Вращающаяся чёрная дыра на HTML5 Canvas
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<canvas id="particle"></canvas> <script> // Global Animation Setting window.requestAnimFrame = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function(callback) { window.setTimeout(callback, 1000 / 60); }; // Global Canvas Setting var canvas = document.getElementById('particle'); var ctx = canvas.getContext('2d'); canvas.width = window.innerWidth; canvas.height = window.innerHeight; // Particles Around the Parent function Particle(x, y, distance) { this.angle = Math.random() * 2 * Math.PI; this.radius = Math.random(); this.opacity = (Math.random() * 5 + 2) / 10; this.distance = (1 / this.opacity) * distance; this.speed = this.distance * 0.00001; this.position = { x: x + this.distance * Math.cos(this.angle), y: y + this.distance * Math.sin(this.angle) }; this.draw = function() { ctx.fillStyle = "rgba(255,255,255," + this.opacity + ")"; ctx.beginPath(); ctx.arc(this.position.x, this.position.y, this.radius, 0, Math.PI * 2, false); ctx.fill(); ctx.closePath(); } this.update = function() { this.angle += this.speed; this.position = { x: x + this.distance * Math.cos(this.angle), y: y + this.distance * Math.sin(this.angle) }; this.draw(); } } function Emitter(x, y) { this.position = { x: x, y: y }; this.radius = 50; this.count = 1000; this.particles = []; for (var i = 0; i < this.count; i++) { this.particles.push(new Particle(this.position.x, this.position.y, this.radius)); } } Emitter.prototype = { draw: function() { ctx.fillStyle = "rgba(0,0,0,1)"; ctx.beginPath(); ctx.arc(this.position.x, this.position.y, this.radius, 0, Math.PI * 2, false); ctx.fill(); ctx.closePath(); }, update: function() { for (var i = 0; i < this.count; i++) { this.particles[i].update(); } this.draw(); } } var emitter = new Emitter(canvas.width / 2, canvas.height / 2); function loop() { ctx.clearRect(0, 0, canvas.width, canvas.height); emitter.update(); requestAnimFrame(loop); } loop(); </script> |
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