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wave.html
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<!DOCTYPE HTML>
<html>
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title>wave</title>
<style type="text/css">
.wavelinebox{
width: 500px;
height: 300px;
border: 1px solid #f00;
}
.wl_horizontal {
width: 100%;
height: 10px;
background-image: -webkit-radial-gradient(circle, transparent, transparent 9px, orange 9px, orange 10px, transparent 10px, transparent);
background-image: -moz-radial-gradient(circle, transparent, transparent 9px, orange 9px, orange 10px, transparent 10px, transparent);
background-image: radial-gradient(circle, transparent, transparent 9px, orange 9px, orange 10px, transparent 10px, transparent);
background-size: 20px 20px;
}
.wl_vertical {
width: 10px;
height: 260px;
background-image: -webkit-radial-gradient(circle, transparent, transparent 9px, orange 9px, orange 10px, transparent 10px, transparent);
background-image: -moz-radial-gradient(circle, transparent, transparent 9px, orange 9px, orange 10px, transparent 10px, transparent);
background-image: radial-gradient(circle, transparent, transparent 9px, orange 9px, orange 10px, transparent 10px, transparent);
background-size: 20px 20px;
}
.wavebox{
width: 600px;
height: 600px;
border: 1px solid #f00;
}
canvas{
border: medium double black;
margin: 16px;
}
</style>
</head>
<body>
<!-- <div class="wavelinebox">
<div class="wl_horizontal"></div>
<div class="wl_vertical"></div>
</div> -->
<div class="wavebox">
<canvas id="wave" width="500" height="500"></canvas>
</div>
</body>
<script type="text/javascript">
var af
var ctx = document.getElementById('wave').getContext('2d')
ctx.clearRect(0, 0, 200, 200)
// 进度
var progress = 0.5
// 是否换向
var backleft = false, backright = false
// 圆心坐标
var circlePoint = [250, 250]
// 圆的半径
var circleR = 100
// 波浪摇晃度数
var range = 20 * (0.5 - Math.abs(0.5 - progress))
range = range <= 4 ? 3 : range
var leftrange = -2
var rightrange = range <= 4 ? 3 : 6
function draw () {
ctx.clearRect(0, 0, 500, 500)
// 有一位老人在重庆的电脑边画了一个圆
ctx.lineWidth = 16
ctx.strokeStyle = '#47a5fd'
ctx.beginPath()
ctx.arc(circlePoint[0], circlePoint[1], circleR + 8, 0, 2*Math.PI, false)
ctx.stroke()
// 进度点坐标
var thePoint = [circlePoint[0], circlePoint[1] + circleR - 2 * circleR * progress]
// 计算圆两边的点的坐标
if (backleft) {
if (leftrange < -range) {
backleft = false
leftrange = -range
} else {
leftrange -= range <= 4 ? .1 : .2
}
} else {
if (leftrange > range) {
backleft = true
leftrange = range
} else {
leftrange += range <= 4 ? .1 : .2
}
}
if (backright) {
if (rightrange < -range) {
backright = false
rightrange = -range
} else {
rightrange -= range <= 4 ? .1 : .2
}
} else {
if (rightrange > range) {
backright = true
rightrange = range
} else {
rightrange += range <= 4 ? .1 : .2
}
}
var deltaleft = Math.sqrt(Math.pow(circleR, 2) - Math.pow((circlePoint[0] - (thePoint[1] + leftrange)), 2))
var deltaright = Math.sqrt(Math.pow(circleR, 2) - Math.pow((circlePoint[0] - (thePoint[1] + rightrange)), 2))
var leftPoint = [thePoint[0] - deltaleft, thePoint[1] + leftrange]
var rightPoint = [thePoint[0] + deltaright, thePoint[1] + rightrange]
// 曲线控制点坐标
var cp1 = [thePoint[0], thePoint[1] - 6 * leftrange]
var cp2 = [thePoint[0], thePoint[1] + 6 * rightrange]
// 计算出圆两边点的弧度
var leftA = 90 * Math.PI / 180 + Math.asin(deltaleft / circleR)
var rightA = 90 * Math.PI / 180 - Math.asin(deltaright / circleR)
ctx.lineWidth = 2
ctx.strokeStyle = 'rgba(112,191,252, 0.8)'
ctx.fillStyle = 'rgba(112,191,252, 0.8)'
ctx.beginPath()
ctx.moveTo(leftPoint[0], leftPoint[1])
// ctx.lineTo(rightPoint[0], rightPoint[1])
// ctx.quadraticCurveTo(thePoint[0] - 0.2 * circleR, thePoint[1] - 0.5 * circleR, rightPoint[0], rightPoint[1])
ctx.bezierCurveTo(cp1[0], cp1[1], cp2[0], cp2[1], rightPoint[0], rightPoint[1])
// ctx.closePath()
if (progress < 0.5) {
ctx.arc(circlePoint[0], circlePoint[1], circleR, rightA, leftA, false)
} else {
ctx.arc(circlePoint[0], circlePoint[1], circleR, -rightA, -leftA, false)
}
ctx.fill()
ctx.stroke()
af = window.requestAnimationFrame(draw)
}
draw()
</script>
</html>