Visitors to NZ National Parks

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		<meta charset="utf-8">
		<title>NZ National Parks</title>
		<script type="text/javascript" src="https://d3js.org/d3.v3.js"></script>
		<link href="natparks.css" rel="stylesheet" type="text/css"/>
	</head>
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<h1>National Park visitorship in the land of the long white cloud</h1>

<p>They have some superb National Parks over there. You should go sometime.</p>
		
		<div class="clear"></div>

//Dimensions and padding
			var w = 700;
			var h = 600;
			var padding = [ 20, 10, 50, 100 ];  //Top, right, bottom, left

//Set up date formatting and years
			var dateFormat = d3.time.format("%Y");

//Set up scales
			var xScale = d3.time.scale()
								.range([ padding[3], w - padding[1] - padding[3] ]);
			
			var yScale = d3.scale.linear()
								.range([ padding[0], h - padding[2] ]);

//Configure axis generators
			var xAxis = d3.svg.axis()
							.scale(xScale)
							.orient("bottom")
							.tickFormat(function(d) {
								return dateFormat(d);
							});

var yAxis = d3.svg.axis()
							.scale(yScale)
							.orient("left");

//Configure line generator
			var line = d3.svg.line()
				.x(function(d) {
					return xScale(dateFormat.parse(d.year));
				})
				.y(function(d) {
					return yScale(+d.amount);
				});

//Create the empty SVG image
			var svg = d3.select("body")
						.append("svg")
						.attr("width", w)
						.attr("height", h);

//Load data
			d3.csv("NZNationalParks.csv", function(data) {

//This was a really good way of making an array of years when I had the data in its original format. Unfortunately, I've now transposed it
				/*var years = [];

data.map(function(d) {
    				years.push(d.calendarYear);
				});*/

var years = d3.keys(data[0]).filter(function(head) {
					return head != "NP";
				});

//console.log(years);

//Create a new, empty array to hold our restructured dataset
				var dataset = [];

//Loop once for each row in data
				for (var i = 0; i < data.length; i++) {

//Create new object with this country's name and empty array
					dataset[i] = {
						park: data[i].NP,
						visitors: []
					};

//Loop through all the years
					for (var j = 0; j < years.length; j++) {

// If value is not empty
						if (data[i][years[j]]) {
							//Add a new object to the visitors data array
							//for this country
							dataset[i].visitors.push({
								year: years[j],
								amount: data[i][years[j]]
							});
						}

}

}
				
				//Uncomment to log the original data to the console
				 //console.log(data);

//Uncomment to log the newly restructured dataset to the console
				 //console.log(dataset);

//Set scale domains
				xScale.domain([ 
					d3.min(years, function(d) {
						return dateFormat.parse(d);
					}),
					d3.max(years, function(d) {
						return dateFormat.parse(d);
					})
				]);

yScale.domain([ 
					d3.max(dataset, function(d) {
						return d3.max(d.visitors, function(d) {
							return +d.amount;
						});
					}),
					0
				]);

//Make a group for each country
				var groups = svg.selectAll("g")
					.data(dataset)
					.enter()
					.append("g")
					.attr("class", (function(d) { return d.park; }));

//Append a title with the country name (so we get easy tooltips)
				groups.append("title")
					.text(function(d) {
						return d.park;
					});

//Within each group, create a new line/path,
				//binding just the visitors data to each one
				groups.selectAll("path")
					.data(function(d) {
						return [ d.visitors ];
					})
					.enter()
					.append("path")
					.attr("d", line);

//Label each line!
				groups.append("text")
					.attr("class", "label")
    				.attr("x", w - padding[3] - 4)
    				.attr("y", function(d, i) {

//Get the last value in the array
    					//(e.g., the right-most point on each line)
    					var lastValue = d.visitors[d.visitors.length - 1].amount;

//Position this label vertically, relative to that point
    					//…making exceptions for Paparoa and Tongariro, because 
    					//they share the same value

if (d.park == "Paparoa") {
							return yScale(lastValue) + 8;
    					} else if (d.park == "Tongariro") {
							return yScale(lastValue) - 5;
    					} else {
	    					return yScale(lastValue) + 2;
    					}

})
    				.text(function(d) {
    					console.log(d);
    					return d.park;
    				});

//Axes
				svg.append("g")
					.attr("class", "x axis")
					.attr("transform", "translate(0," + (h - padding[2]) + ")")
					.call(xAxis);

svg.append("g")
					.attr("class", "y axis")
					.attr("transform", "translate(" + (padding[3]) + ",0)")
					.call(yAxis);

//Legend
				// var legend = d3.select("#legend").append("svg")
				// 		.attr("width", 300)
				// 		.attr("height", 120);

// legend.selectAll("line")
    // 				.data(data)
    // 				.enter()
    // 				.append("line")
    // 				.attr("x1", 0)
    // 				.attr("x2", 20)
    // 				.attr("y1", function(d, i){return i * 20 + 5;})
    // 				.attr("y2", function(d, i){return i * 20 + 5;})
				// 	.attr("class", function(d){return d.NP;});

// legend.selectAll("text")
    // 				.data(data)
    // 				.enter()
    // 				.append("text")
    // 				.attr("x", 25)
    // 				.attr("y", function(d, i){return i * 20 + 8;})
    // 				.text(function(d){return d.NP;});

});

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		<div id="attribution"><p>Source: <a href="https://www.doc.govt.nz/about-us/our-role/managing-conservation/recreation-management/visitor-statistics-and-research/national-parks-visitor-statistics/">NZ Department of Conservation</a>, 2014</p></p></div>

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