Source code for pyqtgraph.graphicsItems.PlotCurveItem

# -*- coding: utf-8 -*-
from ..Qt import QtCore, QtGui, QtWidgets
HAVE_OPENGL = hasattr(QtWidgets, 'QOpenGLWidget')
from .. import Qt
import math
import itertools
import warnings
import numpy as np
from .GraphicsObject import GraphicsObject
from .. import functions as fn
import sys
from .. import getConfigOption
from .. import debug

__all__ = ['PlotCurveItem']


if Qt.QT_LIB.startswith('PyQt'):
    wrapinstance = Qt.sip.wrapinstance
else:
    wrapinstance = Qt.shiboken.wrapInstance


class LineSegments:
    def __init__(self):
        self.alloc(0)

    def alloc(self, size):
        self.arr = np.empty((size, 4), dtype=np.float64)
        self.ptrs = list(map(wrapinstance,
            itertools.count(self.arr.ctypes.data, self.arr.strides[0]),
            itertools.repeat(QtCore.QLineF, self.arr.shape[0])))

    def array(self, size):
        if size > self.arr.shape[0]:
            self.alloc(size + 16)
        return self.arr[:size]

    def instances(self, size):
        return self.ptrs[:size]

    def arrayToLineSegments(self, x, y, connect, finiteCheck):
        # analogue of arrayToQPath taking the same parameters
        if len(x) < 2:
            return []

        connect_array = None
        if isinstance(connect, np.ndarray):
            connect_array, connect = connect, 'array'

        all_finite = True
        if finiteCheck or connect == 'finite':
            mask = np.isfinite(x) & np.isfinite(y)
            all_finite = np.all(mask)

        if connect == 'all':
            if not all_finite:
                # remove non-finite points, if any
                x = x[mask]
                y = y[mask]

        elif connect == 'finite':
            if not all_finite:
                # each non-finite point affects the segment before and after
                connect_array = mask[:-1] & mask[1:]

        elif connect in ['pairs', 'array']:
            if not all_finite:
                # replicate the behavior of arrayToQPath
                backfill_idx = fn._compute_backfill_indices(mask)
                x = x[backfill_idx]
                y = y[backfill_idx]

        npts = len(x)
        if npts < 2:
            return []

        segs = []

        if connect in ['all', 'finite', 'array']:
            memory = self.array(npts - 1)
            memory[:, 0] = x[:-1]
            memory[:, 1] = y[:-1]
            memory[:, 2] = x[1:]
            memory[:, 3] = y[1:]
            segs = self.instances(npts - 1)
            if connect_array is not None:
                segs = list(itertools.compress(segs, connect_array.tolist()))

        elif connect in ['pairs']:
            npairs = npts // 2
            memory = self.array(npairs).reshape((-1, 2))
            memory[:, 0] = x[:npairs * 2]
            memory[:, 1] = y[:npairs * 2]
            segs = self.instances(npairs)

        return segs


[docs]class PlotCurveItem(GraphicsObject): """ Class representing a single plot curve. Instances of this class are created automatically as part of PlotDataItem; these rarely need to be instantiated directly. Features: - Fast data update - Fill under curve - Mouse interaction ===================== =============================================== **Signals:** sigPlotChanged(self) Emitted when the data being plotted has changed sigClicked(self, ev) Emitted when the curve is clicked ===================== =============================================== """ sigPlotChanged = QtCore.Signal(object) sigClicked = QtCore.Signal(object, object)
[docs] def __init__(self, *args, **kargs): """ Forwards all arguments to :func:`setData <pyqtgraph.PlotCurveItem.setData>`. Some extra arguments are accepted as well: ============== ======================================================= **Arguments:** parent The parent GraphicsObject (optional) clickable If True, the item will emit sigClicked when it is clicked on. Defaults to False. ============== ======================================================= """ GraphicsObject.__init__(self, kargs.get('parent', None)) self.clear() ## this is disastrous for performance. #self.setCacheMode(QtGui.QGraphicsItem.CacheMode.DeviceCoordinateCache) self.metaData = {} self.opts = { 'shadowPen': None, 'fillLevel': None, 'fillOutline': False, 'brush': None, 'stepMode': None, 'name': None, 'antialias': getConfigOption('antialias'), 'connect': 'all', 'mouseWidth': 8, # width of shape responding to mouse click 'compositionMode': None, 'skipFiniteCheck': True } if 'pen' not in kargs: self.opts['pen'] = fn.mkPen('w') self.setClickable(kargs.get('clickable', False)) self.setData(*args, **kargs)
def implements(self, interface=None): ints = ['plotData'] if interface is None: return ints return interface in ints def name(self): return self.opts.get('name', None)
[docs] def setClickable(self, s, width=None): """Sets whether the item responds to mouse clicks. The *width* argument specifies the width in pixels orthogonal to the curve that will respond to a mouse click. """ self.clickable = s if width is not None: self.opts['mouseWidth'] = width self._mouseShape = None self._boundingRect = None
[docs] def setCompositionMode(self, mode): """ Change the composition mode of the item. This is useful when overlaying multiple items. Parameters ---------- mode : ``QtGui.QPainter.CompositionMode`` Composition of the item, often used when overlaying items. Common options include: ``QPainter.CompositionMode.CompositionMode_SourceOver`` (Default) Image replaces the background if it is opaque. Otherwise, it uses the alpha channel to blend the image with the background. ``QPainter.CompositionMode.CompositionMode_Overlay`` Image color is mixed with the background color to reflect the lightness or darkness of the background ``QPainter.CompositionMode.CompositionMode_Plus`` Both the alpha and color of the image and background pixels are added together. ``QPainter.CompositionMode.CompositionMode_Plus`` The output is the image color multiplied by the background. See ``QPainter::CompositionMode`` in the Qt Documentation for more options and details """ self.opts['compositionMode'] = mode self.update()
def getData(self): return self.xData, self.yData def dataBounds(self, ax, frac=1.0, orthoRange=None): ## Need this to run as fast as possible. ## check cache first: cache = self._boundsCache[ax] if cache is not None and cache[0] == (frac, orthoRange): return cache[1] (x, y) = self.getData() if x is None or len(x) == 0: return (None, None) if ax == 0: d = x d2 = y elif ax == 1: d = y d2 = x else: raise ValueError("Invalid axis value") ## If an orthogonal range is specified, mask the data now if orthoRange is not None: mask = (d2 >= orthoRange[0]) * (d2 <= orthoRange[1]) d = d[mask] #d2 = d2[mask] if len(d) == 0: return (None, None) ## Get min/max (or percentiles) of the requested data range if frac >= 1.0: # include complete data range # first try faster nanmin/max function, then cut out infs if needed. with warnings.catch_warnings(): # All-NaN data is acceptable; Explicit numpy warning is not needed. warnings.simplefilter("ignore") b = (np.nanmin(d), np.nanmax(d)) if math.isinf(b[0]) or math.isinf(b[1]): mask = np.isfinite(d) d = d[mask] if len(d) == 0: return (None, None) b = (d.min(), d.max()) elif frac <= 0.0: raise Exception("Value for parameter 'frac' must be > 0. (got %s)" % str(frac)) else: # include a percentile of data range mask = np.isfinite(d) d = d[mask] if len(d) == 0: return (None, None) b = np.percentile(d, [50 * (1 - frac), 50 * (1 + frac)]) ## adjust for fill level if ax == 1 and self.opts['fillLevel'] not in [None, 'enclosed']: b = (min(b[0], self.opts['fillLevel']), max(b[1], self.opts['fillLevel'])) ## Add pen width only if it is non-cosmetic. pen = self.opts['pen'] spen = self.opts['shadowPen'] if not pen.isCosmetic(): b = (b[0] - pen.widthF()*0.7072, b[1] + pen.widthF()*0.7072) if spen is not None and not spen.isCosmetic() and spen.style() != QtCore.Qt.PenStyle.NoPen: b = (b[0] - spen.widthF()*0.7072, b[1] + spen.widthF()*0.7072) self._boundsCache[ax] = [(frac, orthoRange), b] return b def pixelPadding(self): pen = self.opts['pen'] spen = self.opts['shadowPen'] w = 0 if pen.isCosmetic(): w += pen.widthF()*0.7072 if spen is not None and spen.isCosmetic() and spen.style() != QtCore.Qt.PenStyle.NoPen: w = max(w, spen.widthF()*0.7072) if self.clickable: w = max(w, self.opts['mouseWidth']//2 + 1) return w def boundingRect(self): if self._boundingRect is None: (xmn, xmx) = self.dataBounds(ax=0) if xmn is None or xmx is None: return QtCore.QRectF() (ymn, ymx) = self.dataBounds(ax=1) if ymn is None or ymx is None: return QtCore.QRectF() px = py = 0.0 pxPad = self.pixelPadding() if pxPad > 0: # determine length of pixel in local x, y directions px, py = self.pixelVectors() try: px = 0 if px is None else px.length() except OverflowError: px = 0 try: py = 0 if py is None else py.length() except OverflowError: py = 0 # return bounds expanded by pixel size px *= pxPad py *= pxPad #px += self._maxSpotWidth * 0.5 #py += self._maxSpotWidth * 0.5 self._boundingRect = QtCore.QRectF(xmn-px, ymn-py, (2*px)+xmx-xmn, (2*py)+ymx-ymn) return self._boundingRect def viewTransformChanged(self): self.invalidateBounds() self.prepareGeometryChange() #def boundingRect(self): #if self._boundingRect is None: #(x, y) = self.getData() #if x is None or y is None or len(x) == 0 or len(y) == 0: #return QtCore.QRectF() #if self.opts['shadowPen'] is not None: #lineWidth = (max(self.opts['pen'].width(), self.opts['shadowPen'].width()) + 1) #else: #lineWidth = (self.opts['pen'].width()+1) #pixels = self.pixelVectors() #if pixels == (None, None): #pixels = [Point(0,0), Point(0,0)] #xmin = x.min() #xmax = x.max() #ymin = y.min() #ymax = y.max() #if self.opts['fillLevel'] is not None: #ymin = min(ymin, self.opts['fillLevel']) #ymax = max(ymax, self.opts['fillLevel']) #xmin -= pixels[0].x() * lineWidth #xmax += pixels[0].x() * lineWidth #ymin -= abs(pixels[1].y()) * lineWidth #ymax += abs(pixels[1].y()) * lineWidth #self._boundingRect = QtCore.QRectF(xmin, ymin, xmax-xmin, ymax-ymin) #return self._boundingRect def invalidateBounds(self): self._boundingRect = None self._boundsCache = [None, None]
