Hi,
I'm plotting lines on top of an image using the plot command, trying to make
polygons. I click one point on an image and another point, and a line is
drawn between them. I'm also showing a guide line, so that the user can see
the line before pressing the mouse button.. All i'm doing is taking the last
point that the user clicked on and plot a line between that point and the
current point under the mouse cursor. New chosen points are appended to
nPolygonPointsX and Y. This works ok, but it's a bit slow.
my update connected to the motion_notify_event looks like this:
------------------------------------------------------------------------------
def onCursorUpdate(self, event)
x, y = event.xdata, event.ydata
a = self.fig.gca()
if len(self.nPolygonPointsX >= 1):
guideLineX = [self.nPolygonPointsX[-1], x]
guideLineY = [self.nPolygonPointsY[-1], y]
# To avoid keeping guide lines when the cursor is moved:
if len(a.lines) > 1:
del(a.lines[-1])
# Plot the guide line and update
a.plot(guideLineX, guideLineY)
self.canvas.draw()
------------------------------------------------------------------------------
Btw i'm running matplotlib with wxpython. So is there a faster way to update
this line plot? ..
Thanks!
Soren
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