davetaz · August 28, 2020 11:36
diff --git a/README.md b/README.md
diff --git a/index.html b/index.html
 <!DOCTYPE html>
 <meta charset="utf-8">
 <title>Zoomable Treemap</title>
 <link rel="stylesheet" type="text/css" href="style.css" />
 <script src="http://d3js.org/d3.v2.js"></script>
 <script src="http://code.jquery.com/jquery-1.7.1.js"></script>

 <p id="chart">
 <p id="rawdata">

 <script src="treemap.js"></script>
 <script>
 	function reSortRoot(root,value_key) {
 		//console.log("Calling");
 		for (var key in root) {
 			if (key == "key") {
 				root.name = root.key;
 				delete root.key;
 			}
 			if (key == "values") {
 				root.children = [];
 				for (item in root.values) {
 					root.children.push(reSortRoot(root.values[item],value_key));
 				}
 				delete root.values;
 			}
 			if (key == value_key) {
 				root.value = parseFloat(root[value_key]);
 				delete root[value_key];
 			}
 		}
 		return root;
 	}

 	$( document ).ready(function() {
 		// You can comment out the whole csv section if you just have a JSON file.
    // loadJSONFile('data/portaldata.json');

    	d3.csv("UK_Home_Office_Air_Travel_Data_2011.csv", function(csv_data){

 			// Add, remove or change the key values to change the hierarchy. 
      var nested_data = d3.nest()
       				.key(function(d)  { return d.Destination; })
       				.key(function(d)  { return d.Supplier_name; })
              .key(function(d)  { return d.Ticket_class_description; })
 				      .entries(csv_data);
 			
 			// Creat the root node for the treemap
 			var root = {};
 			
 			// Add the data to the tree
 			root.key = "Data";
 			root.values = nested_data;
 		
 			// Change the key names and children values from .next and add values for a chosen column to define the size of the blocks
 			root = reSortRoot(root,"Paid_fare");
 			
 			// DEBUG
 // 			$("#rawdata").html(JSON.stringify(root));
 			
 			loadData(root);
 			
 		});


 	});
 </script>
diff --git a/style.css b/style.css
 #chart {
 width: 820px;
 height: 700px;
 background: #bbb;
 margin: 1px auto;
 position: relative;
 	  -webkit-box-sizing: border-box;
 	  -moz-box-sizing: border-box;
 	  box-sizing: border-box;
 }

 text {
 	pointer-events: none;
 }

 .grandparent text { /* header text */
 	font-weight: bold;
 	font-size: medium;
 	font-family: "Open Sans", Helvetica, Arial, sans-serif; 
 }

 rect {
 fill: none;
 stroke: #fff;
 }

 rect.parent,
 	.grandparent rect {
 		stroke-width: 2px;
 	}

 .grandparent rect {
 fill: #fff;
 }

 .children rect.parent,
 	.grandparent rect {
 cursor: pointer;
 	}

 rect.parent {
 	pointer-events: all; 
 }

 .children:hover rect.child,
 	.grandparent:hover rect {
 fill: #aaa;
 	}

 .textdiv { /* text in the boxes */
 	font-size: x-small;
 padding: 5px;
 	 font-family: "Open Sans", Helvetica, Arial, sans-serif; 
 }
diff --git a/treemap.js b/treemap.js
 /* 
 * If running inside bl.ocks.org we want to resize the iframe to fit both graphs
 * This bit of code was shared originally at https://gist.github.com/benjchristensen/2657838
 */
 if(parent.document.getElementsByTagName("iframe")[0]) {
 	parent.document.getElementsByTagName("iframe")[0].setAttribute('style', 'height: 700px !important');
 }

 var margin = {top: 20, right: 0, bottom: 0, left: 0},
    width = 820,
    height = 700 - margin.top - margin.bottom,
    formatNumber = d3.format(".2s"),
    transitioning;

 /* create x and y scales */
 var x = d3.scale.linear()
 	.domain([0, width])
 	.range([0, width]);

 var y = d3.scale.linear()
 	.domain([0, height])
 	.range([0, height]);

 var treemap = d3.layout.treemap()
 	.children(function(d, depth) { return depth ? null : d.children; })
 	.sort(function(a, b) { return a.value - b.value; })
 	.ratio(height / width * 0.5 * (1 + Math.sqrt(5)))
 	.round(false);

