57 lines
1.7 KiB
Python
57 lines
1.7 KiB
Python
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from pyqtgraph.Qt import QtGui, QtCore
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import pyqtgraph.functions as fn
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import numpy as np
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__all__ = ['ArrowItem']
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class ArrowItem(QtGui.QGraphicsPathItem):
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"""
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For displaying scale-invariant arrows.
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For arrows pointing to a location on a curve, see CurveArrow
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"""
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def __init__(self, **opts):
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QtGui.QGraphicsPathItem.__init__(self, opts.get('parent', None))
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if 'size' in opts:
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opts['headLen'] = opts['size']
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if 'width' in opts:
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opts['headWidth'] = opts['width']
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defOpts = {
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'pxMode': True,
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'angle': -150, ## If the angle is 0, the arrow points left
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'pos': (0,0),
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'headLen': 20,
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'tipAngle': 25,
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'baseAngle': 0,
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'tailLen': None,
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'tailWidth': 3,
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'pen': (200,200,200),
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'brush': (50,50,200),
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}
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defOpts.update(opts)
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self.setStyle(**defOpts)
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self.setPen(fn.mkPen(defOpts['pen']))
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self.setBrush(fn.mkBrush(defOpts['brush']))
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self.rotate(self.opts['angle'])
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self.moveBy(*self.opts['pos'])
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def setStyle(self, **opts):
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self.opts = opts
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opt = dict([(k,self.opts[k]) for k in ['headLen', 'tipAngle', 'baseAngle', 'tailLen', 'tailWidth']])
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self.path = fn.makeArrowPath(**opt)
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self.setPath(self.path)
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if opts['pxMode']:
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self.setFlags(self.flags() | self.ItemIgnoresTransformations)
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else:
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self.setFlags(self.flags() & ~self.ItemIgnoresTransformations)
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def paint(self, p, *args):
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p.setRenderHint(QtGui.QPainter.Antialiasing)
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QtGui.QGraphicsPathItem.paint(self, p, *args)
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