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HTML5仪表盘动画代码
<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>HTML5仪表盘动画代码</title>
<meta charset="utf-8">
<style>
html, body, div, canvas, a {
margin: 0px;
padding: 0px;
}
#app {
width: 550px;
height: 760px;
margin: 0px auto;
padding: 32px;
}
</style>
</head>
<body>
<div id="app">
<canvas id="canvas" width="262" height="262"></canvas>
</div>
<script type="text/javascript">
function Dot() {
this.x = 0;
this.y = 0;
this.draw = function (ctx) {
ctx.save();
ctx.beginPath();
ctx.fillStyle = 'rgba(255, 255, 255, 1)';
ctx.arc(this.x, this.y, 5, 0, Math.PI * 2, false);
ctx.fill();
ctx.lineWidth = 1;
ctx.strokeStyle = "rgba(246, 5, 51, 1)";
ctx.stroke();
ctx.restore();
ctx.save();
ctx.beginPath();
ctx.fillStyle = 'rgba(246, 5, 51, 1)';
ctx.arc(this.x, this.y, 3, 0, Math.PI * 2, false);
ctx.fill();
ctx.restore();
};
}
function innerDot() {
this.x = 0;
this.y = 0;
this.draw = function (ctx) {
ctx.save();
ctx.beginPath();
ctx.fillStyle = 'rgba(91,66,214,.12)';
ctx.arc(this.x, this.y, 6, 0, Math.PI * 2, false);
ctx.fill();
ctx.restore();
};
}
function setColorTick() {
this.draw = function (ctx) {
ctx.save();
for (var i = 0; i <= this.index; i ) {
var strokeLineWidth = 2
if (i == this.index) {
strokeLineWidth = 4
}
ctx.beginPath();
ctx.lineWidth = strokeLineWidth;
ctx.strokeStyle = this.gradientColorArr[i];
ctx.moveTo(113, 0);
ctx.lineTo(88, 0);
ctx.stroke();
ctx.rotate(this.deg1);
}
ctx.restore();
}
}
var Gauge = function (options) {
var properties = {
canvas: null,
percent: 0,
score: 50,
radius: 121, //外层圆半径
lineNums: 50, //外环指针线数量
innerLineNums: 50 * 3 / 2, //内环刻度线数量
totalScore: 100,
color: [[54, 63, 255], [134, 37, 168], [252, 3, 44]], //渐变色数组,渐变顺序从左到右
opacity: 0.6,//渐变色透明度
colorLineNums: 25, //外环彩色刻度数量 = (分数 / 总分数) * 刻度数 = (score / totalScore) * lineNums
}
this.mergeOptions(properties, options);
this.canvas = options.canvas;
this._percent = options.percent || 0;
this.colorLineNums = this.score / 100 * this.lineNums;
//弧长计算公式是一个数学公式，为L=n（圆心角度数）× π（1）× r（半径）/180（角度制），L=α（弧度）× r(半径) （弧度制）。其中n是圆心角度数，r是半径，L是圆心角弧长。
//整个运动的角度是（360-120）度，转换成弧度就是12π/9，一共分成了50个分数段，那么每一个分数段就是12π/450 = 2π / 75
//如需旋转 5 度，可规定下面的公式：5*Math.PI/180。
this.deg1 = (Math.PI * 12) / (9 * this.lineNums);
return this;
}
Gauge.prototype = {
mergeOptions: function (defaultOpt, options) {
var _this = this;
var list = Object.keys(defaultOpt);
list.forEach(function (key) {
_this[key] = typeof options[key] === 'undefined' ? defaultOpt[key] : options[key];
});
},
//彩色刻度线颜色数组
gradientColorArr: function () {
var colorArr = [],
colorObj1 = this.getRGBDiff(this.color[0], this.color[2]),
colorObj2 = this.getRGBDiff(this.color[1], this.color[2])
for (var i = 0; i < this.colorLineNums; i ) {
//计算每一步的hex值
[sR, sG, sB, startR, startG, startB, hex] = [colorObj1.sR, colorObj1.sG, colorObj1.sB, colorObj1.startR, colorObj1.startG, colorObj1.startB, '']
if (i > this.colorLineNums / 2) {
[sR, sG, sB, startR, startG, startB] = [colorObj2.sR, colorObj2.sG, colorObj2.sB, colorObj2.startR, colorObj2.startG, colorObj2.startB]
}
hex = this.colorToHex('rgba(' parseInt((sR * i startR)) ',' parseInt((sG * i startG)) ',' parseInt((sB * i startB)) ',' this.opacity ')');
colorArr.push(hex);
}
return colorArr;
},
getRGBDiff: function (r1, r2) {
var obj = {
sR: (r2[0] - r1[0]) / 25,
//总差值
sG: (r2[1] - r1[1]) / 25,
sB: (r2[2] - r1[2]) / 25,
startR: r1[0],
startG: r1[1],
startB: r1[2]
}
return obj;
},
colorToHex: function (rgb) {
var _this = rgb;
var reg = /^#([0-9a-fA-f]{3}|[0-9a-fA-f]{6})$/;
if (/^(rgb|RGB)/.test(_this)) {
var aColor = _this.replace(/(?:(|)|rgb|RGB)*/g, "").split(",");
var strHex = "#";
for (var i = 0; i < aColor.length; i ) {
var hex = Number(aColor[i]).toString(16);
hex = hex < 10 ? 0 '' hex : hex; // 保证每个rgb的值为2位
if (hex === "0") {
hex = hex;
}
strHex = hex;
}
if (strHex.length !== 7) {
strHex = _this;
}
return strHex;
} else if (reg.test(_this)) {
var aNum = _this.replace(/#/, "").split("");
if (aNum.length === 6) {
return _this;
} else if (aNum.length === 3) {
var numHex = "#";
for (var i = 0; i < aNum.length; i = 1) {
numHex = (aNum[i] aNum[i]);
}
return numHex;
}
} else {
return _this;
}
},
//内部文本
drawText: function (ctx, process) {
ctx.save();
ctx.rotate(210 * Math.PI / 180);
ctx.fillStyle = '#000';
ctx.font = '44px Microsoft yahei';
ctx.textAlign = 'center';
ctx.textBaseLine = 'top';
ctx.fillText(process, 0, 10);
var width = ctx.measureText(process).width;
ctx.fillStyle = '#000';
ctx.font = '20px Microsoft yahei';
ctx.fillText('分', width / 2 10, 10);
ctx.restore();
},
render: function () {
var canvas = this.canvas,
ctx = canvas.getContext('2d'),
cWidth = canvas.width,
cHeight = canvas.height,
score = this.score,
radius = this.radius,
deg1 = this.deg1,
$this = this;
//外环动点
var dot = new Dot(),
//内环动点
dot2 = new innerDot(),
//数字增加速度
dotSpeed = 0.04,
//数字增加的值 : deg1:每旋转一个线的弧度,共50根线,数值为100,所以数字速度等于 旋转角度 * 2
textSpeed = Math.round(dotSpeed * 2 / deg1),
//外环动点旋转角度
angle = 0,
//内环动点旋转角度
innerAngle = 0,
//起始分数,数字递增用
credit = 0,
colorTick = new setColorTick(),
colorIndex = 0,
colorSpeed = dotSpeed / deg1; //彩色刻度速度: 动点旋转速度 / 弧度
//色彩段数与彩色刻度条保持一致,线条无间隔,所以段数 * 2
var gradient = ctx.createLinearGradient(0, 0, 100, 0);
gradient.addColorStop("0", "rgba(252,3,44,.6)");
gradient.addColorStop("0.5", "rgba(134,37,168,.6)");
gradient.addColorStop("1.0", "rgba(54,63,255,.6)");
(function drawFrame() {
ctx.save();
ctx.clearRect(0, 0, cWidth, cHeight);
ctx.translate(cWidth / 2, cHeight / 2);
//因圆本身缺口为120°,为了让缺口朝正下方,所以旋转角度为150°
ctx.rotate(150 * Math.PI / 180);
dot.x = radius * Math.cos(angle);
dot.y = radius * Math.sin(angle);
var aim = score * deg1 / 2;
if (angle < aim) {
angle = dotSpeed; //动点旋转速度
}
dot.draw(ctx);
//内环动点坐标
//dot2.x = 81 * Math.cos(innerAngle);
//dot2.y = 81 * Math.sin(innerAngle);
//内环 动点无限循环
//if (true) {
// innerAngle = dotSpeed / 2
//}
//dot2.draw(ctx);
if (credit < score - textSpeed) {
credit = textSpeed;
} else if (credit >= score - textSpeed && credit < score) {
credit = 1;
}
$this.drawText(ctx, credit);
//外环渐变线
ctx.save();
ctx.beginPath();
ctx.lineWidth = 2;
ctx.strokeStyle = gradient;
ctx.arc(0, 0, radius, 0, angle, false);
ctx.stroke();
ctx.restore();
//
ctx.save();
//外环灰色线
for (var i = 0; i <= $this.lineNums; i ) {
ctx.beginPath();
ctx.lineWidth = 2;
ctx.strokeStyle = 'rgba(155,157,183,1)';
ctx.moveTo(113, 0);
ctx.lineTo(88, 0);
ctx.stroke();
ctx.rotate(deg1);
}
ctx.restore();
if (colorIndex < score / 2) {
colorIndex = colorSpeed;
}
try {
colorTick.gradientColorArr = $this.gradientColorArr();
colorTick.deg1 = deg1;
colorTick.index = colorIndex;
colorTick.draw(ctx);
} catch (e) { }
if (colorIndex < score / 2) window.requestAnimationFrame(drawFrame);
// 细分内环刻度线 : 圆线
//ctx.save();
//for (var i = 0; i <= $this.innerLineNums; i ) {
// ctx.beginPath();
// ctx.lineWidth = 2;
// ctx.strokeStyle = 'rgba(155,157,183,1)';
// ctx.moveTo(82, 0);
// ctx.lineTo(80, 0);
// ctx.stroke();
// //每个点的弧度,360°弧度为2π,即旋转弧度为 2π / 75
// ctx.rotate(2 * Math.PI / $this.innerLineNums);
//}
//ctx.restore();
// 内环刻度线
ctx.save();
for (var i = 0; i < 6; i ) {
ctx.beginPath();
ctx.lineWidth = 2;
ctx.strokeStyle = 'rgba(155,157,183,1)';
ctx.moveTo(82, 0);
ctx.lineTo(78, 0);
ctx.stroke();
//每10个点分一个刻度,共5个刻度,旋转角度为deg1 * 10
ctx.rotate(deg1 * 10);
}
ctx.restore();
//内环数量刻度
ctx.save();
ctx.rotate(Math.PI / 2);
for (i = 0; i < 6; i ) {
ctx.fillStyle = 'rgba(165,180,198, .4)';
ctx.font = '10px Microsoft yahei';
ctx.textAlign = 'center';
ctx.fillText(20 * i, 0, -65);
ctx.rotate(deg1 * 10);
}
ctx.restore();
ctx.restore();
})();
},
update: function (value) {
this.score = value;
this.render();
}
}
</script>
<script>
var my_canvas = document.getElementById("canvas");
var gauge = new Gauge({
"canvas": my_canvas
})
// 绘制初始仪表盘初始值0%
gauge.render();
setTimeout(function () {
gauge.update(85);
}, 2000)
</script>
</body></html>