Question

我有这个游戏，我需要知道球是否已击中侧面的墙壁（在x轴上反弹）或在顶部（在y轴上反弹，就像反弹一样）地面）。它们单独工作很好，但是当我取消它们两者时，它就不起作用了。（我认为这是因为代码'重叠'？）。无论如何，这里是代码，任何帮助都很棒：

if (CGRectIntersectsRect(guy.frame, wall_01.frame)) {
            if (guy.frame.origin.y+guy.frame.size.height >= wall_01.frame.origin.y && guy.frame.origin.y <= wall_01.frame.origin.y+wall_01.frame.size.height) {
                iJump *= kRestitution;
            }
            if (guy.frame.origin.x+guy.frame.size.width >= wall_01.frame.origin.x && guy.frame.origin.x <= wall_01.frame.origin.x+wall_01.frame.size.width) {
                jJump *= kRestitution;
            }
        }

Answer 1

假设墙在左侧，y从顶部到底部增加

CGFloat leftWall = someXPosition;
CGFloat ground = someYPosition;


CGFloat ballLeft = CGRectGetMinX(guy.frame);
CGFloat ballRight = CGRectGetMaxX(guy.frame);
CGFloat ballBottom = CGRectGetMaxY(guy.frame);

if (ballLeft <= leftwall && ballBot >= ground){
   //ball hit corner ?

} else if (ballLeft <= leftWall){
   //passed or touched wall

} else if (ballBot >= ground){
   //passed or touched ground
}

方形碰撞检测iPhone

1 个答案: