On Mon, Feb 3, 2014 at 1:15 PM, Nouvelle Collection <
[email protected]> wrote:
> self.Canvas.AddScaledBitmap(image, (0,0), Height=image.GetHeight(),
> Position = 'tl')
>
>
hmm -- this will create a ScaledBitmap with "world" height of 100 pixels.
> When I use a PNG of size (x,y) with x <= 100 or y <=100, I have a crash
> with the following traceback when I do ZoomToBB() :
>
> Traceback (most recent call last):
>>>> File "D:\Documents\test.py", line 471, in Draw
>>>> self.Canvas.ZoomToBB()
>>>> File "D:\Documents\floatcanvas\FloatCanvas.py", line 3035, in ZoomToBB
>>>> self.SetToNewScale(DrawFlag=DrawFlag)
>>>> File "D:\Documents\floatcanvas\FloatCanvas.py", line 3048, in
>>>> SetToNewScale
>>>> self.Draw()
>>>> File "D:\Documents\floatcanvas\FloatCanvas.py", line 2846, in Draw
>>>> self._DrawObjects(dc, self._DrawList, ScreenDC, self.ViewPortBB,
>>>> HTdc)
>>>> File "D:\Documents\floatcanvas\FloatCanvas.py", line 3186, in
>>>> _DrawObjects
>>>> Object._Draw(dc, WorldToPixel, ScaleWorldToPixel, HTdc)
>>>> File "D:\Documents\floatcanvas\FloatCanvas.py", line 1968, in _Draw
>>>> Img = self.Image.Scale(W, H)
>>>> File
>>>> "C:\ProgramData\Anaconda\lib\site-packages\wx-3.0-msw\wx\_core.py", line
>>>> 2916, in Scale
>>>> return _core_.Image_Scale(*args, **kwargs)
>>>> wx._core.PyAssertionError: C++ assertion "(width > 0) && (height > 0)"
>>>> failed at ..\..\src\common\image.cpp(433) in wxImage::Scale(): invalid new
>>>> image size
>>>>
>>>
> Do you have any idea for the reason of this error ?
>
One idea -- what else is on the canvas -- if everything else if big enough
(or far enough away) so that zooming to the bounding box would make the
ScaledBitmap less than 1 pixel in size, then it may be trying to scale to a
0-pixel image, which would trigger this. But I"m surprised that I didn't
already have a check for that.
That should be near here:
File "D:\Documents\floatcanvas\FloatCanvas.py", line 1968, in _Draw
Img = self.Image.Scale(W, H)
look and see if there is check for size-zero for W or H -- if not then
there should be, and it can just skip the rest of the _draw method
-- nothing to draw.
> Note : if I resize (with MSPaint for example) the PNG to 101x101 pixels,
> there is no error anymore..
>
Also, it seems odd that it would happen at exactly 100 pixels -- quite a
round number.
If you post a small sample that breaks and the png that breaks it -- I'll
take a look.
-Chris
--
Christopher Barker, Ph.D.
Oceanographer
Emergency Response Division
NOAA/NOS/OR&R (206) 526-6959 voice
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