UIKit CGAffineTransform

Discussion in 'iOS Development' started by oppasiliconvalleystyle, Oct 24, 2016.

  1. Does anybody understand the math behind affine transforms? Can you give me a pointer to a good resource that will help me understand it at a deeper level?

    The transformation matrices are multiplied in the opposite order it seems like they should be:

    CGAffineTransform transform = CGAffineTransformMakeTranslation(tx, ty);
    transform = CGAffineTransformScale(transform, sx, sy);
    self.view.transform = transform; 
    If T is the translation matrix and S is the scale matrix, then each point v is translated as (v x S x T). Shouldn't it be translated as (v x T x S)? I can see by testing some points that the latter produces the wrong result. But why?
  2. damponting44

    damponting44 Banned

    I didn't get question ..?

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