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Asked: 2026-05-27T16:01:20+00:00

I am writing an iphone game using cocos2d and box2d engines. I have a

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I am writing an iphone game using cocos2d and box2d engines.
I have a ball which can be jumped by tapping the screen. The jump is applied by using ApplyImpulse method on the ball’s body.

Thing is I do not want the ball to jump more than once. (i.e. If the ball is in mid-air I do not want it to be jumped again when tapping the screen.)

Is there a way to know when an object is in mid-air ?
Is there a common solution to this problem ?

Thanks

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1 Answer

  1. Editorial Team

    You can raycast from the center of the ball, downwards. If it collides with anything at a distance greater than the ball’s radius, that means it is in the air.

    To raycast, check chapter 10 in the manual here:
    http://box2d.org/manual.pdf

    It’s in c++ but you should find similar examples in objective-c.

    Hope it helps.

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