peterk87/README.md

## README.md

      
    Raw
  

              README.md
            
          
    JS+D3: Zoomable, pannable scatterplot with shift keypress enabled brush multiselect of data points

This JS+D3 gist creates a scatterplot with zooming and panning enabled as well as a brush for selecting or deselecting points using the iris dataset within data.tsv.
The "Get Selection" button gets the current selection of points and prints their ids to the JS console (i.e. console.log(selection);).
The "Clear Selection" button clears the current selection.

  
## data.tsv

          
            sepalLength
            sepalWidth
            petalLength
            petalWidth
            species

            
              5.1
              3.5
              1.4
              0.2
              setosa

            
              4.9
              3.0
              1.4
              0.2
              setosa

            
              4.7
              3.2
              1.3
              0.2
              setosa

            
              4.6
              3.1
              1.5
              0.2
              setosa

            
              5.0
              3.6
              1.4
              0.2
              setosa

            
              5.4
              3.9
              1.7
              0.4
              setosa

            
              4.6
              3.4
              1.4
              0.3
              setosa

            
              5.0
              3.4
              1.5
              0.2
              setosa

            
              4.4
              2.9
              1.4
              0.2
              setosa

            
              4.9
              3.1
              1.5
              0.1
              setosa

            
              5.4
              3.7
              1.5
              0.2
              setosa

            
              4.8
              3.4
              1.6
              0.2
              setosa

            
              4.8
              3.0
              1.4
              0.1
              setosa

            
              4.3
              3.0
              1.1
              0.1
              setosa

            
              5.8
              4.0
              1.2
              0.2
              setosa

            
              5.7
              4.4
              1.5
              0.4
              setosa

            
              5.4
              3.9
              1.3
              0.4
              setosa

            
              5.1
              3.5
              1.4
              0.3
              setosa

            
              5.7
              3.8
              1.7
              0.3
              setosa

            
              5.1
              3.8
              1.5
              0.3
              setosa

            
              5.4
              3.4
              1.7
              0.2
              setosa

            
              5.1
              3.7
              1.5
              0.4
              setosa

            
              4.6
              3.6
              1.0
              0.2
              setosa

            
              5.1
              3.3
              1.7
              0.5
              setosa

            
              4.8
              3.4
              1.9
              0.2
              setosa

            
              5.0
              3.0
              1.6
              0.2
              setosa

            
              5.0
              3.4
              1.6
              0.4
              setosa

            
              5.2
              3.5
              1.5
              0.2
              setosa

            
              5.2
              3.4
              1.4
              0.2
              setosa

            
              4.7
              3.2
              1.6
              0.2
              setosa

            
              4.8
              3.1
              1.6
              0.2
              setosa

            
              5.4
              3.4
              1.5
              0.4
              setosa

            
              5.2
              4.1
              1.5
              0.1
              setosa

            
              5.5
              4.2
              1.4
              0.2
              setosa

            
              4.9
              3.1
              1.5
              0.2
              setosa

            
              5.0
              3.2
              1.2
              0.2
              setosa

            
              5.5
              3.5
              1.3
              0.2
              setosa

            
              4.9
              3.6
              1.4
              0.1
              setosa

            
              4.4
              3.0
              1.3
              0.2
              setosa

            
              5.1
              3.4
              1.5
              0.2
              setosa

            
              5.0
              3.5
              1.3
              0.3
              setosa

            
              4.5
              2.3
              1.3
              0.3
              setosa

            
              4.4
              3.2
              1.3
              0.2
              setosa

            
              5.0
              3.5
              1.6
              0.6
              setosa

            
              5.1
              3.8
              1.9
              0.4
              setosa

            
              4.8
              3.0
              1.4
              0.3
              setosa

            
              5.1
              3.8
              1.6
              0.2
              setosa

            
              4.6
              3.2
              1.4
              0.2
              setosa

            
              5.3
              3.7
              1.5
              0.2
              setosa

            
              5.0
              3.3
              1.4
              0.2
              setosa

            
              7.0
              3.2
              4.7
              1.4
              versicolor

            
              6.4
              3.2
              4.5
              1.5
              versicolor

            
              6.9
              3.1
              4.9
              1.5
              versicolor

            
              5.5
              2.3
              4.0
              1.3
              versicolor

            
              6.5
              2.8
              4.6
              1.5
              versicolor

            
              5.7
              2.8
              4.5
              1.3
              versicolor

            
              6.3
              3.3
              4.7
              1.6
              versicolor

            
              4.9
              2.4
              3.3
              1.0
              versicolor

            
              6.6
              2.9
              4.6
              1.3
              versicolor

            
              5.2
              2.7
              3.9
              1.4
              versicolor

            
              5.0
              2.0
              3.5
              1.0
              versicolor

            
              5.9
              3.0
              4.2
              1.5
              versicolor

            
              6.0
              2.2
              4.0
              1.0
              versicolor

            
              6.1
              2.9
              4.7
              1.4
              versicolor

            
              5.6
              2.9
              3.6
              1.3
              versicolor

            
              6.7
              3.1
              4.4
              1.4
              versicolor

            
              5.6
              3.0
              4.5
              1.5
              versicolor

            
              5.8
              2.7
              4.1
              1.0
              versicolor

            
              6.2
              2.2
              4.5
              1.5
              versicolor

            
              5.6
              2.5
              3.9
              1.1
              versicolor

            
              5.9
              3.2
              4.8
              1.8
              versicolor

            
              6.1
              2.8
              4.0
              1.3
              versicolor

            
              6.3
              2.5
              4.9
              1.5
              versicolor

            
              6.1
              2.8
              4.7
              1.2
              versicolor

            
              6.4
              2.9
              4.3
              1.3
              versicolor

            
              6.6
              3.0
              4.4
              1.4
              versicolor

            
              6.8
              2.8
              4.8
              1.4
              versicolor

            
              6.7
              3.0
              5.0
              1.7
              versicolor

            
              6.0
              2.9
              4.5
              1.5
              versicolor

            
              5.7
              2.6
              3.5
              1.0
              versicolor

            
              5.5
              2.4
              3.8
              1.1
              versicolor

            
              5.5
              2.4
              3.7
              1.0
              versicolor

            
              5.8
              2.7
              3.9
              1.2
              versicolor

            
              6.0
              2.7
              5.1
              1.6
              versicolor

            
              5.4
              3.0
              4.5
              1.5
              versicolor

            
              6.0
              3.4
              4.5
              1.6
              versicolor

            
              6.7
              3.1
              4.7
              1.5
              versicolor

            
              6.3
              2.3
              4.4
              1.3
              versicolor

            
              5.6
              3.0
              4.1
              1.3
              versicolor

            
              5.5
              2.5
              4.0
              1.3
              versicolor

            
              5.5
              2.6
              4.4
              1.2
              versicolor

            
              6.1
              3.0
              4.6
              1.4
              versicolor

            
              5.8
              2.6
              4.0
              1.2
              versicolor

            
              5.0
              2.3
              3.3
              1.0
              versicolor

            
              5.6
              2.7
              4.2
              1.3
              versicolor

            
              5.7
              3.0
              4.2
              1.2
              versicolor

            
              5.7
              2.9
              4.2
              1.3
              versicolor

            
              6.2
              2.9
              4.3
              1.3
              versicolor

            
              5.1
              2.5
              3.0
              1.1
              versicolor

            
              5.7
              2.8
              4.1
              1.3
              versicolor

            
              6.3
              3.3
              6.0
              2.5
              virginica

            
              5.8
              2.7
              5.1
              1.9
              virginica

            
              7.1
              3.0
              5.9
              2.1
              virginica

            
              6.3
              2.9
              5.6
              1.8
              virginica

            
              6.5
              3.0
              5.8
              2.2
              virginica

            
              7.6
              3.0
              6.6
              2.1
              virginica

            
              4.9
              2.5
              4.5
              1.7
              virginica

            
              7.3
              2.9
              6.3
              1.8
              virginica

            
              6.7
              2.5
              5.8
              1.8
              virginica

            
              7.2
              3.6
              6.1
              2.5
              virginica

            
              6.5
              3.2
              5.1
              2.0
              virginica

            
              6.4
              2.7
              5.3
              1.9
              virginica

            
              6.8
              3.0
              5.5
              2.1
              virginica

            
              5.7
              2.5
              5.0
              2.0
              virginica

            
              5.8
              2.8
              5.1
              2.4
              virginica

            
              6.4
              3.2
              5.3
              2.3
              virginica

            
              6.5
              3.0
              5.5
              1.8
              virginica

            
              7.7
              3.8
              6.7
              2.2
              virginica

            
              7.7
              2.6
              6.9
              2.3
              virginica

            
              6.0
              2.2
              5.0
              1.5
              virginica

            
              6.9
              3.2
              5.7
              2.3
              virginica

            
              5.6
              2.8
              4.9
              2.0
              virginica

            
              7.7
              2.8
              6.7
              2.0
              virginica

            
              6.3
              2.7
              4.9
              1.8
              virginica

            
              6.7
              3.3
              5.7
              2.1
              virginica

            
              7.2
              3.2
              6.0
              1.8
              virginica

            
              6.2
              2.8
              4.8
              1.8
              virginica

            
              6.1
              3.0
              4.9
              1.8
              virginica

            
              6.4
              2.8
              5.6
              2.1
              virginica

            
              7.2
              3.0
              5.8
              1.6
              virginica

            
              7.4
              2.8
              6.1
              1.9
              virginica

            
              7.9
              3.8
              6.4
              2.0
              virginica

            
              6.4
              2.8
              5.6
              2.2
              virginica

            
              6.3
              2.8
              5.1
              1.5
              virginica

            
              6.1
              2.6
              5.6
              1.4
              virginica

            
              7.7
              3.0
              6.1
              2.3
              virginica

            
              6.3
              3.4
              5.6
              2.4
              virginica

            
              6.4
              3.1
              5.5
              1.8
              virginica

            
              6.0
              3.0
              4.8
              1.8
              virginica

            
              6.9
              3.1
              5.4
              2.1
              virginica

            
              6.7
              3.1
              5.6
              2.4
              virginica

            
              6.9
              3.1
              5.1
              2.3
              virginica

            
              5.8
              2.7
              5.1
              1.9
              virginica

            
              6.8
              3.2
              5.9
              2.3
              virginica

            
              6.7
              3.3
              5.7
              2.5
              virginica

            
              6.7
              3.0
              5.2
              2.3
              virginica

            
              6.3
              2.5
              5.0
              1.9
              virginica

            
              6.5
              3.0
              5.2
              2.0
              virginica

            
              6.2
              3.4
              5.4
              2.3
              virginica

            
              5.9
              3.0
              5.1
              1.8
              virginica

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

.overlay {
  fill: none;
  pointer-events: all;
}

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

.dot {
  stroke: none;
}

.dot.selected {
  stroke: #000000;
  stroke-width: 2px;
}

a {
  color: #5BBEAA;
}

.extent {
  fill: #000;
  fill-opacity: .125;
  stroke: #fff;
}


</style>
<body>
  <a class="btn" href="javascript:void(0);" onclick="get_selection();">Get Selection</a>
  <a class="btn" href="javascript:void(0);" onclick="clear_selection();">Clear Selection</a>
  <!-- // <script src="d3.v3.min.js"></script> -->
  <script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script>
  <script>
  var margin = {top: 20, right: 20, bottom: 30, left: 40},
  width = 800 - margin.left - margin.right,
  height = 400 - margin.top - margin.bottom;

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

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

  var color = d3.scale.category10();

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

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

  var svg = d3.select("body")
  .append("svg")
  .attr("width", width + margin.left + margin.right)
  .attr("height", height + margin.top + margin.bottom);

  var shiftKey;

  var rect,
  node;

  svg = svg.append("g")
  .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

  var selection = [];

  function get_selection(){
    selection = [];
    node.each(function(d) {
      if (d.selected) {
        selection.push(d);
      }
    });
    console.log(selection);
  }

  function clear_selection() {
    node.classed('selected', function (d) { return d.selected = false; })
  }

  d3.tsv("data.tsv", function(error, data) {
    data.forEach(function(d) {
      d.sepalLength = +d.sepalLength;
      d.sepalWidth = +d.sepalWidth;
      if (d.sepalWidth == 3) {
        d.selected = true;
      }
    });

    x.domain(d3.extent(data, function(d) { return d.sepalWidth; })).nice();
    y.domain(d3.extent(data, function(d) { return d.sepalLength; })).nice();

    svg = svg.call(d3.behavior.zoom().x(x).y(y).on("zoom", zoom));

    svg.append("g")
    .attr("class", "x axis")
    .attr("transform", "translate(0," + height + ")")
    .call(xAxis)
    .append("text")
    .attr("class", "label")
    .attr("x", width)
    .attr("y", -6)
    .style("text-anchor", "end")
    .text("Sepal Width (cm)");

