Corrected mouse clicking on PlotCurveItem - now uses stroke outline instead of path shape
Added 'width' argument to PlotCurveItem.setClickable()
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examples/MouseSelection.py
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37
examples/MouseSelection.py
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@ -0,0 +1,37 @@
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# -*- coding: utf-8 -*-
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"""
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Demonstrates selecting plot curves by mouse click
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"""
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import initExample ## Add path to library (just for examples; you do not need this)
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import pyqtgraph as pg
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from pyqtgraph.Qt import QtCore, QtGui
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import numpy as np
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win = pg.plot()
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win.setWindowTitle('pyqtgraph example: Plot data selection')
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curves = [
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pg.PlotCurveItem(y=np.sin(np.linspace(0, 20, 1000)), pen='r', clickable=True),
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pg.PlotCurveItem(y=np.sin(np.linspace(1, 21, 1000)), pen='g', clickable=True),
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pg.PlotCurveItem(y=np.sin(np.linspace(2, 22, 1000)), pen='b', clickable=True),
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]
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def plotClicked(curve):
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global curves
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for i,c in enumerate(curves):
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if c is curve:
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c.setPen('rgb'[i], width=3)
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else:
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c.setPen('rgb'[i], width=1)
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for c in curves:
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win.addItem(c)
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c.sigClicked.connect(plotClicked)
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## Start Qt event loop unless running in interactive mode or using pyside.
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if __name__ == '__main__':
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import sys
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if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
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QtGui.QApplication.instance().exec_()
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@ -53,9 +53,6 @@ class PlotCurveItem(GraphicsObject):
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"""
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GraphicsObject.__init__(self, kargs.get('parent', None))
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self.clear()
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self.path = None
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self.fillPath = None
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self._boundsCache = [None, None]
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## this is disastrous for performance.
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#self.setCacheMode(QtGui.QGraphicsItem.DeviceCoordinateCache)
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@ -70,6 +67,7 @@ class PlotCurveItem(GraphicsObject):
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'name': None,
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'antialias': pg.getConfigOption('antialias'),\
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'connect': 'all',
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'mouseWidth': 8, # width of shape responding to mouse click
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}
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self.setClickable(kargs.get('clickable', False))
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self.setData(*args, **kargs)
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@ -80,9 +78,17 @@ class PlotCurveItem(GraphicsObject):
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return ints
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return interface in ints
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def setClickable(self, s):
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"""Sets whether the item responds to mouse clicks."""
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def setClickable(self, s, width=None):
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"""Sets whether the item responds to mouse clicks.
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The *width* argument specifies the width in pixels orthogonal to the
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curve that will respond to a mouse click.
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"""
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self.clickable = s
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if width is not None:
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self.opts['mouseWidth'] = width
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self._mouseShape = None
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self._boundingRect = None
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def getData(self):
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@ -148,6 +154,8 @@ class PlotCurveItem(GraphicsObject):
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w += pen.widthF()*0.7072
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if spen is not None and spen.isCosmetic() and spen.style() != QtCore.Qt.NoPen:
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w = max(w, spen.widthF()*0.7072)
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if self.clickable:
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w = max(w, self.opts['mouseWidth']//2 + 1)
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return w
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def boundingRect(self):
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@ -171,6 +179,7 @@ class PlotCurveItem(GraphicsObject):
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#px += self._maxSpotWidth * 0.5
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#py += self._maxSpotWidth * 0.5
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self._boundingRect = QtCore.QRectF(xmn-px, ymn-py, (2*px)+xmx-xmn, (2*py)+ymx-ymn)
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return self._boundingRect
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def viewTransformChanged(self):
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@ -328,6 +337,7 @@ class PlotCurveItem(GraphicsObject):
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self.path = None
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self.fillPath = None
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self._mouseShape = None
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#self.xDisp = self.yDisp = None
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if 'name' in kargs:
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@ -376,12 +386,14 @@ class PlotCurveItem(GraphicsObject):
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return path
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def shape(self):
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def getPath(self):
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if self.path is None:
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try:
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self.path = self.generatePath(*self.getData())
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except:
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x,y = self.getData()
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if x is None or len(x) == 0 or y is None or len(y) == 0:
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return QtGui.QPainterPath()
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self.path = self.generatePath(*self.getData())
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self.fillPath = None
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self._mouseShape = None
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return self.path
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@pg.debug.warnOnException ## raising an exception here causes crash
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@ -396,14 +408,8 @@ class PlotCurveItem(GraphicsObject):
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x = None
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y = None
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if self.path is None:
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x,y = self.getData()
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if x is None or len(x) == 0 or y is None or len(y) == 0:
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return
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self.path = self.generatePath(x,y)
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self.fillPath = None
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path = self.path
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path = self.getPath()
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profiler('generate path')
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if self._exportOpts is not False:
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@ -522,13 +528,36 @@ class PlotCurveItem(GraphicsObject):
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self.xDisp = None ## display values (after log / fft)
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self.yDisp = None
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self.path = None
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self.fillPath = None
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self._mouseShape = None
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self._mouseBounds = None
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self._boundsCache = [None, None]
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#del self.xData, self.yData, self.xDisp, self.yDisp, self.path
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def mouseShape(self):
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"""
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Return a QPainterPath representing the clickable shape of the curve
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"""
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if self._mouseShape is None:
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view = self.getViewBox()
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if view is None:
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return QtGui.QPainterPath()
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stroker = QtGui.QPainterPathStroker()
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path = self.getPath()
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path = self.mapToItem(view, path)
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stroker.setWidth(self.opts['mouseWidth'])
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mousePath = stroker.createStroke(path)
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self._mouseShape = self.mapFromItem(view, mousePath)
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return self._mouseShape
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def mouseClickEvent(self, ev):
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if not self.clickable or ev.button() != QtCore.Qt.LeftButton:
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return
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ev.accept()
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self.sigClicked.emit(self)
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if self.mouseShape().contains(ev.pos()):
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ev.accept()
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self.sigClicked.emit(self)
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class ROIPlotItem(PlotCurveItem):
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