Source code for pyqtgraph.graphicsItems.LinearRegionItem

from .. import debug
from .. import functions as fn
from ..Qt import QtCore, QtGui
from .GraphicsObject import GraphicsObject
from .InfiniteLine import InfiniteLine

__all__ = ['LinearRegionItem']

[docs]class LinearRegionItem(GraphicsObject): """ **Bases:** :class:`GraphicsObject <pyqtgraph.GraphicsObject>` Used for marking a horizontal or vertical region in plots. The region can be dragged and is bounded by lines which can be dragged individually. =============================== ============================================================================= **Signals:** sigRegionChangeFinished(self) Emitted when the user has finished dragging the region (or one of its lines) and when the region is changed programatically. sigRegionChanged(self) Emitted while the user is dragging the region (or one of its lines) and when the region is changed programatically. =============================== ============================================================================= """ sigRegionChangeFinished = QtCore.Signal(object) sigRegionChanged = QtCore.Signal(object) Vertical = 0 Horizontal = 1 _orientation_axis = { Vertical: 0, Horizontal: 1, 'vertical': 0, 'horizontal': 1, }
[docs] def __init__(self, values=(0, 1), orientation='vertical', brush=None, pen=None, hoverBrush=None, hoverPen=None, movable=True, bounds=None, span=(0, 1), swapMode='sort', clipItem=None): """Create a new LinearRegionItem. ============== ===================================================================== **Arguments:** values A list of the positions of the lines in the region. These are not limits; limits can be set by specifying bounds. orientation Options are 'vertical' or 'horizontal' The default is 'vertical', indicating that the region is bounded by vertical lines. brush Defines the brush that fills the region. Can be any arguments that are valid for :func:`mkBrush <pyqtgraph.mkBrush>`. Default is transparent blue. pen The pen to use when drawing the lines that bound the region. hoverBrush The brush to use when the mouse is hovering over the region. hoverPen The pen to use when the mouse is hovering over the region. movable If True, the region and individual lines are movable by the user; if False, they are static. bounds Optional [min, max] bounding values for the region span Optional [min, max] giving the range over the view to draw the region. For example, with a vertical line, use ``span=(0.5, 1)`` to draw only on the top half of the view. swapMode Sets the behavior of the region when the lines are moved such that their order reverses: * "block" means the user cannot drag one line past the other * "push" causes both lines to be moved if one would cross the other * "sort" means that lines may trade places, but the output of getRegion always gives the line positions in ascending order. * None means that no attempt is made to handle swapped line positions. The default is "sort". clipItem An item whose bounds will be used to limit the region bounds. This is useful when a LinearRegionItem is added on top of an :class:`~pyqtgraph.ImageItem` or :class:`~pyqtgraph.PlotDataItem` and the visual region should not extend beyond its range. This overrides ``bounds``. ============== ===================================================================== """ GraphicsObject.__init__(self) self.orientation = orientation self.blockLineSignal = False self.moving = False self.mouseHovering = False self.span = span self.swapMode = swapMode self.clipItem = clipItem self._boundingRectCache = None self._clipItemBoundsCache = None # note LinearRegionItem.Horizontal and LinearRegionItem.Vertical # are kept for backward compatibility. lineKwds = dict( movable=movable, bounds=bounds, span=span, pen=pen, hoverPen=hoverPen, ) if orientation in ('horizontal', LinearRegionItem.Horizontal): self.lines = [ # rotate lines to 180 to preserve expected line orientation # with respect to region. This ensures that placing a '<|' # marker on lines[0] causes it to point left in vertical mode # and down in horizontal mode. InfiniteLine(QtCore.QPointF(0, values[0]), angle=0, **lineKwds), InfiniteLine(QtCore.QPointF(0, values[1]), angle=0, **lineKwds)] tr = QtGui.QTransform.fromScale(1, -1) self.lines[0].setTransform(tr, True) self.lines[1].setTransform(tr, True) elif orientation in ('vertical', LinearRegionItem.Vertical): self.lines = [ InfiniteLine(QtCore.QPointF(values[0], 0), angle=90, **lineKwds), InfiniteLine(QtCore.QPointF(values[1], 0), angle=90, **lineKwds)] else: raise Exception("Orientation must be 'vertical' or 'horizontal'.") for l in self.lines: l.setParentItem(self) l.sigPositionChangeFinished.connect(self.lineMoveFinished) self.lines[0].sigPositionChanged.connect(self._line0Moved) self.lines[1].sigPositionChanged.connect(self._line1Moved) if brush is None: brush = QtGui.QBrush(QtGui.QColor(0, 0, 255, 50)) self.setBrush(brush) if hoverBrush is None: c = self.brush.color() c.setAlpha(min(c.alpha() * 2, 255)) hoverBrush = fn.mkBrush(c) self.setHoverBrush(hoverBrush) self.setMovable(movable)
[docs] def getRegion(self): """Return the values at the edges of the region.""" r = (self.lines[0].value(), self.lines[1].value()) if self.swapMode == 'sort': return (min(r), max(r)) else: return r
[docs] def setRegion(self, rgn): """Set the values for the edges of the region. ============== ============================================== **Arguments:** rgn A list or tuple of the lower and upper values. ============== ============================================== """ if self.lines[0].value() == rgn[0] and self.lines[1].value() == rgn[1]: return self.blockLineSignal = True self.lines[0].setValue(rgn[0]) self.blockLineSignal = False self.lines[1].setValue(rgn[1]) #self.blockLineSignal = False self.lineMoved(0) self.lineMoved(1) self.lineMoveFinished()
[docs] def setBrush(self, *br, **kargs): """Set the brush that fills the region. Can have any arguments that are valid for :func:`mkBrush <pyqtgraph.mkBrush>`. """ self.brush = fn.mkBrush(*br, **kargs) self.currentBrush = self.brush
[docs] def setHoverBrush(self, *br, **kargs): """Set the brush that fills the region when the mouse is hovering over. Can have any arguments that are valid for :func:`mkBrush <pyqtgraph.mkBrush>`. """ self.hoverBrush = fn.mkBrush(*br, **kargs)
[docs] def setBounds(self, bounds): """Set ``(min, max)`` bounding values for the region. The current position is only affected it is outside the new bounds. See :func:`~pyqtgraph.LinearRegionItem.setRegion` to set the position of the region. Use ``(None, None)`` to disable bounds. """ if self.clipItem is not None: self.setClipItem(None) self._setBounds(bounds)
def _setBounds(self, bounds): # internal impl so user-facing setBounds can clear clipItem and clipItem can # set bounds without clearing itself for line in self.lines: line.setBounds(bounds)
[docs] def setMovable(self, m=True): """Set lines to be movable by the user, or not. If lines are movable, they will also accept HoverEvents.""" for line in self.lines: line.setMovable(m) self.movable = m self.setAcceptHoverEvents(m)
def setSpan(self, mn, mx): if self.span == (mn, mx): return self.span = (mn, mx) for line in self.lines: line.setSpan(mn, mx) self.update()
[docs] def setClipItem(self, item=None): """Set an item to which the region is bounded. If ``None``, bounds are disabled. """ self.clipItem = item self._clipItemBoundsCache = None if item is None: self._setBounds((None, None)) if item is not None: self._updateClipItemBounds()
def _updateClipItemBounds(self): # set region bounds corresponding to clipItem item_vb = self.clipItem.getViewBox() if item_vb is None: return item_bounds = item_vb.childrenBounds(items=(self.clipItem,)) if item_bounds == self._clipItemBoundsCache or None in item_bounds: return self._clipItemBoundsCache = item_bounds if self.orientation in ('horizontal', LinearRegionItem.Horizontal): self._setBounds(item_bounds[1]) else: self._setBounds(item_bounds[0]) def boundingRect(self): br = QtCore.QRectF(self.viewRect()) # bounds of containing ViewBox mapped to local coords. if self.clipItem is not None: self._updateClipItemBounds() rng = self.getRegion() if self.orientation in ('vertical', LinearRegionItem.Vertical): br.setLeft(rng[0]) br.setRight(rng[1]) length = br.height() br.setBottom(br.top() + length * self.span[1]) br.setTop(br.top() + length * self.span[0]) else: br.setTop(rng[0]) br.setBottom(rng[1]) length = br.width() br.setRight(br.left() + length * self.span[1]) br.setLeft(br.left() + length * self.span[0]) br = br.normalized() if self._boundingRectCache != br: self._boundingRectCache = br self.prepareGeometryChange() return br def paint(self, p, *args): profiler = debug.Profiler() # noqa: profiler does prints on GC p.setBrush(self.currentBrush) p.setPen(fn.mkPen(None)) p.drawRect(self.boundingRect()) def dataBounds(self, axis, frac=1.0, orthoRange=None): if axis == self._orientation_axis[self.orientation]: return self.getRegion() else: return None def lineMoved(self, i): if self.blockLineSignal: return # lines swapped if self.lines[0].value() > self.lines[1].value(): if self.swapMode == 'block': self.lines[i].setValue(self.lines[1-i].value()) elif self.swapMode == 'push': self.lines[1-i].setValue(self.lines[i].value()) self.prepareGeometryChange() self.sigRegionChanged.emit(self) def _line0Moved(self): self.lineMoved(0) def _line1Moved(self): self.lineMoved(1) def lineMoveFinished(self): self.sigRegionChangeFinished.emit(self) def mouseDragEvent(self, ev): if not self.movable or ev.button() != QtCore.Qt.MouseButton.LeftButton: return ev.accept() if ev.isStart(): bdp = ev.buttonDownPos() self.cursorOffsets = [l.pos() - bdp for l in self.lines] self.startPositions = [l.pos() for l in self.lines] self.moving = True if not self.moving: return self.lines[0].blockSignals(True) # only want to update once for i, l in enumerate(self.lines): l.setPos(self.cursorOffsets[i] + ev.pos()) self.lines[0].blockSignals(False) self.prepareGeometryChange() if ev.isFinish(): self.moving = False self.sigRegionChangeFinished.emit(self) else: self.sigRegionChanged.emit(self) def mouseClickEvent(self, ev): if self.moving and ev.button() == QtCore.Qt.MouseButton.RightButton: ev.accept() for i, l in enumerate(self.lines): l.setPos(self.startPositions[i]) self.moving = False self.sigRegionChanged.emit(self) self.sigRegionChangeFinished.emit(self) def hoverEvent(self, ev): if self.movable and (not ev.isExit()) and ev.acceptDrags(QtCore.Qt.MouseButton.LeftButton): self.setMouseHover(True) else: self.setMouseHover(False) def setMouseHover(self, hover): ## Inform the item that the mouse is(not) hovering over it if self.mouseHovering == hover: return self.mouseHovering = hover if hover: self.currentBrush = self.hoverBrush else: self.currentBrush = self.brush self.update()