[libgdx] Added physics methods to apply translation and rotation forces.

spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/PhysicsConstraint.java

@@ -108,7 +108,22 @@ public class PhysicsConstraint implements Updatable {
 		mix = data.mix;
 	}
 
-	public void translate () {
+	/** Translates the physics constraint so next {@link #update(Physics)} forces are applied as if the bone moved an additional
+	 * amount in world space. */
+	public void translate (float x, float y) {
+		ux -= x;
+		uy -= y;
+		cx -= x;
+		cy -= y;
+	}
+
+	/** Rotates the physics constraint so next {@link #update(Physics)} forces are applied as if the bone rotated an additional
+	 * amount in world space. */
+	public void rotate (float degrees) {
+		float r = degrees * degRad, cos = cos(r), sin = sin(r);
+		r = tx * cos - ty * sin;
+		ty = tx * sin + ty * cos;
+		tx = r;
 	}
 
 	/** Applies the constraint to the constrained bones. */

spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Skeleton.java

@@ -803,6 +803,20 @@ public class Skeleton {
 		this.y = y;
 	}
 
+	/** Calls {@link PhysicsConstraint#translate(float, float)} for each physics constraint. */
+	public void physicsTranslate (float x, float y) {
+		Object[] physicsConstraints = this.physicsConstraints.items;
+		for (int i = 0, n = this.physicsConstraints.size; i < n; i++)
+			((PhysicsConstraint)physicsConstraints[i]).translate(x, y);
+	}
+
+	/** Calls {@link PhysicsConstraint#rotate(float)} for each physics constraint. */
+	public void physicsRotate (float degrees) {
+		Object[] physicsConstraints = this.physicsConstraints.items;
+		for (int i = 0, n = this.physicsConstraints.size; i < n; i++)
+			((PhysicsConstraint)physicsConstraints[i]).rotate(degrees);
+	}
+
 	/** Returns the skeleton's time. This is used for time-based manipulations, such as {@link PhysicsConstraint}.
 	 * <p>
 	 * See {@link #update(float)}. */