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graemebruce

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Interactive Small Multiples - Step 4

Built with blockbuilder.org

forked from ColinEberhardt's block: Interactive Small Multiples - Step 1

forked from ColinEberhardt's block: Interactive Small Multiples - Step 2

forked from ColinEberhardt's block: Interactive Small Multiples - Step 3

<!DOCTYPE html>
<script src="https://unpkg.com/d3@4.6.0"></script>
<script src="https://unpkg.com/d3fc@12.1.0"></script>

<style>
  body {
    font: 12px sans-serif;
  }
  .area {
    fill: #cec6b9;
  }
  #small-multiples > div {
    display: inline-block;
    width: 240px;
    height: 185px;
  }
  .tooltip .x-axis .tick {
    display: none;
  }
  .x-axis .domain, .x-axis .tick path,
  .y-axis .domain, .y-axis .tick path {
    display: none;
  }
  .plot-area {
    overflow: visible !important;
  }
  .x-axis {
    height: 1.5em !important;
  }
  .gridline-x {
    stroke: white;
  }
  .point {
    fill: black;
  }
  .point text {
    text-anchor: middle;
    transform: translateY(-10px);
    font-size: 10px;
    stroke: none;
  }
  .bottom-handle {
    text-anchor: middle;
    alignment-baseline: hanging;
   	font-size: 10px;
    transform: translateY(1.5em);
  }
  .top-handle {
    display: none;
  }
  .annotation-line line {
    display: none;
  }
</style>

<div id='small-multiples'></div>

<script>
d3.tsv('askmefi_category_year.tsv')
  .row(function(r) {
  	return {
  		category: r.category,
  		n: Number(r.n),
      year: Number(r.year)
    }
  })
  .get(function(data) {
    var nested = d3.nest()
    	.key(function(k) { return k.category; })
    	.entries(data);
  
  	nested.forEach(function(g) {
      g.trackball = [];
    });
  	  
    var yExtent = fc.extentLinear()
      .accessors([function(d) { return d.n; }])
    	.pad([0, 0.2])
    	.include([0]);
  
  	var xExtent = fc.extentLinear()
    	.accessors([function(d) { return d.year; }]);

var area = fc.seriesSvgArea()
      .crossValue(function(d) { return d.year; })
      .mainValue(function(d) { return d.n; });
  
  	var line = fc.seriesSvgLine()
      .crossValue(function(d) { return d.year; })
      .mainValue(function(d) { return d.n; });
  
  	var gridlines = fc.annotationSvgGridline()
    	.xTicks(0)
    	.yTicks(3);
  
  	var point = fc.seriesSvgPoint()
      .crossValue(function(d) { return d.year; })
      .mainValue(function(d) { return d.value; })
    	.size(25)
    	.decorate(function(selection) {
        selection.enter()
        	.append('text');        
        selection.select('text')
        	.text(d => d.value)
      })
    
    var line = fc.annotationSvgLine()
    	.orient('vertical')
      .value(function(d) { return d.year; })
    	.decorate(function(selection) {
        selection.enter()
        	.select('.bottom-handle')
        	.append('text');        
        selection.select('.bottom-handle text')
        	.text(d => d.year)
      })
     
  
  	var multi = fc.seriesSvgMulti()
    	.series([area, line, gridlines, line, point])
      .mapping(function(data, index, series) {
        switch (series[index]) {
        case point:            
        case line:
          return data.trackball;
        default:
          return data.values;
        }
      });
  
  	var xScale = d3.scaleLinear();
 
    // create a chart
    var chart = fc.chartSvgCartesian(
        xScale,
        d3.scaleLinear())
      .yDomain(yExtent(data))
    	.xDomain(xExtent(data))
    	.xLabel(function(d) { return d.key; })
    	.yTicks(3)
    	.xTicks(2)
    	.xTickFormat(d3.format('0'))
      .yOrient('left')
    	.plotArea(multi);
  
    function render() {
    	var update = d3.select('#small-multiples')
        .selectAll('div.multiple')
        .data(nested);
      update.enter()
        .append('div')
      	.classed('multiple', true)
      	.merge(update)
        .call(chart)
        .classed('tooltip', function(d) { return d.trackball.length; });

// add the pointer component to the plot-area, re-rendering
      // each time the event fires.
      var pointer = fc.pointer()
        .on('point', function(event) {
          if (event.length) {
            // determine the year
            var year = Math.round(xScale.invert(event[0].x));
            // add the point to each series
            nested.forEach(function(group) {
              var value = group.values.find(function(v) { return v.year === year; });
              group.trackball = [{
                year: year,
                value: value.n
              }];
            })
          } else {
            nested.forEach(function(g) {
              g.trackball = [];
            })
          }
          render();
        });

d3.selectAll('#small-multiples .plot-area')
        .call(pointer);  
    }
  
  	render();
	});

</script>

https://unpkg.com/d3@4.6.0

https://unpkg.com/d3fc@12.1.0