Widgetception/chart.html at develop · Hackception/Widgetception · GitHub

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

body {
  font: 10px sans-serif;
}

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

.dot {
  stroke: #000;
}

path.interpolation, path.true-interpolation {
  fill: none;
  stroke: #000;
  stroke-width: 1px;
}

</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script>
<script src="/colorbrewer.js"></script>
<script>
// These constants define the heatmap pixel coordinate system.
var WIDTH = 60, HEIGHT = 40;

d3.argmin = function(arr, acc){
  return _.zip(arr.map(acc), arr).sort(function(a,b){
    return d3.ascending(a[0], b[0]);
  })[0][1];
};

function lineChart(){
  var width_ = 850, height_ = 500,
      margin = {top: 20, right: 20, bottom: 30, left: 40};

  var xRange = [0, 100, 10],
      yRange = [0, 100, 10],
      xLabel = 'Sepal Width (cm)',
      yLabel = 'Sepal Length (cm)';

  var x = d3.scale.linear();

  var y = d3.scale.linear();

  var xAxis = d3.svg.axis()
      .scale(x)
      .orient("bottom");

  var yAxis = d3.svg.axis()
      .scale(y)
      .orient("left");

  var userLine = [],
      trueLine = [
    {x: 0, y: 20},
    {x: 10, y: 25},
    {x: 20, y: 27},
    {x: 30, y: 32},
    {x: 40, y: 34},
    {x: 50, y: 39},
    {x: 60, y: 42},
    {x: 70, y: 59},
    {x: 80, y: 68},
    {x: 90, y: 72},
    {x: 100, y: 79}
  ];

  // reserve some variables inside the closure for
  // methods that will be defined within chart()
  var drawTrueLine, drawHeatmap, hideHeatmap,
      drawUserLine, xChoices, heatmap;
  heatmap = d3.range(HEIGHT).map(function(){
    return d3.range(WIDTH);
  });
  function chart() {
    var width = width_ - margin.left - margin.right,
        height = height_ - margin.top - margin.right;
    x.domain([xRange[0], xRange[1]])
      .range([0, width]);
    y.domain([yRange[0], yRange[1]])
      .range([height, 0]);

    var line = d3.svg.line()
        .interpolate('cardinal')
        .x(function(d){return x(d.x);})
        .y(function(d){return y(d.y);});

    xChoices = d3.range.apply(null, xRange);
    //user expects fully closed interval rather than half-open
    xChoices.push(xRange[1]);
    var svg = this.selectAll('svg')
      .data([undefined]);

    //Create the skeletal chart, if it doesn't already exist.
    var gEnter = svg.enter().append("svg").append('g');
    gEnter.append('g').attr('class', 'heat-map');
    gEnter.append('g').attr('class', 'x axis')
      .append('text').attr('class', 'x label');
    gEnter.append('g').attr('class', 'y axis')
      .append('text').attr('class', 'y label');
    gEnter.append('g').attr('class', 'warn-missing');
    gEnter.append('rect').attr('class', 'drag-target');
    gEnter.append('g').attr('class', 'user-line')
      .append('path').attr('class', 'interpolation');
    gEnter.append('g').attr('class', 'true-line')
      .append('path').attr('class', 'true-interpolation');

    svg
      .attr("width", width_)
      .attr("height", height_);
    var g = svg.select('g')
      .attr("transform", "translate(" + margin.left + "," + margin.top + ")");


    flashMissing = function(){
      var missingXs = _.difference(xChoices, _.pluck(userLine, 'x'));
      if (missingXs.length === 0) return;

      var rectWidth = x(1.0) - x(0);
      var warningRect = g.select('g.warn-missing')
        .selectAll('rect.warning')
        .data(missingXs);
      warningRect.enter()
        .append('rect').attr('class', 'warning');
      warningRect.exit().remove();
      warningRect
        .attr('x', function(d, ix){
          if (d === 0){
            return x(d);
          }
          else if (d === xChoices[xChoices.length - 1]){
            return x(d) - rectWidth/2;
          }
          return x(d) - rectWidth/2;
         })
        .attr('height', height)
        .attr('width', function (d, ix){
          return d === 0 ? rectWidth/2 :
                 d === xChoices[xChoices.length - 1] ? rectWidth/2 :
                 rectWidth;
         })
        .attr('fill', 'orange')
        .attr('fill-opacity', 0.3)
      .transition()
        .duration(2000)
        .attr('fill-opacity', 0)
        .each('end', function(){
          d3.select(this).remove();
        });
    };


    g.select("g.x.axis")
        .attr("transform", "translate(0," + height + ")")
        .call(xAxis)
      .select("text.label")
        .attr("x", width)
        .attr("y", -6)
        .style("text-anchor", "end")
        .text(xLabel);

    g.select("g.y.axis")
        .call(yAxis)
      .select("text.label")
        .attr("class", "label")
        .attr("transform", "rotate(-90)")
        .attr("y", 6)
        .attr("dy", ".71em")
        .style("text-anchor", "end")
        .text(yLabel);


    g.select('rect.drag-target')
      .attr('width', width)
      .attr('height', height)
      .style('fill-opacity', 0.0);

    drawUserLine = function(){
      var dots = g.select('g.user-line').selectAll('.dot')
          .data(userLine);
      dots.enter().append('circle').attr('class', 'dot');
      dots.exit().remove();
      dots
          .attr("r", 3.5)
          .attr("cx", function(d) { return x(d.x); })
          .attr("cy", function(d) { return y(d.y); })
          .style("fill", 'tomato');
      userLine.sort(function(a,b){
        return d3.ascending(a.x, b.x);
      });
      g.select('path.interpolation')
        .attr('d', line(userLine));
    };

    function setClosestPoint(){
      var e = d3.event,
        pxX = e.x,
        pxY = e.y,
        scaleX = x.invert(pxX),
        scaleY = Math.max(yRange[0], Math.min(yRange[1], y.invert(pxY))),
        snapToX = d3.argmin(xChoices, function(c){
          return Math.abs(scaleX - c);
        });
      // Remove any values with that x choice
      userLine = _.reject(userLine, function(d){ return d.x === snapToX; });
      // Add the new values
      userLine.push({x: snapToX, y:scaleY});
      drawUserLine();
    }
    var drag = d3.behavior.drag()
        .on('drag', setClosestPoint)
        .on('dragend', flashMissing);
    g.select('rect.drag-target').call(drag)

    drawTrueLine = function(){
      var dots = g.select('g.true-line').selectAll('.dot')
          .data(trueLine);
      dots.enter().append('circle').attr('class', 'dot');
      dots.exit().remove();
      dots
          .attr("r", 3.5)
          .attr("cx", function(d) { return x(d.x); })
          .attr("cy", function(d) { return y(d.y); })
          .style("fill", 'steelblue');
      g.select('path.true-interpolation')
        .attr('d', line(trueLine));
    };

    drawHeatmap = function(){
      /* A brief review of the coordinate systems
        we have in play:
          - WIDTH x HEIGHT: this is the coordinate
          system for the heatmap. It is uniform across
          all clients and persists to our database.
          - width x height: this is the coordinate
          system for the svg pixels.
          - xRange x yRange: this coordinate system is
          user defined. It is the numbers drawn on the
          axes on the page. The server was kind enough
          to convert from this system to the heatmap
          system, so we can avoid thinking about it.

        We have a 2d array in heatmap coords, and we need
        to project it into a canvas image in svg coords.

        We'll make some scales to do this.
      */
      var hm = _.flatten(heatmap).sort(d3.ascending);

      var xScale = d3.scale.linear()
          .domain([0, WIDTH])
          .range([0, width]),
        yScale = d3.scale.linear()
          .domain([0, HEIGHT])
          .range([height, 0]),
        color = d3.scale.threshold()
          .domain(d3.range(9).map(function(ix){
            return d3.quantile(hm, (ix + 1) / 9) + 1;
          }))
          .range(colorbrewer.Purples[9])

      var heatRow = g.select('g.heat-map')
        .selectAll('g.heat-row')
        .data(heatmap)
      .enter()
        .append('g').attr('class','heat-row')
        .attr('transform', function(d, ix){
          return 'translate(0,' + yScale(ix) +  ')';
        });

      heatRow.selectAll('g.heat-cell')
        .data(function(d){return d;})
      .enter()
        .append('g').attr('class', 'heat-cell')
        .attr('transform', function(d, ix){
          return 'translate(' + xScale(ix) + ',0)';
        })
        .append('rect')
        .attr('y', yScale(1) - yScale(0))
        .attr('width', xScale(1) - xScale(0))
        .attr('height', yScale(0) - yScale(1))
        .attr('fill', color);

    };

    hideHeatmap = function(){
      g.select('g.heat-map').selectAll('g.heat-row')
        .data([]).exit().remove();
    };

  }

  //attach public methods;
  chart.drawTrueLine = function(){
    return drawTrueLine();
  };
  chart.height = function(_){
    if (!arguments.length) return height_;
    height_ = _; return chart;
  };
  chart.width = function(_){
    if (!arguments.length) return width_;
    width_ = _; return chart;
  };
  chart.margins = function(changes){
    if (!arguments.length)  return margin;
    _.each(['top','bottom','left','right'], function(k){
      if (changes[k]){
        margin[k] = changes[k];
      }
    });
    return chart;
  };
  chart.xRange = function(_){
    if (!arguments.length) return xRange;
    xRange = _; return chart;
  };
  chart.yRange = function(_){
    if (!arguments.length) return yRange;
    yRange = _; return chart;
  };
  chart.xLabel = function(_){
    if (!arguments.length) return xLabel;
    xLabel = _; return chart;
  };
  chart.yLabel = function(_){
    if (!arguments.length) return yLabel;
    yLabel = _; return chart;
  };
  chart.userLine = function(_){
    if (!arguments.length) return userLine;
    userLine = _;
    drawUserLine();
    return chart;
  };
  chart.trueLine = function(_){
    if (!arguments.length) return trueLine;
    trueLine = _; return chart;
  };
  chart.drawHeatmap = function(){
    drawHeatmap();
  };
  chart.hideHeatmap = function(){
    hideHeatmap();
  };
  chart.isComplete = function(){
    return userLine.length === xChoices.length;
  };
  chart.flashMissing = function(){
    return flashMissing();
  };

  return chart;

}

var theChart = lineChart()
        .height(Math.min(500, window.innerHeight))
        .width(Math.min(800, window.innerWidth))
        .margins({left: 30, top:100})
        .xLabel('garbage')
        .yLabel('food')
        .xRange([0, 20, 1])
        .yRange([0, 1, 0.1]);


d3.select('body').call(theChart);

</script>