cocos碰撞检测

        // 两个矩形的碰撞检测，主要看boundingbox是否接触

        Rect rc1 =_spriteAuto->getBoundingBox();

        Rect rc2 =_spriteCtrl->getBoundingBox();

        if(rc1.intersectsRect(rc2))则认为碰撞

 

        // 两个圆的碰撞检测，看圆心距离

        Point pt1 =_spriteAuto->getPosition();

        Point pt2 =_spriteCtrl->getPosition();

        Rect rc1 =_spriteAuto->getBoundingBox();

        Rect rc2 =_spriteCtrl->getBoundingBox();

        float r2 = rc1.size.width/ 2 + rc2.size.width / 2;

 

        float dist =pt2.getDistanceSq(pt1);

        if (dist < r2*r2)则认为碰撞

 

           

碰撞的高效算法：将矩形分块，只判定个块的情况，要比整个的好一些（防止连续碰撞）。

总结：矩形和矩形(Rect::intersectsRect(Rect))

          矩形和圆(Rect::intersectsCircle(Vec2-圆心，float-半径))

      矩形和点(Rect::containsPoint(Vec2))

      点和圆：圆心半径距离
          圆和圆：圆心半径是否小于半径之和

      线段：ccpSegmentIntersect（）参数是4个Vec2，表示2个线段