我试图创建一个电梯。我使用PrismaticJointDef，但是身体A具有相同的身体位置B.如何定义两个身体之间的距离？我也使用了DistanceJointDef，但得到了相同的结果。 我希望像这个视频得到这样的结果。 https://www.youtube.com/watch?v=rzNjNBKYuGI
private void defineBodyA(){
bodyDef.type = BodyDef.BodyType.DynamicBody;
bodyDef.position.set(getX() + getWidth() / 2, getY() + getHeight() / 2);
bodyA = world.createBody(bodyDef);
PolygonShape shape = new PolygonShape();
shape.setAsBox(getWidth() / 2, getHeight() / 2);
fixtureDef.shape = shape;
bodyA.createFixture(fixtureDef);
bodyA.setLinearDamping(30f);
shape.dispose();
}
private void defineBodyB{
bodyDef.position.set(getX() + getWidth() / 2, (getY() + 80 / PPM);
bodyDef.type = BodyDef.BodyType.StaticBody;
bodyB = world.createBody(bodyDef);
PolygonShape upOfElevator = new PolygonShape();
upOfElevator.setAsBox(16f / PPM, 0.5f / PPM);
fixtureDef.shape = upOfElevator;
bodyB.createFixture(fixtureDef);
upOfElevator.dispose();
}
PrismaticJointDef prismaticJointDef = new PrismaticJointDef();
prismaticJointDef.bodyA = bodyA;
prismaticJointDef.bodyB = bodyB;
world.createJoint(prismaticJointDef);
DistanceJointDef distanceJointDef = new DistanceJointDef();
distanceJointDef.bodyA = bodyA;
distanceJointDef.bodyB = bodyB;
distanceJointDef.length = 100 / PPM;
world.createJoint(distanceJointDef);