[docs] def setPen(self, *args, **kargs): """Set the pen used to draw the curve.""" self.opts['pen'] = fn.mkPen(*args, **kargs) self.invalidateBounds() self.update()
[docs] def setShadowPen(self, *args, **kargs): """Set the shadow pen used to draw behind the primary pen. This pen must have a larger width than the primary pen to be visible. """ self.opts['shadowPen'] = fn.mkPen(*args, **kargs) self.invalidateBounds() self.update()
[docs] def setBrush(self, *args, **kargs): """Set the brush used when filling the area under the curve""" self.opts['brush'] = fn.mkBrush(*args, **kargs) self.invalidateBounds() self.update()
[docs] def setFillLevel(self, level): """Set the level filled to when filling under the curve""" self.opts['fillLevel'] = level self.fillPath = None self.invalidateBounds() self.update()
[docs] def setData(self, *args, **kargs): """ =============== ======================================================== **Arguments:** x, y (numpy arrays) Data to show pen Pen to use when drawing. Any single argument accepted by :func:`mkPen <pyqtgraph.mkPen>` is allowed. shadowPen Pen for drawing behind the primary pen. Usually this is used to emphasize the curve by providing a high-contrast border. Any single argument accepted by :func:`mkPen <pyqtgraph.mkPen>` is allowed. fillLevel (float or None) Fill the area 'under' the curve to *fillLevel* fillOutline (bool) If True, an outline surrounding the *fillLevel* area is drawn. brush QBrush to use when filling. Any single argument accepted by :func:`mkBrush <pyqtgraph.mkBrush>` is allowed. antialias (bool) Whether to use antialiasing when drawing. This is disabled by default because it decreases performance. stepMode (str or None) If "center", a step is drawn using the x values as boundaries and the given y values are associated to the mid-points between the boundaries of each step. This is commonly used when drawing histograms. Note that in this case, len(x) == len(y) + 1 If "left" or "right", the step is drawn assuming that the y value is associated to the left or right boundary, respectively. In this case len(x) == len(y) If not passed or an empty string or None is passed, the step mode is not enabled. Passing True is a deprecated equivalent to "center". connect Argument specifying how vertexes should be connected by line segments. Default is "all", indicating full connection. "pairs" causes only even-numbered segments to be drawn. "finite" causes segments to be omitted if they are attached to nan or inf values. For any other connectivity, specify an array of boolean values. compositionMode See :func:`setCompositionMode <pyqtgraph.PlotCurveItem.setCompositionMode>`. skipFiniteCheck Optimization parameter that can speed up plot time by telling the painter to not check and compensate for NaN values. If set to True, and NaN values exist, the data may not be displayed or your plot will take a significant performance hit. Defaults to False. =============== ======================================================== If non-keyword arguments are used, they will be interpreted as setData(y) for a single argument and setData(x, y) for two arguments. """ self.updateData(*args, **kargs)