 	/* create svg */
 var svg = d3.select("#chart").append("svg")
 	.attr("width", width + margin.left + margin.right)
 	.attr("height", height + margin.bottom + margin.top)
 	.style("margin-left", -margin.left + "px")
 	.style("margin.right", -margin.right + "px")
 	.append("g")
 	.attr("transform", "translate(" + margin.left + "," + margin.top + ")")
 	.style("shape-rendering", "crispEdges");

 var color = d3.scale.category20c();

 var grandparent = svg.append("g")
 	.attr("class", "grandparent");

 grandparent.append("rect")
 	.attr("y", -margin.top)
 	.attr("width", width)
 	.attr("height", margin.top);

 grandparent.append("text")
 	.attr("x", 6)
 	.attr("y", 6 - margin.top)
 	.attr("dy", ".75em");

 function initialize(root) {
 	root.x = root.y = 0;
 	root.dx = width;
 	root.dy = height;
 	root.depth = 0;
 }

 // Aggregate the values for internal nodes. This is normally done by the
 // treemap layout, but not here because of the custom implementation.
 function accumulate(d) {
 	return d.children
 	? d.value = d.children.reduce(function(p, v) { return p + accumulate(v); }, 0)
 	: d.value;
 }

 // Compute the treemap layout recursively such that each group of siblings
 // uses the same size (1×1) rather than the dimensions of the parent cell.
 // This optimizes the layout for the current zoom state. Note that a wrapper
 // object is created for the parent node for each group of siblings so that
 // the parent’s dimensions are not discarded as we recurse. Since each group
 // of sibling was laid out in 1×1, we must rescale to fit using absolute
 // coordinates. This lets us use a viewport to zoom.
 function layout(d) {
 	if (d.children) {
 		treemap.nodes({children: d.children});
 		d.children.forEach(function(c) {
 			c.x = d.x + c.x * d.dx;
 			c.y = d.y + c.y * d.dy;
 			c.dx *= d.dx;
 			c.dy *= d.dy;
 			c.parent = d;
 			layout(c);
 		});
 	}
 }

 /* display shows the treemap and writes the embedded transition function */
 function display(d) {
 /* create grandparent bar at top */
 	grandparent
 		.datum(d.parent)
 		.on("click", transition)
 		.select("text")
 		.text(name(d));

 	var g1 = svg.insert("g", ".grandparent")
 		.datum(d)
 		.attr("class", "depth");
 		/* add in data */
 	var g = g1.selectAll("g")
 		.data(d.children)
 		.enter().append("g");
 		/* transition on child click */
 	g.filter(function(d) { return d.children; })
 		.classed("children", true)
 		.on("click", transition);
 		/* write children rectangles */
 	g.selectAll(".child")
 		.data(function(d) { return d.children || [d]; })
 		.enter().append("rect")
 		.attr("class", "child")
 		.call(rect)
 		.append("title")
 		.text(function(d) { return d.name + " " + formatNumber(d.size); });

 	/* write parent rectangle */
 	g.append("rect")
 		.attr("class", "parent")
 		.call(rect)
 		/* open new window based on the json's URL value for leaf nodes */
 		/* Chrome displays this on top */
 		.on("click", function(d) { 
 			if(!d.children){
 				window.open(d.url); 
 			}
 		})
 		.append("title")
 		.text(function(d) { return d.name + " " + formatNumber(d.size); }); /*should be d.value*/

 	/* Adding a foreign object instead of a text object, allows for text wrapping */
 	g.append("foreignObject")
 		.call(rect)
 		/* open new window based on the json's URL value for leaf nodes */
 		/* Firefox displays this on top */
 		.on("click", function(d) { 
 			if(!d.children){
 				window.open(d.url); 
 			}
 		})
 		.attr("class","foreignobj")
 		.append("xhtml:div") 
 		.attr("dy", ".75em")
 		.html(function(d) { 
 			if (d.size) {
 				return d.name + " (" + formatNumber(d.size) + ")"; 
 			} 
 			if (d.value > 0 && typeof(d.value) !== "undefined") {
 				return d.name + " (" + formatNumber(d.value) + ")"; 
 			}
 			return d.name;
 		})
 		.attr("class","textdiv"); //textdiv class allows us to style the text easily with CSS
 			/* create transition function for transitions */
 	function transition(d) {
 		if (transitioning || !d) return;
 		transitioning = true;
 		var g2 = display(d),
 		    t1 = g1.transition().duration(750),
 		    t2 = g2.transition().duration(750);
 			// Update the domain only after entering new elements.
 		x.domain([d.x, d.x + d.dx]);
 		y.domain([d.y, d.y + d.dy]);
 			// Enable anti-aliasing during the transition.
 		svg.style("shape-rendering", null);

