Advanced methods to draw image parts to canvas

[projectitis]

Hi all,

I am trying to efficiently draw many part-images to a canvas, scaled differently in X and Y (including -ve scale, to flip it)
I have partial solutions, but none are quite right:

• Loop each part, and use canvas.drawImageRect
  • This will stretch each part correctly
  • But only +ve scale is supported (cannot flip)
  • And is inefficient because need to loop each part
• Use canvas.drawAtlas to draw all at once
  • More efficient
  • Support -ve scale
  • But requires a uniform scale and does not support stretching differently in X and Y

Any ideas?

[spydon]

Not a solution, just a comment; you can do flips for the first solution if you do canvas.save() and canvas.scale(-1) before the drawImageRect call and then canvas.restore() afterwards.

Since RSTransform only supports uniform scale I don't think that you'll be able to do it with drawAtlas.

[projectitis]

Yup, that's my conclusion.
My current implementation uses drawImageRect.
I had a doh! moment and realized I could use canvas transforms to achieve -ve scale, but haven't added that yet.