    svg.append("g")
    .attr("class", "y axis")
    .call(yAxis)
    .append("text")
    .attr("class", "label")
    .attr("transform", "rotate(-90)")
    .attr("y", 6)
    .attr("dy", ".71em")
    .style("text-anchor", "end")
    .text("Sepal Length (cm)")


    var brush = svg.append("g")
    .datum(function() { return {selected: false, previouslySelected: false}; })
    .attr("class", "brush")
    .call(d3.svg.brush()
      .x(d3.scale.identity().domain([0, width]))
      .y(d3.scale.identity().domain([0, height]))
      .on("brushstart", function(d) {
        console.log('brushstart');
        node.each(function(d) { d.previouslySelected = shiftKey && d.selected; });
        if (!shiftKey) {
          d3.event.target.clear();
          d3.select(this).call(d3.event.target);
        }
      })
      .on("brush", function() {
        if (shiftKey) {
          console.log('shiftKey', shiftKey);
          var extent = d3.event.target.extent();
          node.classed("selected", function(d) {
            return d.selected = d.previouslySelected ^
            (extent[0][0] <= x(d.sepalWidth) && x(d.sepalWidth) < extent[1][0]
              && extent[0][1] <= y(d.sepalLength) && y(d.sepalLength) < extent[1][1]);
          });
        } else {
          d3.event.target.clear();
          d3.select(this).call(d3.event.target);
        }
      })
      .on("brushend", function() {
        d3.event.target.clear();
        d3.select(this).call(d3.event.target);
      }));

  function zoom() {
    if (shiftKey) {
      console.log('zoom shiftKey');
      return;
      console.log('zoom wtf');
    }
    console.log('zoom');
    node.attr("cx", function(d) { return x(d.sepalWidth); })
    .attr("cy", function(d) { return y(d.sepalLength); });
    d3.select('.x.axis').call(xAxis);
    d3.select('.y.axis').call(yAxis);
  }

  rect = svg.append('rect')
  .attr('pointer-events', 'all')
  .attr('width', width)
  .attr('height', height)
  .style('fill', 'none');

  node = svg.selectAll(".dot")
  .data(data)
  .enter().append("circle")
  .attr("class", "dot")
  .attr("r", function(d) { return d.selected ? 5 : 6; })
  .attr("cx", function(d) { return x(d.sepalWidth); })
  .attr("cy", function(d) { return y(d.sepalLength); })
  .style("fill", function(d) { return color(d.species); })
  .on("mousedown", function(d) {
    if (shiftKey) {
      d3.select(this).classed("selected", d.selected = !d.selected);
    } else {
      node.classed("selected", function(p) {
        return p.selected = d === p;
      });
    }
  });

  node.classed('selected', function (d) {return d.selected;})

  var legend = svg.selectAll(".legend")
  .data(color.domain())
  .enter().append("g")
  .attr("class", "legend")
  .attr("transform", function(d, i) { return "translate(0," + i * 20 + ")"; });

  legend.append("rect")
  .attr("x", width - 18)
  .attr("width", 18)
  .attr("height", 18)
  .style("fill", color);

  legend.append("text")
  .attr("x", width - 24)
  .attr("y", 9)
  .attr("dy", ".35em")
  .style("text-anchor", "end")
  .text(function(d) { return d; });

  d3.select(window).on("keydown", function() {
    shiftKey = d3.event.shiftKey;
    if (shiftKey) {
      rect = rect.attr('pointer-events', 'none');
    } else {
      rect = rect.attr('pointer-events', 'all');
    }
  });

  d3.select(window).on("keyup", function() {
    shiftKey = d3.event.shiftKey;
    if (shiftKey) {
      rect = rect.attr('pointer-events', 'none');
    } else {
      rect = rect.attr('pointer-events', 'all');
    }
  });

});

