Example #1 from learning the Force Layout in d3. The charge is too strong in this example. The big red outlier gets buried inside the mass of bubbles. Not what I wanted. However, I like the tight curve of the entire pack of bubbles.
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October 26, 2015 02:07
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Force layout #1
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<html> | |
<head> | |
<script src="http://d3js.org/d3.v3.js"></script> | |
</head> | |
<body> | |
<script> | |
var w = 960, | |
h = 960, | |
padding = 30, // svg boundry padding | |
format = d3.format(".2%"), | |
maxRadius = 20; | |
// pull in csv data | |
d3.csv("/d/283008a26997e97e0490/Student_Weight_Status_Category_Reporting_Results__Beginning_2010.csv", function(error, rows) { | |
var dataset = [], counter = 0; | |
rows.forEach(function(entry){ | |
if ((entry["GRADE LEVEL"] == "DISTRICT TOTAL") && (entry["PCT OVERWEIGHT OR OBESE"] != "")) { | |
var pctOverObese = /[\d]+\.[\d]/.exec(entry["PCT OVERWEIGHT OR OBESE"]); | |
if (pctOverObese != null) { | |
pctOverObese = pctOverObese[0] / 100; // form percent mathematically | |
entry["pctOverObese"] = pctOverObese; | |
entry["pos"] = counter; | |
counter += 1; | |
dataset.push(entry); | |
} | |
} | |
}); | |
// desired data is loaded. form scales based on it. | |
var xScale = d3.scale.linear() | |
.domain([0, dataset.length]) | |
.range([w/4, (3*w)/4]); | |
var yScale = d3.scale.linear() | |
.domain([0, d3.max(dataset, function(d){ return d["pctOverObese"]; })]) | |
.range([h - padding, padding]); | |
var rScale = d3.scale.linear() | |
.domain([0, d3.max(dataset, function(d){ return d["pctOverObese"]; })]) | |
.range([2, 20]); | |
var colorScale = d3.scale.quantize() | |
.domain([0, d3.max(dataset, function(d){ return d["pctOverObese"]; })]) | |
.range(["#006837", "#1a9850", "#66bd63", "#fdae61", | |
"#f46d43", "#d73027", "#a50026"]); | |
// set node positions | |
dataset.forEach(function(node){ | |
node["x"] = xScale(node["pos"]); | |
node["y"] = yScale(node["pctOverObese"]); | |
}); | |
// set up force layout | |
var force = d3.layout.force() | |
.nodes(dataset) | |
.size([w, h]) | |
.gravity(.2) | |
.charge(-30) | |
.on("tick", tick) // ticks? | |
.start(); | |
// append the svg | |
var svg = d3.select("body") | |
.append("svg") | |
.attr("width", w) | |
.attr("height", h); | |
// create and draw nodes | |
var node = svg.selectAll("circle") | |
.data(dataset) | |
.enter() | |
.append("circle") | |
.attr("r", 0) // so the tween doesn't freak out | |
.style("fill", function(d) { return colorScale(d["pctOverObese"]); }) | |
.style("stroke", "rgba(255,255,255,.5)") | |
.call(force.drag); // ? | |
node.transition() | |
.duration(750) | |
.delay(function(d, i) { return i * 2; }) // doesn't seem to do anything | |
.attrTween("r", function(d) { | |
var i = d3.interpolate(0, rScale(d["pctOverObese"])); | |
return function(t) { return d["r"] = i(t); }; | |
}); | |
function tick(e) { | |
node | |
.each(collide(.5)) | |
.attr("cx", function(d){ return d["x"]; }) | |
.attr("cy", function(d){ return d["y"]; }) | |
.append("title") | |
.text(function(d) { | |
//return d["AREA NAME"] + ": " + format(d["pctOverObese"]); | |
return d["x"] + "," + d["y"]; | |
}); | |
} | |
function collide(alpha) { | |
var quadtree = d3.geom.quadtree(dataset); | |
return function(d) { | |
var r = d["r"] + maxRadius, | |
nx1 = d["x"] - r, | |
nx2 = d["x"] + r, | |
ny1 = d["y"] - r, | |
ny2 = d["y"] + r; | |
quadtree.visit(function(quad, x1, y1, x2, y2) { | |
if (quad.point && (quad.point !== d)) { | |
var x = d["x"] - quad.point.x, | |
y = d["y"] - quad.point.y, | |
l = Math.sqrt(x * x + y * y), | |
r = d["r"] + quad.point.radius; | |
if (l < r) { | |
l = (l - r) / l * alpha; | |
d["x"] -= x *= l; | |
d["y"] -= y *= l; | |
quad.point.x += x; | |
quad.point.y += y; | |
} | |
} | |
return x1 > nx2 || x2 < nx1 || y1 > ny2 || y2 < ny1; | |
}); | |
}; | |
} | |
}); // end of d3.csv | |
d3.select(self.frameElement).style("height", h + "px"); | |
</script> | |
</body> | |
</html> |
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