gradient.js

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

function preload() {

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

}

function create() {

    game.stage.backgroundColor = "#0c9fc7";

    /**
    * Interpolates the two given colours based on the supplied step and currentStep properties.
    *
    * @method Phaser.Color.interpolateColor
    * @static
    * @param {number} color1 - The first color value.
    * @param {number} color2 - The second color value.
    * @param {number} steps - The number of steps to run the interpolation over.
    * @param {number} currentStep - The currentStep value. If the interpolation will take 100 steps, a currentStep value of 50 would be half-way between the two.
    * @param {number} alpha - The alpha of the returned color.
    * @returns {number} The interpolated color value.
    */
    // interpolateColor: function (color1, color2, steps, currentStep, alpha) {

    var out = [];

    var bmd = game.add.bitmapData(800, 600);
    bmd.addToWorld();

    var y = 0;

    for (var i = 0; i < 30; i++)
    {
        var c = Phaser.Color.interpolateColor(0x66d973, 0x40b54d, 30, i);

        // console.log(Phaser.Color.getWebRGB(c));

        bmd.rect(0, y, 800, y+2, Phaser.Color.getWebRGB(c));

        out.push(Phaser.Color.getWebRGB(c));

        y += 2;
    }

    for (var i = 0; i < 60; i++)
    {
        var c = Phaser.Color.interpolateColor(0x40b54d, 0x1d962b, 60, i);

        // console.log(Phaser.Color.getWebRGB(c));

        bmd.rect(0, y, 800, y+2, Phaser.Color.getWebRGB(c));

        out.push(Phaser.Color.getWebRGB(c));

        y += 2;
    }

    // console.log(out);
    console.log(JSON.stringify(out));

}