矩形和圆碰撞检测 [英] Rectangle and Circle collision detection

问题描述

我想在一个矩形和一个圆之间进行碰撞检测。我想出了这个方法：

   - （BOOL）isCollidingRect：（CCSprite *）spriteOne WithSphere：（CCSprite *）spriteTwo { 
 float diff = ccpDistance（spriteOne.position，spriteTwo.position）; 
 float obj1Radii = [spriteOne boundingBox] .size.width / 2; 
 float obj2Radii = [spriteTwo boundingBox] .size.width / 2; 
 if（diff< obj1Radii + obj2Radii）{
 return YES; 
} else {
 return NO; 
} 
} 
  

这是我如何检查：

  if（[self isCollidingRect：player WithSphere：blocker] == true）{
 [self playerdeathstart]; 
} 
  

这似乎在矩形的一边正常工作，高于或低于它。在顶部和底部，碰撞发生得太早。

有没有办法得到这种碰撞检测正确？感谢您的帮助。

解决方案

您可以使用 CGRectIntersectsRect 实现此目的。

<$ c $ p> - （BOOL）isCollidingRect：（CCSprite *）spriteOne WithSphere：（CCSprite *）spriteTwo {
return CGRectIntersectsRect（[spriteOne boundingBox]，[spriteTwo boundingBox ]）;
}


这不是像素完美，但是我知道在这种情况下不是必需的。

I am trying to do collision detection between a rectangle and a circle. I came up with this method:

-(BOOL) isCollidingRect:(CCSprite *) spriteOne WithSphere:(CCSprite *) spriteTwo {
    float diff = ccpDistance(spriteOne.position, spriteTwo.position);
    float obj1Radii = [spriteOne boundingBox].size.width/2;
    float obj2Radii = [spriteTwo boundingBox].size.width/2;
    if (diff < obj1Radii + obj2Radii) {
        return YES;
    } else {
        return NO;
    }
}

and this is how I check it:

if ([self isCollidingRect:player WithSphere:blocker] == true) {
   [self playerdeathstart];
}

This seems to work properly on the side of the rectangle but it doesn't above or below it. On the top and bottom, the collision occurs too early.

Is there a way I can get this collision to detected properly? Thank you for your help.

解决方案

You can use CGRectIntersectsRect to achieve this.

-(BOOL) isCollidingRect:(CCSprite *) spriteOne WithSphere:(CCSprite *) spriteTwo {
    return CGRectIntersectsRect([spriteOne boundingBox],[spriteTwo boundingBox]);
}

It is not pixel perfect but as i understand that is not necessary in this case.

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