TP3-p3-5

Etapes de fabrication :

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
    
		svg {
  		font: 10px sans-serif;
		}
    
    .line { /* useless here */
      fill: none;
      stroke: black;
      stroke-width: 2.5px;
    }
  </style>
</head>

<body>
  <script>
    
    /* TODO : reindenter tout ca */// (by software)
    
    var margin = {top: 20, right: 40, bottom: 20, left: 100};
    var width = 760 - margin.left - margin.right;
    var height = 300 - margin.top - margin.bottom;
    
    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 + ")");

// See formats https://bl.ocks.org/zanarmstrong/raw/05c1e95bf7aa16c4768e/
    // Data sample {"name": "G", "value": 10, "date": "2016-07"}
    var parseDate = d3.timeParse("%b %Y");
    var displayDate = d3.timeFormat("%y");
    var displayValue = d3.format(",.0f");
    
    // Ordinal scale
    var x = d3.scaleTime()
        .range([0, width]);
		// Linear scale
    var y = d3.scaleLinear()
        .range([height, 0]);
    
    var color = d3.scaleOrdinal(d3.schemeCategory10);
    
    /* Fonctions dessineuses de formes. */
    var line = d3.area()
    	.curve(d3.curveBasis)
    	.x(function(d) { return x(d.date); })
    	.y0(function(d) { return y(d.price - 1) ; })
    	.y1(function(d) { return y(d.price + 1) ; });
    
    var area = d3.area()
    	.curve(d3.curveBasis)
    	.x(function(d) { return x(d.date); })
    	.y0(height)
    	.y1(function(d) { return y(d.price); });
    
    var separated_area = d3.area()
    	.curve(d3.curveBasis)
    	.x (function (d) { return x (d.date) ; })
    	.y0 (function (d) { return y (d.base) ; })
    	.y1 (function (d) { return y (d.price_on_base) ; });
   
    var stacked_area = d3.area()
    	.curve(d3.curveBasis)
    	.x(function(d) { return x(d.date); })
    	.y0(function(d) { return y(d.sum_others); })
    	.y1(function(d) { return y(d.price_on_others); });
    
    var centered_area = d3.area()
    	.curve(d3.curveBasis)
    	.x(function(d) { return x(d.date); })
    	.y0(function(d) { return y(d.sum_others_centered); })
    	.y1(function(d) { return y(d.price_on_others_centered); });
    
    var g = svg.append("g")	;
    
    d3.text(
      "https://gist.githubusercontent.com/mbostock/1256572/raw/44c086a6019de56dce35a47197a19468b3e4ad57/stocks.csv", 
      function (err,rawData) {
    		
        var dsv  = d3.dsvFormat (',') ;
        var data = dsv.parse (rawData) ;
        data.forEach(function(d) {
					d.price = +d.price;
        	d.date = parseDate(d.date);
      	});
        var n_data = d3.nest ()
        	.key (function (d) { return d.symbol ; })
        	.entries (data) ;
        
        /* Du gros JS pour tirer des donnees */
        // stacked et centered :
        for (i = 0; i < n_data.length; ++i) {
          for (j = 0; j < n_data[i].values.length; ++j) {
            var elem = n_data[i].values[j] ;
            elem.sum_others = 0 ;
            for (k = i + 1; k < n_data.length; ++k) {
              elem.sum_others += n_data[k].values[j].price ;
            }
            elem.price_on_others = elem.price + elem.sum_others ;
          }
        }
      
      var maxY = d3.max(data, function(d) { return d.price_on_others; }) ;
      x.domain(d3.extent(data, function(d) { return d.date; }));
        
      // centered :
      for (i = 0; i < n_data[0].values.length; ++i) {
        var blank_under = (maxY - n_data[0].values[i].price_on_others) / 2 ;
        for (j = 0; j < n_data.length; ++j) {
          var elem = n_data[j].values[i] ;
          elem.price_on_others_centered = elem.price_on_others 
                                         + blank_under ;
          elem.sum_others_centered      = elem.sum_others      
                                         + blank_under ;
        }
      }
        
      // separated :
      for (i = 0; i < n_data.length; ++i) {
        n_data[i].max_price = d3.max(n_data[i].values, function (d) {
          return d.price ;
        }) ;
      }
      var max_max_price = d3.max(n_data, function (d) { 
        return d.max_price ;}) ;
      for (i = 0; i < n_data.length; ++i) {
        for (j = 0; j < n_data[i].values.length; ++j) {
          var elem = n_data[i].values[j] ;
          elem.base = (max_max_price / 4) * (n_data.length - (i + 1)) ;
          var normalized_price = max_max_price * elem.price
          											 / n_data[i].max_price ;
          elem.price_on_base = (normalized_price / n_data.length) 
            								    + elem.base ;
          
        }
      }
        
      console.log(n_data);
     
