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from PyQt4 import QtCore
class Guide(object):
def __init__(self, follows=None):
self.scaleX = 1.0
self.scaleY = 1.0
if follows is not None:
while follows.nextGuide is not follows.firstGuide:
follows = follows.nextGuide
follows.nextGuide = self
self.prevGuide = follows
self.firstGuide = follows.firstGuide
self.nextGuide = follows.firstGuide
self.startLength = int(follows.startLength + follows.length()) + 1
else:
self.prevGuide = self
self.firstGuide = self
self.nextGuide = self
self.startLength = 0
def setScale(self, scaleX, scaleY, all=True):
self.scaleX = scaleX
self.scaleY = scaleY
if all:
next = self.nextGuide
while next is not self:
next.scaleX = scaleX
next.scaleY = scaleY
next = next.nextGuide
def setFence(self, fence, all=True):
self.fence = fence
if all:
next = self.nextGuide
while next is not self:
next.fence = fence
next = next.nextGuide
def lengthAll(self):
len = self.length()
next = self.nextGuide
while next is not self:
len += next.length()
next = next.nextGuide
return len
def move(self, item, dest, moveSpeed):
walkLine = QtCore.QLineF(item.getGuidedPos(), dest)
if moveSpeed >= 0 and walkLine.length() > moveSpeed:
# The item is too far away from it's destination point so we move
# it towards it instead.
dx = walkLine.dx()
dy = walkLine.dy()
if abs(dx) > abs(dy):
# Walk along x-axis.
if dx != 0:
d = moveSpeed * dy / abs(dx)
if dx > 0:
s = moveSpeed
else:
s = -moveSpeed
dest.setX(item.getGuidedPos().x() + s)
dest.setY(item.getGuidedPos().y() + d)
else:
# Walk along y-axis.
if dy != 0:
d = moveSpeed * dx / abs(dy)
if dy > 0:
s = moveSpeed
else:
s = -moveSpeed
dest.setX(item.getGuidedPos().x() + d)
dest.setY(item.getGuidedPos().y() + s)
item.setGuidedPos(dest)
def startPos(self):
return QtCore.QPointF(0, 0)
def endPos(self):
return QtCore.QPointF(0, 0)
def length(self):
return 1.0
def guide(self, item, moveSpeed):
raise NotImplementedError
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