refactor: clean up weld joint

Author: AlmasB

fxgl-entity/src/main/java/com/almasb/fxgl/physics/box2d/dynamics/joints/WeldJoint.java

@@ -231,9 +231,7 @@ public void initVelocityConstraints(final SolverData data) {
             m_impulse.setZero();
         }
 
-//    data.velocities[m_indexA].v.set(vA);
         data.velocities[m_indexA].w = wA;
-//    data.velocities[m_indexB].v.set(vB);
         data.velocities[m_indexB].w = wB;
 
         pool.pushVec2(1);
@@ -308,9 +306,7 @@ public void solveVelocityConstraints(final SolverData data) {
             pool.pushVec3(2);
         }
 
-//    data.velocities[m_indexA].v.set(vA);
         data.velocities[m_indexA].w = wA;
-//    data.velocities[m_indexB].v.set(vB);
         data.velocities[m_indexB].w = wB;
 
         pool.pushVec2(3);
@@ -392,9 +388,7 @@ public boolean solvePositionConstraints(final SolverData data) {
             pool.pushVec3(2);
         }
 
-//    data.positions[m_indexA].c.set(cA);
         data.positions[m_indexA].a = aA;
-//    data.positions[m_indexB].c.set(cB);
         data.positions[m_indexB].a = aB;
 
         pool.pushVec2(5);

fxgl-entity/src/main/java/com/almasb/fxgl/physics/box2d/dynamics/joints/WeldJointDef.java

@@ -9,51 +9,37 @@
 import com.almasb.fxgl.physics.box2d.dynamics.Body;
 import com.almasb.fxgl.physics.box2d.dynamics.World;
 
-/**
- * Created at 3:38:52 AM Jan 15, 2011
- */
-
 /**
  * @author Daniel Murphy
  */
 public class WeldJointDef extends JointDef<WeldJoint> {
     /**
      * The local anchor point relative to body1's origin.
      */
-    public final Vec2 localAnchorA;
+    public final Vec2 localAnchorA = new Vec2();
 
     /**
      * The local anchor point relative to body2's origin.
      */
-    public final Vec2 localAnchorB;
+    public final Vec2 localAnchorB = new Vec2();
 
     /**
      * The body2 angle minus body1 angle in the reference state (radians).
      */
-    public float referenceAngle;
+    public float referenceAngle = 0f;
 
     /**
      * The mass-spring-damper frequency in Hertz. Rotation only. Disable softness with a value of 0.
      */
-    public float frequencyHz;
+    public float frequencyHz = 0f;
 
     /**
      * The damping ratio. 0 = no damping, 1 = critical damping.
      */
-    public float dampingRatio;
-
-    public WeldJointDef() {
-        localAnchorA = new Vec2();
-        localAnchorB = new Vec2();
-        referenceAngle = 0.0f;
-    }
+    public float dampingRatio = 0f;
 
     /**
      * Initialize the bodies, anchors, and reference angle using a world anchor point.
-     *
-     * @param bA
-     * @param bB
-     * @param anchor
      */
     public void initialize(Body bA, Body bB, Vec2 anchor) {
         setBodyA(bA);