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learningcurve.html
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learningcurve.html
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<!DOCTYPE html>
<meta charset="utf-8">
<head><style>
body{margin:0px;}
svg {
//border: solid 1px #666;
overflow: hidden;
}
path {
fill: yellow;
stroke: #000;
stroke-width: .5px;
}
circle {
fill: #ccc;
stroke: #000;
pointer-events: none;
}
p {font: 48px "Sans Serif" ;margin-left:36px;}
</style></head>
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<div id="chart" style="width:1280px;height:620px"></div>
<p>Your d3 learning curve</hp>
<script>
var width = 1280,
height = 620;
var points=d3.range(0,1.01,.01);
var sigmoid =function(x) {return 1/(1+Math.exp(19.55-39.109*x));}
var x=d3.scale.linear().range([10,width-10]);
var y=d3.scale.linear().range([height-50,50]);
var sigmoidScaled = function(x) {return y(sigmoid((x+.25))+(50*x/width));}
var moveCircle;
var line = d3.svg.line()
.x(x).interpolate("basis")
.y(sigmoidScaled);
var svg = d3.select("#chart")
.append("svg")
.attr("width", width)
.attr("height", height)
svg.append("line").attr("x1",10).attr("x2",width-10).attr("y1",height-10).attr("y2",height-10).style("stroke","black").style("stroke-width",.25)
//svg.append("line").attr("x1",x(.5)).attr("x2",x(.5)).attr("y1",10).attr("y2",height-10).style("stroke","black").style("stroke-width",.25)
svg.selectAll("path").data([points])
.enter().append("path")
.style("fill","none").style("stroke-width",3)
.style("stroke","black")
.attr("d", line).on("mouseon",function() {moveCircle(d3.event.x);})
;
svg.selectAll(".l2").data([0.01]).enter().append("path")
.style("fill","none").style("stroke-width",4)
.style("stroke","gold").classed("l2",1)
.attr("d", line)
;
svg.selectAll("rect").data(points)
.enter().append("rect")
.style("fill","white").style("opacity",.01).style("stroke","none")
.attr("x",x).attr("width",x(.01))
.attr("y",y(1)).attr("height",y(0)-y(1))
.on("mouseover",function(d) {update(d);})
svg.append("circle").datum(.01).attr({cx:x,cy:sigmoidScaled,r:20}).style({fill:"white",stroke:"black"})
function update(d) {
d3.select("circle").datum(d).attr({cx:x,cy:sigmoidScaled})
d3.select(".l2").datum(d3.range(0,d+.01,.01)).attr("d", line)
}
</script>
</body>
</html>