D3 Examples - Brush & Zoom

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
.area {
  fill: steelblue;
/*   fill: none; */
  clip-path: url(#clip);
}
  
 .overlay {
  fill: none;
  pointer-events: all;
}
  
  .focus .area{
    fill: none;
  }
  
/*   .circ circle {
  fill: none;
  stroke: steelblue;
} */
  
.line {
  fill: none;
  clip-path: url(#clip);
}  
​
.zoom {
  cursor: move;
  fill: none;
  pointer-events: all;
}
​
</style>
<svg width="960" height="500"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
​
var svg = d3.select("svg"),
    margin = {top: 20, right: 100, bottom: 110, left: 40},
    margin2 = {top: 430, right: 20, bottom: 30, left: 40},
    width = +svg.attr("width") - margin.left - margin.right,
    height = +svg.attr("height") - margin.top - margin.bottom,
    height2 = +svg.attr("height") - margin2.top - margin2.bottom;
​
// var parseDate = d3.timeParse("%b %Y"),
  var parseTime = d3.timeParse("%Y%m%d"),
    bisectDate = d3.bisector(function(d) { return d.date; }).left,
    bisect = d3.bisector(function(d) { return parseTime(d.x); }).left;
​
var x = d3.scaleTime().range([0, width]),
    x2 = d3.scaleTime().range([0, width]),
    x3 = d3.scaleLinear().range([0,width]),
    y = d3.scaleLinear().range([height, 0]),
    y2 = d3.scaleLinear().range([height2, 0])
        z = d3.scaleOrdinal(d3.schemeCategory10);
​
var xAxis = d3.axisBottom(x),
    xAxis2 = d3.axisBottom(x2),
    yAxis = d3.axisLeft(y);
​
​
​
var zoom = d3.zoom()
    .scaleExtent([1, Infinity])
    .translateExtent([[0, 0], [width, height]])
    .extent([[0, 0], [width, height]])
    .on("zoom", zoomed);
​
var area = d3.area()
    .curve(d3.curveMonotoneX)
    .x(function(d) { return x(d.date); })
    .y0(height)
    .y1(function(d) { return y(d.price); });
  
// var line = d3.line()
// //       .curve(d3.curveMonotoneX)
//     .x(function(d) {
//       return x(d.date);
//     })
//     .y(function(d) {
//       return y(d.price);
//     });
  
  
var line = d3.line()
.x(function(d) {
  return x(parseTime(d.x));
})
.y(function(d) {
  return y(d.y);
});  
​
// var area2 = d3.area()
//     .curve(d3.curveMonotoneX)
//     .x(function(d) { return x2(d.date); })
//     .y0(height2)
//     .y1(function(d) { return y2(d.price); });
​
  var area2 = d3.area()
    .curve(d3.curveMonotoneX)
    .x(function(d) { return x2(parseTime(d.x)); })
    .y0(height2)
    .y1(function(d) { return y2(d.y); });
​
  
svg.append("defs").append("clipPath")
    .attr("id", "clip")
  .append("rect")
    .attr("width", width)
    .attr("height", height);
​
var focus = svg.append("g")
    .attr("class", "focus")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
​
var context = svg.append("g")
    .attr("class", "context")
    .attr("transform", "translate(" + margin2.left + "," + margin2.top + ")");
​
  d3.json("temperature3.json", function(error, data) {
//     console.log(data);
// d3.csv("sp500.csv", type, function(error, data) {
  if (error) throw error;
​
//   x.domain(d3.extent(data, function(d) { return d.date; }));
//   y.domain([0, d3.max(data, function(d) { return d.price; })]);
    
x.domain(d3.extent(data['0'].values, function(c){return parseTime(c.x)}));
  y.domain([
    d3.min(data, function(c) { return d3.min(c.values, function(d) { return d.y; }); }),
    d3.max(data, function(c) { return d3.max(c.values, function(d) { return d.y; }); })
  ]);    
  x2.domain(x.domain());
  y2.domain(y.domain());
    
    
  x3.domain([0, data[0].values.length - 1]);
    
  z.domain(data, function(c) { return c.id; });
​
    
    var brush = d3.brushX()
    .extent([[0, 0], [width, height2]])
    .on("brush end", brushed);
    
    
//   focus.append("path")
//       .datum(data)
//       .attr("class", "area")
//       .attr("d", area);
  
//   focus.append("path")
//            .datum(data)
//              .attr("class", "line")
//              .attr("d", line)
//              .style("stroke", "black");
​
  focus.append("g")
      .attr("class", "axis axis--x")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis);
​
  focus.append("g")
      .attr("class", "axis axis--y")
      .call(yAxis);
    
    
var city = focus.selectAll(".city")
    .data(data)
    .enter().append("g")
    .attr("class", "city");
​
  city.append("path")
      .attr("class", "line")
      .attr("d", function(d) { return line(d.values); })
      .style("stroke", function(d) { return z(d.id); });
​
  city.append("text")
      .datum(function(d) { return {id: d.id, value: d.values[d.values.length - 1]}; })
      .attr("transform", function(d) { return "translate(" + x(parseTime(d.value.x)) + "," + y(d.value.y) + ")"; })
      .attr("x", 3)
      .attr("dy", "0.35em")
      .style("font", "10px sans-serif")
      .text(function(d) { return d.id; });    
    