</script>
sepalLength	sepalWidth	petalLength	petalWidth	species
5.1	3.5	1.4	0.2	setosa
4.9	3.0	1.4	0.2	setosa
4.7	3.2	1.3	0.2	setosa
4.6	3.1	1.5	0.2	setosa
5.0	3.6	1.4	0.2	setosa
5.4	3.9	1.7	0.4	setosa
4.6	3.4	1.4	0.3	setosa
5.0	3.4	1.5	0.2	setosa
4.4	2.9	1.4	0.2	setosa
4.9	3.1	1.5	0.1	setosa
5.4	3.7	1.5	0.2	setosa
4.8	3.4	1.6	0.2	setosa
4.8	3.0	1.4	0.1	setosa
4.3	3.0	1.1	0.1	setosa
5.8	4.0	1.2	0.2	setosa
5.7	4.4	1.5	0.4	setosa
5.4	3.9	1.3	0.4	setosa
5.1	3.5	1.4	0.3	setosa
5.7	3.8	1.7	0.3	setosa
5.1	3.8	1.5	0.3	setosa
5.4	3.4	1.7	0.2	setosa
5.1	3.7	1.5	0.4	setosa
4.6	3.6	1.0	0.2	setosa
5.1	3.3	1.7	0.5	setosa
4.8	3.4	1.9	0.2	setosa
5.0	3.0	1.6	0.2	setosa
5.0	3.4	1.6	0.4	setosa
5.2	3.5	1.5	0.2	setosa
5.2	3.4	1.4	0.2	setosa
4.7	3.2	1.6	0.2	setosa
4.8	3.1	1.6	0.2	setosa
5.4	3.4	1.5	0.4	setosa
5.2	4.1	1.5	0.1	setosa
5.5	4.2	1.4	0.2	setosa
4.9	3.1	1.5	0.2	setosa
5.0	3.2	1.2	0.2	setosa
5.5	3.5	1.3	0.2	setosa
4.9	3.6	1.4	0.1	setosa
4.4	3.0	1.3	0.2	setosa
5.1	3.4	1.5	0.2	setosa
5.0	3.5	1.3	0.3	setosa
4.5	2.3	1.3	0.3	setosa
4.4	3.2	1.3	0.2	setosa
5.0	3.5	1.6	0.6	setosa
5.1	3.8	1.9	0.4	setosa
4.8	3.0	1.4	0.3	setosa
5.1	3.8	1.6	0.2	setosa
4.6	3.2	1.4	0.2	setosa
5.3	3.7	1.5	0.2	setosa
5.0	3.3	1.4	0.2	setosa
7.0	3.2	4.7	1.4	versicolor
6.4	3.2	4.5	1.5	versicolor
6.9	3.1	4.9	1.5	versicolor
5.5	2.3	4.0	1.3	versicolor
6.5	2.8	4.6	1.5	versicolor
5.7	2.8	4.5	1.3	versicolor
6.3	3.3	4.7	1.6	versicolor
4.9	2.4	3.3	1.0	versicolor
6.6	2.9	4.6	1.3	versicolor
5.2	2.7	3.9	1.4	versicolor
5.0	2.0	3.5	1.0	versicolor
5.9	3.0	4.2	1.5	versicolor
6.0	2.2	4.0	1.0	versicolor
6.1	2.9	4.7	1.4	versicolor
5.6	2.9	3.6	1.3	versicolor
6.7	3.1	4.4	1.4	versicolor
5.6	3.0	4.5	1.5	versicolor
5.8	2.7	4.1	1.0	versicolor
6.2	2.2	4.5	1.5	versicolor
5.6	2.5	3.9	1.1	versicolor
5.9	3.2	4.8	1.8	versicolor
6.1	2.8	4.0	1.3	versicolor
6.3	2.5	4.9	1.5	versicolor
6.1	2.8	4.7	1.2	versicolor
6.4	2.9	4.3	1.3	versicolor
6.6	3.0	4.4	1.4	versicolor
6.8	2.8	4.8	1.4	versicolor
6.7	3.0	5.0	1.7	versicolor
6.0	2.9	4.5	1.5	versicolor
5.7	2.6	3.5	1.0	versicolor
5.5	2.4	3.8	1.1	versicolor
5.5	2.4	3.7	1.0	versicolor
5.8	2.7	3.9	1.2	versicolor
6.0	2.7	5.1	1.6	versicolor
5.4	3.0	4.5	1.5	versicolor
6.0	3.4	4.5	1.6	versicolor
6.7	3.1	4.7	1.5	versicolor
6.3	2.3	4.4	1.3	versicolor
5.6	3.0	4.1	1.3	versicolor
5.5	2.5	4.0	1.3	versicolor
5.5	2.6	4.4	1.2	versicolor
6.1	3.0	4.6	1.4	versicolor
5.8	2.6	4.0	1.2	versicolor
5.0	2.3	3.3	1.0	versicolor
5.6	2.7	4.2	1.3	versicolor
5.7	3.0	4.2	1.2	versicolor
5.7	2.9	4.2	1.3	versicolor
6.2	2.9	4.3	1.3	versicolor
5.1	2.5	3.0	1.1	versicolor
5.7	2.8	4.1	1.3	versicolor
6.3	3.3	6.0	2.5	virginica
5.8	2.7	5.1	1.9	virginica
7.1	3.0	5.9	2.1	virginica
6.3	2.9	5.6	1.8	virginica
6.5	3.0	5.8	2.2	virginica
7.6	3.0	6.6	2.1	virginica
4.9	2.5	4.5	1.7	virginica
7.3	2.9	6.3	1.8	virginica
6.7	2.5	5.8	1.8	virginica
7.2	3.6	6.1	2.5	virginica
6.5	3.2	5.1	2.0	virginica
6.4	2.7	5.3	1.9	virginica
6.8	3.0	5.5	2.1	virginica
5.7	2.5	5.0	2.0	virginica
5.8	2.8	5.1	2.4	virginica
6.4	3.2	5.3	2.3	virginica
6.5	3.0	5.5	1.8	virginica
7.7	3.8	6.7	2.2	virginica
7.7	2.6	6.9	2.3	virginica
6.0	2.2	5.0	1.5	virginica
6.9	3.2	5.7	2.3	virginica
5.6	2.8	4.9	2.0	virginica
7.7	2.8	6.7	2.0	virginica
6.3	2.7	4.9	1.8	virginica
6.7	3.3	5.7	2.1	virginica
7.2	3.2	6.0	1.8	virginica
6.2	2.8	4.8	1.8	virginica
6.1	3.0	4.9	1.8	virginica
6.4	2.8	5.6	2.1	virginica
7.2	3.0	5.8	1.6	virginica
7.4	2.8	6.1	1.9	virginica
7.9	3.8	6.4	2.0	virginica
6.4	2.8	5.6	2.2	virginica
6.3	2.8	5.1	1.5	virginica
6.1	2.6	5.6	1.4	virginica
7.7	3.0	6.1	2.3	virginica
6.3	3.4	5.6	2.4	virginica
6.4	3.1	5.5	1.8	virginica
6.0	3.0	4.8	1.8	virginica
6.9	3.1	5.4	2.1	virginica
6.7	3.1	5.6	2.4	virginica
6.9	3.1	5.1	2.3	virginica
5.8	2.7	5.1	1.9	virginica
6.8	3.2	5.9	2.3	virginica
6.7	3.3	5.7	2.5	virginica
6.7	3.0	5.2	2.3	virginica
6.3	2.5	5.0	1.9	virginica
6.5	3.0	5.2	2.0	virginica
6.2	3.4	5.4	2.3	virginica
5.9	3.0	5.1	1.8	virginica
	<!DOCTYPE html>
	<meta charset="utf-8">
	<style>

