android - Bitmap coordinates after canvas.scale -

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i need @ getting correct coordinates when touching canvas.

i have image 1240x1756

the user can scroll around on bitmap. bitmap attached canvas. translating canvas. canvas.translate()

the user can place new bitmap , move anywhere around on canvas. 256x256.

up until point have no problem calculating touch coordinates @ scale factor of 1.0. take screen touch coords , add offset of image , check see if 256x256 moveable bitmap intersects touch coords.

however issue getting correct coordinates after canvas has been scaled. 0.1-1.0 minimum , maximum scaling values.

can point me in right direction working algorithm?

you should able multiply pixel offset 1/scale factor.


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