Changing state with box2d - gravity

matts444 · August 26, 2015

I have an issue where the gravity value doesnt change when switching between states e.g. between levels.

im sure this is an issue with the plugin as the value of this.game.physics.box2d.gravity.y is changing, but the gravity change is having no effect on any of the objects.

this only works the first time I load the state, when I start a new state with a new gravity.y with even a minus gravity value it has no different effect.

I created an example of what i mean in the gravity scale example file. I used the ball sprite as the button, left for restart state and right to change the gravity. If you run it and click the right button to change the gravity, then click the left button to restart the state and you'll see that the gravity is still at -300.

<!doctype html>

<html>

<head>

<title>Phaser Box2D Example</title>

</head>

<body>

var game = new Phaser.Game(800, 600, Phaser.CANVAS, 'phaser-example', { preload: preload, create: create });

function preload() {

game.load.image('ball', 'assets/sprites/shinyball.png');

}

function create() {

game.stage.backgroundColor = '#124184';

// Enable Box2D physics

game.physics.startSystem(Phaser.Physics.BOX2D);

game.physics.box2d.setBoundsToWorld();

game.physics.box2d.gravity.y = 300;

game.physics.box2d.restitution = 0.8;

var sprite1 = game.add.sprite(200, 100, 'ball');

var sprite2 = game.add.sprite(400, 100, 'ball');

var sprite3 = game.add.sprite(600, 100, 'ball');

var button = game.add.button(300, 300, 'ball', restart, this);

var button = game.add.button(500, 300, 'ball', gravity, this);

// Enable for physics. This creates a default rectangular body.

game.physics.box2d.enable([ sprite1, sprite2, sprite3 ]);

}

function restart() {

game.state.restart();

}

function gravity() {

game.physics.box2d.gravity.y = -300;

}

</script>

</body>

</html>

matts444 · August 27, 2015

resolved this by changing the gravityscale to a minus number, rather than changing the value of the physics.box2d.gravity.y

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Changing state with box2d - gravity

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