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Asked: 2026-05-12T17:19:22+00:00

I’m making a game in c++. It is a card game. I have made

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I’m making a game in c++. It is a card game. I have made 13 cards that rotate about a point to arc out to make your hand. I need a way to figure out which card the user clicks on. My cards are basically rectangles rotated about a point that is in the center of the cards. I was thinking of maybe getting the mouse point and rotating it about my central point but i’m not sure how to rotate a point about a point. Thanks.

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1 Answer

  1. Editorial Team

    Rotating a around p

    The trick is to reduce rotating around a point to rotating around the origin by doing translations.

    1. Subtract p from a (move to the origin)
    2. Rotate by angle
    3. Add p to resulting point (move again)

    Formula for rotating (x, y) aroung the origin:

    alt text

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