HW2&3_linechart

forked from benlcollins's block: HW2&3_linechart

<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<title>d3 multi-line chart</title>
	
	
	<style>
		.line {
			fill: none;
			stroke-width: 1px;
		}

.axis path {
			stroke: black;
			stroke-width: 1px;
			fill: none;
			shape-rendering: crispEdges;
		}

.tick line {
			stroke: black;
			stroke-width: 1px;
		}
	</style>
</head>

var svg = d3.select("body").append("svg")
			.attr("width",width + margin.left + margin.right)
			.attr("height",height + margin.top + margin.bottom)
		.append("g")
			.attr("transform", "translate(" + margin.left + "," + margin.top + ")");

// setup scales - the domain is specified inside of the function called when we load the data
	var xScale = d3.time.scale().range([0, width]);
	var yScale = d3.scale.linear().range([height, 0]);
	var color = d3.scale.category10();

// setup the axes
	var xAxis = d3.svg.axis().scale(xScale).orient("bottom");
	var yAxis = d3.svg.axis().scale(yScale).orient("left");

// create function to parse dates into date objects
	var parseDate = d3.time.format("%m").parse;
	var formatDate = d3.time.format("%m");
	var bisectDate = d3.bisector(function(d) { return d.Month; }).left;

// set the line attributes
	var line = d3.svg.line()
		.interpolate("basis")
		.x(function(d) { return xScale(d.Month); })
		.y(function(d) { return yScale(d.close); });

var focus = svg.append("g").style("display","none");

// import data and create chart
	d3.csv("Facebook_Category.csv", function(d) {
			return {
				Month: parseDate(d.Month),
				Category_1: +d.Category_1,
				Category_2: +d.Category_2,
				Category_3: +d.Category_3
			};
		}, 
		function(error,data) {
			
			// sort data ascending - needed to get correct bisector results
			data.sort(function(a,b) {
				return a.Month - b.Month;
			});

// color domain
			color.domain(d3.keys(data[0]).filter(function(key) { return key !== "Month"; }));

// create stocks array with object for each company containing all data
			var Consumer = color.domain().map(function(name) {
				return {
					name: name,
					values: data.map(function(d){
						return {Month: d.Month, close: d[name]};
					})
				};
			});

// add domain ranges to the x and y scales
			xScale.domain([
				d3.min(Consumer, function(c) { return d3.min(c.values, function(v) { return v.Month; }); }),
				d3.max(Consumer, function(c) { return d3.max(c.values, function(v) { return v.Month; }); })
			]);
			yScale.domain([
				0,
				// d3.min(Consumer, function(c) { return d3.min(c.values, function(v) { return v.close; }); }),
				d3.max(Consumer, function(c) { return d3.max(c.values, function(v) { return v.close; }); })
			]);

// add the x axis
			svg.append("g")
				.attr("class", "x axis")
				.attr("transform", "translate(0," + height + ")")
				.call(xAxis);

// add the y axis
			svg.append("g")
					.attr("class", "y axis")
					.call(yAxis)
				.append("text")
					.attr("transform","rotate(-90)")
					.attr("y",-80)
					.attr("dy",".71em")
					.style("text-anchor","end")
					.text("Lifetime Post Consumers");

// add circle at intersection
			focus.append("circle")
				.attr("class","y")
				.attr("fill","none")
				.attr("stroke","black")
				.style("opacity",0.5)
				.attr("r",8);

// add horizontal line at intersection
			focus.append("line")
				.attr("class","x")
				.attr("stroke","black")
				.attr("stroke-dasharray","3,3")
				.style("opacity",0.5)
				.attr("x1", 0)
				.attr("x2", width);

// add vertical line at intersection
			focus.append("line")
				.attr("class","y")
				.attr("stroke","black")
				.attr("stroke-dasharray","3,3")
				.style("opacity",0.5)
				.attr("y1", 0)
				.attr("y2", height);

// append rectangle for capturing if mouse moves within area
			svg.append("rect")
				.attr("width",width)
				.attr("height",height)
				.style("fill","none")
				.style("pointer-events","all")
				.on("mouseover", function() { focus.style("display", null); })
				.on("mouseout", function() { focus.style("display", "none"); })
				.on("mousemove", mousemove);
			
			// add the line groups
			var Consumers = svg.selectAll(".ConsumersXYZ")
					.data(Consumer)
				.enter().append("g")
					.attr("class","ConsumersXYZ");

// add the stock price paths
			Consumers.append("path")
				.attr("class","line")
				.attr("id",function(d,i){ return "id" + i; })
				.attr("d", function(d) {
					return line(d.values); 
				})
				.style("stroke", function(d) { return color(d.name); });

// add the stock labels at the right edge of chart
			var maxLen = data.length;
			Consumers.append("text")
				.datum(function(d) { 
					return {name: d.name, value: d.values[maxLen - 1]}; 
				})
				.attr("transform", function(d) { 
					return "translate(" + xScale(d.value.Month) + "," + yScale(d.value.close) + ")"; 
				})
				.attr("id",function(d,i){ return "text_id" + i; })
		    .attr("x", 3)
		    .attr("dy", ".35em")
		    .text(function(d) { return d.name; })
		    .on("mouseover",function(d,i) { 
		    	for (j=0; j < 6; j++) {
						if (i !== j) {
							d3.select("#id"+j).style("opacity",0.1);
							d3.select("#text_id"+j).style("opacity",0.2);
						}
					};
		    })
		    .on("mouseout", function(d,i) {
		    	for (j=0; j < 6; j++) {
						d3.select("#id"+j).style("opacity",1);
						d3.select("#text_id"+j).style("opacity",1);
					};
		    });

// mousemove function
			function mousemove() {

var x0 = xScale.invert(d3.mouse(this)[0]);
				var i = bisectDate(data, x0, 1); // gives index of element which has date higher than x0
				var d0 = data[i - 1], d1 = data[i];
				var d = x0 - d0.Month > d1.Month - x0 ? d1 : d0;
				var close = d3.max([+d.Category_1,+d.Category_2,+d.Category_3]);

focus.select("circle.y")
				.attr("transform", "translate(" + xScale(d.Month) + "," + yScale(close) + ")");

focus.select("line.y")
					.attr("y2",height - yScale(close))
					.attr("transform", "translate(" + xScale(d.Month) + "," 
						+ yScale(close) + ")");

focus.select("line.x")
				.attr("x2",xScale(d.Month))
				.attr("transform", "translate(0," 
					+ (yScale(close)) + ")");

};

});

</script>

</body>
</html>

https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js