    /* Factorisation du code */
    // Axes :
    function create_axis_x () {
      svg.append("g")
        .attr("class", "axis axis--x")
        .attr("transform", "translate(0," + height + ")")
        .call(d3.axisBottom(x))
      	.transition() // <-- kinda dummy
      		.delay(1775).remove() ; // <-- empirique, a ameliorer
    }
    function create_axis_y () {
      svg.append("g")
        .attr("class", "axis axis--y")
        .attr("transform", "translate(0,0)")
        .call(d3.axisLeft(y).ticks(20))
      	.transition() // <-- kinda dummy
      		.delay(1775).remove() ; // <-- tatonnement, a revoir
    }
    function axises () {
      create_axis_x () ;
      create_axis_y () ;
    }
        
    // Dessiner les courbes :
    function area_generalizer (area_func, color_opacity) {
      g.selectAll(".area").data(n_data).enter().append("path")
        .attr("class", "area")
        .attr("d", function (d) { return area_func (d.values) } )
      	.attr("fill", function(d,i) { return color (d.key) ; })
      	.attr("opacity", color_opacity)
      g.selectAll(".area")
        .attr("class", "area")
      .transition().duration(1000)
        .attr("d", function (d) { return area_func (d.values) } )
      	.attr("fill", function(d,i) { return color (d.key) ; })
      	.attr("opacity", color_opacity);
    }
        
    // Legendes :
    function top_left_legend (opacity) {
      var legend = svg.selectAll(".legend").data(color.domain())
    		.enter().append("g")
  			.attr("class", "legend")
  			.attr("transform", function(d, i) { 
          return "translate(0," + i * 20 + ")"; })
      svg.selectAll(".legend")
          .attr ("class", "legend")
      	.transition().duration(1000)
      		.attr("transform", function(d, i) { 
        		return "translate(0," + i * 20 + ")"; })
      		.select("rect").attr("opacity", opacity);
      return legend ;
    }
        
    function right_legend (upper_bound, lower_bound) {
      var legend = svg.selectAll(".legend").data(color.domain())
    		.enter().append("g")
  			.attr("class", "legend")
  			.attr("transform", function(d, i) { 
      	  var vals = n_data[i].values ;
       	  return "translate(" + (width - 40) + "," 
          	+ (y((vals[vals.length - 1][upper_bound]
                	+ vals[vals.length - 1][lower_bound]) / 2)) 
          	+ ")"; })          
      svg.selectAll(".legend")
          .attr ("class", "legend")
      	.transition().duration(1000)
      		.attr("transform", function(d, i) { 
      	  var vals = n_data[i].values ;
       	  return "translate(" + (width - 40) + "," 
          	+ (y((vals[vals.length - 1][upper_bound]
                	+ vals[vals.length - 1][lower_bound]) / 2)) 
          	+ ")"; })
      		.select("rect").attr("opacity", 0);
      return legend ;
    }
        
    // Le texte de la legende :
    function legend_append_text (legend) {
     	legend.append("text")
      	.attr("x", 50)
      	.attr("y", 9)
      	.attr("dy", ".35em")
      	.style("text-anchor", "start")
      	.text(function(d) { return d; });
    }
        
    // Le rectangle de la legende ;
    function legend_append_rect (legend, opacity) {
      legend.append("rect")
     		.attr("x", 30)
     		.attr("width", 18)
     		.attr("height", 18)
     		.style("fill", color)
      	.attr("opacity", opacity);
    }
        
    /* Balancer les vues */
    function lined () {
      y.domain([0, d3.max(data, function(d) { return d.price; })]);
      axises () ;      
      area_generalizer (line, 1) ;      
      var legend = top_left_legend (1);
 			legend_append_text (legend) ;
      legend_append_rect (legend, 1) ;
      setTimeout (transparent, 2000) ;
    }
        
    function transparent () {
      y.domain([0, d3.max(data, function(d) { return d.price; })]);
      axises () ;      
      area_generalizer (area, .5) ;     
      var legend = top_left_legend (.5);
 			legend_append_text (legend) ;
      legend_append_rect (legend, .5) ;  		
      setTimeout (separated, 2000) ;
    }
        
    function separated () {
      y.domain([0, d3.max(data, function(d) { return d.price; })]);
      create_axis_x () ;      
      area_generalizer (separated_area, 1) ;       
      var legend = right_legend ("price_on_base", "base") ;   
 			legend_append_text (legend) ;     
      setTimeout (stacked, 2000) ;
    }
        
    function stacked () {
      y.domain([0, maxY]);
      axises () ;      
      area_generalizer (stacked_area, 1) ;      
      var legend = right_legend ("price_on_others", "sum_others") ;   
 			legend_append_text (legend) ;      
      setTimeout (centered, 2000) ;
    }
        
    function centered () {
      y.domain([0, maxY]);
      axises () ;      
      area_generalizer (centered_area, 1) ;      
      var legend = right_legend ("price_on_others_centered",
                                 "sum_others_centered") ;
 			legend_append_text (legend) ;      
      setTimeout (lined, 2000) ;
    }
      
    /* start */
    lined();

});

</script>
</body>

https://d3js.org/d3.v4.min.js