def updateData(self, *args, **kargs): profiler = debug.Profiler() if 'compositionMode' in kargs: self.setCompositionMode(kargs['compositionMode']) if len(args) == 1: kargs['y'] = args[0] elif len(args) == 2: kargs['x'] = args[0] kargs['y'] = args[1] if 'y' not in kargs or kargs['y'] is None: kargs['y'] = np.array([]) if 'x' not in kargs or kargs['x'] is None: kargs['x'] = np.arange(len(kargs['y'])) for k in ['x', 'y']: data = kargs[k] if isinstance(data, list): data = np.array(data) kargs[k] = data if not isinstance(data, np.ndarray) or data.ndim > 1: raise Exception("Plot data must be 1D ndarray.") if data.dtype.kind == 'c': raise Exception("Can not plot complex data types.") profiler("data checks") #self.setCacheMode(QtGui.QGraphicsItem.CacheMode.NoCache) ## Disabling and re-enabling the cache works around a bug in Qt 4.6 causing the cached results to display incorrectly ## Test this bug with test_PlotWidget and zoom in on the animated plot self.yData = kargs['y'].view(np.ndarray) self.xData = kargs['x'].view(np.ndarray) self.invalidateBounds() self.prepareGeometryChange() self.informViewBoundsChanged() profiler('copy') if 'stepMode' in kargs: self.opts['stepMode'] = kargs['stepMode'] if self.opts['stepMode'] in ("center", True): ## check against True for backwards compatibility if self.opts['stepMode'] is True: import warnings warnings.warn('stepMode=True is deprecated, use stepMode="center" instead', DeprecationWarning, stacklevel=3) if len(self.xData) != len(self.yData)+1: ## allow difference of 1 for step mode plots raise Exception("len(X) must be len(Y)+1 since stepMode=True (got %s and %s)" % (self.xData.shape, self.yData.shape)) else: if self.xData.shape != self.yData.shape: ## allow difference of 1 for step mode plots raise Exception("X and Y arrays must be the same shape--got %s and %s." % (self.xData.shape, self.yData.shape)) self.path = None self.fillPath = None self._mouseShape = None self._renderSegmentList = None if 'name' in kargs: self.opts['name'] = kargs['name'] if 'connect' in kargs: self.opts['connect'] = kargs['connect'] if 'pen' in kargs: self.setPen(kargs['pen']) if 'shadowPen' in kargs and kargs['shadowPen'] is not None: self.setShadowPen(kargs['shadowPen']) if 'fillLevel' in kargs and kargs['fillLevel'] is not None: self.setFillLevel(kargs['fillLevel']) if 'fillOutline' in kargs: self.opts['fillOutline'] = kargs['fillOutline'] if 'brush' in kargs and kargs['brush'] is not None: self.setBrush(kargs['brush']) if 'antialias' in kargs: self.opts['antialias'] = kargs['antialias'] self.opts['skipFiniteCheck'] = kargs.get('skipFiniteCheck', False) profiler('set') self.update() profiler('update') self.sigPlotChanged.emit(self) profiler('emit') @staticmethod def _generateStepModeData(stepMode, x, y, fillLevel): ## each value in the x/y arrays generates 2 points. if stepMode == "right": x2 = np.empty((len(x) + 1, 2), dtype=x.dtype) x2[:-1] = x[:, np.newaxis] x2[-1] = x2[-2] elif stepMode == "left": x2 = np.empty((len(x) + 1, 2), dtype=x.dtype) x2[1:] = x[:, np.newaxis] x2[0] = x2[1] elif stepMode in ("center", True): ## support True for back-compat x2 = np.empty((len(x),2), dtype=x.dtype) x2[:] = x[:, np.newaxis] else: raise ValueError("Unsupported stepMode %s" % stepMode) if fillLevel is None: x = x2.reshape(x2.size)[1:-1] y2 = np.empty((len(y),2), dtype=y.dtype) y2[:] = y[:,np.newaxis] y = y2.reshape(y2.size) else: ## If we have a fill level, add two extra points at either end x = x2.reshape(x2.size) y2 = np.empty((len(y)+2,2), dtype=y.dtype) y2[1:-1] = y[:,np.newaxis] y = y2.reshape(y2.size)[1:-1] y[0] = fillLevel y[-1] = fillLevel return x, y def generatePath(self, x, y): if self.opts['stepMode']: x, y = self._generateStepModeData( self.opts['stepMode'], x, y, self.opts['fillLevel'] ) return fn.arrayToQPath( x, y, connect=self.opts['connect'], finiteCheck=not self.opts['skipFiniteCheck'] ) def getPath(self): if self.path is