def pixelLength(self, direction):
"""Return the length of one pixel in the direction indicated (in local coordinates)"""
dt = self.deviceTransform()
if dt is None:
return None
viewDir = Point(dt.map(direction) - dt.map(Point(0,0)))
norm = viewDir.norm()
dti = dt.inverted()[0]
return Point(dti.map(norm)-dti.map(Point(0,0))).length()
def pixelLength(self, direction):
"""Return the length of one pixel in the direction indicated (in local coordinates)"""
dt = self.deviceTransform()
if dt is None:
return None
viewDir = Point(dt.map(direction) - dt.map(Point(0, 0)))
norm = viewDir.norm()
dti = dt.inverted()[0]
return Point(dti.map(norm) - dti.map(Point(0, 0))).length()
def boundingRect(self):
br = UIGraphicsItem.boundingRect(self)
## add a 4-pixel radius around the line for mouse interaction.
#print "line bounds:", self, br
dt = self.deviceTransform()
if dt is None:
return QtCore.QRectF()
lineDir = Point(dt.map(Point(1, 0)) - dt.map(Point(0,0))) ## direction of line in pixel-space
orthoDir = Point(lineDir[1], -lineDir[0]) ## orthogonal to line in pixel-space
try:
norm = orthoDir.norm() ## direction of one pixel orthogonal to line
except ZeroDivisionError:
return br
dti = dt.inverted()[0]
px = Point(dti.map(norm)-dti.map(Point(0,0))) ## orthogonal pixel mapped back to item coords
px = px[1] ## project to y-direction
br.setBottom(-px*4)
br.setTop(px*4)
return br.normalized()
def boundingRect(self):
br = UIGraphicsItem.boundingRect(self)
## add a 4-pixel radius around the line for mouse interaction.
#print "line bounds:", self, br
dt = self.deviceTransform()
if dt is None:
return QtCore.QRectF()
lineDir = Point(dt.map(Point(1, 0)) - dt.map(Point(0,0))) ## direction of line in pixel-space
orthoDir = Point(lineDir[1], -lineDir[0]) ## orthogonal to line in pixel-space
try:
norm = orthoDir.norm() ## direction of one pixel orthogonal to line
except ZeroDivisionError:
return br
dti = dt.inverted()[0]
px = Point(dti.map(norm)-dti.map(Point(0,0))) ## orthogonal pixel mapped back to item coords
px = px[1] ## project to y-direction
br.setBottom(-px*4)
br.setTop(px*4)
return br.normalized()
