I am selecting a group of objects and doing a BB.Merge to get an all
encompassing
Bounding Box. I then paint the containing bounding box to canvas using …
dc = wx.ClientDC(Canvas)
dc.SetPen(wx.Pen('WHITE', 2, wx.DOT))
dc.SetBrush(wx.TRANSPARENT_BRUSH)
dc.SetLogicalFunction(wx.XOR)
OutlinePoints = N.array( ( (BB[0,0], BB[0,1]),
(BB[0,0], BB[1,1]),
(BB[1,0], BB[1,1]),
(BB[1,0], BB[0,1])))
dc.DrawPolygon(Canvas.WorldToPixel(OutlinePoints))
Selecting another item to the group gives a new BB.Merge result. To draw
the new
Polygon to the Canvas I am trying to do a canvas refresh prior to using the
above
code to display the new selection polygon.
The problem is that if a Canvas.Refresh() is placed before the above code or
I
Completely redraw the canvas thereby clearing the old BB.merge polygon, the
new
Polygon does not draw.
Is there a timing or buffer issue in play here ??
NB. If I do not do the refresh or redraw the new polygon is correctly drawn
to canvas
however the original polygon is also still shown, which is undesirable.
Thoughts anyone?
David
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