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https://github.com/photonstorm/phaser
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100 lines
2.6 KiB
JavaScript
100 lines
2.6 KiB
JavaScript
// This example was created by Jens Anders Bakke
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var game = new Phaser.Game(800, 600, Phaser.AUTO, 'phaser-example', { preload: preload, create: create });
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function preload() {
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game.load.spritesheet('snowflakes', 'assets/sprites/snowflakes.png', 17, 17);
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game.load.spritesheet('snowflakes_large', 'assets/sprites/snowflakes_large.png', 64, 64);
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}
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var max = 0;
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var front_emitter;
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var mid_emitter;
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var back_emitter;
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var update_interval = 4 * 60;
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var i = 0;
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function create() {
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back_emitter = game.add.emitter(game.world.centerX, -32, 600);
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back_emitter.makeParticles('snowflakes', [0, 1, 2, 3, 4, 5]);
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back_emitter.maxParticleScale = 0.6;
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back_emitter.minParticleScale = 0.2;
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back_emitter.setYSpeed(20, 100);
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back_emitter.gravity = 0;
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back_emitter.width = game.world.width * 1.5;
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back_emitter.minRotation = 0;
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back_emitter.maxRotation = 40;
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mid_emitter = game.add.emitter(game.world.centerX, -32, 250);
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mid_emitter.makeParticles('snowflakes', [0, 1, 2, 3, 4, 5]);
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mid_emitter.maxParticleScale = 1.2;
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mid_emitter.minParticleScale = 0.8;
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mid_emitter.setYSpeed(50, 150);
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mid_emitter.gravity = 0;
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mid_emitter.width = game.world.width * 1.5;
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mid_emitter.minRotation = 0;
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mid_emitter.maxRotation = 40;
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front_emitter = game.add.emitter(game.world.centerX, -32, 50);
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front_emitter.makeParticles('snowflakes_large', [0, 1, 2, 3, 4, 5]);
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front_emitter.maxParticleScale = 1;
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front_emitter.minParticleScale = 0.5;
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front_emitter.setYSpeed(100, 200);
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front_emitter.gravity = 0;
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front_emitter.width = game.world.width * 1.5;
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front_emitter.minRotation = 0;
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front_emitter.maxRotation = 40;
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changeWindDirection();
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back_emitter.start(false, 14000, 20);
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mid_emitter.start(false, 12000, 40);
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front_emitter.start(false, 6000, 1000);
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}
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function update() {
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i++;
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if (i === update_interval)
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{
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changeWindDirection();
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update_interval = Math.floor(Math.random() * 20) * 60; // 0 - 20sec @ 60fps
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i = 0;
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}
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}
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function changeWindDirection() {
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var multi = Math.floor((max + 200) / 4),
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frag = (Math.floor(Math.random() * 100) - multi);
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max = max + frag;
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if (max > 200) max = 150;
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if (max < -200) max = -150;
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setXSpeed(back_emitter, max);
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setXSpeed(mid_emitter, max);
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setXSpeed(front_emitter, max);
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}
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function setXSpeed(emitter, max) {
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emitter.setXSpeed(max - 20, max);
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emitter.forEachAlive(setParticleXSpeed, this, max);
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}
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function setParticleXSpeed(particle, max) {
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particle.body.velocity.x = max - Math.floor(Math.random() * 30);
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}
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