使用花栗鼠物理学 - 我如何知道两个碰撞物体的力

发布于 2024-08-30 06:23:25 字数 832 浏览 4 评论 0原文

如果我在花栗鼠中有两个物体（我使用的是 cocos2d-iphone），一旦我检测到它们发生碰撞，我如何知道它们彼此碰撞的力度有多大？

我希望他们的力（相对于速度）知道碰撞的损坏。

我见过关于如何做到这一点的讨论，但从未见过具体的工作代码（而且我无法让它工作，即使我认为我知道我在做什么。）为了完整起见，这里是我用来确定碰撞的速度，那么，我该如何准确地检测碰撞的力呢？

- (BOOL) handleCollisionBetweenBalls:(CollisionMoment)moment arbiter:(cpArbiter*)arb space:(cpSpace*)space {
  JjrFootprint(@"handleCollisionBetweenBalls");
    if (moment == COLLISION_BEGIN) {
    JjrLog(@"Balls Collide");
    CP_ARBITER_GET_SHAPES(arb, a, b);
    cpVect va;
    cpVect vb;
    va = a->body->v;
    vb = b->body->v;
    cpVect vNet = cpvadd(va,vb);
    cpFloat Length = cpvlength(vNet);
    // 7 = barely touching
    // 1000 = hard
    if (Length > 100) {
      [[SimpleAudioEngine sharedEngine] playEffect:@"board.wav"];
    }
  }
    return YES;
}

谢谢，杰杰

原文

If I have two objects in chipmunk (I'm using cocos2d-iphone), once I've detected that they collided, how can I tell how hard they are hitting each other?

I want their force (vs. the velocity) to know the damage of the collision.

I've seen discussion about how to do this, but never concrete working code (and I couldn't get it work, even though I thought I knew what I was doing.) For completeness, here is the code that I am using to determine the Velocity of the collision, so, how, precisely, would I go about detecting the Force of a collision?

- (BOOL) handleCollisionBetweenBalls:(CollisionMoment)moment arbiter:(cpArbiter*)arb space:(cpSpace*)space {
  JjrFootprint(@"handleCollisionBetweenBalls");
    if (moment == COLLISION_BEGIN) {
    JjrLog(@"Balls Collide");
    CP_ARBITER_GET_SHAPES(arb, a, b);
    cpVect va;
    cpVect vb;
    va = a->body->v;
    vb = b->body->v;
    cpVect vNet = cpvadd(va,vb);
    cpFloat Length = cpvlength(vNet);
    // 7 = barely touching
    // 1000 = hard
    if (Length > 100) {
      [[SimpleAudioEngine sharedEngine] playEffect:@"board.wav"];
    }
  }
    return YES;
}

Thanks,
JJ

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