In my game I want a building to build by first only showing the bottom row of the image, then the next and progressively reveal the image upwards. I can do that, but when the image is finished and I move to a regular draw the image will jump to another position of the map! I've tried subtracting half the image's height (in case it's the midhandle), disabling the midhandle completely and other trial and error but I cannot get it to work right for all image sizes and it also needs to take into account scale to boot.
p is the level of build progress, from 0.0 to 1.0. The first line of the method just adds on any kind of offset there might be to an image. I'm testing on images with 0, 0 offset so it can't be the problem (pos is unchanged).
Method draw(pos:TVec2, frame, scale:Float)
pos = pos.Add(_pivot.Scal(scale))
DrawImage _image, pos.x, pos.y, frame
End Method
Method draw_rect(pos:TVec2, frame, scale:Float, p:Float)
pos = pos.Add(_pivot.Scal(scale))
Local i = ImageHeight(_image)
DrawSubImageRect (_image, pos.x, pos.y, i, i, 0, i-i*p, i, i, 0, i*p, frame)
End Method
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