效果如圖
代碼如下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>test</title>
<style>
body {
display: flex;
flex-flow: column wrap;
justify-content: center;
align-items: center;
}
#c {
margin-top: 20px;
}
input[type=range]::before {content: attr(min); color: #000; padding-right: 5px;}
input[type=range]::after { content: attr(max); color: #000; padding-left: 5px;}
</style>
</head>
<body>
<canvas id="c">當前瀏覽器不支持canvas 請升級！</canvas>
<input type="range" name="range" min="0" max="100" step="1">
</body>
<script>
let canvas = document.getElementById("c")
let ctx = canvas.getContext("2d")
let oRange = document.getElementsByName("range")[0];
let M = Math
let Sin = M.sin
let Cos = M.cos
let Sqrt = M.sqrt
let Pow = M.pow
let PI = M.PI
let Round = M.round
let oW = canvas.width = 250
let oH = canvas.height = 250
let lineWidth = 2 // 線寬
let r = (oW / 2) // 大半徑
let cR = r - 10 * lineWidth
ctx.beginPath()
ctx.lineWidth = lineWidth
// 水波動畫初始參數
let axisLength = 2 * r - 16 * lineWidth // Sin 圖形長度
let unit = axisLength / 9 // 波浪寬
let range = .4 // 浪幅
let nowrange = range
let xoffset = 8 * lineWidth // x 軸偏移量
let data = ~~(oRange.value) / 100 // 數據量
let sp = 0 // 周期偏移量
let nowdata = 0
let waveupsp = 0.006 // 水波上漲速度
// 圓動畫初始參數
let arcStack = [] // 圓棧
let bR = r - 8 * lineWidth
let soffset = -(PI / 2) // 圓動畫起始位置
let circleLock = true // 起始動畫鎖
// 獲取圓動畫軌跡點集
for (var i = soffset; i < soffset + 2 * PI; i += 1 / (8 * PI)) {
arcStack.push([
r + bR * Cos(i),
r + bR * Sin(i)
])
}
// 圓起始點
let cStartPoint = arcStack.shift();
ctx.strokeStyle = "#1c86d1";
ctx.moveTo(cStartPoint[0], cStartPoint[1]);
// 開始渲染
render();
function drawSine() {
ctx.beginPath();
ctx.save();
var Stack = []; // 記錄起始點和終點坐標
for (var i = xoffset; i <= xoffset + axisLength; i += 20 / axisLength) {
var x = sp + (xoffset + i) / unit;
var y = Sin(x) * nowrange;
var dx = i;
var dy = 2 * cR * (1 - nowdata) + (r - cR) - (unit * y);
ctx.lineTo(dx, dy);
Stack.push([dx, dy])
}
// 獲取初始點和結束點
var startP = Stack[0]
var endP = Stack[Stack.length - 1]
ctx.lineTo(xoffset + axisLength, oW);
ctx.lineTo(xoffset, oW);
ctx.lineTo(startP[0], startP[1])
ctx.fillStyle = "#fbec99";
ctx.fill();
ctx.restore();
}
function drawText() {
ctx.globalCompositeOperation = 'source-over';
var size = 0.4 * cR;
ctx.font = 'bold ' + size + 'px Microsoft Yahei';
let txt = (nowdata.toFixed(2) * 100).toFixed(0) + '`%';
var fonty = r + size / 2;
var fontx = r - size * 0.8;
ctx.fillStyle = "#f6b71e";
ctx.textAlign = 'center';
ctx.fillText(txt, r + 5, r + 20)
}
//最外面淡黃色圈
function drawCircle() {
ctx.beginPath();
ctx.lineWidth = 15;
ctx.strokeStyle = '#fff89d';
ctx.arc(r, r, cR + 7, 0, 2 * Math.PI);
ctx.stroke();
ctx.restore();
}
//灰色圓圈
function grayCircle() {
ctx.beginPath();
ctx.lineWidth = 10;
ctx.strokeStyle = '#eaeaea';
ctx.arc(r, r, cR - 5, 0, 2 * Math.PI);
ctx.stroke();
ctx.restore();
ctx.beginPath();
}
//橘黃色進度圈
function orangeCircle() {
ctx.beginPath();
ctx.strokeStyle = '#fbdb32';
//使用這個使圓環兩端是圓弧形狀
ctx.lineCap = 'round';
ctx.arc(r, r, cR - 5, 0 * (Math.PI / 180.0) - (Math.PI / 2), (nowdata * 360) * (Math.PI / 180.0) - (Math.PI / 2));
ctx.stroke();
ctx.save()
}
//裁剪中間水圈
function clipCircle() {
ctx.beginPath();
ctx.arc(r, r, cR - 10, 0, 2 * Math.PI, false);
ctx.clip();
}
//渲染canvas
function render() {
ctx.clearRect(0, 0, oW, oH);
//最外面淡黃色圈
drawCircle();
//灰色圓圈
grayCircle();
//橘黃色進度圈
orangeCircle();
//裁剪中間水圈
clipCircle();
// 控制波幅
oRange.addEventListener("change", function() {
data = ~~(oRange.value) / 100;
}, 0);
if (data >= 0.85) {
if (nowrange > range / 4) {
var t = range * 0.01;
nowrange -= t;
}
} else if (data <= 0.1) {
if (nowrange < range * 1.5) {
var t = range * 0.01;
nowrange += t;
}
} else {
if (nowrange <= range) {
var t = range * 0.01;
nowrange += t;
}
if (nowrange >= range) {
var t = range * 0.01;
nowrange -= t;
}
}
if ((data - nowdata) > 0) {
nowdata += waveupsp;
}
if ((data - nowdata) < 0) {
nowdata -= waveupsp
}
sp += 0.07;
// 開始水波動畫
drawSine();
// 寫字
drawText();
requestAnimationFrame(render)
}
</script>
傳送門：https://github.com/guoyoujin/WaterMoire
傳送門：https://www.cnblogs.com/CyLee/p/10591011.html