how to control the bitmap rotate base on the touch position?


  1. grostcar

    grostcar New Member

    how to control the bitmap rotate base on the touch position?

    my program like http://androidforums.com/application-development/50507-rotate-text-touch.html

    the bitmap needle at the center, the user touch different position, the bitmap will rotate and point to the touch position. the bitmap not move, only rotate.

    how can i make it??
    how can i calculate the coordinate degree?

    i need this technology for my homework,thank you.

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