How to get tap location on world coordinate?

Can we be known of wher开发者_JAVA技巧e we have tapped(touched once) on a box2d world. As, location = [self convertCoordToLayer:location]; location.x,location.y returns screen coordinate. So is there any method to get world coordinate?

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That depends on how you correlate your physical world and the graphics. Usually it's enough to divide the touch position relative to the layer by PTM_RATIO:

    CGPoint touchLocation = [touch locationInView:[touch view]];
    touchLocation = [[CCDirector sharedDirector] convertToGL:touchLocation];
    CGPoint nodePosition = [self convertToNodeSpace: touchLocation];
    b2Vec2 pos(nodePosition.x/PTM_RATIO, nodePosition.y/PTM_RATIO);