Design Element
Comment on "Simple Transforms with Core Image"
by Vickie — Mar 14
I have only ever had success using 'concat' with NSAffineTransform. I find the choice between editing an image or editing the context confusing, I must admit. I don't have any idea what the criteria would be to choose between them.

After you have added all of the desired transformations to the transform object, you call the concat method to apply them to the current context. Calling concat adds your transformations to the CTM of the current graphics context. The modifications stay in effect until you explicitly undo them, as described in “Undoing a Transformation”, or a previous graphics state is restored.

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