How to calculate translate while zooming in WPF/Surface?

I had to do exactly this myself. Basically, a Surface control that can host arbitrary content and allow the user to pan and zoom (using gestures). The handler for my maniplation processor's Affine2DManipulationDelta is shown below.

Hopefully it's fairly self-explanatory and gets you where you need to be.

Here is my implementation that ended up working just fine.

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