScaleHandle([1, 1], center) if sideScalers: self.addScaleHandle([1, 0.5], [center[0], 0.5]) self.addScaleHandle([0.5, 1], [0.5, center[1]])
[docs]class LineROI(ROI): r""" Rectangular ROI subclass with scale-rotate handles on either side. This allows the ROI to be positioned as if moving the ends of a line segment. A third handle controls the width of the ROI orthogonal to its "line" axis. ============== ============================================================= **Arguments** pos1 (length-2 sequence) The position of the center of the ROI's left edge. pos2 (length-2 sequence) The position of the center of the ROI's right edge. width (float) The width of the ROI. \**args All extra keyword arguments are passed to ROI() ============== ============================================================= """ def __init__(self, pos1, pos2, width, **args): pos1 = Point(pos1) pos2 = Point(pos2) d = pos2-pos1 l = d.length() ra = d.angle(Point(1, 0), units="radians") c = Point(width/2. * sin(ra), -width/2. * cos(ra)) pos1 = pos1 + c ROI.__init__(self, pos1, size=Point(l, width), angle=degrees(ra), **args) self.addScaleRotateHandle([0, 0.5], [1, 0.5]) self.addScaleRotateHandle([1, 0.5], [0, 0.5]) self.addScaleHandle([0.5, 1], [0.5, 0.5])
[docs]class MultiRectROI(QtWidgets.QGraphicsObject): r""" Chain of rectangular ROIs connected by handles. This is generally used to mark a curved path through an image similarly to PolyLineROI. It differs in that each segment of the chain is rectangular instead of linear and thus has width. ============== ============================================================= **Arguments** points (list of length-2 sequences) The list of points in the path. width (float) The width of the ROIs orthogonal to the path. \**args All extra keyword arguments are passed to ROI() ============== ============================================================= """ sigRegionChangeFinished = QtCore.Signal(object) sigRegionChangeStarted = QtCore.Signal(object) sigRegionChanged = QtCore.Signal(object) def __init__(self, points, width, pen=None, **args): QtWidgets.QGraphicsObject.__init__(self) self.pen = pen self.roiArgs = args self.lines = [] if len(points) < 2: raise Exception("Must start with at least 2 points") ## create first segment self.addSegment(points[1], connectTo=points[0], scaleHandle=True) ## create remaining segments for p in points[2:]: self.addSegment(p) def paint(self, *args): pass def boundingRect(self): return QtCore.QRectF() def roiChangedEvent(self): w = self.lines[0].state['size'][1] for l in self.lines[1:]: w0 = l.state['size'][1] if w == w0: continue l.scale([1.0, w/w0], center=[0.5,0.5]) self.sigRegionChanged.emit(self) def roiChangeStartedEvent(self): self.sigRegionChangeStarted.emit(self) def roiChangeFinishedEvent(self): self.sigRegionChangeFinished.emit(self)
[docs] def getHandlePositions(self): """Return the positions of all handles in local coordinates.""" pos = [self.mapFromScene(self.lines[0].getHandles()[0].scenePos())] for l in self.lines: pos.append(self.mapFromScene(l.getHandles()[1].scenePos())) return pos
[docs] def getArrayRegion(self, arr, img=None, axes=(0,1), **kwds): """ Return the result of :meth:`~pyqtgraph.ROI.getArrayRegion` for each rect in the chain concatenated into a single ndarray. See :meth:`~pyqtgraph.ROI.getArrayRegion` for a description of the arguments. Note: ``returnMappedCoords`` is not yet supported for this ROI type. """ rgns = [] for l in self.lines: rgn = l.getArrayRegion(arr, img, axes=axes, **kwds) if rgn is None: continue rgns.append(rgn) #print l.state['size'] ## make sure orthogonal axis is the same size ## (sometimes fp errors cause differences) if img.axisOrder == 'row-major': axes = axes[::-1] ms = min([r.shape[axes[1]] for r in rgns]) sl = [slice(None)] * rgns[0].ndim sl[axes[1]] = slice(0,ms) rgns = [r[tuple(sl)] for r in rgns] #print [r.shape for r in rgns], axes return np.concatenate(rgns, axis=axes[0])