 		// Draw child nodes on top of parent nodes.
 		svg.selectAll(".depth").sort(function(a, b) { return a.depth - b.depth; });
 		// Fade-in entering text.
 		g2.selectAll("text").style("fill-opacity", 0);
 		g2.selectAll("foreignObject div").style("display", "none"); /*added*/

 		// Transition to the new view.
 		t1.selectAll("text").call(text).style("fill-opacity", 0);
 		t2.selectAll("text").call(text).style("fill-opacity", 1);
 		t1.selectAll("rect").call(rect);
 		t2.selectAll("rect").call(rect);

 		t1.selectAll(".textdiv").style("display", "none"); /* added */
 		t1.selectAll(".foreignobj").call(foreign); /* added */
 		t2.selectAll(".textdiv").style("display", "block"); /* added */
 		t2.selectAll(".foreignobj").call(foreign); /* added */ 

 		// Remove the old node when the transition is finished.
 		t1.remove().each("end", function() {
 			svg.style("shape-rendering", "crispEdges");
 			transitioning = false;
 		});

 	}//endfunc transition

 	return g;
 }//endfunc display

 function text(text) {
 	text.attr("x", function(d) { return x(d.x) + 6; })
 	    .attr("y", function(d) { return y(d.y) + 6; });
 }

 function rect(rect) {
 	rect.attr("x", function(d) { return x(d.x); })
 		.attr("y", function(d) { return y(d.y); })
 		.attr("width", function(d) { return x(d.x + d.dx) - x(d.x); })
 		.attr("height", function(d) { return y(d.y + d.dy) - y(d.y); })
 		.style("background", function(d) { return d.parent ? color(d.name) : null; });
 }

 function foreign(foreign){ /* added */
 	foreign.attr("x", function(d) { return x(d.x); })
 		.attr("y", function(d) { return y(d.y); })
 		.attr("width", function(d) { return x(d.x + d.dx) - x(d.x); })
 		.attr("height", function(d) { return y(d.y + d.dy) - y(d.y); });
 }

 function name(d) {
 	return d.parent ? name(d.parent) + "." + d.name : d.name;
 }

 function loadJSONFile(file) {
 	/* load in data, display root */
 	d3.json(file, function(root) {
 		loadData(root);
 	});
 }

 function loadData(root) {
 	initialize(root);
 	accumulate(root);
 	layout(root);
 	display(root);
 }
diff --git a/UK_Home_Office_Air_Travel_Data_2011.csv b/UK_Home_Office_Air_Travel_Data_2011.csv
	<!DOCTYPE html>
	<meta charset="utf-8">
	<title>Zoomable Treemap</title>
	<link rel="stylesheet" type="text/css" href="style.css" />
	<script src="http://d3js.org/d3.v2.js"></script>
	<script src="http://code.jquery.com/jquery-1.7.1.js"></script>

	<p id="chart">
	<p id="rawdata">

	<script src="treemap.js"></script>
	<script>
	function reSortRoot(root,value_key) {
	//console.log("Calling");
	for (var key in root) {
	if (key == "key") {
	root.name = root.key;
	delete root.key;
	}
	if (key == "values") {
	root.children = [];
	for (item in root.values) {
	root.children.push(reSortRoot(root.values[item],value_key));
	}
	delete root.values;
	}
	if (key == value_key) {
	root.value = parseFloat(root[value_key]);
	delete root[value_key];
	}
	}
	return root;
	}

	$( document ).ready(function() {
	// You can comment out the whole csv section if you just have a JSON file.
	// loadJSONFile('data/portaldata.json');

	d3.csv("UK_Home_Office_Air_Travel_Data_2011.csv", function(csv_data){

	// Add, remove or change the key values to change the hierarchy.
	var nested_data = d3.nest()
	.key(function(d) { return d.Destination; })
	.key(function(d) { return d.Supplier_name; })
	.key(function(d) { return d.Ticket_class_description; })
	.entries(csv_data);

	// Creat the root node for the treemap
	var root = {};

	// Add the data to the tree
	root.key = "Data";
	root.values = nested_data;

	// Change the key names and children values from .next and add values for a chosen column to define the size of the blocks
	root = reSortRoot(root,"Paid_fare");

