D3 Examples - Scatterplot With Inspector

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
body {
  font: 10px sans-serif;
}
  
.bar rect {
  fill: steelblue;
  shape-rendering: crispEdges;
}
​
.bar text {
  fill: #fff;
}
​
.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}
​
.dot {
  stroke: #000;
}
  
.inspectorlabel {
    font-size: 14px;
}
​
rect.selectionWindow {
 
  stroke: darkblue;
  stroke-opacity: 0.8;
  stroke-dasharray: 8px;
  fill: transparent;
  
}
​
svg {
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none; 
}
  
  
  
  
</style>
<body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
<script>
​
var attrToHistogram = 'petalLength';
var inspectorHeightWithMargin = 150;  
var margin = {top: 20, right: 20, bottom: 30, left: 40},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom - inspectorHeightWithMargin;
​
var inspectorHeight = inspectorHeightWithMargin - 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 rawsvg = d3.select("body").append("svg");
​
var selectedDots = [];
  
var svg = rawsvg
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
​
var inspectorSvg = d3.select("body").append("svg")
        .attr("width", width + margin.left + margin.right)
        .attr("height", inspectorHeight + margin.top + margin.bottom)
    .append("g")
        .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
​
var normalizeP = function (p) {
    p[0] = p[0] - margin.left;
  p[1] = p[1] - margin.top;
  return p;
}
  
var setupDraggableWindow = function (data) {
  
    rawsvg.on("mousedown", function () {
    
    console.log('mousedown');
    var p = d3.mouse(this);
    p = normalizeP(p);
    svg.append("rect")
        .attr({
        rx: 6,
        ry: 6,
        class: "selectionWindow",
        x: p[0],
        y: p[1],
        width: 0,
        height: 0
        });
  }).on("mousemove", function () {
        var s = svg.select("rect.selectionWindow");
    
    if (!s.empty()) {
        var p = d3.mouse(this);
      p = normalizeP(p);
      var d = {
        x: parseInt(s.attr("x"), 10),
        y: parseInt(s.attr("y"), 10),
        width: parseInt(s.attr("width"), 10),
        height: parseInt(s.attr("height"), 10)
      };
      var move = {
        x: p[0] - d.x,
        y: p[1] - d.y
      };
      
      if( move.x < 1 || (move.x*2<d.width)) {
        d.x = p[0];
        d.width -= move.x;
      } else {
        d.width = move.x;       
      }
​
      if( move.y < 1 || (move.y*2<d.height)) {
        d.y = p[1];
        d.height -= move.y;
      } else {
        d.height = move.y;       
      }
      
      s.attr(d);
      
      var newSelectedDots = [];
      // Add remove selected items from some global.
      d3.selectAll('circle.dot').each( function (da, i) {
                var dataX = x(da.sepalWidth);
        var dataY = y(da.sepalLength);
                
                if (dataX >= d.x && dataX <= d.x + d.width && dataY >= d.y && dataY <= d.y + d.height) {
         
          newSelectedDots.push(da);
        }
        
      });
      renderInspectorHistogram(newSelectedDots);
      
    }
​
  }).on('mouseup', function () {
        svg.selectAll( "rect.selectionWindow").remove();
    renderInspectorHistogram([]);
  });
  
};
  
  
var setupScatterPlot = function (data) {
  
  x.domain(d3.extent(data, function(d) { return d.sepalWidth; })).nice();
  y.domain(d3.extent(data, function(d) { return d.sepalLength; })).nice();
​
  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)")
​
  svg.selectAll(".dot")
      .data(data)
    .enter().append("circle")
      .attr("class", "dot")
      .attr("r", 3.5)
      .attr("cx", function(d) { return x(d.sepalWidth); })
      .attr("cy", function(d) { return y(d.sepalLength); })
      .style("fill", function(d) { return color(d.species); });
​
  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; });
} 
​
function renderInspectorHistogram (inputData) {
  
  var text = inputData ? attrToHistogram + ':' : 'Click and drag to select a region.';
  if (inputData && inputData.length === 1) { 
    text = 'layout.histogram() seems to be broken with 1 element :('; 
  }
  console.log('text: ', text);
  inspectorSvg.selectAll(".inspectorlabel").remove();
  inspectorSvg.append("text")
      .attr("class", "inspectorlabel")
      .attr("x", 10)
      .attr("y", -10)
      .text(text);
  
  if (!inputData || inputData.length < 2) {
    return; 
  }
  
  var subsetData = inputData;
  var values = subsetData.map(function (data) { return +data[attrToHistogram]; });
  
  inspectorSvg.selectAll(".bar").remove();
  inspectorSvg.selectAll(".axis").remove();
 
  var formatCount = d3.format(",.0f");
  var extent = d3.extent(values);
  
  var xForHistogram = d3.scale.linear()
        .domain(extent)
        .range([0, width]);
​
  var xForBarWidth = d3.scale.linear()
        .domain([0, extent[1] - extent[0]])
      .range([0, width]);
  
  var x = d3.scale.linear()
      .domain([0, 1])
      .range([0, width]);
​
  // Generate a histogram using twenty uniformly-spaced bins.
  var data = d3.layout.histogram()
      .bins(xForHistogram.ticks(20))
      (values);
  
  
  var y = d3.scale.linear()
      .domain([0, d3.max(data, function(d) { return d.y; })])
      .range([inspectorHeight, 0]);
​
  var xAxis = d3.svg.axis()
      .scale(xForHistogram)
      .orient("bottom");
​
  var bar = inspectorSvg.selectAll(".bar")
      .data(data)
    .enter().append("g")
      .attr("class", "bar")
      .attr("transform", function(d) { return "translate(" + xForHistogram(d.x) + "," + y(d.y) + ")"; });
​
  bar.append("rect")
      .attr("x", 1)
      .attr("width", xForBarWidth(data[0].dx) - 1)
      .attr("height", function(d) { return inspectorHeight - y(d.y); });
​
  bar.append("text")
      .attr("dy", ".75em")
      .attr("y", 6)
      .attr("x", xForBarWidth(data[0].dx) / 2)
      .attr("text-anchor", "middle")
      .text(function(d) { return formatCount(d.y); });
​
  inspectorSvg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + inspectorHeight + ")")
      .call(xAxis);
  
}
​
  
d3.tsv("data.tsv", function(error, data) {
  if (error) throw error;
​
  data.forEach(function(d) {
    d.sepalLength = +d.sepalLength;
    d.sepalWidth = +d.sepalWidth;
  });
​
  setupScatterPlot(data);
  setupDraggableWindow(data);
  renderInspectorHistogram();
​
});
​
</script>
​
    