The question would be: Can I fill with a transparent color to erase the 
image?

----- Original Message ----- 
From: "Victor Bombi" <[email protected]>
To: "IUP discussion list." <[email protected]>
Sent: Wednesday, January 15, 2014 2:22 PM
Subject: Re: [Iup-users] teselation sample


>I dont understand why both functions behave differently
> One is pasting in a triangle and the other duplicates and deletes outside
> the triangle
> (The second one could be used then to do it in place)
>
> function MaskTriang2(imgor,size)
> local img = imgor:Duplicate()
> local imcv = img:cdCreateCanvas()
> imcv:Begin(cd.REGION)
> imcv:Box(0,img:Width(), 0,img:Height())
> imcv:RegionCombineMode(cd.NOTINTERSECT)
> EQTriangle(imcv,size,cd.FILL)
> imcv:End()
>
> imcv:Clip(cd.CLIPREGION)
> imcv:Foreground(cd.EncodeAlpha(cd.BLACK, 0))
>
> imcv:Box(0,img:Width(), 0,img:Height())
>
> imcv:Kill()
> return img
> end
>
> function MaskTriang(img,size)
> local im2 = img:Clone()
> im2:AddAlpha()
> local imcv = im2:cdCreateCanvas()
> EQTriangle(imcv,size,cd.CLIP)
> imcv:Clip(cd.CLIPPOLYGON)
> img:cdCanvasPutImageRect(imcv, 0, 0, 0, 0, 0, 0, 0, 0)
> imcv:Kill()
> return im2
> end
>
>
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