pyqtgraph/graphicsItems/ArrowItem.py

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