Uses d3.svg.area to create an arc that tapers at its ends. Developed for a data visualization design by Nicolette Hayes.
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Tapered Arc
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<style> | |
body { | |
font: 15px sans-serif; | |
line-height: 18px; | |
width: 600px; | |
margin: 20px auto; | |
} | |
.axis path, | |
.axis line { | |
fill: none; | |
stroke: #000; | |
shape-rendering: crispEdges; | |
} | |
.area { | |
fill: #555; | |
pointer-events: none; | |
} | |
circle { | |
fill: orange; | |
stroke: none; | |
opacity: 0.3; | |
} | |
circle:hover { | |
fill: orange; | |
stroke: orange; | |
stroke-width: 12; | |
opacity: 1; | |
} | |
</style> | |
<body> | |
<div style="margin-left: 100px"> | |
Tension <input id="tension" type="range" min=0 max=1 value=0.5 step=0.05 /> <span id="tension-val">0.5</span><br/> | |
Width <input id="width" type="range" min=1 max=60 value=24 step=1 /> <span id="width-val">24</span> px<br/> | |
Offset <input id="offset" type="range" min=-200 max=200 value=-50 step=1 /> <span id="offset-val">-50</span> px | |
<div> | |
<script src="http://d3js.org/d3.v3.js"></script> | |
<script> | |
var width = 600, | |
height = 400; | |
var parseDate = d3.time.format("%d-%b-%y").parse; | |
var area = d3.svg.area() | |
.x(function(d) { return d.x; }) | |
.x0(function(d) { return d.x0; }) | |
.y0(function(d) { return d.y0; }) | |
.y1(function(d) { return d.y1; }) | |
.interpolate("cardinal") | |
.tension(0.5); | |
var link = { | |
start: [100,200], | |
end: [500,200], | |
width: 24, | |
offset: -50 | |
}; | |
var svg = d3.select("body").append("svg") | |
.attr("width", width) | |
.attr("height", height) | |
var path = svg.append("path") | |
.datum(toArc(link)) | |
.attr("class", "area") | |
.attr("d", area); | |
svg.append("circle") | |
.attr("cx", link.start[0]) | |
.attr("cy", link.start[1]) | |
.attr("r", 3) | |
.call(d3.behavior.drag() | |
.on("drag", function() { | |
link.start = [d3.event.x, d3.event.y]; | |
d3.select(this) | |
.attr("cx", link.start[0]) | |
.attr("cy", link.start[1]); | |
path.datum(toArc(link)) | |
.attr("d", area); | |
}) | |
); | |
svg.append("circle") | |
.attr("cx", link.end[0]) | |
.attr("cy", link.end[1]) | |
.attr("r", 3) | |
.call(d3.behavior.drag() | |
.on("drag", function() { | |
link.end = [d3.event.x, d3.event.y]; | |
d3.select(this) | |
.attr("cx", link.end[0]) | |
.attr("cy", link.end[1]); | |
path.datum(toArc(link)) | |
.attr("d", area); | |
}) | |
); | |
d3.select("#tension") | |
.on("input", function() { | |
area.tension(+this.value) | |
d3.select("#tension-val").text(this.value); | |
path.attr("d", area); | |
}); | |
d3.select("#width") | |
.on("input", function() { | |
link.width = +this.value; | |
d3.select("#width-val").text(this.value); | |
path.datum(toArc(link)) | |
.attr("d", area); | |
}); | |
d3.select("#offset") | |
.on("input", function() { | |
link.offset = +this.value; | |
d3.select("#offset-val").text(this.value); | |
path.datum(toArc(link)) | |
.attr("d", area); | |
}); | |
function toArc(d) { | |
return [{ | |
x: d.start[0], | |
x0: d.start[0], | |
y0: d.start[1], | |
y1: d.start[1], | |
}, | |
{ | |
x: (d.start[0]+d.end[0])/2, | |
x0: (d.start[0]+d.end[0])/2, | |
y0: (d.start[1]+d.end[1])/2+d.offset+d.width/2, | |
y1: (d.start[1]+d.end[1])/2+d.offset-d.width/2, | |
} | |
, | |
{ | |
x: d.end[0], | |
x0: d.end[0], | |
y0: d.end[1], | |
y1: d.end[1], | |
}]; | |
}; | |
</script> |
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