问box2d libgdx --将box2d体“绑定”到精灵或其他对象上。

EN

vertexArray = new Vector2[3];
    vertexArray[0] = new Vector2(0, 0);
    vertexArray[1] = new Vector2(2, 0);
    vertexArray[2] = new Vector2(1, 3);

    treePolygonShape = new PolygonShape();
    treePolygonShape.set(vertexArray);

    fixtureTree = new FixtureDef();
    fixtureTree.shape = treePolygonShape;
    fixtureTree.filter.categoryBits = Game.TREE;  // 0x0001 short int
    fixtureTree.filter.maskBits = Game.CHARACTER; //0x0002 short int

    characterShape = new CircleShape();
    shape.setRadius(1);

    fixtureCharacter = new FixtureDef();
    fixtureCharacter.shape = characterShape;
    fixtureCharacter.filter.categoryBits = Game.CHARACTER;
    fixtureCharacter.filter.maskBits =  Game.TREE;

    characterBodyDef.type = BodyDef.BodyType.KinematicBody; //I suppose your body is kinematic but it can be dynamic too

    Body body = world.createBody(characterBodyDef);
    body.setUserData(characterView); //display object of your character which is linked to the physical body in this way
    characterView.setBody(body); // you can create this setter to have a reference to the physical body from display object
    body.createFixture(fixtureCharacter);

    treeBodyDef.type = BodyDef.BodyType.StaticBody; 
    treeBodyDef.position.set(treeX, treeY); //you can set tree position here , or later using setTransform(x, y, angle) function

    Body treeBody = world.createBody(treeBodyDef);
    treeBody.setUserData(treeView); //display object of your tree linked to the body
    treeView.setBody(treeBody); // you can create this setter to have a reference to the physical body from display object
    treeBody.createFixture(fixtureTree);

body.setLinearVelocity(velocityX, velocityY);

treeBody.setTransform(x, y, angle)