Nature-in-code/spatial_simulation.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"></script>
	</head>
	<body>
		<script>

			function draw_grid(data,colors) {
				var width = 600;
				var height = 600;
				var grid_length = data.length;

				var svg = d3.select('body').append('svg')
					  .attr('width', width)
					  .attr('height', height);

				var rw = Math.floor(width/grid_length);
				var rh = Math.floor(height/grid_length);

				var g = svg.selectAll('g')
						.data(data)
						.enter()
						.append('g')
						.attr('transform', function (d, i) {
						  return 'translate(0, ' + (width/grid_length) * i + ')';
						});

				g.selectAll('rect')
						.data(function (d) {
						  return d;
						})
						.enter()
						.append('rect')
						.attr('x', function (d, i) {
						  return (width/grid_length) * i;
						})
						.attr('width', rw)
						.attr('height', rh)
						.attr('class',function(d) {
						  return d;
						});
				if (!colors) {
					d3.selectAll(".A1A1").style("fill","#fff");
					d3.selectAll(".A1A2").style("fill","#2176c9");
					d3.selectAll(".A2A2").style("fill","#042029");
				}
				else {
					for (var i = 0; i < colors.length; i = i + 2) {
						d3.selectAll("."+colors[i]).style("fill",colors[i+1]);
					}
				}
			}

			function update_grid(data,colors){
				var grid_length = data.length;
				d3.select('svg').selectAll('g')
					.data(data)
					.selectAll('rect')
					.data(function (d) {
					  return d;
					})
					.attr('class',function(d) {
					  return d;
					});
				if (!colors) {
					d3.selectAll(".A1A1").style("fill","#fff");
					d3.selectAll(".A1A2").style("fill","#2176c9");
					d3.selectAll(".A2A2").style("fill","#042029");
				}
				else {
					for (var i = 0; i < colors.length; i = i + 2) {
						d3.selectAll("."+colors[i]).style("fill",colors[i+1]);
					}
				}
			}

			var grid_length=100;
			var N=grid_length*grid_length;
			var grid=[];
			var p=0.5;	//frequency of a1 allele
			var a1a1=0;
			var a1a2=0;
			var a2a2=0;
			var generation_counter=0;
			var max_mating_distance=50;
			function init_grid(){
				for(var i=0;i<grid_length;i++){
					grid[i]=[];
					for(var ii=0;ii<grid_length;ii++){
						var random_number=Math.random();
						if(random_number<p*p){
							grid[i][ii]="A1A1";
							a1a1++;
						}else if(random_number>1-(1-p)*(1-p)){
							grid[i][ii]="A2A2";
							a2a2++;
						}else{
							grid[i][ii]="A1A2";
							a1a2++;
						}
					}
				}
				console.log(a1a1,a1a2,a2a2);
			}


			function find_random_int(min,max){
				return Math.floor(Math.random()*(max-min+1))+min;
			}
			function pick_matingpartner(i,ii){
				var j=find_random_int(i-max_mating_distance,i+max_mating_distance);
				var jj=find_random_int(ii-max_mating_distance,ii+max_mating_distance);
				// bounding at edges
				if(j<0){
					j=j+grid_length;
				}
				if(j>=grid_length){
					j=j-grid_length;
				}
				if(jj<0){
					jj=jj+grid_length;
				}
				if(jj>=grid_length){
					jj=jj-grid_length;
				}
				return grid[j][jj];
			}

			function get_offspring(parent1,parent2){
				var p1=parent1;
				var p2=parent2;

				if(p1=="A1A1" && p2=="A1A1"){
					return "A1A1";
				}else if(p1=="A2A2" && p2=="A2A2"){
					return "A2A2";
				}else if((p1=="A1A1" && p2=="A2A2") || (p1=="A2A2" && p2=="A1A1")){
					return "A1A2";
				}else if((p1=="A1A1" && p2=="A1A2")||(p1=="A1A2" && p2=="A1A1")){
					if(Math.random()<0.5){
						return "A1A1";
					}
					else{
						return "A1A2";
					}
				}else if((p1=="A2A2" && p2=="A1A2")||(p2=="A2A2" && p1=="A1A2")){
					if(Math.random()<0.5){
						return "A2A2";
					}
					else{
						return "A1A2";
					}
				}
				else if(p1=="A1A2" && p2=="A1A2"){
					var random_num=Math.random();
					if(random_num<0.25){
						return "A1A1";
					}else if(random_num>0.75){
						return "A2A2";
					}else{
						return "A1A2";
					}
				}
			}

			function print_data(){
				a1a1=0;
				a1a2=0;
				a2a2=0;

				for(var i=0;i<grid_length;i++){
					for(var ii=0;ii<grid_length;ii++){
						if(grid[i][ii]=="A1A1"){
							a1a1++;
						}else if(grid[i][ii]=="A1A2"){
							a1a2++;
						}else{
							a2a2++;
						}
					}
				}
				console.log("generation "+generation_counter+":");
				console.log(a1a1,a1a2,a2a2);
				p=(2*a1a1+a1a2)/(2*N);
				h_e=2*p*(1-p);
				h_o=a1a2/(N);
				F=(h_e-h_o)/h_e;
				console.log("F = "+F);
			}

			function run_nextgeneration(){
				var tempgrid=[];
				for(var i=0;i<grid_length;i++){
					tempgrid[i]=[];
					for(var ii=0;ii<grid_length;ii++){
						var mating_partner=pick_matingpartner(i,ii);
						tempgrid[i][ii]=get_offspring(mating_partner,grid[i][ii]);
					}
				}
				for(var i=0;i<grid_length;i++){
					for(var ii=0;ii<grid_length;ii++){
						grid[i][ii]=tempgrid[i][ii];
					}
				}

				print_data();
				generation_counter++;
			}

			init_grid();

			draw_grid(grid);

			function simulate_and_visualize(){
				run_nextgeneration();
				update_grid(grid);
			}
			setInterval(simulate_and_visualize,100)
			/*for(var i=0;i<100;i++){
				run_nextgeneration();
			}*/

		</script>
	</body>
</html>