	.overlay {
	fill: none;
	pointer-events: all;
	}

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

	.dot {
	stroke: none;
	}

	.dot.selected {
	stroke: #000000;
	stroke-width: 2px;
	}

	a {
	color: #5BBEAA;
	}

	.extent {
	fill: #000;
	fill-opacity: .125;
	stroke: #fff;
	}


	</style>
	<body>
	<a class="btn" href="javascript:void(0);" onclick="get_selection();">Get Selection</a>
	<a class="btn" href="javascript:void(0);" onclick="clear_selection();">Clear Selection</a>
	<!-- // <script src="d3.v3.min.js"></script> -->
	<script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script>
	<script>
	var margin = {top: 20, right: 20, bottom: 30, left: 40},
	width = 800 - margin.left - margin.right,
	height = 400 - margin.top - margin.bottom;

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

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

	var color = d3.scale.category10();

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

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

	var svg = d3.select("body")
	.append("svg")
	.attr("width", width + margin.left + margin.right)
	.attr("height", height + margin.top + margin.bottom);

	var shiftKey;

	var rect,
	node;

	svg = svg.append("g")
	.attr("transform", "translate(" + margin.left + "," + margin.top + ")");

	var selection = [];

	function get_selection(){
	selection = [];
	node.each(function(d) {
	if (d.selected) {
	selection.push(d);
	}
	});
	console.log(selection);
	}

	function clear_selection() {
	node.classed('selected', function (d) { return d.selected = false; })
	}

	d3.tsv("data.tsv", function(error, data) {
	data.forEach(function(d) {
	d.sepalLength = +d.sepalLength;
	d.sepalWidth = +d.sepalWidth;
	if (d.sepalWidth == 3) {
	d.selected = true;
	}
	});

