Sorted out Body gravity settings and updated the example.

Author: photonstorm

README.md

@@ -149,6 +149,7 @@ New features:
 * Tweens are now bound to their own TweenManager, not always the global game one. So you can create your own managers now (for you clark :)
 * ScaleManager.fullScreenTarget allows you to change the DOM element that the fullscreen API is called on (feature request #526)
 * Merged Georges p2 BodyDebug and reformatted for jshint pass. Looks awesome :)
+* ArcadePhysics.Body has a new gravityScale property, which is a modifier multiplied against the world gravity value on a Body.
 
 
 Updates:

examples/arcade physics/gravity.js

@@ -1,5 +1,5 @@
 
-var game = new Phaser.Game(800, 600, Phaser.AUTO, 'phaser-example', { preload: preload, create: create });
+var game = new Phaser.Game(800, 600, Phaser.AUTO, 'phaser-example', { preload: preload, create: create, render: render });
 
 function preload() {
 
@@ -10,6 +10,7 @@ function preload() {
 var sprite1;
 var sprite2;
 var sprite3;
+var sprite4;
 
 function create() {
 
@@ -19,33 +20,40 @@ function create() {
     game.physics.arcade.gravity.y = 100;
 
     //  Sprite 1 will use the World (global) gravity
-    sprite1 = game.add.sprite(300, 32, 'ilkke');
+    sprite1 = game.add.sprite(100, 96, 'ilkke');
 
     //  Sprite 2 is set to ignore the global gravity and use its own value
-    sprite2 = game.add.sprite(400, 32, 'ilkke');
+    sprite2 = game.add.sprite(300, 96, 'ilkke');
 
+    //  Sprite 3 will use both the world gravity and its own gravityScale modifier
+    sprite3 = game.add.sprite(500, 96, 'ilkke');
 
-    //  Sprite 3 will use both the global gravity and its own value
-    sprite3 = game.add.sprite(500, 32, 'ilkke');
-
-    // We obviously need to enable physics on those sprites
-    game.physics.enable([sprite1,sprite2,sprite3], Phaser.Physics.ARCADE);
+    //  Sprite 4 will ignore all gravity
+    sprite4 = game.add.sprite(700, 96, 'ilkke');
 
+    // Enable physics on those sprites
+    game.physics.enable( [ sprite1, sprite2, sprite3, sprite4 ], Phaser.Physics.ARCADE);
 
     sprite1.body.collideWorldBounds = true;
     sprite1.body.bounce.y = 0.8;
-
 
     sprite2.body.collideWorldBounds = true;
     sprite2.body.bounce.y = 0.8;
-    sprite2.body.allowGravity = false;
-    sprite3.body.gravityScale.y = 10;
-
+    sprite2.body.gravity.y = 200;
 
     sprite3.body.collideWorldBounds = true;
     sprite3.body.bounce.y = 0.8;
-    sprite3.body.gravityScale.y = 10;
+    sprite3.body.gravityScale.y = 3;
 
-    
+    sprite4.body.allowGravity = false;
 
 }
+
+function render() {
+
+    game.debug.text('world gravity', sprite1.x - 32, 64);
+    game.debug.text('local gravity', sprite2.x - 32, 64);
+    game.debug.text('gravityScale', sprite3.x - 32, 64);
+    game.debug.text('no gravity', sprite4.x - 32, 64);
+
+}

examples/arcade physics/quadtree - ids.js

@@ -38,10 +38,6 @@ var Phaser = Phaser || {
 	SPRITEBATCH: 17,
 	RETROFONT: 18,
 
-	// DYNAMIC: 1,
-	// STATIC: 2,
-	// KINEMATIC: 4,
-
 	//	The various blend modes supported by pixi / phaser
 	blendModes: {
 	    NORMAL:0,

src/Phaser.js

@@ -599,6 +599,8 @@ Phaser.Game.prototype = {
 
         this.time.update(time);
 
+        this.debug.preUpdate();
+
         this.render();
 
     },

src/core/Game.js

@@ -124,13 +124,13 @@ Phaser.Physics.Arcade.Body = function (sprite) {
     this.drag = new Phaser.Point();
 
     /**
-    * @property {boolean} allowGravity - Allow this Body to be influenced by world gravity?
+    * @property {boolean} allowGravity - Allow this Body to be influenced by gravity? Either world or local.
     * @default
     */
     this.allowGravity = true;
 
     /**
-    * @property {Phaser.Point} gravity - A local gravity applied to this Body. If set this over-rides any world gravity.
+    * @property {Phaser.Point} gravity - A local gravity applied to this Body. If non-zero this over rides any world gravity, unless Body.allowGravity is set to false.
     */
     this.gravity = new Phaser.Point(0, 0);
 

src/physics/arcade/Body.js

@@ -245,22 +245,25 @@ Phaser.Physics.Arcade.prototype = {
         body.rotation += (body.angularVelocity * this.game.time.physicsElapsed);
 
         //  Apply gravity using the p2 style gravityScale
-        if (body.gravity.x !== 0)
+        if (body.allowGravity)
         {
-            body.velocity.x += body.gravity.x * this.game.time.physicsElapsed;
-        }
-        else
-        {
-            body.velocity.x += this.gravity.x * this.game.time.physicsElapsed * body.gravityScale.x;
-        }
+            if (body.gravity.x !== 0)
+            {
+                body.velocity.x += body.gravity.x * this.game.time.physicsElapsed;
+            }
+            else
+            {
+                body.velocity.x += this.gravity.x * this.game.time.physicsElapsed * body.gravityScale.x;
+            }
 
-        if (body.gravity.y !== 0)
-        {
-            body.velocity.y += body.gravity.y * this.game.time.physicsElapsed;
-        }
-        else
-        {
-            body.velocity.y += this.gravity.y * this.game.time.physicsElapsed * body.gravityScale.y;
+            if (body.gravity.y !== 0)
+            {
+                body.velocity.y += body.gravity.y * this.game.time.physicsElapsed;
+            }
+            else
+            {
+                body.velocity.y += this.gravity.y * this.game.time.physicsElapsed * body.gravityScale.y;
+            }
         }
 
         //  Apply velocity