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canvas-growth-radius.html
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canvas-growth-radius.html
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<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset=utf-8>
<title>demo</title>
</head>
<style type="text/css">
* {
margin: 0;
padding: 0;
}
.wrapper{
height: 800px;
width: 600px;
position: relative;
}
#myCanvasBackGround{
position: absolute;
top: 0;
left: 0;
color: #ddd;
z-index: 8;
}
#myCanvas{
position: absolute;
top: 0;
left: 0;
z-index: 9;
}
.point-wrapper{
position: absolute;
z-index: 10;
width: 10px;
height: 10px;
background-color: #fff;
border-radius: 50%;
display: none;
border: 8px solid #d1ba70;
}
.point-gold-wrapper{
position: absolute;
z-index: 10;
width: 10px;
height: 10px;
background-color: #d1ba6f;
border-radius: 50%;
display: none;
}
.point-gold-wrapper::after,.point-gold-wrapper::before{
position: absolute;
width: 100px;
font-size: 22px;
right: -130px;
text-align: left;
top: 0;
color: #fff;
}
.drop-left::after,.drop-left::before{
position: absolute;
width: 100px;
font-size: 22px;
left: -130px;
text-align: right;
top: 0;
color: #fff;
}
</style>
<script type="text/javascript" src="./js/jquery-1.10.2.min.js"></script>
<body>
<div class='wrapper'>
<canvas id="myCanvasBackGround"></canvas>
<div class="point-wrapper"></div>
<div class="point-gold-wrapper"></div>
<canvas id="myCanvas"></canvas>
</div>
<script type="text/javascript">
/*
* canvas弧形增长函数
* (x,y)圆心坐标
* r 半径
* percent 增长的百分比
*/
function drawGrowthCircle(percent) {
var canvas = document.getElementById('myCanvas');
var g = canvas.getContext('2d');
// 使画布的宽度和高度始终与终端屏幕宽度相等（canvas不支持rem）
var clientWidth = document.documentElement.clientWidth;
var canvasWidth = Math.floor(clientWidth);
canvas.setAttribute('width', canvasWidth + 'px');
canvas.setAttribute('height', canvasWidth + 'px');
var x = roundNum(canvasWidth / 2);
var y = roundNum(canvasWidth / 2 + clientWidth * 16 / 375);
var r = roundNum(clientWidth * 23 / 75);
var linewidth = roundNum(clientWidth * 4 / 375);
var start = new Date().getTime();
drawBackGround(x, y, r, canvasWidth, linewidth);
function roundNum(num) {
return (0.5 + num) << 0;
}
function draw() {
g.clearRect(0, 0, canvas.width, canvas.height);
var t = (new Date().getTime() - start) / 1000;
var circles = t / 2;
//终止位置
var ended = (0.75 + 1.5 * (percent / 360)) * Math.PI * Math.min(circles, 1);
// 超出弧度的范围return掉
if (ended < 0.75 * Math.PI || ended > 2.25 * Math.PI) {
window.requestAnimationFrame(draw);
return;
}
// 到达终点时 画弧 && cancelAnimationFrame
if (circles > 1 || circles === 1) {
drawPath(x, y, r, ended);
window.cancelAnimationFrame(draw);
return;
}
if (ended < 1.5 * Math.PI) {
var xPoint = x - Math.abs(r * Math.cos(ended));
var yPoint = y + r * Math.sin(ended);
} else {
var xPoint = x + Math.abs(r * Math.cos(ended));
var yPoint = y + r * Math.sin(ended);
}
drawPath(x, y, r, ended, linewidth);
// point
var pointOff = $('.point-wrapper').width() / 2 + 4;
$('.point-wrapper').css({'left': xPoint - pointOff, 'top': yPoint - pointOff});
$('.point-wrapper').show();
window.requestAnimationFrame(draw);
}
function drawPath(x, y, r, ended, linewidth) {
// 设置渐变
var gradient = g.createLinearGradient(0, 0, 0, r);
gradient.addColorStop('0', '#d1ba70');
gradient.addColorStop('0.5', 'white');
gradient.addColorStop('1.0', '#d1ba70');
// 中心
g.beginPath();
g.arc(x, y, r, 0.75 * Math.PI, ended);
g.lineWidth = linewidth;
g.strokeStyle = gradient;
g.stroke();
g.closePath();
}
draw();
}
/*
* canvas弧形轨道
* (x,y)圆心坐标
* r 半径
* 内圆轨道和外层细圆以及黄金会员分隔值点
*/
function drawBackGround(x, y, r, canvasWidth, linewidth) {
var canvasBack = document.getElementById('myCanvasBackGround');
var gBack = canvasBack.getContext('2d');
canvasBack.setAttribute('width', canvasWidth + 'px');
canvasBack.setAttribute('height', canvasWidth + 'px');
gBack.beginPath();
gBack.arc(x, y, r, 0.75 * Math.PI, Math.PI * 2.25);
gBack.lineWidth = linewidth;
gBack.strokeStyle = 'rgba(0, 0, 0, 0.5)';
gBack.stroke();
gBack.closePath();
gBack.beginPath();
gBack.arc(x, y, r + 13, 0.75 * Math.PI, Math.PI * 2.25);
// gBack.lineWidth = canvasWidth / 375;
gBack.lineWidth = 1.3;
gBack.strokeStyle = 'rgba(209, 186, 111, 0.5)';
gBack.stroke();
gBack.closePath();
var goldPer = 700 / 1000;
var finalPos = (0.75 + 1.5 * goldPer) * Math.PI;
var gxPoint = '';
var gyPoint = '';
// 黄金分值点(第三象限)
if (finalPos > 1.5 * Math.PI) {
gxPoint = x + Math.abs((r + 13) * Math.cos(finalPos));
gyPoint = y + (r + 13) * Math.sin(finalPos);
// 第二象限
} else {
gxPoint = x - Math.abs((r + 13) * Math.cos(finalPos));
gyPoint = y + (r + 13) * Math.sin(finalPos);
$('.point-gold-wrapper').addClass('drop-left');
}
// 黄金分值点div
var goldOff = $('.point-gold-wrapper').width() / 2;
$('.point-gold-wrapper').css({'left': gxPoint - goldOff, 'top': gyPoint - goldOff});
$('.point-gold-wrapper').show();
}
drawGrowthCircle(240);
</script>
</body>
</html>