如何将贝塞尔曲线转换为box2d对象？

Question

我使用贝塞尔曲线画线，我需要将贝塞尔曲线转换为box2d对象。我可以在box2d中使用哪个对象？有什么建议吗？

Answer 1

尝试理解它......

+(b2ChainShape)curveWithPoints:(CGPoint*)points Times:(int)times
{
    //points.count must be 3
    b2ChainShape shape;
    float step = 1/(float)times;
    float t = 0;
    b2Vec2 *p = new b2Vec2[times];
    b2Vec2 v1 = [CCMethod toMeter:points[0]];
    b2Vec2 v2 = [CCMethod toMeter:points[1]];
    b2Vec2 v3 = [CCMethod toMeter:points[2]];
    for(int i = 0;i < times;i++){
        b2Vec2 pa = v1;
        pa *= ( (t-1)*(t-1)*0.5 );
        b2Vec2 pb = v2;
        pb *= ( (-t)*t+t+0.5 );
        b2Vec2 pc = v3;
        pc *= ( t*t*0.5 );
        p[i] = pa+pb+pc;
        t+=step;
    }
    shape.CreateChain(p, times);
    return shape;
}

接下来你唯一需要做的就是用这种形状创造身体和夹具。 我希望你有希望...