Difference between revisions of "Template:CIEI-BJ"

Line 40: Line 40:
  
 
<body>
 
<body>
 +
 +
<script>
 +
//定义画布宽高和生成点的个数
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var WIDTH = window.innerWidth, HEIGHT = window.innerHeight, POINT = 35;
 +
 +
var canvas = document.getElementById('Mycanvas');
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canvas.width = WIDTH,
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canvas.height = HEIGHT;
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var context = canvas.getContext('2d');
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context.strokeStyle = 'rgba(0,0,0,0.2)',
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context.strokeWidth = 1,
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context.fillStyle = 'rgba(0,0,0,0.1)';
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var circleArr = [];
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 +
//线条：开始xy坐标，结束xy坐标，线条透明度
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function Line (x, y, _x, _y, o) {
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this.beginX = x,
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this.beginY = y,
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this.closeX = _x,
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this.closeY = _y,
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this.o = o;
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}
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//点：圆心xy坐标，半径，每帧移动xy的距离
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function Circle (x, y, r, moveX, moveY) {
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this.x = x,
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this.y = y,
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this.r = r,
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this.moveX = moveX,
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this.moveY = moveY;
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}
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//生成max和min之间的随机数
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function num (max, _min) {
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var min = arguments[1] || 0;
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return Math.floor(Math.random()*(max-min+1)+min);
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}
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// 绘制原点
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function drawCricle (cxt, x, y, r, moveX, moveY) {
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var circle = new Circle(x, y, r, moveX, moveY)
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cxt.beginPath()
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cxt.arc(circle.x, circle.y, circle.r, 0, 2*Math.PI)
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cxt.closePath()
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cxt.fill();
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return circle;
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}
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//绘制线条
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function drawLine (cxt, x, y, _x, _y, o) {
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var line = new Line(x, y, _x, _y, o)
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cxt.beginPath()
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cxt.strokeStyle = 'rgba(0,0,0,'+ o +')'
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cxt.moveTo(line.beginX, line.beginY)
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cxt.lineTo(line.closeX, line.closeY)
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cxt.closePath()
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cxt.stroke();
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}
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//初始化生成原点
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function init () {
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circleArr = [];
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for (var i = 0; i < POINT; i++) {
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circleArr.push(drawCricle(context, num(WIDTH), num(HEIGHT), num(15, 2), num(10, -10)/40, num(10, -10)/40));
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}
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draw();
 +
}
 +
 +
//每帧绘制
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function draw () {
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context.clearRect(0,0,canvas.width, canvas.height);
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for (var i = 0; i < POINT; i++) {
 +
drawCricle(context, circleArr[i].x, circleArr[i].y, circleArr[i].r);
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}
 +
for (var i = 0; i < POINT; i++) {
 +
for (var j = 0; j < POINT; j++) {
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if (i + j < POINT) {
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var A = Math.abs(circleArr[i+j].x - circleArr[i].x),
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B = Math.abs(circleArr[i+j].y - circleArr[i].y);
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var lineLength = Math.sqrt(A*A + B*B);
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var C = 1/lineLength*7-0.009;
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var lineOpacity = C > 0.03 ? 0.03 : C;
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if (lineOpacity > 0) {
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drawLine(context, circleArr[i].x, circleArr[i].y, circleArr[i+j].x, circleArr[i+j].y, lineOpacity);
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}
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}
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}
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}
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}
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 +
//调用执行
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window.onload = function () {
 +
init();
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setInterval(function () {
 +
for (var i = 0; i < POINT; i++) {
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var cir = circleArr[i];
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cir.x += cir.moveX;
 +
cir.y += cir.moveY;
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if (cir.x > WIDTH) cir.x = 0;
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else if (cir.x < 0) cir.x = WIDTH;
 +
if (cir.y > HEIGHT) cir.y = 0;
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else if (cir.y < 0) cir.y = HEIGHT;
 +
 +
}
 +
draw();
 +
}, 16);
 +
}
 +
 +
</script>
 
<h1>Team CIEI_BJ</h1>
 
<h1>Team CIEI_BJ</h1>
 
<nav class="navbar navbar-default navbar-inverse">
 
<nav class="navbar navbar-default navbar-inverse">
Line 76: Line 181:
 
   <!-- /.container-fluid -->  
 
   <!-- /.container-fluid -->  
 
</nav>
 
</nav>
 +
 
<p>
 
<p>
  

Revision as of 13:31, 6 October 2016

`Template

Team CIEI_BJ