libgdx box2d如何获取当前身体位置

Question

Why doesn't this work?

for (Body body : worldBodies) {
    if (body.getPosition().y<0)
    {
        sprite.setColor(Color.GREEN);
    }
}

Answer 1

Please notice that body origin is at its center so what you should check is actually

    if (body.getPosition().y - bodyShapeHeight/2f < 0 ) //bodyShapeHeight is just a variable you have to create
    {
        ...

Unfortunately there is no like bodyHeight - it depends on Fixture. If you have only one and its aligned to center you probably can use

    body.getFixtureList().first().getShape().getRadius();

instead of using additional variable but if not you have to remember shape height in some bodyShapeHeight variable