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

Discussion in 'Application Development' started by grostcar, Sep 27, 2010.

  1. grostcar

    grostcar New Member
    Thread Starter
    5

    Sep 21, 2010
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    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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