[docs] def addSegment(self, pos=(0,0), scaleHandle=False, connectTo=None): """ Add a new segment to the ROI connecting from the previous endpoint to *pos*. (pos is specified in the parent coordinate system of the MultiRectROI) """ ## by default, connect to the previous endpoint if connectTo is None: connectTo = self.lines[-1].getHandles()[1] ## create new ROI newRoi = ROI((0,0), [1, 5], parent=self, pen=self.pen, **self.roiArgs) self.lines.append(newRoi) ## Add first SR handle if isinstance(connectTo, Handle): self.lines[-1].addScaleRotateHandle([0, 0.5], [1, 0.5], item=connectTo) newRoi.movePoint(connectTo, connectTo.scenePos(), coords='scene') else: h = self.lines[-1].addScaleRotateHandle([0, 0.5], [1, 0.5]) newRoi.movePoint(h, connectTo, coords='scene') ## add second SR handle h = self.lines[-1].addScaleRotateHandle([1, 0.5], [0, 0.5]) newRoi.movePoint(h, pos) ## optionally add scale handle (this MUST come after the two SR handles) if scaleHandle: newRoi.addScaleHandle([0.5, 1], [0.5, 0.5]) newRoi.translatable = False newRoi.sigRegionChanged.connect(self.roiChangedEvent) newRoi.sigRegionChangeStarted.connect(self.roiChangeStartedEvent) newRoi.sigRegionChangeFinished.connect(self.roiChangeFinishedEvent) self.sigRegionChanged.emit(self)
[docs] def removeSegment(self, index=-1): """Remove a segment from the ROI.""" roi = self.lines[index] self.lines.pop(index) self.scene().removeItem(roi) roi.sigRegionChanged.disconnect(self.roiChangedEvent) roi.sigRegionChangeStarted.disconnect(self.roiChangeStartedEvent) roi.sigRegionChangeFinished.disconnect(self.roiChangeFinishedEvent) self.sigRegionChanged.emit(self)
class MultiLineROI(MultiRectROI): def __init__(self, *args, **kwds): MultiRectROI.__init__(self, *args, **kwds) print("Warning: MultiLineROI has been renamed to MultiRectROI. (and MultiLineROI may be redefined in the future)")
[docs]class EllipseROI(ROI): r""" Elliptical ROI subclass with one scale handle and one rotation handle. ============== ============================================================= **Arguments** pos (length-2 sequence) The position of the ROI's origin. size (length-2 sequence) The size of the ROI's bounding rectangle. \**args All extra keyword arguments are passed to ROI() ============== ============================================================= """ def __init__(self, pos, size, **args): self.path = None ROI.__init__(self, pos, size, **args) self.sigRegionChanged.connect(self._clearPath) self._addHandles() def _addHandles(self): self.addRotateHandle([1.0, 0.5], [0.5, 0.5]) self.addScaleHandle([0.5*2.**-0.5 + 0.5, 0.5*2.**-0.5 + 0.5], [0.5, 0.5]) def _clearPath(self): self.path = None def paint(self, p, opt, widget): r = self.boundingRect() p.setRenderHint(QtGui.QPainter.RenderHint.Antialiasing) p.setPen(self.currentPen) p.scale(r.width(), r.height())## workaround for GL bug r = QtCore.QRectF(r.x()/r.width(), r.y()/r.height(), 1,1) p.drawEllipse(r)
[docs] def getArrayRegion(self, arr, img=None, axes=(0, 1), returnMappedCoords=False, **kwds): """ Return the result of :meth:`~pyqtgraph.ROI.getArrayRegion` masked by the elliptical shape of the ROI. Regions outside the ellipse are set to 0. See :meth:`~pyqtgraph.ROI.getArrayRegion` for a description of the arguments. Note: ``returnMappedCoords`` is not yet supported for this ROI type. """ # Note: we could use the same method as used by PolyLineROI, but this # implementation produces a nicer mask. if returnMappedCoords: arr, mappedCoords = ROI.getArrayRegion(self, arr, img, axes, returnMappedCoords, **kwds) else: arr = ROI.getArrayRegion(self, arr, img, axes, returnMappedCoords, **kwds) if arr is None or arr.shape[axes[0]] == 0 or arr.shape[axes[1]] == 0: if returnMappedCoords: return arr, mappedCoords else: return arr w = arr.shape[axes[0]] h = arr.shape[axes[1]] ## generate an ellipsoidal mask mask = np.fromfunction(lambda x,y: np.hypot(((x+0.5)/(w/2.)-1), ((y+0.5)/(h/2.)-1)) < 1, (w, h)) # reshape to match array axes if axes[0] > axes[1]: mask = mask.T shape = [(n if i in axes else 1) for i,n in enumerate(arr.shape)] mask = mask.reshape(shape) if returnMappedCoords: return arr * mask, mappedCoords else: return arr * mask
