canvas仿芝麻信用分仪表盘
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta charset="UTF-8" name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1,user-scalable=no">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="HandheldFriendly" content="true">
<title>征信分数</title>
<style>
html, body {
width: 100%;
height: 100%;
margin: 0;
}
canvas {
display: block;
border: 1px solid #eee;
position: relative;
left: 50%;
top: 50%;
transform: translate(-50%, -50%);
background: -webkit-linear-gradient(top, #0e83f5 0%, #21bdf6 100%);
background: -ms-linear-gradient(top, #0e83f5 0%, #21bdf6 100%);
background: -moz-linear-gradient(top, #0e83f5 0%, #21bdf6 100%);
background: linear-gradient(top, #0e83f5 0%, #21bdf6 100%);
}
</style>
</head>
<body style="height: 100%;width: 100%;margin: 0;padding: 0;">
<canvas id="canvas" data-score='700' data-time='2018.06.01'></canvas>
</body>
<script>
var canvas=document.getElementById('canvas');
function getViewPort(){
var viewHeight=window.innerHeight||document.documentElement.clientHeight;
var viewWidth=window.innerWidth||document.documentElement.clientWidth;
document.body.style.width=viewWidth;
canvas.width=viewWidth;
canvas.height=viewHeight;
}
getViewPort();
</script>
<script>
window.onload = function () {
var canvas = document.getElementById('canvas'),
ctx = canvas.getContext('2d'),
cWidth = canvas.width,
cHeight = canvas.height,
score = canvas.attributes['data-score'].value,
stime = canvas.attributes['data-time'].value,
stage = ['较差', '中等', '良好', '优秀', '极好'],
radius = 150,
deg0 = Math.PI / 9,
deg1 = Math.PI * 11 / 45;
if (score < 400 || score > 900) {
alert('信用分数区间：400~900');
} else {
var dot = new Dot(),
dotSpeed = 0.03,
textSpeed = Math.round(dotSpeed * 100 / deg1),
angle = 0,
credit = 400;
(function drawFrame() {
ctx.save();
ctx.clearRect(0, 0, cWidth, cHeight);
ctx.translate(cWidth / 2, cHeight / 2);
ctx.rotate(8 * deg0);
dot.x = radius * Math.cos(angle);
dot.y = radius * Math.sin(angle);
var aim = (score - 400) * deg1 / 100;
if (angle < aim) {
angle += dotSpeed;
}
dot.draw(ctx);
if (credit < score - textSpeed) {
credit += textSpeed;
} else if (credit >= score - textSpeed && credit < score) {
credit += 1;
}
text(credit);
ctx.save();
ctx.beginPath();
ctx.lineWidth = 3;
ctx.strokeStyle = 'rgba(255, 255, 255, .5)';
ctx.arc(0, 0, radius, 0, angle, false);
ctx.stroke();
ctx.restore();
window.requestAnimationFrame(drawFrame);
ctx.save(); //中间刻度层
ctx.beginPath();
ctx.strokeStyle = 'rgba(255, 255, 255, .2)';
ctx.lineWidth = 10;
ctx.arc(0, 0, 135, 0, 11 * deg0, false);
ctx.stroke();
ctx.restore();
ctx.save(); // 刻度线
for (var i = 0; i < 6; i++) {
ctx.beginPath();
ctx.lineWidth = 2;
ctx.strokeStyle = 'rgba(255, 255, 255, .3)';
ctx.moveTo(140, 0);
ctx.lineTo(130, 0);
ctx.stroke();
ctx.rotate(deg1);
}
ctx.restore();
ctx.save(); // 细分刻度线
for (i = 0; i < 25; i++) {
if (i % 5 !== 0){
ctx.beginPath();
ctx.lineWidth = 2;
ctx.strokeStyle = 'rgba(255, 255, 255, .1)';
ctx.moveTo(140, 0);
ctx.lineTo(133, 0);
ctx.stroke();
}
ctx.rotate(deg1 / 5);
}
ctx.restore();
ctx.save(); //信用分数
ctx.rotate(Math.PI / 2);
for (i = 0; i < 6; i++) {
ctx.fillStyle = 'rgba(255, 255, 255, .4)';
ctx.font = '10px Microsoft yahei';
ctx.textAlign = 'center';
ctx.fillText(400 + 100 * i, 0, -115);
ctx.rotate(deg1);
}
ctx.restore();
ctx.save(); //分数段
ctx.rotate(Math.PI / 2 + deg0);
for (i = 0; i < 5; i++) {
ctx.fillStyle = 'rgba(255, 255, 255, .4)';
ctx.font = '10px Microsoft yahei';
ctx.textAlign = 'center';
ctx.fillText(stage[i], 5, -115);
ctx.rotate(deg1);
}
ctx.restore();
ctx.save(); //信用阶段及评估时间文字
ctx.rotate(10 * deg0);
ctx.fillStyle = '#fff';
ctx.font = '28px Microsoft yahei';
ctx.textAlign = 'center';
if (score < 500) {
ctx.fillText('信用较差', 0 , 60);
} else if (score < 600 && score >= 500) {
ctx.fillText('信用中等', 0 , 60);
} else if (score < 700 && score >= 600) {
ctx.fillText('信用良好', 0 , 60);
} else if (score < 800 && score >= 700) {
ctx.fillText('信用优秀', 0 , 60);
} else if (score <= 900 && score >= 800) {
ctx.fillText('信用极好', 0 , 60);
}
ctx.fillStyle = '#80cbfa';
ctx.font = '14px Microsoft yahei';
ctx.fillText('评估时间：'+stime, 0, 80);
ctx.fillStyle = '#7ec5f9';
ctx.font = '14px Microsoft yahei';
ctx.fillText('BETA', 0, -60);
ctx.restore();
// ctx.save(); //最外层轨道
ctx.beginPath();
ctx.strokeStyle = 'rgba(255, 255, 255, .4)';
ctx.lineWidth = 3;
ctx.arc(0, 0, radius, 0, 11 * deg0, false);
ctx.stroke();
ctx.restore();
})();
}
function Dot() {
this.x = 0;
this.y = 0;
this.draw = function (ctx) {
ctx.save();
ctx.beginPath();
ctx.fillStyle = 'rgba(255, 255, 255, .7)';
ctx.arc(this.x, this.y, 3, 0, Math.PI * 2, false);
ctx.fill();
ctx.restore();
};
}
function text(process) {
ctx.save();
ctx.rotate(10 * deg0);
ctx.fillStyle = '#fff';
ctx.font = '80px Microsoft yahei';
ctx.textAlign = 'center';
ctx.textBaseLine = 'top';
ctx.fillText(process, 0 ,10);
ctx.restore();
}
};
</script>
</html>
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