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Add PlotCurveItem composition mode

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This commit is contained in:
Luke Campagnola 2017-09-28 08:57:42 -07:00
parent f627a6a447
commit e885236bd5
1 changed files with 29 additions and 3 deletions
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32
pyqtgraph/graphicsItems/PlotCurveItem.py
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@ -68,6 +68,7 @@ class PlotCurveItem(GraphicsObject):
'antialias': getConfigOption('antialias'),
'connect': 'all',
'mouseWidth': 8, # width of shape responding to mouse click
'compositionMode': None,
}
self.setClickable(kargs.get('clickable', False))
self.setData(*args, **kargs)
@ -93,6 +94,24 @@ class PlotCurveItem(GraphicsObject):
self._mouseShape = None
self._boundingRect = None
def setCompositionMode(self, mode):
"""Change the composition mode of the item (see QPainter::CompositionMode
in the Qt documentation). This is useful when overlaying multiple items.
============================================ ============================================================
**Most common arguments:**
QtGui.QPainter.CompositionMode_SourceOver Default; image replaces the background if it
is opaque. Otherwise, it uses the alpha channel to blend
the image with the background.
QtGui.QPainter.CompositionMode_Overlay The image color is mixed with the background color to
reflect the lightness or darkness of the background.
QtGui.QPainter.CompositionMode_Plus Both the alpha and color of the image and background pixels
are added together.
QtGui.QPainter.CompositionMode_Multiply The output is the image color multiplied by the background.
============================================ ============================================================
"""
self.opts['compositionMode'] = mode
self.update()
def getData(self):
return self.xData, self.yData
@ -274,7 +293,7 @@ class PlotCurveItem(GraphicsObject):
def setData(self, *args, **kargs):
"""
============== ========================================================
=============== ========================================================
**Arguments:**
x, y (numpy arrays) Data to show
pen Pen to use when drawing. Any single argument accepted by
@ -298,7 +317,9 @@ class PlotCurveItem(GraphicsObject):
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>`.
=============== ========================================================
If non-keyword arguments are used, they will be interpreted as
setData(y) for a single argument and setData(x, y) for two
@ -311,6 +332,9 @@ class PlotCurveItem(GraphicsObject):
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:
@ -430,7 +454,6 @@ class PlotCurveItem(GraphicsObject):
x = None
y = None
path = self.getPath()
profiler('generate path')
if self._exportOpts is not False:
@ -440,6 +463,9 @@ class PlotCurveItem(GraphicsObject):
p.setRenderHint(p.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: