Nature-in-code/coevolution.html at master · vivekkrishna/Nature-in-code · GitHub

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<!DOCTYPE html>
<html>
	<head>
		<script src="https://d3js.org/d3.v4.min.js" charset="utf-8"></script>

	</head>
	<body>
		<script>

		function draw_line_chart(data,x_label,y_label,legend_values,x_max,y_max_flex) {
				var margin = {top: 20, right: 20, bottom: 50, left: 50},
					width = 700 - margin.left - margin.right,
					height = 400 - margin.top - margin.bottom;

				var version = d3.scale ? 3 : 4;
				var color = (version == 3 ? d3.scale.category10() : d3.scaleOrdinal(d3.schemeCategory10));

				if (!x_max) {
					x_max = data[0].length > 0 ? data[0].length : data.length
				}

				var y_max = data[0].length > 0 ? d3.max(data, function(array) {
						return d3.max(array);
					}) : d3.max(data);

				var x = (version == 3 ? d3.scale.linear() : d3.scaleLinear())
					.domain([0,x_max])
					.range([0, width]);

				var y = y_max_flex ? (version == 3 ? d3.scale.linear() : d3.scaleLinear())
					.domain([0, 1.1 * y_max])
					.range([height, 0]) : (version == 3 ? d3.scale.linear() : d3.scaleLinear())
					.range([height, 0]);

				var xAxis = (version == 3 ? d3.svg.axis().scale(x).orient("bottom") :
					d3.axisBottom().scale(x));

				var yAxis = (version == 3 ? d3.svg.axis().scale(y).orient("left") :
					d3.axisLeft().scale(y));

				var line = (version == 3 ? d3.svg.line() : d3.line())
					.x(function (d, i) {
						var dat = (data[0].length > 0 ? data[0] : data);
						return x((i/(dat.length-1)) * x_max);
					})
					.y(function (d) {
						return y(d);
					});

				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 + ")");

				svg.append("g")
					.attr("class", "x axis")
					.attr("transform", "translate(0," + height + ")")
					.call(xAxis)
					.append("text")
					.style("text-anchor", "middle")
					.attr("x", width / 2)
					.attr("y", 6)
					.attr("dy", "3em")
					.style("fill", "#000")
					.text(x_label);

				svg.append("g")
					.attr("class", "y axis")
					.call(yAxis)
					.append("text")
					.attr("transform", "rotate(-90)")
					.attr("x", -height / 2)
					.attr("dy", "-3.5em")
					.style("text-anchor", "middle")
					.style("fill", "#000")
					.text(y_label);

				if (legend_values.length > 0) {
					var legend = svg.append("text")
						.attr("text-anchor", "star")
						.attr("y", 30)
						.attr("x", width-100)
						.append("tspan").attr("class", "legend_title")
						.text(legend_values[0])
						.append("tspan").attr("class", "legend_text")
						.attr("x", width-100).attr("dy", 20).text(legend_values[1])
						.append("tspan").attr("class", "legend_title")
						.attr("x", width-100).attr("dy", 20).text(legend_values[2])
						.append("tspan").attr("class", "legend_text")
						.attr("x", width-100).attr("dy", 20).text(legend_values[3]);
				}
				else {
					svg.selectAll("line.horizontalGridY")
						.data(y.ticks(10)).enter()
						.append("line")
						.attr("x1", 1)
						.attr("x2", width)
						.attr("y1", function(d){ return y(d);})
						.attr("y2", function(d){ return y(d);})
						.style("fill", "none")
						.style("shape-rendering", "crispEdges")
						.style("stroke", "#f5f5f5")
						.style("stroke-width", "1px");

					svg.selectAll("line.horizontalGridX")
						.data(x.ticks(10)).enter()
						.append("line")
						.attr("x1", function(d,i){ return x(d);})
						.attr("x2", function(d,i){ return x(d);})
						.attr("y1", 1)
						.attr("y2", height)
						.style("fill", "none")
						.style("shape-rendering", "crispEdges")
						.style("stroke", "#f5f5f5")
						.style("stroke-width", "1px");
				}

