Example #2 from learning the d3 Force Layout. I loosed the charge from Force Layout #1, but I still don't think the outlier bubbles are sufficiently separate from the pack here.
Last active
October 26, 2015 02:10
-
-
Save dhoboy/f3c154f3b949e68ecfd5 to your computer and use it in GitHub Desktop.
Force layout #2
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <html> | |
| <head> | |
| <script src="http://d3js.org/d3.v3.js"></script> | |
| </head> | |
| <body> | |
| <script> | |
| var w = 960, | |
| h = 960, | |
| padding = 3, // svg boundry padding... seems to be pointless | |
| 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(.02) // setting gravity too high was throwing my outliers back into the middle of the screen, which I did not want | |
| .charge(-3) | |
| .on("tick", tick) | |
| .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)"); | |
| node.transition() | |
| .duration(750) | |
| .delay(function(d, i) { return i * 2; }) // doesn't seem to matter what the delay is | |
| .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)) // the collide parameter remains a mystery to me | |
| .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; | |
| }); | |
| }; | |
| } | |
| }); | |
| d3.select(self.frameElement).style("height", h + "px"); | |
| </script> | |
| </body> | |
| </html> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment