[英]In box2d for iOS, how to find the distance between two circular bodies?
I am using the following code to get the distance between two circular bodies of different radius: 我正在使用以下代码来获取不同半径的两个圆形物体之间的距离:
distance = b2Distance(body1->GetPosition(), body2->GetPosition());
I have realized that variable distance is storing the distance between the two centers of the bodies, but not the distance between the borders. 我已经意识到,可变距离存储的是物体两个中心之间的距离,而不是边界之间的距离。 What I want is distance=0 when the two bodies are touching.
我想要的是两个物体接触时,距离= 0。
How can I do that? 我怎样才能做到这一点? I've been trying this code but it fails:
我一直在尝试这段代码,但失败了:
b2DistanceInput *distanceInput;
distanceInput->transformA = body1->GetTransform();
distanceInput->transformB = body2->GetTransform();
b2DistanceProxy *proxyA;
proxyA->Set(fixtureBody1->GetShape(), 1);
b2DistanceProxy *proxyB;
proxyB->Set(fixtureBody2->GetShape(), 1);
distanceInput->proxyA = *proxyA;
distanceInput->proxyB = *proxyB;
b2DistanceOutput *theDistance;
b2SimplexCache *cache;
cache->count = 0;
b2Distance(theDistance, cache, distanceInput);
The getShape method is giving a bad access error within the b2box code. getShape方法在b2box代码内提供了错误的访问错误。
Any ideas? 有任何想法吗?
Thanks, 谢谢,
GA GA
Try use this code - it work for me: 尝试使用此代码-适用于我:
b2DistanceInput *distanceInput = new b2DistanceInput();
b2DistanceProxy *proxyA = new b2DistanceProxy();
b2DistanceProxy *proxyB = new b2DistanceProxy();
b2SimplexCache *cache = new b2SimplexCache();
b2DistanceOutput *theDistance = new b2DistanceOutput();
proxyA->Set(fixtureBody1->GetShape(),1);
proxyB->Set(fixtureBody2->GetShape(),1);
distanceInput->transformA = body1->GetTransform();
distanceInput->transformB = body2->GetTransform();
distanceInput->proxyA = *proxyA;
distanceInput->proxyB = *proxyB;
distanceInput->useRadii = true;
cache->count = 0;
b2Distance(theDistance, cache, distanceInput);
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