TP3-InClass-2-Stock-20171128

forked from romsson's block: simple line chart from dataset

forked from romsson's block: TP3-InClass-2-Stock

forked from keikhcheung's block: TP3-InClass-2-Stock

<!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 {
      fill: none;
      stroke: black;
      stroke-width: 1.5px;
    }
  </style>
</head>

<body>
  <script>
    
    /*** DEMO https://blockbuilder.org/romsson/57eb273e01761b829aaa95b28c8193c1 ***/
    
    // Feel free to change or delete any of the code you see in this editor!
    
    /**********
     PREDEFINITION Start
     *******/
    
    // Size of the 'body' space containing the svg
    var margin = {top: 40, right: 35, bottom: 20, left: 70},
      width = 900 - margin.left - margin.right,
      height = 450 - margin.top - margin.bottom;
    
    var svg = d3.select("body").append("svg")
      // Size of the svg 'canvas' showing the drawn graph
      .attr("width", width + margin.left + margin.right)
      .attr("height", height + margin.top + margin.bottom)
      .append("g")
      .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

// https://bl.ocks.org/zanarmstrong/raw/05c1e95bf7aa16c4768e/
    // %b shows month in abbreviated written name; %Y shows year in numbers
    // Formats: https://github.com/d3/d3-time-format
    var parseDate = d3.timeParse("%b %Y");
    // OBSOLETE var parseDate = d3.timeFormat("%Y-%m");
    // OBSOLETE var displayDate = d3.timeFormat("%b %Y");
    // OBSOLETE var displayValue = d3.format(",.0f");
    
    // Ordinal scale
    // d3.scaleOrdinal() changed to d3.scaleTime()
    var x = d3.scaleTime()
        .range([0, width]);

var y = d3.scaleLinear()
        .range([height, 0]);

// For legends; .schemeCategory10 is a preset of categorical colours
    // https://bl.ocks.org/aaizemberg/78bd3dade9593896a59d
    var c = d3.scaleOrdinal(d3.schemeCategory10);

/**********
     PREDEFINITION End
     *******/
    
    var line = d3.line()
        // .curve(d3.curveBasis) allows smoothing of the curve
        .curve(d3.curveBasis)
        .x(function(d) { return x(d.date); })
        .y(function(d) { return y(d.price); });

/**********
     DATA TREATMENT Start
     *******/
    
    d3.text('dataset.csv', function(error, raw) {
    
/*** OBSOLETE
     LOADED NEW 'dataset.csv' file instead of pulling 'dataset.json'
    // Replacing "dataset.json" with Data CSV file URL: https://gist.githubusercontent.com/mbostock/1256572/raw/44c086a6019de56dce35a47197a19468b3e4ad57/stocks.csv
    // Parsing the CSV file is preliminary
    // d3.csv exists as a function but the flexibility in coding a CSV file makes it difficult to adopt directly this function.
    // Manual parsing is hence recommended.
    // function(error, raw) allows console.log(raw) to observe raw data
    d3.json("https://gist.githubusercontent.com/mbostock/1256572/raw/44c086a6019de56dce35a47197a19468b3e4ad57/stocks.csv", function(error, raw) {
      
      console.log(raw)
***/  
      // Parsing starts here
      var dsv = d3.dsvFormat(',');
      var data = dsv.parse(raw);
    
      // Nesting
      // Pull data and nest them under nested_data (§ 'symbols' as in DEMO)
      // Make as many nests as as many grouped data 
      var nested_data = d3.nest()
        .key(function(d) { return d.symbol; })
        .entries(data);
        /*** OBSOLETE
        // .rollup show 'value' in console in one numeric value instead of value content
        .rollup(function(leaves) { 
           return d3.sum(leaves, function(d) {
             return d.price;
           });
        })
        .entries(data);
      
      console.log(nested_data)
      ***/
      
      // Pre-processing
      // In fact, not pre-processing anymore, as now shifted after 'Nesting'
      // ¿¿Cannot really understand what these lines are for??
      nested_data.forEach(function(s) {
        s.values.forEach(function(d) {
          // The following line puts date ticks on x-axis
          d.date = parseDate(d.date);
          // The following line seems to affect the fluctuation of drawn paths
          d.price = +d.price;
      });
      
        // The following line gives values to the lines and is primordial to the display of ticks on y-axis
        s.maxPrice = d3.max(s.values, function(d) { return d.price; });
        // ¿¿??
        s.sumPrice = d3.sum(s.values, function(d) { return d.price; });

console.log(data)
      });

/**********
     DATA TREATMENT End
     *******/
      
    /**********
     GRAPH-DRAWING Start
     *******/
      
      x.domain(d3.extent(data, function(d) { return d.date; }));
      // OBSOLETE x.domain(data.map(function(d) { return d.name; }));
			y.domain([0, d3.max(nested_data.map(function(d) { return d.maxPrice; }))]);
      // OBSOLETE y.domain([0, d3.max(nested_data.map(function(d) { return d.value; }))]);

/*** REMOVED CODE CONVERNTING TEXT AND VALUE (talking about from 'simple line chart from dataset' https://blockbuilder.org/romsson/855207ac5fb5c170de59b9c69ea56012) ***/
      
      // Path-/line-drawing
      // nested_data is a table of a table (in replacement of [data] in general)
      
      // Add a path element for each 'symbol' in nested_data, i.e. each stock
      // with the desired style
      svg.selectAll(".line").data(nested_data).enter()
        .append("path")
          .attr("class", "line")
          // Draw values of 'd'
          .attr("d", function(d) { return line(d.values); })
          .style("stroke", function(d) {return c(d.key); });
      
      svg.append("g")
          .attr("class", "axis axis--x")
          // x-axis position
          .attr("transform", "translate(0," + height + ")")
          .call(d3.axisBottom(x));
      
      svg.append("g")
          .attr("class", "axis axis--y")
          // .ticks(n) allows number of labels on the y-axis scale
          .call(d3.axisLeft(y).ticks(20));

// Adding labels and placing them in a certain position
      var legend = svg.selectAll("#label").data(c.domain()).enter()
        .append("g")
        .attr("id", "label")
        // Positioning of the legends
        .attr("transform", function(d, i) { 
          return "translate(0, " + (i * 20 ) + ")" 
        });
        
      // Coloured squares in legends
      legend.append("rect")
        .attr("x", 30)
        .attr("width", 18)
        .attr("height", 18)
        // 'c' contains the colour scheme for the legend squares
        .style("fill", c)
      
      legend.append("text")
        .attr("x", 50)
        .attr("y", 9)
        .attr("dy", ".35em")
        .style("text-anchor", "start")
        .text(function(d) { console.log(d.key); return d; })
        // OBSOLETE .text(function(d) { console.log(d.key); return d.key; })
      
    });

/**********
     GRAPH-DRAWING End
     *******/

</script>
</body>

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