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BBischof

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Horsey Race

Simulating the 538 Horsey Race.

forked from bricedev's block: French soccer championship replay

<!DOCTYPE html>
<meta charset="utf-8"> 
 
<style>

body {
  font: 10px sans-serif;
}

.x.axis path,.x.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}

.y.axis path {
  fill: none;
}

.y.axis line {
  fill: none;
  stroke: #eeeeee;
  shape-rendering: crispEdges;
}

.date {
  font: 500 196px "Helvetica Neue";
  fill: #aaa;
}
</style>

<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script>

var margin = {top: 20, right: 80, bottom: 0, left: 30},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var speed = 200;

var x = d3.scale.linear()
    .range([0, width-70]);

var y = d3.scale.ordinal()
    .rangeRoundBands([height, 0], .1);

var xAxis = d3.svg.axis()
    .scale(x)
    .tickSize(0)
    .orient("top");

var yAxis = d3.svg.axis()
    .scale(y)
    .tickSize(-width)
    .tickPadding(10)
    .orient("left");

var line = d3.svg.line()
    .x(function(d) { return x(d.matchday); })
    .y(function(d) { return y(d.position) + y.rangeBand()/2; });

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 + ")");

var clip = svg.append("clipPath")
	.attr("id", "clip")
  .append("rect")
    .attr("width", 0)
    .attr("height", height);
  
function rand_step(probability){
  return Math.random() < probability ? 1: -1 //if the horseys are more lazy than directionally challenged, make this 0
};
  
function run_race(race_length){
  horsey_probabilities = [.52,.54,.56,.58,.60,.62,.64,.66,.68,.70,.72,.74,.76,.78,.80,.82,.84,.86,.88,.90].reverse()
  horsey_paths = [[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[]]
  winning_position = 0
  while (winning_position < race_length) {
	  new_steps = horsey_probabilities.map(function(d){return rand_step(d)})
  	horsey_paths.map(function (list, idx) {
		  return list.push(new_steps[idx]);});
	  winning_position = Math.max.apply(Math, horsey_paths.map(function(d){return d.reduce((a, b) => a + b, 0)}))
//   console.log(winning_position);
	}
  return horsey_paths
}
  
function compute_rankings(paths){
//   paths = [[1,0,1,0],[0,1,1,1]]
  step_sums = paths.map(function(list){
    return list.map(function (i,idx){
      return list.slice(0,idx+1).reduce(function(acc, val) { 
        return acc + val; })})
  })
//   console.log(step_sums)
  convert_list_to_ranks([5,2,4,2,3,0]);
  rankings = matrix_transpose(
    matrix_transpose(step_sums)
    .map(function (col){
      return convert_list_to_ranks(col)
    }));
  rank_dict = rankings.map(function (horsey, horsey_idx){
    return horsey.map(function (position, day) {
      return {"matchday": day, "position": position, "steps": step_sums[horsey_idx][day]}
    })
  });
  
//   console.log(rank_dict);
  horsey_colors = ["#0162A6", "#014689", "#041C42", "#EA0001", "#CD003B", "#E00016", "#F5D30F", "#C91119", "#F58113", "#013893", "#0898D7", "#B0053A", "#EE2722", "#F36F21", "#FFD600", "#D4082D", "#B41309", "#E13328", "#269045", "#6F5B98"]
  standings_list = rank_dict.map(function (horsey_standings, horsey_number){
    return {"teamName": "Horsey"+(horsey_number+1),
            "color": horsey_colors[horsey_number], 
            "rank": horsey_standings
        }
  });
//  console.log(standings_list)
 return standings_list
}
  
function matrix_transpose(matrix){
  return matrix[0].map(function(col, i) {
    return matrix.map(function(row) {
        return row[i];
    });
});
}
  
function convert_list_to_ranks(list_of_sums){
  output = list_of_sums.map(function (i,idx){return ([idx+1, i]);})
    .sort(function(a,b) {return b[1] - a[1];})
    .map(function (p,idy){return ([p[0], idy+1])})
    .sort(function(a,b) {return a[0] - b[0];})
    .map(function (x){return x[1]})
	return output
}
  
function run_simulation(race_length){
  paths = run_race(race_length);
//   console.log(paths)
  race_dictionary = {
    "race": "Lucky Derby", 
    "standing": []
  }
  race_dictionary["standing"] = compute_rankings(paths);
  return race_dictionary
};

function draw(data) { 
  
  y.domain(
    d3.range(
      1,21
    ).reverse()
  );

x.domain(d3.extent(data.standing[0].rank.map(function(d) { return d.matchday; })));
  
  svg.append("g")
	.attr("class", "y axis")
  	.call(yAxis);

svg.append("g")
	.attr("class", "x axis")
  	.call(xAxis);

var club = svg.selectAll(".club")
      .data(data.standing)
    .enter().append("g")
      .attr("class", "club");

var path = club.append("path")
      .attr("class", "line")
      .style("stroke", function(d) { return d.color; })
      .style("stroke-width", 3)
      .style("fill","none")
      .attr("clip-path", function(d) { return "url(#clip)"; })
      .attr("d", function(d) { return line(d.rank); });

var circleStart = club.append("circle")
      .attr("cx", function(d) { return x(d.rank[0].matchday); })
      .attr("cy", function(d) { return y(d.rank[0].position) + y.rangeBand()/2; })
      .style("fill", function(d) { return d.color; })
      .attr("r", 3)

var circleEnd = club
  		.append("circle")
      .attr("cx", function(d) { return x(d.rank[0].matchday); })
      .attr("cy", function(d) { return y(d.rank[0].position) + y.rangeBand()/2; })
      .style("fill", function(d) { return d.color; })
      .attr("r", 3)

var label = club.append("text")
      .attr("transform", function(d) { return "translate(" + x(d.rank[0].matchday) + "," + (y(d.rank[0].position) + y.rangeBand()/2) + ")"; })
      .attr("x", 8)
      .attr("dy", ".31em")
      .on("mouseover", function (d) {
      	club.style("opacity",0);
      	club.filter(function(path) {return path.teamName === d.teamName; }).style("opacity",1);
      })
      .on("mouseout", function (d) { club.style("opacity",1); })
      .style("cursor","pointer")
      .style("fill", function(d) { return d.color; })
      .style("font-weight", "bold")
      .text(function(d) { return "🏇 #"+ d.rank[0].position + " " + d.teamName + " Steps:" + d.rank[0].steps; });

var matchday = 1;

var transition = d3.transition()
    .duration(speed)
    .each("start", function start() {

label.transition()
        .duration(speed)
        .ease('linear')
	    .attr("transform", function(d) { return "translate(" + x(d.rank[matchday].matchday) + "," + (y(d.rank[matchday].position) + y.rangeBand()/2) + ")"; })
	    .text(function(d) { return "🏇 #"+ d.rank[matchday].position  + " " + d.teamName + " Steps:" + d.rank[matchday].steps; });
  
      circleEnd.transition()
        .duration(speed)
        .ease('linear')
        .attr("cx", function(d) { return x(d.rank[matchday].matchday); })
        .attr("cy", function(d) { return y(d.rank[matchday].position) + y.rangeBand()/2; });

clip.transition()
        .duration(speed)
        .ease('linear')
        .attr("width", x(matchday+1))
        .attr("height", height);
      
      matchday+=1;

if (matchday !== data.standing[0].rank.length) transition = transition.transition().each("start", start);
     
    });

};

draw(run_simulation(200));
</script>

https://d3js.org/d3.v3.min.js