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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>绘制箭头测试</title>
<script src="7_5/jquery.min.js" ></script>
<script src="7_5/jquery-ui.min.js" ></script>
<script src="7_5/raphael.js" ></script>
<script>
var paper;
$(function()
{
paper = Raphael("paper",500,500);
var path = paper.path("M 50 60 80 130");
var path_arrow = paper.path(drawArrow(path.id));//生成的每一块图形都拥有唯一标示的id
//另外一个API自带的线的arrow-end属性在多数情况下试用
//效果等同于生成path_arrow 示例： path.attr({'arrow-end':'classic-wide-long'})
})
/*
* 自己绘制线段箭头
*/
function drawArrow(line_id)
{
var size = 5;
//analysis line
var line = paper.getById(line_id);
//get last points
var length = line.attrs.path.length;
var x1 = line.attrs.path[length-1][1];//单线段起点
var y1 = line.attrs.path[length-1][2];//单线段起点
var x2 = line.attrs.path[length-2][1];//单线段终点
var y2 = line.attrs.path[length-2][2];//单线段终点
//get last angle
var angle = Raphael.angle(x1, y1, x2, y2);//API方法获取角度，原直线倾斜度
var angle_45_one = Raphael.rad(angle - 45);//API方法转变为弧度
var angle_45_two = Raphael.rad(angle + 45);//API方法转变为弧度
//arrow points求出箭头的双向点
var angle_x1 = x1 - Math.cos(angle_45_one) * size;
var angle_y1 = y1 - Math.sin(angle_45_one) * size;
var angle_x2 = x1 - Math.cos(angle_45_two) * size;
var angle_y2 = y1 - Math.sin(angle_45_two) * size;
//return
var result = ["M",angle_x1,angle_y1, "L", x1,y1,"L",angle_x2, angle_y2];
return result;
}
</script>
</head>
<body>
<div id="paper">.
</div>
</body>
</html>
</span>