Cuts a new RenderTextureQuad out of this RenderTextureQuad. The offset
of the new RenderTextureQuad will be adjusted to match the origin of
the rectangle.
The rectangle is in target coordinates. Those coordinates take the
pixelRatio into account. Please read more about HiDpi textures to
learn more about this topic.
Source
RenderTextureQuad cut(Rectangle<num> rectangle) {
int rL = (rectangle.left * pixelRatio).round();
int rT = (rectangle.top * pixelRatio).round();
int rR = (rectangle.right * pixelRatio).round();
int rB = (rectangle.bottom * pixelRatio).round();
var sourceRectangle = new Rectangle<int>(rL, rT, rR - rL, rB - rT);
var offsetRectangle = new Rectangle<int>(0, 0, rR - rL, rB - rT);
return new RenderTextureQuad.slice(this, sourceRectangle, offsetRectangle);
}