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PROJECT_1.0
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license: mit |
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<!DOCTYPE html> //class04 | |
<meta charset="utf-8"> | |
<title>Class 4</title> | |
<style> | |
body { | |
position: absolute; | |
margin: 0px; | |
} | |
svg { | |
background-color: #4682b4; | |
} | |
.info { | |
font-family: sans-serif; | |
color: #000; | |
position: absolute; | |
top: 450px; | |
left: 800px; | |
} | |
path { | |
fill: #555555; | |
stroke: #aaaaaa; | |
} | |
/* NEW: style the earthquakes */ | |
//path.quake { | |
// fill: crimson; | |
} | |
</style> | |
<script src="https://d3js.org/d3.v4.min.js"></script> | |
<script src="https://d3js.org/topojson.v2.min.js"></script> | |
<body> | |
<script> | |
var width = 960, height = 500; | |
var data; // declare a global variable | |
var svg = d3.select("body").append("svg") | |
.attr("width", width) | |
.attr("height", height) | |
.on("mousemove", mousemoved); | |
// NEW: Add one layer (i.e., <g> element) each for states & plot | |
var layer1 = svg.append("g"); | |
var layer2 = svg.append("g"); | |
var projection = d3.geoAlbersUsa(); | |
var path = d3.geoPath() | |
.projection(projection); | |
// Topojson for US states | |
var url = "https://umbcvis.github.io/classes/class-03/us.json" | |
var smoke = "https://raw.githubusercontent.com/li01012/classes/master/Project/Youth_Tobacco_Survey__YTS__Data.csv" | |
d3.json(url, plotStates); | |
d3.request(smoke) | |
.mimeType("text/csv") | |
.response(function(xhr) { return d3.csvParse(xhr.responseText, row); }); | |
function plotStates(error, json) { | |
// Convert topojson to an Array of GeoJSON features | |
// This defines "data", a global variable that can be manipulated in the developer console | |
data = json.objects.us.geometries.map(function(d) { return topojson.feature(json, d); }) | |
// Plot the features (states) -- one <path> element for each state | |
// NEW: Plot the states in a <g> element | |
layer1.selectAll("path") | |
.data(data) | |
.enter() | |
.append("path") | |
.attr("d", path); | |
} | |
function mousemoved() { | |
info.text(formatLocation(projection.invert(d3.mouse(this)), projection.scale())); | |
} | |
function formatLocation(p, k) { | |
var format = d3.format("." + Math.floor(Math.log(k) / 2 - 2) + "f"); | |
return (p[1] < 0 ? format(-p[1]) + "°S" : format(p[1]) + "°N") + " " | |
+ (p[0] < 0 ? format(-p[0]) + "°W" : format(p[0]) + "°E"); | |
} | |
</script> |
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