canvas实现文字圆形排列的方法
dearweb
发布：2021-10-21 15:07:06阅读：
canvas结合js实现文字圆形排列的方法；
效果预览
代码展示
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
</head>
<body>
<canvas
id="canvas"
width="300"
height="300"
data-total="100"
data-curr="75"
></canvas>
<script>
var canvas = document.getElementById('canvas')
var ctx = canvas.getContext('2d')
console.log(canvas.getContext)
//转换弧度
function rads(x) {
return (Math.PI * x) / 180
}
function drawCircularText(s, string, startAngle, endAngle) {
var radius = s.radius,
angleDecrement =
(startAngle - endAngle) / (string.length - 1),
angle = parseFloat(startAngle),
index = 0,
character
ctx.save()
ctx.fillStyle = 'black'
ctx.font = '30px 微软雅黑'
ctx.textAlign = 'right'
ctx.textBaseline = 'middle'
while (index < string.length) {
character = string.charAt(index)
ctx.save()
ctx.beginPath()
ctx.translate(
s.x + Math.cos(angle) * radius,
s.y + Math.sin(angle) * radius
)
ctx.rotate(Math.PI / 2 + angle)
ctx.fillText(character, 0, 0)
angle -= angleDecrement
index++
ctx.restore()
}
ctx.restore()
}
ctx.textAlign = 'center'
ctx.textBaseLine = 'middle'
if (canvas.getContext) {
var circle = {
x: 150,
y: 150,
radius: 100,
}
drawCircularText(circle, '123456', Math.PI * 2, Math.PI / 3)
}
//第三个参数表示文字首位是否相接 差了多少弧度
</script>
</body>
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