onDragUpdate is a new signal that is dispatched whenever a Game object enabled for input and drag is moved by a pointer (i.e. during a drag event). See the Phaser.InputHandler.enableDrag docs for parameter details and the new Phaser Example.

README.md

@@ -300,6 +300,7 @@ Version 2.4 - "Katar" - in dev
 * Device.firefoxVersion is a new property that contains the major Firefox version number if running within Firefox, otherwise zero.
 * Math.distanceSq will return the euclidean distance squared between the two given set of coordinates (thanks @jeremyosborne #1761 #1770)
 * StateManager.onStateChange is a new signal which is dispatched whenever the State changes from one to another. The callback you specify is sent two parameters: the string based key of the new state, and the second parameter is the string based key of the old / previous state. 
+* onDragUpdate is a new signal that is dispatched whenever a Game object enabled for input and drag is moved by a pointer (i.e. during a drag event). See the `Phaser.InputHandler.enableDrag` docs for parameter details and the new Phaser Example.
 
 ### Updates
 

src/gameobjects/components/Events.js

@@ -56,6 +56,7 @@ Phaser.Events.prototype = {
         if (this._onInputDown)         { this._onInputDown.dispose(); }
         if (this._onInputUp)           { this._onInputUp.dispose(); }
         if (this._onDragStart)         { this._onDragStart.dispose(); }
+        if (this._onDragUpdate)        { this._onDragUpdate.dispose(); }
         if (this._onDragStop)          { this._onDragStop.dispose(); }
 
         if (this._onAnimationStart)    { this._onAnimationStart.dispose(); }
@@ -131,6 +132,11 @@ Phaser.Events.prototype = {
     */
     onDragStart: null,
 
+    /**
+    * @property {Phaser.Signal} onDragUpdate - This signal is dispatched if the parent is inputEnabled and receives a drag update event from a Pointer.
+    */
+    onDragUpdate: null,
+
     /**
     * @property {Phaser.Signal} onDragStop - This signal is dispatched if the parent is inputEnabled and receives a drag stop event from a Pointer.
     */

src/input/InputHandler.js

@@ -1064,6 +1064,7 @@ Phaser.InputHandler.prototype = {
             {
                 this.sprite.cameraOffset.x = Math.round((this.sprite.cameraOffset.x - (this.snapOffsetX % this.snapX)) / this.snapX) * this.snapX + (this.snapOffsetX % this.snapX);
                 this.sprite.cameraOffset.y = Math.round((this.sprite.cameraOffset.y - (this.snapOffsetY % this.snapY)) / this.snapY) * this.snapY + (this.snapOffsetY % this.snapY);
+                this.snapPoint.set(this.sprite.cameraOffset.x, this.sprite.cameraOffset.y);
             }
         }
         else
@@ -1092,9 +1093,12 @@ Phaser.InputHandler.prototype = {
             {
                 this.sprite.x = Math.round((this.sprite.x - (this.snapOffsetX % this.snapX)) / this.snapX) * this.snapX + (this.snapOffsetX % this.snapX);
                 this.sprite.y = Math.round((this.sprite.y - (this.snapOffsetY % this.snapY)) / this.snapY) * this.snapY + (this.snapOffsetY % this.snapY);
+                this.snapPoint.set(this.sprite.x, this.sprite.y);
             }
         }
 
+        this.sprite.events.onDragUpdate.dispatch(this.sprite, pointer, px, py, this.snapPoint);
+
         return true;
 
     },
@@ -1202,7 +1206,15 @@ Phaser.InputHandler.prototype = {
     },
 
     /**
-    * Make this Sprite draggable by the mouse. You can also optionally set mouseStartDragCallback and mouseStopDragCallback
+    * Allow this Sprite to be dragged by any valid pointer.
+    *
+    * When the drag begins the Sprite.events.onDragStart event will be dispatched.
+    * 
+    * When the drag completes by way of the user letting go of the pointer that was dragging the sprite, the Sprite.events.onDragStop event is dispatched.
+    *
+    * For the duration of the drag the Sprite.events.onDragUpdate event is dispatched. This event is only dispatched when the pointer actually
+    * changes position and moves. The event sends 5 parameters: `sprite`, `pointer`, `dragX`, `dragY` and `snapPoint`.
+    * 
     * @method Phaser.InputHandler#enableDrag
     * @param {boolean} [lockCenter=false] - If false the Sprite will drag from where you click it minus the dragOffset. If true it will center itself to the tip of the mouse pointer.
     * @param {boolean} [bringToTop=false] - If true the Sprite will be bought to the top of the rendering list in its current Group.