    
​
  context.append("path")
      .data(data)
      .attr("class", "area")
//       .attr("d", area2)
        .attr('d', function(d) { return area2(d.values); });
​
  context.append("g")
      .attr("class", "axis axis--x")
      .attr("transform", "translate(0," + height2 + ")")
      .call(xAxis2);
​
  context.append("g")
      .attr("class", "brush")
      .call(brush)
      .call(brush.move, x.range());
​
//   svg.append("rect")
//       .attr("class", "zoom")
//       .attr("width", width)
//       .attr("height", height)
//       .attr("transform", "translate(" + margin.left + "," + margin.top + ")")
//       .call(zoom);
  
  
  var circ = svg.append("g")
      .attr("class", "circ")
      .style("display", "none");
​
//   circ.append("circle")
//          .attr("transform", "translate(" + margin.left + "," + margin.top + ")")
//       .attr("r", 2.5)
//          .style("fill", "black");
​
//   circ.append("text")
//          .attr("transform", "translate(" + margin.left + "," + margin.top + ")")
//       .attr("x", 9)
//       .attr("dy", ".35em");
    
    
    
for(var i=0;i<data.length;i++){
              circ.append("g")
                .attr("class", "circ"+i)
                .append("circle")
                .style("stroke",  z(data[i].id))
                .style("fill", z(data[i].id))
                .attr("transform", "translate(" + margin.left  + "," + margin.top + ")")
                .attr("r", 2);
              svg.select(".circ"+i)
                .append("text")
                .attr("transform", "translate(" + margin.left  + "," + margin.top + ")")
                .attr("x", 9)
                .attr("dy", ".35em");
          }    
  
  
​
svg.append("rect")
          .attr("class", "overlay")
          .attr("width", width)
          .attr("height", height)
            .attr("transform", "translate(" + margin.left + "," + margin.top + ")")
          .on("mouseover", function() { circ.style("display", null); })
          .on("mouseout", function() { circ.style("display", "none"); })
          .on("mousemove",  mousemove);
  
 
  
//   function mousemove() {
// //   console.log("in mosemove");
//     var x0 = x.invert(d3.mouse(this)[0]),
//         i = bisectDate(data, x0, 1),
//         d0 = data[i - 1],
//         d1 = data[i],
//         d = x0 - d0.date > d1.date - x0 ? d1 : d0;
//     circ.attr("transform", "translate(" + x(d.date) + "," + y(d.price) + ")");
//     circ.select("text").text(d.price);
//   } 
    
    
    function mousemove() {
              var x0 = x.invert(d3.mouse(this)[0]);
              var series = data.map(function(e) {
                    var i = bisect(e.values, x0, 1),
                        d0 = e.values[i - 1],
                        d1 = e.values[i];
                    return x0 - d0.x > d1.x - x0 ? d1 : d0;
                  });
//     console.log(series);
              for(var i=0; i<series.length;i++){
                var selectedFocus = svg.selectAll(".circ"+i);
                selectedFocus.attr("transform", "translate(" + x(parseTime(series[i].x)) + "," + y(series[i].y) + ")");
                selectedFocus.select("text").text(series[i].y);
              }
            }
  
 function brushed() {
  if (d3.event.sourceEvent && d3.event.sourceEvent.type === "zoom") return; // ignore brush-by-zoom
  var s = d3.event.selection || x2.range();
//    console.log(s[0],s[1], Math.floor(x3.invert(s[1])));
  x.domain(s.map(x2.invert, x2));
//   focus.select(".area").attr("d", area);
//   focus.select(".line").attr("d", line);
        focus.selectAll(".line").attr("d", function(d) { return line(d.values); });
//   city.select(".line").attr("d", function(d) { return line(d.values); });
   city.select("text")
        .data(data)
      .datum(function(d) { return {id: d.id, value: d.values[Math.floor(x3.invert(s[1]))]}; })
      .attr("transform", function(d) { return "translate(" + x(parseTime(d.value.x)) + "," + y(d.value.y) + ")"; });
  focus.select(".axis--x").call(xAxis);
  svg.select(".zoom").call(zoom.transform, d3.zoomIdentity
      .scale(width / (s[1] - s[0]))
      .translate(-s[0], 0));
} 
  
​
    
});
 
  
​
  
  
​
  
  
​
​
​
function zoomed() {
  if (d3.event.sourceEvent && d3.event.sourceEvent.type === "brush") return; // ignore zoom-by-brush
  var t = d3.event.transform;
  x.domain(t.rescaleX(x2).domain());
  focus.select(".area").attr("d", area);
  focus.select(".line").attr("d", line);
  focus.select(".axis--x").call(xAxis);
  context.select(".brush").call(brush.move, x.range().map(t.invertX, t));
}
​
function type(d) {
  d.date = parseDate(d.date);
  d.price = +d.price;
  return d;
}
​
</script>
​
    