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@@ -23,6 +23,8 @@
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</head>
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<body>
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<div class="g-doc">
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+ <canvas id="canvas" style="position: fixed;left: 0;top: 0; width: 100%;height: 100%;"></canvas>
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+
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<div class="popbg"></div>
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<div class="g-inner welcome">
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<button id="start_game" class="layui-btn btn-1" >匹配对手</button>
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@@ -106,5 +108,106 @@
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<script src="./js/common.js?v1"></script>
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<script type="text/javascript">
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common.init();
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+ "use strict";
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+
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+var canvas = document.getElementById('canvas'),
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+ ctx = canvas.getContext('2d'),
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+ w = canvas.width = window.innerWidth,
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+ h = canvas.height = window.innerHeight,
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+
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+ hue = 217,
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+ stars = [],
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+ count = 0,
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+ maxStars = 1200;
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+
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+var canvas2 = document.createElement('canvas'),
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+ ctx2 = canvas2.getContext('2d');
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+canvas2.width = 100;
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+canvas2.height = 100;
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+var half = canvas2.width / 2,
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+ gradient2 = ctx2.createRadialGradient(half, half, 0, half, half, half);
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+gradient2.addColorStop(0.025, '#fff');
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+gradient2.addColorStop(0.1, 'hsl(' + hue + ', 61%, 33%)');
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+gradient2.addColorStop(0.25, 'hsl(' + hue + ', 64%, 6%)');
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+gradient2.addColorStop(1, 'transparent');
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+
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+ctx2.fillStyle = gradient2;
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+ctx2.beginPath();
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+ctx2.arc(half, half, half, 0, Math.PI * 2);
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+ctx2.fill();
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+
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+// End cache
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+
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+function random(min, max) {
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+ if (arguments.length < 2) {
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+ max = min;
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+ min = 0;
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+ }
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+
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+ if (min > max) {
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+ var hold = max;
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+ max = min;
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+ min = hold;
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+ }
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+
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+ return Math.floor(Math.random() * (max - min + 1)) + min;
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+}
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+
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+function maxOrbit(x, y) {
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+ var max = Math.max(x, y),
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+ diameter = Math.round(Math.sqrt(max * max + max * max));
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+ return diameter / 2;
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+}
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+
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+var Star = function() {
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+
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+ this.orbitRadius = random(maxOrbit(w, h));
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+ this.radius = random(60, this.orbitRadius) / 12;
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+ this.orbitX = w / 2;
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+ this.orbitY = h / 2;
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+ this.timePassed = random(0, maxStars);
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+ this.speed = random(this.orbitRadius) / 900000;
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+ this.alpha = random(2, 10) / 10;
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+
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+ count++;
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+ stars[count] = this;
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+}
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+
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+Star.prototype.draw = function() {
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+ var x = Math.sin(this.timePassed) * this.orbitRadius + this.orbitX,
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+ y = Math.cos(this.timePassed) * this.orbitRadius + this.orbitY,
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+ twinkle = random(10);
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+
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+ if (twinkle === 1 && this.alpha > 0) {
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+ this.alpha -= 0.05;
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+ } else if (twinkle === 2 && this.alpha < 1) {
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+ this.alpha += 0.05;
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+ }
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+
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+ ctx.globalAlpha = this.alpha;
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+ ctx.drawImage(canvas2, x - this.radius / 2, y - this.radius / 2, this.radius, this.radius);
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+ this.timePassed += this.speed;
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+}
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+
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+for (var i = 0; i < maxStars; i++) {
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+ new Star();
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+}
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+
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+function animation() {
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+ ctx.globalCompositeOperation = 'source-over';
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+ ctx.globalAlpha = 0.8;
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+ ctx.fillStyle = 'hsla(' + hue + ', 64%, 6%, 1)';
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+ ctx.fillRect(0, 0, w, h)
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+
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+ ctx.globalCompositeOperation = 'lighter';
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+ for (var i = 1, l = stars.length; i < l; i++) {
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+ stars[i].draw();
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+ };
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+
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+ window.requestAnimationFrame(animation);
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+}
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+
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+animation();
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+
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</script>
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</html>
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