phaser/examples/tilemaps/randomise tiles.js

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

function preload() {

    game.load.tilemap('desert', 'assets/tilemaps/maps/desert.json', null, Phaser.Tilemap.TILED_JSON);
    game.load.image('tiles', 'assets/tilemaps/tiles/tmw_desert_spacing.png');
    game.load.image('car', 'assets/sprites/car90.png');

}

var map;
var layer;

var cursors;
var sprite;
var marker;

function create() {

    map = game.add.tilemap('desert');

    map.addTilesetImage('Desert', 'tiles');

    layer = map.createLayer('Ground');

    layer.resizeWorld();

    marker = game.add.graphics();
    marker.lineStyle(2, 0x00bff3, 1);
    marker.drawRect(0, 0, 32 * 6, 32 * 6);

    sprite = game.add.sprite(450, 80, 'car');
    sprite.anchor.setTo(0.5, 0.5);

    game.camera.follow(sprite);

    cursors = game.input.keyboard.createCursorKeys();


    game.input.onDown.add(randomiseTiles, this);

}

function randomiseTiles() {

    map.random(layer.getTileX(sprite.x), layer.getTileY(sprite.y), 6, 6);

}

function update() {

    marker.x = layer.getTileX(sprite.x) * 32;
    marker.y = layer.getTileY(sprite.y) * 32;

    sprite.body.velocity.x = 0;
    sprite.body.velocity.y = 0;
    sprite.body.angularVelocity = 0;

    if (cursors.left.isDown)
    {
        sprite.body.angularVelocity = -200;
    }
    else if (cursors.right.isDown)
    {
        sprite.body.angularVelocity = 200;
    }

    if (cursors.up.isDown)
    {
        sprite.body.velocity.copyFrom(game.physics.velocityFromAngle(sprite.angle, 300));
    }

}

function render() {

    game.debug.text('Click to randomise tiles', 32, 32, 'rgb(0,0,0)');
    game.debug.text('Tile X: ' + layer.getTileX(sprite.x), 32, 48, 'rgb(0,0,0)');
    game.debug.text('Tile Y: ' + layer.getTileY(sprite.y), 32, 64, 'rgb(0,0,0)');

}