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JavaScript鼠标画线

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">  
<html xmlns="http://www.w3.org/1999/xhtml">  

<head>  
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />  
<title>Untitled 1</title>  
<style type="text/css">  
.style1 {  
    font-size: x-small;  
}  
</style> 
<script type="text/javascript">  
/**
	画点
*/	
function makedot(x, y){ 
  pointDiv = "<div style='height:1px;position:absolute;left:" + x +
  	"px;top:" + y + "px;width:1px;background:#f00;overflow:hidden'></div>"; 
  return pointDiv;
} 
/**  
  根据两点坐标画直线。  
*/  

function line(x1,y1,x2,y2){  
  var slope; //斜率
  var direction;//坐标运动方向
  var tx = x2 - x1;
  var ty = y2 - y1;
  if(tx == 0 && ty == 0)return;
  var points = "";
  var axis;//坐标轴上的坐标
  if(Math.abs(tx) >= Math.abs(ty)){//在x轴上移动
  	direction = tx > 0 ? 1 : -1;
  	tx = Math.abs(tx);
  	slope = ty / tx;
  	axis = x1;
  	for(i = 0; i < tx; i ++){
  		points += makedot(axis, y1 + i * slope);
  		axis += direction;
  	}
  	  
  }else{//在y轴上移动
  	direction = ty > 0 ? 1 : -1;
  	ty = Math.abs(ty);
  	slope = tx / ty;  
  	axis = y1;	
  	for(i = 0; i < ty; i ++){
  		points += makedot(x1 + i * slope, axis);
  		axis += direction;
  	}
  }
  var container = document.getElementById("container");
  container.innerHTML += points; 
} 
var oldPoint = null;
//获取鼠标位置
function mousePosition(ev){
	ev = ev || window.event;
	if(ev.pageX || ev.pageY){
		return {x:ev.pageX, y:ev.pageY};
	}
	var doc = document.documentElement, body = document.body;
	var pageX = event.clientX + (doc && doc.scrollLeft || body && body.scrollLeft || 0) - (doc && doc.clientLeft || body && body.clientLeft || 0);
	var pageY = event.clientY + (doc && doc.scrollTop  || body && body.scrollTop  || 0) - (doc && doc.clientTop  || body && body.clientTop  || 0);        
	return {x:pageX, y:pageY};
}

function recordPoint(ev){
	
	var point = mousePosition(ev);
	if(oldPoint != null){
		line(oldPoint.x, oldPoint.y, point.x, point.y);
	}
	oldPoint = point;
}


</script>
</head>  

<body>  
<div id="container" style="width: 1000px; height: 600px; border:1px #bfbfbf solid;" onclick="recordPoint(event);">
	
</div>
<script type="text/javascript"> 
	//line(19,19,22,300); 
</script>
</body>  

</html>
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