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Raphael.js arrow function

View raphael-arrow.js
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Raphael.fn.arrow = function(x1, y1, x2, y2, size) {
var angle = Raphael.angle(x1, y1, x2, y2);
var a45 = Raphael.rad(angle-45);
var a45m = Raphael.rad(angle+45);
var a135 = Raphael.rad(angle-135);
var a135m = Raphael.rad(angle+135);
var x1a = x1 + Math.cos(a135) * size;
var y1a = y1 + Math.sin(a135) * size;
var x1b = x1 + Math.cos(a135m) * size;
var y1b = y1 + Math.sin(a135m) * size;
var x2a = x2 + Math.cos(a45) * size;
var y2a = y2 + Math.sin(a45) * size;
var x2b = x2 + Math.cos(a45m) * size;
var y2b = y2 + Math.sin(a45m) * size;
return this.path(
"M"+x1+" "+y1+"L"+x1a+" "+y1a+
"M"+x1+" "+y1+"L"+x1b+" "+y1b+
"M"+x1+" "+y1+"L"+x2+" "+y2+
"M"+x2+" "+y2+"L"+x2a+" "+y2a+
"M"+x2+" "+y2+"L"+x2b+" "+y2b
);
};
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