def __init__(self, scene):
self.lineItem = GraphicsLine()
self.lineItem.hide()
self.start = None
self.end = None
scene.addItem(self.lineItem)
class PointerTrackGhost(object):
"""
A ghost for freehand drawing.
Line between current PointerPosition and last PointerTrack path segment generated, which lags.
Finally replaced by a path segment.
Hidden when user not using freehand tool.
"""
def __init__(self, scene):
self.lineItem = GraphicsLine()
self.lineItem.hide()
self.start = None
self.end = None
scene.addItem(self.lineItem)
def showAt(self, initialPosition):
self.start = initialPosition
self.end = initialPosition
self.lineItem.setLine(QLineF(self.start, self.end))
self.lineItem.show()
def updateStart(self, point):
self.start = point
self.lineItem.setLine(QLineF(self.start, self.end))
def updateEnd(self, point):
self.end = point
self.lineItem.setLine(QLineF(self.start, self.end))
def hide(self, point):
self.lineItem.hide()