[cpp] Port physics translation and rotation methods.

spine-cpp/spine-cpp/include/spine/PhysicsConstraint.h

@@ -154,6 +154,10 @@ namespace spine {
 
         virtual void update(Physics physics);
 
+        void translate(float x, float y);
+
+        void rotate(float x, float y, float degrees);
+
     private:
         PhysicsConstraintData& _data;
         Bone* _bone;

spine-cpp/spine-cpp/include/spine/Skeleton.h

@@ -237,6 +237,13 @@ namespace spine {
 
         void update(float delta);
 
+        /// Rotates the physics constraint so next {@link #update(Physics)} forces are applied as if the bone rotated around the
+	    /// specified point in world space.
+        void physicsTranslate(float x, float y);
+
+        /// Calls {@link PhysicsConstraint#rotate(float, float, float)} for each physics constraint. */
+        void physicsRotate(float x, float y, float degrees);
+
 	private:
 		SkeletonData *_data;
 		Vector<Bone *> _bones;

spine-cpp/spine-cpp/src/spine/PhysicsConstraint.cpp

@@ -464,3 +464,19 @@ void PhysicsConstraint::update(Physics physics) {
 	}
 	bone->updateAppliedTransform();
 }
+
+void PhysicsConstraint::rotate(float x, float y, float degrees) {
+    float r = degrees * MathUtil::Deg_Rad, cos = MathUtil::cos(r), sin = MathUtil::sin(r);
+    r = _tx * cos - _ty * sin;
+    _ty = _tx * sin + _ty * cos;
+    _tx = r;
+    float dx = _cx - x, dy = _cy - y;
+    translate(dx * cos - dy * sin - dx, dx * sin + dy * cos - dy);
+}
+
+void PhysicsConstraint::translate(float x, float y) {
+    _ux -= x;
+    _uy -= y;
+    _cx -= x;
+    _cy -= y;
+}

spine-cpp/spine-cpp/src/spine/Skeleton.cpp

@@ -711,3 +711,15 @@ void Skeleton::setTime(float time) {
 void Skeleton::update(float delta) {
 	_time += delta;
 }
+
+void Skeleton::physicsTranslate(float x, float y) {
+    for (int i = 0; i < (int)_physicsConstraints.size(); i++) {
+        _physicsConstraints[i]->translate(x, y);
+    }
+}
+
+void Skeleton::physicsRotate(float x, float y, float degrees) {
+    for (int i = 0; i < (int)_physicsConstraints.size(); i++) {
+        _physicsConstraints[i]->rotate(x, y, degrees);
+    }
+}