def shape(self): if self.path is None: path = QtGui.QPainterPath() # Note: Qt has a bug where very small ellipses (radius <0.001) do # not correctly intersect with mouse position (upper-left and # lower-right quadrants are not clickable). #path.addEllipse(self.boundingRect()) # Workaround: manually draw the path. br = self.boundingRect() center = br.center() r1 = br.width() / 2. r2 = br.height() / 2. theta = np.linspace(0, 2 * np.pi, 24) x = center.x() + r1 * np.cos(theta) y = center.y() + r2 * np.sin(theta) path.moveTo(x[0], y[0]) for i in range(1, len(x)): path.lineTo(x[i], y[i]) self.path = path return self.path
[docs]class CircleROI(EllipseROI): r""" Circular ROI subclass. Behaves exactly as EllipseROI, but may only be scaled proportionally to maintain its aspect ratio. ============== ============================================================= **Arguments** pos (length-2 sequence) The position of the ROI's origin. size (length-2 sequence) The size of the ROI's bounding rectangle. \**args All extra keyword arguments are passed to ROI() ============== ============================================================= """ def __init__(self, pos, size=None, radius=None, **args): if size is None: if radius is None: raise TypeError("Must provide either size or radius.") size = (radius*2, radius*2) EllipseROI.__init__(self, pos, size, aspectLocked=True, **args) def _addHandles(self): self.addScaleHandle([0.5*2.**-0.5 + 0.5, 0.5*2.**-0.5 + 0.5], [0.5, 0.5])
class PolygonROI(ROI): def __init__(self, positions, pos=None, **args): warnings.warn( 'PolygonROI has been deprecated, will be removed in 0.13' 'use PolyLineROI instead', DeprecationWarning, stacklevel=2 ) if pos is None: pos = [0,0] ROI.__init__(self, pos, [1,1], **args) for p in positions: self.addFreeHandle(p) self.setZValue(1000) def listPoints(self): return [p['item'].pos() for p in self.handles] def paint(self, p, *args): p.setRenderHint(QtGui.QPainter.RenderHint.Antialiasing) p.setPen(self.currentPen) for i in range(len(self.handles)): h1 = self.handles[i]['item'].pos() h2 = self.handles[i-1]['item'].pos() p.drawLine(h1, h2) def boundingRect(self): r = QtCore.QRectF() for h in self.handles: r |= self.mapFromItem(h['item'], h['item'].boundingRect()).boundingRect() ## |= gives the union of the two QRectFs return r def shape(self): p = QtGui.QPainterPath() p.moveTo(self.handles[0]['item'].pos()) for i in range(len(self.handles)): p.lineTo(self.handles[i]['item'].pos()) return p def stateCopy(self): sc = {} sc['pos'] = Point(self.state['pos']) sc['size'] = Point(self.state['size']) sc['angle'] = self.state['angle'] return sc
[docs]class PolyLineROI(ROI): r""" Container class for multiple connected LineSegmentROIs. This class allows the user to draw paths of multiple line segments. ============== ============================================================= **Arguments** positions (list of length-2 sequences) The list of points in the path. Note that, unlike the handle positions specified in other ROIs, these positions must be expressed in the normal coordinate system of the ROI, rather than (0 to 1) relative to the size of the ROI. closed (bool) if True, an extra LineSegmentROI is added connecting the beginning and end points. \**args All extra keyword arguments are passed to ROI() ============== ============================================================= """ def __init__(self, positions, closed=False, pos=None, **args): if pos is None: pos = [0,0] self.closed = closed self.segments = [] ROI.__init__(self, pos, size=[1,1], **args) self.setPoints(positions)