	// DEBUG
	// $("#rawdata").html(JSON.stringify(root));

	loadData(root);

	});


	});
	</script>
	#chart {
	width: 820px;
	height: 700px;
	background: #bbb;
	margin: 1px auto;
	position: relative;
	-webkit-box-sizing: border-box;
	-moz-box-sizing: border-box;
	box-sizing: border-box;
	}

	text {
	pointer-events: none;
	}

	.grandparent text { /* header text */
	font-weight: bold;
	font-size: medium;
	font-family: "Open Sans", Helvetica, Arial, sans-serif;
	}

	rect {
	fill: none;
	stroke: #fff;
	}

	rect.parent,
	.grandparent rect {
	stroke-width: 2px;
	}

	.grandparent rect {
	fill: #fff;
	}

	.children rect.parent,
	.grandparent rect {
	cursor: pointer;
	}

	rect.parent {
	pointer-events: all;
	}

	.children:hover rect.child,
	.grandparent:hover rect {
	fill: #aaa;
	}

	.textdiv { /* text in the boxes */
	font-size: x-small;
	padding: 5px;
	font-family: "Open Sans", Helvetica, Arial, sans-serif;
	}
	/*
	* If running inside bl.ocks.org we want to resize the iframe to fit both graphs
	* This bit of code was shared originally at https://gist.github.com/benjchristensen/2657838
	*/
	if(parent.document.getElementsByTagName("iframe")[0]) {
	parent.document.getElementsByTagName("iframe")[0].setAttribute('style', 'height: 700px !important');
	}

	var margin = {top: 20, right: 0, bottom: 0, left: 0},
	width = 820,
	height = 700 - margin.top - margin.bottom,
	formatNumber = d3.format(".2s"),
	transitioning;

	/* create x and y scales */
	var x = d3.scale.linear()
	.domain([0, width])
	.range([0, width]);

	var y = d3.scale.linear()
	.domain([0, height])
	.range([0, height]);

	var treemap = d3.layout.treemap()
	.children(function(d, depth) { return depth ? null : d.children; })
	.sort(function(a, b) { return a.value - b.value; })
	.ratio(height / width * 0.5 * (1 + Math.sqrt(5)))
	.round(false);

	/* create svg */
	var svg = d3.select("#chart").append("svg")
	.attr("width", width + margin.left + margin.right)
	.attr("height", height + margin.bottom + margin.top)
	.style("margin-left", -margin.left + "px")
	.style("margin.right", -margin.right + "px")
	.append("g")
	.attr("transform", "translate(" + margin.left + "," + margin.top + ")")
	.style("shape-rendering", "crispEdges");

	var color = d3.scale.category20c();

	var grandparent = svg.append("g")
	.attr("class", "grandparent");

	grandparent.append("rect")
	.attr("y", -margin.top)
	.attr("width", width)
	.attr("height", margin.top);

	grandparent.append("text")
	.attr("x", 6)
	.attr("y", 6 - margin.top)
	.attr("dy", ".75em");

	function initialize(root) {
	root.x = root.y = 0;
	root.dx = width;
	root.dy = height;
	root.depth = 0;
	}

	// Aggregate the values for internal nodes. This is normally done by the
	// treemap layout, but not here because of the custom implementation.
	function accumulate(d) {
	return d.children
	? d.value = d.children.reduce(function(p, v) { return p + accumulate(v); }, 0)
	: d.value;
	}

	// Compute the treemap layout recursively such that each group of siblings
	// uses the same size (1×1) rather than the dimensions of the parent cell.
	// This optimizes the layout for the current zoom state. Note that a wrapper
	// object is created for the parent node for each group of siblings so that
	// the parent’s dimensions are not discarded as we recurse. Since each group
	// of sibling was laid out in 1×1, we must rescale to fit using absolute
	// coordinates. This lets us use a viewport to zoom.
	function layout(d) {
	if (d.children) {
	treemap.nodes({children: d.children});
	d.children.forEach(function(c) {
	c.x = d.x + c.x * d.dx;
	c.y = d.y + c.y * d.dy;
	c.dx *= d.dx;
	c.dy *= d.dy;
	c.parent = d;
	layout(c);
	});
	}
	}

	/* display shows the treemap and writes the embedded transition function */
	function display(d) {
	/* create grandparent bar at top */
	grandparent
	.datum(d.parent)
	.on("click", transition)
	.select("text")
	.text(name(d));

	var g1 = svg.insert("g", ".grandparent")
	.datum(d)
	.attr("class", "depth");
	/* add in data */
	var g = g1.selectAll("g")
	.data(d.children)
	.enter().append("g");
	/* transition on child click */
	g.filter(function(d) { return d.children; })
	.classed("children", true)
	.on("click", transition);
	/* write children rectangles */
	g.selectAll(".child")
	.data(function(d) { return d.children \|\| [d]; })
	.enter().append("rect")
	.attr("class", "child")
	.call(rect)
	.append("title")
	.text(function(d) { return d.name + " " + formatNumber(d.size); });

	/* write parent rectangle */
	g.append("rect")
	.attr("class", "parent")
	.call(rect)
	/* open new window based on the json's URL value for leaf nodes */
	/* Chrome displays this on top */
	.on("click", function(d) {
	if(!d.children){
	window.open(d.url);
	}
	})
	.append("title")
	.text(function(d) { return d.name + " " + formatNumber(d.size); }); /should be d.value/

	/* Adding a foreign object instead of a text object, allows for text wrapping */
	g.append("foreignObject")
	.call(rect)
	/* open new window based on the json's URL value for leaf nodes */
	/* Firefox displays this on top */
	.on("click", function(d) {
	if(!d.children){
	window.open(d.url);
	}
	})
	.attr("class","foreignobj")
	.append("xhtml:div")
	.attr("dy", ".75em")
	.html(function(d) {
	if (d.size) {
	return d.name + " (" + formatNumber(d.size) + ")";
	}
	if (d.value > 0 && typeof(d.value) !== "undefined") {
	return d.name + " (" + formatNumber(d.value) + ")";
	}
	return d.name;
	})
	.attr("class","textdiv"); //textdiv class allows us to style the text easily with CSS
	/* create transition function for transitions */
	function transition(d) {
	if (transitioning \|\| !d) return;
	transitioning = true;
	var g2 = display(d),
	t1 = g1.transition().duration(750),
	t2 = g2.transition().duration(750);
	// Update the domain only after entering new elements.
	x.domain([d.x, d.x + d.dx]);
	y.domain([d.y, d.y + d.dy]);
	// Enable anti-aliasing during the transition.
	svg.style("shape-rendering", null);

	// Draw child nodes on top of parent nodes.
	svg.selectAll(".depth").sort(function(a, b) { return a.depth - b.depth; });
	// Fade-in entering text.
	g2.selectAll("text").style("fill-opacity", 0);
	g2.selectAll("foreignObject div").style("display", "none"); /added/

	// Transition to the new view.
	t1.selectAll("text").call(text).style("fill-opacity", 0);
	t2.selectAll("text").call(text).style("fill-opacity", 1);
	t1.selectAll("rect").call(rect);
	t2.selectAll("rect").call(rect);

	t1.selectAll(".textdiv").style("display", "none"); /* added */
	t1.selectAll(".foreignobj").call(foreign); /* added */
	t2.selectAll(".textdiv").style("display", "block"); /* added */
	t2.selectAll(".foreignobj").call(foreign); /* added */

	// Remove the old node when the transition is finished.
	t1.remove().each("end", function() {
	svg.style("shape-rendering", "crispEdges");
	transitioning = false;
	});

	}//endfunc transition

	return g;
	}//endfunc display

	function text(text) {
	text.attr("x", function(d) { return x(d.x) + 6; })
	.attr("y", function(d) { return y(d.y) + 6; });
	}

	function rect(rect) {
	rect.attr("x", function(d) { return x(d.x); })
	.attr("y", function(d) { return y(d.y); })
	.attr("width", function(d) { return x(d.x + d.dx) - x(d.x); })
	.attr("height", function(d) { return y(d.y + d.dy) - y(d.y); })
	.style("background", function(d) { return d.parent ? color(d.name) : null; });
	}

	function foreign(foreign){ /* added */
	foreign.attr("x", function(d) { return x(d.x); })
	.attr("y", function(d) { return y(d.y); })
	.attr("width", function(d) { return x(d.x + d.dx) - x(d.x); })
	.attr("height", function(d) { return y(d.y + d.dy) - y(d.y); });
	}

	function name(d) {
	return d.parent ? name(d.parent) + "." + d.name : d.name;
	}

	function loadJSONFile(file) {
	/* load in data, display root */
	d3.json(file, function(root) {
	loadData(root);
	});
	}

	function loadData(root) {
	initialize(root);
	accumulate(root);
	layout(root);
	display(root);
	}