None: x,y = self.getData() if x is None or len(x) == 0 or y is None or len(y) == 0: self.path = QtGui.QPainterPath() else: self.path = self.generatePath(*self.getData()) self.fillPath = None self._mouseShape = None return self.path def _shouldUseDrawLineSegments(self, pen): return ( pen.widthF() > 1.0 # non-solid pen styles need single polyline to be effective and pen.style() == QtCore.Qt.PenStyle.SolidLine # segmenting the curve slows gradient brushes, and is expected # to do the same for other patterns and pen.isSolid() # pen.brush().style() == Qt.BrushStyle.SolidPattern # ends of adjacent line segments overlapping is visible when not opaque and pen.color().alphaF() == 1.0 ) def _getLineSegments(self): if not hasattr(self, '_lineSegments'): self._lineSegments = LineSegments() if self._renderSegmentList is None: x, y = self.getData() if self.opts['stepMode']: x, y = self._generateStepModeData( self.opts['stepMode'], x, y, self.opts['fillLevel'] ) self._renderSegmentList = self._lineSegments.arrayToLineSegments( x, y, connect=self.opts['connect'], finiteCheck=not self.opts['skipFiniteCheck'] ) return self._renderSegmentList @debug.warnOnException ## raising an exception here causes crash def paint(self, p, opt, widget): profiler = debug.Profiler() if self.xData is None or len(self.xData) == 0: return if getConfigOption('enableExperimental'): if HAVE_OPENGL and isinstance(widget, QtWidgets.QOpenGLWidget): self.paintGL(p, opt, widget) return x = None y = None if self._exportOpts is not False: aa = self._exportOpts.get('antialias', True) else: aa = self.opts['antialias'] p.setRenderHint(p.RenderHint.Antialiasing, aa) cmode = self.opts['compositionMode'] if cmode is not None: p.setCompositionMode(cmode) if self.opts['brush'] is not None and self.opts['fillLevel'] is not None: if self.fillPath is None: if x is None: x,y = self.getData() p2 = QtGui.QPainterPath(self.getPath()) if self.opts['fillLevel'] != 'enclosed': p2.lineTo(x[-1], self.opts['fillLevel']) p2.lineTo(x[0], self.opts['fillLevel']) p2.lineTo(x[0], y[0]) p2.closeSubpath() self.fillPath = p2 profiler('generate fill path') p.fillPath(self.fillPath, self.opts['brush']) profiler('draw fill path') # Avoid constructing a shadow pen if it's not used. if self.opts.get('shadowPen') is not None: if isinstance(self.opts.get('shadowPen'), QtGui.QPen): sp = self.opts['shadowPen'] else: sp = fn.mkPen(self.opts['shadowPen']) if sp.style() != QtCore.Qt.PenStyle.NoPen: p.setPen(sp) if self._shouldUseDrawLineSegments(sp): p.drawLines(self._getLineSegments()) else: p.drawPath(self.getPath()) if isinstance(self.opts.get('pen'), QtGui.QPen): cp = self.opts['pen'] else: cp = fn.mkPen(self.opts['pen']) p.setPen(cp) if self.opts['fillOutline'] and self.fillPath is not None: p.drawPath(self.fillPath) elif self._shouldUseDrawLineSegments(cp): p.drawLines(self._getLineSegments()) else: p.drawPath(self.getPath()) profiler('drawPath') def paintGL(self, p, opt, widget): p.beginNativePainting() import OpenGL.GL as gl if sys.platform == 'win32': # If Qt is built to dynamically load OpenGL, then the projection and # modelview matrices are not setup. # https://doc.qt.io/qt-6/windows-graphics.html # https://code.woboq.org/qt6/qtbase/src/opengl/qopenglpaintengine.cpp.html # Technically, we could enable it for all platforms, but for now, just # enable it where it is required, i.e. Windows gl.glMatrixMode(gl.GL_PROJECTION) gl.glLoadIdentity() gl.glOrtho(0, widget.width(), widget.height(), 0, -999999, 999999) gl.glMatrixMode(gl.GL_MODELVIEW) gl.glLoadMatrixf(QtGui.QMatrix4x4(self.sceneTransform()).data()) ## set clipping viewport view = self.getViewBox() if view is not None: rect = view.mapRectToItem(self, view.boundingRect()) #gl.glViewport(int(rect.x()), int(rect.y()), int(rect.width()), int(rect.height())) #gl.glTranslate(-rect.x(), -rect.y(), 0) gl.glEnable(gl.GL_STENCIL_TEST) gl.glColorMask(gl.GL_FALSE, gl.GL_FALSE, gl.GL_FALSE, gl.GL_FALSE) # disable drawing to frame buffer gl.glDepthMask(gl.GL_FALSE) # disable drawing to depth buffer gl.glStencilFunc(gl.GL_NEVER, 1, 0xFF) gl.glStencilOp(gl.GL_REPLACE, gl.GL_KEEP, gl.GL_KEEP) ## draw stencil pattern gl.glStencilMask(0xFF) gl.glClear(gl.GL_STENCIL_BUFFER_BIT) gl.glBegin(gl.GL_TRIANGLES) gl.glVertex2f(rect.x(), rect.y()) gl.glVertex2f(rect.x()+rect.width(), rect.y()) gl.glVertex2f(rect.x(), rect.y()+rect.height()) gl.glVertex2f(rect.x()+rect.width(), rect.y()+rect.height()) gl.glVertex2f(rect.x()+rect.width(), rect.y()) gl.glVertex2f(rect.x(), rect.y()+rect.height()) gl.glEnd() gl.glColorMask(gl.GL_TRUE, gl.GL_TRUE, gl.GL_TRUE, gl.GL_TRUE) gl.glDepthMask(gl.GL_TRUE) gl.glStencilMask(0x00) gl.glStencilFunc(gl.GL_EQUAL, 1, 0xFF) try: x, y = self.getData() pos = np.empty((len(x), 2)) pos[:,0] = x pos[:,1] = y gl.glEnableClientState(gl.GL_VERTEX_ARRAY) try: gl.glVertexPointerf(pos) pen = fn.mkPen(self.opts['pen']) gl.glColor4f(*pen.color().getRgbF()) width = pen.width() if pen.isCosmetic() and width < 1: width = 1 gl.glPointSize(width) gl.glLineWidth(width) # enable antialiasing if requested if self._exportOpts is not False: aa = self._exportOpts.get('antialias', True) else: aa = self.opts['antialias'] if aa: gl.glEnable(gl.GL_LINE_SMOOTH) gl.glEnable(gl.GL_BLEND) gl.glBlendFunc(gl.GL_SRC_ALPHA, gl.GL_ONE_MINUS_SRC_ALPHA) gl.glHint(gl.GL_LINE_SMOOTH_HINT, gl.GL_NICEST) else: gl.glDisable(gl.GL_LINE_SMOOTH) gl.glDrawArrays(gl.GL_LINE_STRIP, 0, int(pos.size / pos.shape[-1])) finally: gl.glDisableClientState(gl.GL_VERTEX_ARRAY) finally: p.endNativePainting() def clear(self): self.xData = None ## raw values self.yData = None self._renderSegmentList = None self.path = None self.fillPath = None self._mouseShape = None self._mouseBounds = None self._boundsCache = [None, None] #del self.xData, self.yData, self.xDisp, self.yDisp, self.path
[docs] def mouseShape(self): """ Return a QPainterPath representing the clickable shape of the curve """ if self._mouseShape is None: view = self.getViewBox() if view is None: return QtGui.QPainterPath() stroker = QtGui.QPainterPathStroker() path = self.getPath() path = self.mapToItem(view, path) stroker.setWidth(self.opts['mouseWidth']) mousePath = stroker.createStroke(path) self._mouseShape = self.mapFromItem(view, mousePath) return self._mouseShape
def mouseClickEvent(self, ev): if not self.clickable or ev.button() != QtCore.Qt.MouseButton.LeftButton: return if self.mouseShape().contains(ev.pos()): ev.accept() self.sigClicked.emit(self, ev)
class ROIPlotItem(PlotCurveItem): """Plot curve that monitors an ROI and image for changes to automatically replot.""" def __init__(self, roi, data, img, axes=(0,1), xVals=None, color=None): self.roi = roi self.roiData = data self.roiImg = img self.axes = axes self.xVals = xVals PlotCurveItem.__init__(self, self.getRoiData(), x=self.xVals, color=color) #roi.connect(roi, QtCore.SIGNAL('regionChanged'), self.roiChangedEvent) roi.sigRegionChanged.connect(self.roiChangedEvent) #self.roiChangedEvent() def getRoiData(self): d = self.roi.getArrayRegion(self.roiData, self.roiImg, axes=self.axes) if d is None: return while d.ndim > 1: d = d.mean(axis=1) return d def roiChangedEvent(self): d = self.getRoiData() self.updateData(d, self.xVals)