78 lines
1.6 KiB
HTML
78 lines
1.6 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3c.org/1999/xhtml">
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<head>
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<title>Circles in boxes</title>
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<style type='text/css'>
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* {
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margin:0;
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padding:0;
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}
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canvas {
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position:absolute;
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top:50%;
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left:50%;
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margin-top:-200px;
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margin-left:-320px;
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border:1px solid #000;
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}
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</style>
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<script type='text/javascript'>
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function getwh() {
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if (self.innerHeight) {
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h=self.innerHeight
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w=self.innerWidth
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}
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else if (document.documentElement && document.documentElement.clientHeight) {
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h=document.documentElement.clientHeight
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w=document.documentElement.clientHeight
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}
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else if (document.body) {
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h=document.body.clientHeight
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w=document.body.clientWidth
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}
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}
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function mm(e) {
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getwh()
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x=Math.floor(e.pageX-(w-642)/2-2)
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y=Math.floor(e.pageY-(h-402)/2-2)
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if (x<0) x=0
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if (x>639) x=639
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if (y<0) y=0
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if (y>399) y=399
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x=(x-320)*(-1)+160
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if (x>320) x=320
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if (x<160) lx=160
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else lx=x
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if (x<0) x=0
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if (x>160) rx=150
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else rx=x*(-1)+310
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lw=x-10
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if (lw<150) lw=150
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rw=310-x
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if (rw<150) rw=150
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lh=lw*390/310
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rh=rw*390/310
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var ctx=document.getElementById('canvas').getContext('2d')
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ctx.lineWidth=2
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ctx.clearRect(0,0,640,400)
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ctx.strokeRect(320-lx+5,(390-lh)/2+5,lx-10,lh)
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ctx.strokeRect(325,(390-rh)/2+5,rx,rh)
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ctx.beginPath()
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ctx.arc(lw/2-lx+325,lh/2+(390-lh)/2+5,lw/4,0,Math.PI*2,true)
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ctx.stroke()
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ctx.beginPath()
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ctx.arc(rw/2+rw-rx+325,rh/2+(390-rh)/2+5,rw/4,0,Math.PI*2,true)
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ctx.stroke()
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}
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document.onmousemove=mm
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</script>
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</head>
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<body>
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<canvas id='canvas' width='640' height='400'></canvas>
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</body>
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</html>
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