states.js

/*  This visualization was made possible by modifying code provided by:

Scott Murray, Choropleth example from "Interactive Data Visualization for the Web" 
https://github.com/alignedleft/d3-book/blob/master/chapter_12/05_choropleth.html   
		
Malcolm Maclean, tooltips example tutorial
http://www.d3noob.org/2013/01/adding-tooltips-to-d3js-graph.html

Mike Bostock, Pie Chart Legend
http://bl.ocks.org/mbostock/3888852  */

		
//Width and height of map
var width = 960;
var height = 500;

// D3 Projection
var projection = d3.geoAlbersUsa()
				   .translate([width/2, height/2])    // translate to center of screen
				   .scale([1000]);          // scale things down so see entire US
        
// Define path generator
var path = d3.geoPath()               // path generator that will convert GeoJSON to SVG paths
		  	 .projection(projection);  // tell path generator to use albersUsa projection

		
// Define linear scale for output
var color = d3.scaleLinear()
			  .range(["rgb(213,222,217)","rgb(69,173,168)","rgb(84,36,55)","rgb(217,91,67)"]);

var legendText = ["Cities Lived", "States Lived", "States Visited", "Nada"];

//Create SVG element and append map to the SVG
var svg = d3.select("body").append("svg")
	.attr("class","map")
	.attr("width", width)
	.attr("height", height);
      
// Append Div for tooltip to SVG
var div = d3.select("body").append("div")
	.attr("class", "tooltip")
	.style("opacity", 0);

// Load in my states data!
d3.tsv("StatesLived.tsv", stateType,function(data) {
	color.domain([0,1,2,3]); // setting the range of the input data

	// Load GeoJSON data and merge with states data
	d3.json("US-States.json", function(json) {

	// Loop through each state data value in the .tsv file
	for (var i = 0; i < data.length; i++) {

		// Grab State Name
		var dataState = data[i].State;

		// Grab data value 
		var dataValue = data[i].Visited;

		// Find the corresponding state inside the GeoJSON
		for (var j = 0; j < json.features.length; j++)  {
			var jsonState = json.features[j].properties.name;

			if (dataState == jsonState) {

			// Copy the data value into the JSON
			json.features[j].properties.Visited = dataValue; 

			// Stop looking through the JSON
			break;
			}
		}
	}
		
	// Bind the data to the SVG and create one path per GeoJSON feature
	svg.selectAll("path")
		.data(json.features)
		.enter()
		.append("path")
		.attr("d", path)
		//.style("stroke", "#fff")
		.style("stroke-width", "1");
		/*.style("fill", function(d) {
			// Get data value
			var value = d.properties.Visited;

			if (value) {
				//If value exists…
				return color(value);
			} 
			else {
				//If value is undefined…
				return "rgb(213,222,217)";
			}
		});*/

			 
	// Map the cities I have lived in!
	d3.tsv("CitiesLived.tsv", cityType, function(data) {

		svg.selectAll("circle")
			.data(data)
			.enter()
			.append("circle")
			.attr("cx", function(d) {
				return projection([d.Longitude, d.Latitude])[0];
			})
			.attr("cy", function(d) {
				return projection([d.Longitude, d.Latitude])[1];
			})
			.attr("r", function(d) {
				return Math.sqrt(d.YearsLived) * 4;
			})
				.style("fill", "rgb(217,91,67)")	
				.style("opacity", 0.85)	

			// Modification of custom tooltip code provided by Malcolm Maclean, "D3 Tips and Tricks" 
			// http://www.d3noob.org/2013/01/adding-tooltips-to-d3js-graph.html
			.on("mouseover", function(d) {
				div.transition()
					.duration(200)
					.style("opacity", .9);
				div.text(d.place)
					.style("left", (d3.event.pageX) + "px")     
					.style("top", (d3.event.pageY - 28) + "px");    
			})   

			// fade out tooltip on mouse out               
			.on("mouseout", function(d) {       
				div.transition()        
				   .duration(500)      
				   .style("opacity", 0);   
			});
	});  
			
	// Modified Legend Code from Mike Bostock: http://bl.ocks.org/mbostock/3888852
	var legend = d3.select("body").append("svg")
			.attr("class", "legend")
			.attr("width", 140)
			.attr("height", 200)
			.selectAll("g")
			.data(color.domain().slice().reverse())
			.enter()
			.append("g")
			.attr("transform", function(d, i) { return "translate(0," + i * 20 + ")"; });

		legend.append("rect")
			.attr("width", 18)
			.attr("height", 18)
			.style("fill", color);

		legend.append("text")
			.data(legendText)
			.attr("x", 24)
			.attr("y", 9)
			.attr("dy", ".35em")
			.text(function(d) { return d; });
		});

});

function cityType(type) {
	d = new Object();
	
	d.State = type["State"];
	d.YearsLived = type["Years Lived"];
	d.Latitude = type["Latitude"];
	d.Longitude = type["Longitude"];
	
	return d;
}

function stateType(type) {
	d = new Object();
	
	d.State = type["State"];
	d.Status = type["Status"];
	if (type["Status"]="Visited") {
		d.Visited=1;
	}
	else {
		d.Visited=0;
	}
	
	return d;
}