[docs] def setPoints(self, points, closed=None): """ Set the complete sequence of points displayed by this ROI. ============= ========================================================= **Arguments** points List of (x,y) tuples specifying handle locations to set. closed If bool, then this will set whether the ROI is closed (the last point is connected to the first point). If None, then the closed mode is left unchanged. ============= ========================================================= """ if closed is not None: self.closed = closed self.clearPoints() for p in points: self.addFreeHandle(p) start = -1 if self.closed else 0 for i in range(start, len(self.handles)-1): self.addSegment(self.handles[i]['item'], self.handles[i+1]['item'])
[docs] def clearPoints(self): """ Remove all handles and segments. """ while len(self.handles) > 0: self.removeHandle(self.handles[0]['item'])
def getState(self): state = ROI.getState(self) state['closed'] = self.closed state['points'] = [Point(h.pos()) for h in self.getHandles()] return state def saveState(self): state = ROI.saveState(self) state['closed'] = self.closed state['points'] = [tuple(h.pos()) for h in self.getHandles()] return state def setState(self, state): ROI.setState(self, state) self.setPoints(state['points'], closed=state['closed']) def addSegment(self, h1, h2, index=None): seg = _PolyLineSegment(handles=(h1, h2), pen=self.pen, hoverPen=self.hoverPen, parent=self, movable=False) if index is None: self.segments.append(seg) else: self.segments.insert(index, seg) seg.sigClicked.connect(self.segmentClicked) seg.setAcceptedMouseButtons(QtCore.Qt.MouseButton.LeftButton) seg.setZValue(self.zValue()+1) for h in seg.handles: h['item'].setDeletable(True) h['item'].setAcceptedMouseButtons(h['item'].acceptedMouseButtons() | QtCore.Qt.MouseButton.LeftButton) ## have these handles take left clicks too, so that handles cannot be added on top of other handles def setMouseHover(self, hover): ## Inform all the ROI's segments that the mouse is(not) hovering over it ROI.setMouseHover(self, hover) for s in self.segments: s.setParentHover(hover) def addHandle(self, info, index=None): h = ROI.addHandle(self, info, index=index) h.sigRemoveRequested.connect(self.removeHandle) self.stateChanged(finish=True) return h def segmentClicked(self, segment, ev=None, pos=None): ## pos should be in this item's coordinate system if ev is not None: pos = segment.mapToParent(ev.pos()) elif pos is None: raise Exception("Either an event or a position must be given.") h2 = segment.handles[1]['item'] i = self.segments.index(segment) h3 = self.addFreeHandle(pos, index=self.indexOfHandle(h2)) self.addSegment(h3, h2, index=i+1) segment.replaceHandle(h2, h3) def removeHandle(self, handle, updateSegments=True): ROI.removeHandle(self, handle) handle.sigRemoveRequested.disconnect(self.removeHandle) if not updateSegments: return segments = handle.rois[:] if len(segments) == 1: self.removeSegment(segments[0]) elif len(segments) > 1: handles = [h['item'] for h in segments[1].handles] handles.remove(handle) segments[0].replaceHandle(handle, handles[0]) self.removeSegment(segments[1]) self.stateChanged(finish=True) def removeSegment(self, seg): for handle in seg.handles[:]: seg.removeHandle(handle['item']) self.segments.remove(seg) seg.sigClicked.disconnect(self.segmentClicked) self.scene().removeItem(seg) def checkRemoveHandle(self, h): ## called when a handle is about to display its context menu if self.closed: return len(self.handles) > 3 else: return len(self.handles) > 2 def paint(self, p, *args): pass def boundingRect(self): return self.shape().boundingRect() def shape(self): p = QtGui.QPainterPath() if len(self.handles) == 0: return p p.moveTo(self.handles[0]['item'].pos()) for i in range(len(self.handles)): p.lineTo(self.handles[i]['item'].pos()) p.lineTo(self.handles[0]['item'].pos()) return p def getArrayRegion(self, *args, **kwds): return self._getArrayRegionForArbitraryShape(*args, **kwds) def setPen(self, *args, **kwds): ROI.setPen(self, *args, **kwds) for seg in self.segments: seg.setPen(*args, **kwds)
[docs]class LineSegmentROI(ROI): r""" ROI subclass with two freely-moving handles defining a line. ============== ============================================================= **Arguments** positions (list of two length-2 sequences) The endpoints of the line segment. Note that, unlike the handle positions specified in other ROIs, these positions must be expressed in the normal coordinate system of the ROI, rather than (0 to 1) relative to the size of the ROI. \**args All extra keyword arguments are passed to ROI() ============== ============================================================= """ def __init__(self, positions=(None, None), pos=None, handles=(None,None), **args): if pos is None: pos = [0,0] ROI.__init__(self, pos, [1,1], **args) if len(positions) > 2: raise Exception("LineSegmentROI must be defined by exactly 2 positions. For more points, use PolyLineROI.") for i, p in enumerate(positions): self.addFreeHandle(p, item=handles[i]) @property def endpoints(self): # must not be cached because self.handles may change. return [h['item'] for h in self.handles] def listPoints(self): return [p['item'].pos() for p in self.handles] def getState(self): state = ROI.getState(self) state['points'] = [Point(h.pos()) for h in self.getHandles()] return state def saveState(self): state = ROI.saveState(self) state['points'] = [tuple(h.pos()) for h in self.getHandles()] return state def setState(self, state): ROI.setState(self, state) p1 = [state['points'][0][0]+state['pos'][0], state['points'][0][1]+state['pos'][1]] p2 = [state['points'][1][0]+state['pos'][0], state['points'][1][1]+state['pos'][1]] self.movePoint(self.getHandles()[0], p1, finish=False) self.movePoint(self.getHandles()[1], p2) def paint(self, p, *args): p.setRenderHint(QtGui.QPainter.RenderHint.Antialiasing) p.setPen(self.currentPen) h1 = self.endpoints[0].pos() h2 = self.endpoints[1].pos() p.drawLine(h1, h2) def boundingRect(self): return self.shape().boundingRect() def shape(self): p = QtGui.QPainterPath() h1 = self.endpoints[0].pos() h2 = self.endpoints[1].pos() dh = h2-h1 if dh.length() == 0: return p pxv = self.pixelVectors(dh)[1] if pxv is None: return p pxv *= 4 p.moveTo(h1+pxv) p.lineTo(h2+pxv) p.lineTo(h2-pxv) p.lineTo(h1-pxv) p.lineTo(h1+pxv) return p
[docs] def getArrayRegion(self, data, img, axes=(0,1), order=1, returnMappedCoords=False, **kwds): """ Use the position of this ROI relative to an imageItem to pull a slice from an array. Since this pulls 1D data from a 2D coordinate system, the return value will have ndim = data.ndim-1 See :meth:`~pyqtgraph.ROI.getArrayRegion` for a description of the arguments. """ imgPts = [self.mapToItem(img, h.pos()) for h in self.endpoints] d = Point(imgPts[1] - imgPts[0]) o = Point(imgPts[0]) rgn = fn.affineSlice(data, shape=(int(d.length()),), vectors=[Point(d.norm())], origin=o, axes=axes, order=order, returnCoords=returnMappedCoords, **kwds) return rgn
