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Generate Path for Curly Bracket
<html>
<title>Curly Bracket</title>
<script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script>
<style>
.curlyBrace {
stroke: #000000;
stroke-width: 10px;
fill: none;
}
body {
font-family: Arial, Helvetica, sans-serif;
text-align: center;
}
</style>
<body ontouchmove="BlockMove(event);">
<p> Click and Drag to draw a bracket </p>
<script type="text/javascript">
//returns path string d for <path d="This string">
//a curly brace between x1,y1 and x2,y2, w pixels wide
//and q factor, .5 is normal, higher q = more expressive bracket
function makeCurlyBrace(x1,y1,x2,y2,w,q)
{
//Calculate unit vector
var dx = x1-x2;
var dy = y1-y2;
var len = Math.sqrt(dx*dx + dy*dy);
dx = dx / len;
dy = dy / len;
//Calculate Control Points of path,
var qx1 = x1 + q*w*dy;
var qy1 = y1 - q*w*dx;
var qx2 = (x1 - .25*len*dx) + (1-q)*w*dy;
var qy2 = (y1 - .25*len*dy) - (1-q)*w*dx;
var tx1 = (x1 - .5*len*dx) + w*dy;
var ty1 = (y1 - .5*len*dy) - w*dx;
var qx3 = x2 + q*w*dy;
var qy3 = y2 - q*w*dx;
var qx4 = (x1 - .75*len*dx) + (1-q)*w*dy;
var qy4 = (y1 - .75*len*dy) - (1-q)*w*dx;
return ( "M " + x1 + " " + y1 +
" Q " + qx1 + " " + qy1 + " " + qx2 + " " + qy2 +
" T " + tx1 + " " + ty1 +
" M " + x2 + " " + y2 +
" Q " + qx3 + " " + qy3 + " " + qx4 + " " + qy4 +
" T " + tx1 + " " + ty1 );
}
function update()
{
var bracket = d3.select("svg").selectAll("path").attr("class","curlyBrace").data(coords);
bracket.enter().append("path").attr("class","curlyBrace");
bracket.attr("d", function(d) { return makeCurlyBrace(d.x1,d.y1,d.x2,d.y2,50,0.6); });
bracket.exit().remove();
coords.shift();
}
var width = 962;
var height = 502;
var coords = [];
var clickPos = {};
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height)
.on("mousedown",function(){
clickPos = {"x1" : d3.mouse(this)[0], "y1": d3.mouse(this)[1]};
})
.on("mouseup", function(){
coords.push({"x1":clickPos.x1,"y1":clickPos.y1,"x2":d3.mouse(this)[0],"y2":d3.mouse(this)[1]});
update();
});
</script>
</body>
</html>
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