	x.domain(d3.extent(data, function(d) { return d.sepalWidth; })).nice();
	y.domain(d3.extent(data, function(d) { return d.sepalLength; })).nice();

	svg = svg.call(d3.behavior.zoom().x(x).y(y).on("zoom", zoom));

	svg.append("g")
	.attr("class", "x axis")
	.attr("transform", "translate(0," + height + ")")
	.call(xAxis)
	.append("text")
	.attr("class", "label")
	.attr("x", width)
	.attr("y", -6)
	.style("text-anchor", "end")
	.text("Sepal Width (cm)");

	svg.append("g")
	.attr("class", "y axis")
	.call(yAxis)
	.append("text")
	.attr("class", "label")
	.attr("transform", "rotate(-90)")
	.attr("y", 6)
	.attr("dy", ".71em")
	.style("text-anchor", "end")
	.text("Sepal Length (cm)")



	var brush = svg.append("g")
	.datum(function() { return {selected: false, previouslySelected: false}; })
	.attr("class", "brush")
	.call(d3.svg.brush()
	.x(d3.scale.identity().domain([0, width]))
	.y(d3.scale.identity().domain([0, height]))
	.on("brushstart", function(d) {
	console.log('brushstart');
	node.each(function(d) { d.previouslySelected = shiftKey && d.selected; });
	if (!shiftKey) {
	d3.event.target.clear();
	d3.select(this).call(d3.event.target);
	}
	})
	.on("brush", function() {
	if (shiftKey) {
	console.log('shiftKey', shiftKey);
	var extent = d3.event.target.extent();
	node.classed("selected", function(d) {
	return d.selected = d.previouslySelected ^
	(extent[0][0] <= x(d.sepalWidth) && x(d.sepalWidth) < extent[1][0]
	&& extent[0][1] <= y(d.sepalLength) && y(d.sepalLength) < extent[1][1]);
	});
	} else {
	d3.event.target.clear();
	d3.select(this).call(d3.event.target);
	}
	})
	.on("brushend", function() {
	d3.event.target.clear();
	d3.select(this).call(d3.event.target);
	}));

	function zoom() {
	if (shiftKey) {
	console.log('zoom shiftKey');
	return;
	console.log('zoom wtf');
	}
	console.log('zoom');
	node.attr("cx", function(d) { return x(d.sepalWidth); })
	.attr("cy", function(d) { return y(d.sepalLength); });
	d3.select('.x.axis').call(xAxis);
	d3.select('.y.axis').call(yAxis);
	}

	rect = svg.append('rect')
	.attr('pointer-events', 'all')
	.attr('width', width)
	.attr('height', height)
	.style('fill', 'none');

	node = svg.selectAll(".dot")
	.data(data)
	.enter().append("circle")
	.attr("class", "dot")
	.attr("r", function(d) { return d.selected ? 5 : 6; })
	.attr("cx", function(d) { return x(d.sepalWidth); })
	.attr("cy", function(d) { return y(d.sepalLength); })
	.style("fill", function(d) { return color(d.species); })
	.on("mousedown", function(d) {
	if (shiftKey) {
	d3.select(this).classed("selected", d.selected = !d.selected);
	} else {
	node.classed("selected", function(p) {
	return p.selected = d === p;
	});
	}
	});

	node.classed('selected', function (d) {return d.selected;})

	var legend = svg.selectAll(".legend")
	.data(color.domain())
	.enter().append("g")
	.attr("class", "legend")
	.attr("transform", function(d, i) { return "translate(0," + i * 20 + ")"; });

	legend.append("rect")
	.attr("x", width - 18)
	.attr("width", 18)
	.attr("height", 18)
	.style("fill", color);

	legend.append("text")
	.attr("x", width - 24)
	.attr("y", 9)
	.attr("dy", ".35em")
	.style("text-anchor", "end")
	.text(function(d) { return d; });

	d3.select(window).on("keydown", function() {
	shiftKey = d3.event.shiftKey;
	if (shiftKey) {
	rect = rect.attr('pointer-events', 'none');
	} else {
	rect = rect.attr('pointer-events', 'all');
	}
	});

	d3.select(window).on("keyup", function() {
	shiftKey = d3.event.shiftKey;
	if (shiftKey) {
	rect = rect.attr('pointer-events', 'none');
	} else {
	rect = rect.attr('pointer-events', 'all');
	}
	});

	});

	</script>