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canvas 二次方贝赛尔曲线 打点
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<!DOCTYPE html> | |
<html> | |
<head> | |
<script src="https://code.jquery.com/jquery-1.9.1.min.js"></script> | |
<meta charset="utf-8"> | |
<title>JS Bin</title> | |
</head> | |
<script> | |
function quadraticBzier(p, p0, p1, p2){ | |
return Math.pow(1-p,2)*p0 +2*p*(1-p)*p1+Math.pow(p,2)*p2; | |
} | |
jQuery(function(){ | |
var $c = $('#canvas'); | |
var c = $c.get(0).getContext('2d'); | |
c.fillStyle = '#CC0065'; | |
c.beginPath(); | |
c.arc(100, 200, 5, 0, Math.PI * 2, true); | |
c.fill(); | |
c.beginPath(); | |
c.arc(300, 10, 5, 0, Math.PI * 2, true); | |
c.fill(); | |
c.beginPath(); | |
c.arc(500, 200, 5, 0, Math.PI * 2, true); | |
c.fill(); | |
c.fillStyle = 'white'; | |
for(var i=0.05;i<=1;i+=0.05){ | |
c.beginPath(); | |
c.arc(quadraticBzier(i, 100,300,500), quadraticBzier(i, 200,10,200), 5, 0, Math.PI * 2, true); | |
c.fill(); | |
} | |
}); | |
</script> | |
<body style="background-color:gray;"> | |
<canvas id='canvas' width="800" height="600" style="border:1px solid red;"></canvas> | |
<!-- | |
</body> | |
</html> |
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