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I am developing a game using COCOS2D. In my game, there are 4 points, each point is connected with each other by one line. When user moves the point, the lines move with the point. At the time of moving, if a line intersects with another line, line color should become red. How can I do this, i.e. line to colored red? And how to detect the intersection of two lines? Can anyone help me to solve this intersection problem in COCOS2D?

CodeSmile
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triveni
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  • Please fix your formatting - you obviously speak decent English, so there is no excise for your spelling and gramatical abominations. – jrtc27 Nov 10 '11 at 07:13
  • @jrtc27: s/excise/excuse/ ;-P But I agree, a little bit more effort in providing a good question can be expected. – DarkDust Nov 10 '11 at 07:19

2 Answers2

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You can detect whether 2 segments intersect using this function provided by cocos2d.

BOOL ccpSegmentIntersect(CGPoint A, CGPoint B, CGPoint C, CGPoint D)

Luca Angeletti
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There's a question that could be considered a duplicate of your question but it's more generic:

How do you detect where two line segments intersect?

It has a few nice algorithms, though the answer that might be the most useful for you is the answer from Gavin as it provides a C function that you can easily adapt.

Community
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DarkDust
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