fabric.Object.setAngle consider different originX/originY values other than "center"

Closes issue #1093

src/mixins/object_origin.mixin.js

@@ -198,6 +198,45 @@
       this.originX = to;
     },
 
+    /**
+     * @private
+     * Sets the origin/position of the object to it's center point
+     * @return {void}
+     */
+    _setOriginToCenter: function() {
+      this._originalOriginX = this.originX;
+      this._originalOriginY = this.originY;
+
+      var center = this.getCenterPoint();
+
+      this.originX = 'center';
+      this.originY = 'center';
+
+      this.left = center.x;
+      this.top = center.y;
+    },
+
+    /**
+     * @private
+     * Resets the origin/position of the object to it's original origin
+     * @return {void}
+     */
+    _resetOrigin: function() {
+      var originPoint = this.translateToOriginPoint(
+        this.getCenterPoint(),
+        this._originalOriginX,
+        this._originalOriginY);
+
+      this.originX = this._originalOriginX;
+      this.originY = this._originalOriginY;
+
+      this.left = originPoint.x;
+      this.top = originPoint.y;
+
+      this._originalOriginX = null;
+      this._originalOriginY = null;
+    },
+
     /**
      * @private
      */

src/shapes/object.class.js

@@ -1310,7 +1310,7 @@
     /**
      * Sets "color" of an instance (alias of `set('fill', …)`)
      * @param {String} color Color value
-     * @return {fabric.Text} thisArg
+     * @return {fabric.Object} thisArg
      * @chainable
      */
     setColor: function(color) {
@@ -1318,6 +1318,28 @@
       return this;
     },
 
+    /**
+     * Sets "angle" of an instance
+     * @param {Number} angle Angle value
+     * @return {fabric.Object} thisArg
+     * @chainable
+     */
+    setAngle: function(angle) {
+      var shouldCenterOrigin = (this.originX !== 'center' || this.originY !== 'center') && this.centeredRotation;
+
+      if (shouldCenterOrigin) {
+        this._setOriginToCenter();
+      }
+
+      this.set('angle', angle);
+
+      if (shouldCenterOrigin) {
+        this._resetOrigin();
+      }
+
+      return this;
+    },
+
     /**
      * Centers object horizontally on canvas to which it was added last.
      * You might need to call `setCoords` on an object after centering, to update controls area.