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Added some documentation for ArrowItem

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This commit is contained in:
Luke Campagnola 2013-02-10 14:12:56 -05:00
parent 0158e015e9
commit 510b1b3fad
1 changed files with 30 additions and 0 deletions
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30
pyqtgraph/graphicsItems/ArrowItem.py
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@ -12,6 +12,10 @@ class ArrowItem(QtGui.QGraphicsPathItem):
def __init__(self, **opts):
"""
Arrows can be initialized with any keyword arguments accepted by
the setStyle() method.
"""
QtGui.QGraphicsPathItem.__init__(self, opts.get('parent', None))
if 'size' in opts:
opts['headLen'] = opts['size']
@ -40,6 +44,32 @@ class ArrowItem(QtGui.QGraphicsPathItem):
self.moveBy(*self.opts['pos'])
def setStyle(self, **opts):
"""
Changes the appearance of the arrow.
All arguments are optional:
================= =================================================
Keyword Arguments
angle Orientation of the arrow in degrees. Default is
0; arrow pointing to the left.
headLen Length of the arrow head, from tip to base.
default=20
headWidth Width of the arrow head at its base.
tipAngle Angle of the tip of the arrow in degrees. Smaller
values make a 'sharper' arrow. If tipAngle is
specified, ot overrides headWidth. default=25
baseAngle Angle of the base of the arrow head. Default is
0, which means that the base of the arrow head
is perpendicular to the arrow shaft.
tailLen Length of the arrow tail, measured from the base
of the arrow head to the tip of the tail. If
this value is None, no tail will be drawn.
default=None
tailWidth Width of the tail. default=3
pen The pen used to draw the outline of the arrow.
brush The brush used to fill the arrow.
================= =================================================
"""
self.opts = opts
opt = dict([(k,self.opts[k]) for k in ['headLen', 'tipAngle', 'baseAngle', 'tailLen', 'tailWidth']])