				d3.select("body").style("font","10px sans-serif");
				d3.selectAll(".axis line").style("stroke","#000");
				d3.selectAll(".y.axis path").style("display","none");
				d3.selectAll(".x.axis path").style("display","none");
				d3.selectAll(".legend_title")
					.style("font-size","12px").style("fill","#555").style("font-weight","400");
				d3.selectAll(".legend_text")
					.style("font-size","20px").style("fill","#bbb").style("font-weight","700");

				if (data[0].length > 0) {
					var simulation = svg.selectAll(".simulation")
						.data(data)
						.enter().append("g")
						.attr("class", "simulation");

					simulation.append("path")
						.attr("class", "line")
						.attr("fill", "none")
						.attr("d", function(d) { return line(d); })
						.style("stroke", function(d,i) { return color(i); });
				}
				else {
					svg.append("path")
						.datum(data)
						.attr("class", "line")
						.attr("fill", "none")
						.attr("d", line)
						.style("stroke","steelblue");
				}
				d3.selectAll(".line").style("fill", "none").style("stroke-width","1.5px");
			}

			var data=[];
			var host_frequencies=[0,0];
			var parasite_frequencies=[0,0];
			var generations=400;
			var sh=0.2;
			var sp=0.1;

			function initialize_frequencies(){
				host_frequencies[0]=Math.random();
				data.push([host_frequencies[0]]);
				host_frequencies[1]=1-host_frequencies[0];
				data.push([host_frequencies[1]]);
				parasite_frequencies[0]=Math.random();
				data.push([parasite_frequencies[0]]);
				parasite_frequencies[1]=1-parasite_frequencies[0];
				data.push([parasite_frequencies[1]]);
			}

			initialize_frequencies();

			function calc_host_w_p(i,ii){
				return (i==ii?1-sh:1)*parasite_frequencies[ii]
			}

			function host_selection(){
				var total_host_frequencies=0;
				//alert(host_frequencies.length);
				for(var i=0;i<host_frequencies.length;i++){
					var host_fitness=0;
					for(var ii=0;ii<parasite_frequencies.length;ii++){
						host_fitness=host_fitness+calc_host_w_p(i,ii);
					}
					host_frequencies[i]=host_frequencies[i]*host_fitness;
					total_host_frequencies=total_host_frequencies+host_frequencies[i];
				}
				for(var i=0;i<host_frequencies.length;i++){
					host_frequencies[i]=host_frequencies[i]/total_host_frequencies;
				}
			}

			function calc_parasite_w_p(i,ii){
				return (i==ii?1:1-sp)*host_frequencies[ii]
			}

			function parasite_selection(){
				var total_parasite_frequencies=0;
				for(var i=0;i<parasite_frequencies.length;i++){
					var parasite_fitness=0;
					for(var ii=0;ii<host_frequencies.length;ii++){
						parasite_fitness=parasite_fitness+calc_parasite_w_p(i,ii);
					}
					parasite_frequencies[i]=parasite_frequencies[i]*parasite_fitness;
					total_parasite_frequencies=total_parasite_frequencies+parasite_frequencies[i];
				}
				for(var i=0;i<parasite_frequencies.length;i++){
					parasite_frequencies[i]=parasite_frequencies[i]/total_parasite_frequencies;
				}
			}

			for(var k=0;k<generations;k=k+1){
				//alert(data);
				host_selection();
				parasite_selection();
				data[0].push(host_frequencies[0]);
				data[1].push(host_frequencies[1]);
				data[2].push(parasite_frequencies[0]);
				data[3].push(parasite_frequencies[1]);
			}
			//alert(data);
			draw_line_chart(data,"Generations","p",[]);
		</script>
	</body>
</html>