Arcade.Body.friction allows you to have more fine-grained control o…

…ver the amount of velocity passed between bodies on collision.

README.md

@@ -63,10 +63,11 @@ Version 2.3.0 - "Tarabon" - in dev
 ### New Features
 
 * `Physics.Arcade.isPaused` allows you to toggle Arcade Physics processing on and off. If `true` the `Body.preUpdate` method will be skipped, halting all motion for all bodies. Note that other methods such as `collide` will still work, so be careful not to call them on paused bodies.
+* `Arcade.Body.friction` allows you to have more fine-grained control over the amount of velocity passed between bodies on collision.
 
 ### Updates
 
-* TypeScript definitions fixes and updates (thanks @clark-stevenson @TimvdEijnden)
+* TypeScript definitions fixes and updates (thanks @clark-stevenson @TimvdEijnden @belohlavek @ivw)
 
 ### Bug Fixes
 
@@ -122,13 +123,13 @@ Phaser is released under the [MIT License](http://opensource.org/licenses/MIT).
 
 <img src="http://phaser.io/images/github/learn.jpg" align="right">
 
-We have a [Getting Started Guide](http://phaser.io/getting-started-js.php) which covers all you need to begin developing games with Phaser. From setting up a web server to picking an IDE to coding your first game.
+We have a [Getting Started Guide](http://phaser.io/getting-started-js.php) which covers all you need to begin developing games with Phaser. From setting up a web server, to picking an IDE and coding your first game.
 
 Prefer **videos** to reading? Lynda.com have published a free course: [HTML5 Game Development with Phaser](http://www.lynda.com/Phaser-tutorials/HTML5-Game-Development-Phaser/163641-2.html)
 
-Use the [How to Learn Phaser](http://gamedevelopment.tutsplus.com/articles/how-to-learn-the-phaser-html5-game-engine--gamedev-13643) guide we wrote for GameDevTuts+. It covers finding tutorials, examples and getting support.
+Use the [How to Learn Phaser](http://gamedevelopment.tutsplus.com/articles/how-to-learn-the-phaser-html5-game-engine--gamedev-13643) guide we wrote for GameDevTuts. It covers finding tutorials, examples and getting support.
 
-Although currently a bit of a "wall of text" we urge you to keep and eye on the **News** section of the [Phaser web site](http://phaser.io). We post fresh links posted there *daily*.
+Although currently a bit of a "wall of text" we urge you to keep an eye on the **News** section of the [Phaser web site](http://phaser.io). We post fresh links there *daily*.
 
 Using Phaser with **TypeScript**? Check out this great series of [Game From Scratch](http://www.gamefromscratch.com/page/Adventures-in-Phaser-with-TypeScript-tutorial-series.aspx) tutorials.
 

src/physics/arcade/Body.js

@@ -87,7 +87,7 @@ Phaser.Physics.Arcade.Body = function (sprite) {
     this.width = sprite.width;
 
     /**
-    * @property .numInternal ID cache
+    * @property {number} height - The calculated height of the physics body.
     */
     this.height = sprite.height;
 
@@ -154,6 +154,11 @@ Phaser.Physics.Arcade.Body = function (sprite) {
     */
     this.maxVelocity = new Phaser.Point(10000, 10000);
 
+    /**
+    * @property {Phaser.Point} friction - x
+    */
+    this.friction = new Phaser.Point(1, 0);
+
     /**
     * @property {number} angularVelocity - The angular velocity in pixels per second sq. of the Body.
     * @default

src/physics/arcade/World.js

@@ -983,11 +983,23 @@ Phaser.Physics.Arcade.prototype = {
                 {
                     body1.x = body1.x - this._overlap;
                     body1.velocity.x = this._velocity2 - this._velocity1 * body1.bounce.x;
+
+                    //  This is special case code that handles things like vertically moving platforms you can ride
+                    if (body2.moves)
+                    {
+                        body1.y += (body2.y - body2.prev.y) * body2.friction.y;
+                    }
                 }
                 else if (!body2.immovable)
                 {
                     body2.x += this._overlap;
                     body2.velocity.x = this._velocity1 - this._velocity2 * body2.bounce.x;
+
+                    //  This is special case code that handles things like vertically moving platforms you can ride
+                    if (body1.moves)
+                    {
+                        body2.y += (body1.y - body1.prev.y) * body1.friction.y;
+                    }
                 }
 
                 return true;
@@ -1103,7 +1115,7 @@ Phaser.Physics.Arcade.prototype = {
                     //  This is special case code that handles things like horizontal moving platforms you can ride
                     if (body2.moves)
                     {
-                        body1.x += body2.x - body2.prev.x;
+                        body1.x += (body2.x - body2.prev.x) * body2.friction.x;
                     }
                 }
                 else if (!body2.immovable)
@@ -1114,7 +1126,7 @@ Phaser.Physics.Arcade.prototype = {
                     //  This is special case code that handles things like horizontal moving platforms you can ride
                     if (body1.moves)
                     {
-                        body2.x += body1.x - body1.prev.x;
+                        body2.x += (body1.x - body1.prev.x) * body1.friction.x;
                     }
                 }