获取多边形形状体的顶点列表

Question

如何在libgdx中获取特定多边形体的顶点列表？

像这样：

public Array<Vector2> getVerts(Body body){
    Array<Vector2>verts = null;

    // can't find how to look them up properly anywhere

    return verts;
}

谢谢！

Answer 1

我没有使用过LibGDX，但是我和Box2D一起工作并查看了API，我建议：

//Assuming only 1 fixture per body and a polygon shape


Array<Vector2>verts = new Array<Vector2>();
Fixture f = body.getFixtureList().get(0);
PolygonShape s = f.shape;
for (int i = 0; i < s.getVertexCount(); i++)
{
    verts.add(s.getVertex(i, /*I couldn't figure out what this param is supposed to be*/));
}

_{这是在没有IDE的情况下键入的，请注意明显的错误！我也没有在很长一段时间内完成Java。}

Answer 2

基于@James Webster的代码：

Array<Vector2> verts = new Array<Vector2>();
Fixture f = body.getFixtureList().get(0);
PolygonShape s = f.shape;

// this is needed to temporarily keep the vertex, getVertex is a void method
Vector2 tmp = new Vector2();
for (int i = 0; i < s.getVertexCount(); i++) {
    // fill tmp with the vertex
    s.getVertex(i, tmp));
    verts.add(new Vector2(tmp));
}