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PODrawing using textureRegion
 

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  1. PODrawing using textureRegion
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    <p>I'm trying to make a movable car in java, using libgdx and box2d; I made a car, m_car, with position set in middle of the car. In every step, i take take the current position of the m_car, decrese that values with the cars width/height, so i have the left bottom corner. When is on a straight ground, it shows well, the texture is where is should be, but when the ground have an angle, the texture position its under, or upper the car. I don't understand how TextureRegion works, i think that when the angle is not 0, i dont take the point of drawing well, and i dont know how to solve it. help me pls :) Ty.</p> <p>Edit:</p> <p>my code is a mess, its not an actual project, its an ideea, and i took pieces, and put them down to see how they work, so when il start the project, i would know what to do, this is my car declaration: </p> <pre><code>private void car2(){ m_hz = 5.0f; m_zeta = 0.7f; m_speed = 50.0f; BodyDef bd = new BodyDef(); bd.type = BodyType.DynamicBody; part1(bd); part2(bd); part3(bd); wheels(bd); m_car.setAwake(true); } private void part3(BodyDef bd) { PolygonShape shape = new PolygonShape(); shape.setAsBox(0.01f, 0.35f,new Vector2(1.01f - 3, 4.85f - 4), 0); m_car.createFixture(shape, 1.0f); } private void part1(BodyDef bd){ PolygonShape chassis = new PolygonShape(); Vector2 vertices[] = new Vector2[6]; vertices[0] = new Vector2(-2, -0.5f); vertices[1] = new Vector2(-2, 0.5f); vertices[2] = new Vector2(1.25f, 0.5f); vertices[3] = new Vector2(2.5f, 0.15f); vertices[4] = new Vector2(2.5f, -0.5f); vertices[5] = new Vector2(-2, -0.5f); chassis.set(vertices); bd.position.set(new Vector2(3, 4)); m_car = m_world.createBody(bd); m_car.createFixture(chassis, 1.0f); } private void part2(BodyDef bd){ PolygonShape chassis = new PolygonShape(); Vector2 vertices[] = new Vector2[5]; vertices[0] = new Vector2(3, 4.5f); vertices[1] = new Vector2(3, 5.25f); vertices[2] = new Vector2(3.80f, 5.25f); vertices[3] = new Vector2(4.25f, 4.5f); vertices[4] = new Vector2(3, 4.5f); for (int i = 0; i &lt; 5; ++ i){ vertices[i].x -= 3; vertices[i].y -= 4; } chassis.set(vertices); //m_car = m_world.createBody(bd); m_car.createFixture(chassis, 1.0f); } private void wheels(BodyDef bd){ CircleShape circle = new CircleShape(); circle.setRadius(0.4f); FixtureDef fd = new FixtureDef(); fd.shape = circle; fd.density = 1.0f; fd.friction = 0.9f; bd.position.set(2f, 3.5f); m_wheel1 = m_world.createBody(bd); m_wheel1.createFixture(fd); bd.position.set(4.5f, 3.5f); m_wheel2 = m_world.createBody(bd); m_wheel2.createFixture(fd); WheelJointDef jd = new WheelJointDef(); Vector2 axis = new Vector2(1.0f, 0.5f); jd.initialize(m_car, m_wheel1, m_wheel1.getPosition(), axis); jd.motorSpeed = 0.0f; jd.maxMotorTorque = 20.0f; jd.enableMotor = true; jd.frequencyHz = m_hz; jd.dampingRatio = m_zeta; m_spring1 = (WheelJoint) m_world.createJoint(jd); jd.initialize(m_car, m_wheel2, m_wheel2.getPosition(), axis); jd.motorSpeed = 0.0f; jd.maxMotorTorque = 10.0f; jd.enableMotor = false; jd.frequencyHz = m_hz; jd.dampingRatio = m_zeta; m_spring2 = (WheelJoint) m_world.createJoint(jd); } </code></pre> <p>some explenation: why i have for for vertices to decreese 3 and 4 ? i didnt know that if i set position to the bodydef, the vertices consider that point to be 0, 0, when i found out, was easyer to me to just decrese (cuz its just for test, to see how it works)</p> <p>and this is how i draw:</p> <pre><code> float angle = (float) Math.toDegrees(m_car.getAngle()); batch.draw(textureRegion, x, y, 3f, 4f, 4.5f, 2.75f, 1f, 0.61f, angle); </code></pre>
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