class _PolyLineSegment(LineSegmentROI): # Used internally by PolyLineROI def __init__(self, *args, **kwds): self._parentHovering = False LineSegmentROI.__init__(self, *args, **kwds) def setParentHover(self, hover): # set independently of own hover state if self._parentHovering != hover: self._parentHovering = hover self._updateHoverColor() def _makePen(self): if self.mouseHovering or self._parentHovering: return self.hoverPen else: return self.pen def hoverEvent(self, ev): # accept drags even though we discard them to prevent competition with parent ROI # (unless parent ROI is not movable) if self.parentItem().translatable: ev.acceptDrags(QtCore.Qt.MouseButton.LeftButton) return LineSegmentROI.hoverEvent(self, ev) class CrosshairROI(ROI): """A crosshair ROI whose position is at the center of the crosshairs. By default, it is scalable, rotatable and translatable.""" def __init__(self, pos=None, size=None, **kargs): if size is None: size=[1,1] if pos is None: pos = [0,0] self._shape = None ROI.__init__(self, pos, size, aspectLocked=True, **kargs) self.sigRegionChanged.connect(self.invalidate) self.addScaleRotateHandle(Point(1, 0), Point(0, 0)) def invalidate(self): self._shape = None self.prepareGeometryChange() def boundingRect(self): return self.shape().boundingRect() def shape(self): if self._shape is None: radius = self.getState()['size'][1] p = QtGui.QPainterPath() p.moveTo(Point(0, -radius)) p.lineTo(Point(0, radius)) p.moveTo(Point(-radius, 0)) p.lineTo(Point(radius, 0)) p = self.mapToDevice(p) stroker = QtGui.QPainterPathStroker() stroker.setWidth(10) outline = stroker.createStroke(p) self._shape = self.mapFromDevice(outline) return self._shape def paint(self, p, *args): radius = self.getState()['size'][1] p.setRenderHint(QtGui.QPainter.RenderHint.Antialiasing) p.setPen(self.currentPen) p.drawLine(Point(0, -radius), Point(0, radius)) p.drawLine(Point(-radius, 0), Point(radius, 0)) class RulerROI(LineSegmentROI): def paint(self, p, *args): LineSegmentROI.paint(self, p, *args) h1 = self.handles[0]['item'].pos() h2 = self.handles[1]['item'].pos() p1 = p.transform().map(h1) p2 = p.transform().map(h2) vec = Point(h2) - Point(h1) length = vec.length() angle = vec.angle(Point(1, 0)) pvec = p2 - p1 pvecT = Point(pvec.y(), -pvec.x()) pos = 0.5 * (p1 + p2) + pvecT * 40 / pvecT.length() p.resetTransform() txt = fn.siFormat(length, suffix='m') + '\n%0.1f deg' % angle p.drawText(QtCore.QRectF(pos.x()-50, pos.y()-50, 100, 100), QtCore.Qt.AlignmentFlag.AlignCenter, txt) def boundingRect(self): r = LineSegmentROI.boundingRect(self) pxl = self.pixelLength(Point([1, 0])) if pxl is None: return r pxw = 50 * pxl return r.adjusted(-50, -50, 50, 50) class TriangleROI(ROI): r""" Equilateral triangle ROI subclass with one scale handle and one rotation handle. Arguments pos (length-2 sequence) The position of the ROI's origin. size (float) The length of an edge of the triangle. \**args All extra keyword arguments are passed to ROI() ============== ============================================================= """ def __init__(self, pos, size, **args): ROI.__init__(self, pos, [size, size], aspectLocked=True, **args) angles = np.linspace(0, np.pi * 4 / 3, 3) verticies = (np.array((np.sin(angles), np.cos(angles))).T + 1.0) / 2.0 self.poly = QtGui.QPolygonF() for pt in verticies: self.poly.append(QtCore.QPointF(*pt)) self.addRotateHandle(verticies[0], [0.5, 0.5]) self.addScaleHandle(verticies[1], [0.5, 0.5]) def paint(self, p, *args): r = self.boundingRect() p.setRenderHint(QtGui.QPainter.RenderHint.Antialiasing) p.scale(r.width(), r.height()) p.setPen(self.currentPen) p.drawPolygon(self.poly) def shape(self): self.path = QtGui.QPainterPath() r = self.boundingRect() # scale the path to match whats on the screen t = QtGui.QTransform() t.scale(r.width(), r.height()) self.path.addPolygon(self.poly) return t.map(self.path) def getArrayRegion(self, *args, **kwds): return self._getArrayRegionForArbitraryShape(*args, **kwds)