D3 Examples - Globe and Satellites with Longitude Slider

Globe and Satellites with Longitude Slider
Display a zoomable Orthographic projection with countries and some locations shown. Display a longitude slider that allows the longitude to be set dynamically. The aim is to show which earth stations are visible from a satellite in geostationary orbit at the selected longitude.
Bits have been copied from several blocks
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<!DOCTYPE html>
<meta charset="utf-8">
<style>
  body {
    background: #fcfcfa;
    height: 500px;
    position: relative;
    width: 960px;
  }
  .border {
    fill: #666;
    stroke: black;
    
  }
  .clip {
    fill: #fcfcfa;    
  }
​
  .stroke {
    fill: none;
    stroke: #000;
    stroke-width: 3px;
  }
  .fill {
    fill: #ccc;
  }
  .graticule {
    fill: none;
    stroke: #777;
    stroke-width: .5;
    stroke-opacity: .5;
    vector-effect: non-scaling-stroke;
  }
  .sphere {
    fill: #7BB5FF;
  }
  .gradient {
    fill: url(#gradient);
  }
  .country {
    fill: #335533;
    fill-opacity: 0.7;
    stroke: #fff;
    stroke-width: 0.5;
    vector-effect: non-scaling-stroke;
  }
  .equator {
    stroke: red;
    stroke-width: 1px;
  }
  .cityname {
    fill-opacity: 0.8;
    fill:black;
    font-size:8px;
    font-family: "Arial", sans-serif;
    background-color: yellow;
  }
  .satellite {
    fill: blue;
  }
  .beam {
    fill: yellow; 
    fill-opacity: 0.1;
    stroke: red;
    stroke-width: 0.5;
    vector-effect: non-scaling-stroke;
    /* pointer-events: none;    ensures that mouseover countries works thru the beam */
  }
  .ticks {
    font: 10px sans-serif;
  }
​
  .track,
  .track-inset,
  .track-overlay {
    stroke-linecap: round;
  }
​
  .track {
    stroke: #000;
    stroke-opacity: 0.3;
    stroke-width: 10px;
  }
​
  .track-inset {
    stroke: #ddd;
    stroke-width: 8px;
  }
​
  .track-overlay {
    pointer-events: stroke;
    stroke-width: 50px;
    stroke: transparent;
    cursor: crosshair;
  }
​
  .handle {
    fill: #fff;
    stroke: #000;
    stroke-opacity: 0.5;
    stroke-width: 1.25px;
  }
​
  div.tooltip {
    color: #222; 
    background: #fff; 
    border-radius: 3px; 
    box-shadow: 0px 0px 2px 0px #a6a6a6; 
    padding: .2em; 
    text-shadow: #f5f5f5 0 1px 0;
    opacity: 0.9; 
    position: absolute;
  }
  .hidden {
      display: none;
  }
</style>
<div id="map"></div>
<span id="projection-menu"></span>
<script src="//d3js.org/d3.v4.min.js"></script>
<script src="//d3js.org/queue.v1.min.js"></script>
<script src="//d3js.org/d3-geo-projection.v1.min.js"></script>
<script src="//d3js.org/topojson.v2.min.js"></script>
<script>
var width = 960,
    height = 800;
var longitude = 0;
var i = 0;
var projection = d3.geoOrthographic()
    .center([0, 10])
    .scale(290)
    .rotate([longitude,0])
​
var path = d3.geoPath(projection);
var graticule = d3.geoGraticule();
var sphere = {type: "Sphere"};
  
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height)
​
var defs = svg.append("defs")
​
var filter = defs.append("filter")
  .attr("x","0")
  .attr("y","0")
  .attr("width","1")
  .attr("height","1")
  .attr("id","solid")
​
filter.append("feFlood")
  .attr("flood-color","white")
​
filter.append("feComposite")
  .attr("in","SourceGraphic")
​
var gradient = defs.append("svg:linearGradient")
  .attr("id", "gradient")
  .attr("x1", "0%")
  .attr("y1", "0%")
  .attr("fx1", "30%")
  .attr("fy1", "30%")
  .attr("x2", "100%")
  .attr("y2", "100%")
  .attr("spreadMethod", "pad");
gradient.append("svg:stop")         // middle step setting
  .attr("offset", "50%")
  .attr("stop-color", "#FFF")
  .attr("stop-opacity", 0.3);
gradient.append("svg:stop")         // final step setting
  .attr("offset", "100%")
  .attr("stop-color", "#009")
  .attr("stop-opacity", 0.3);
  
svg.append("rect")
  .attr("class","border")
  .attr("x",0)
  .attr("y",0)
  .attr("width", 960)
  .attr("height", 600)
​
var g = svg.append("g")
​
g.append("path")
  .datum(sphere)
  .attr("class", "sphere")
  .attr("d", path)
​
g.append("path")
  .datum(sphere)
  .attr("class", "gradient")
  .attr("d", path)
​
g.append("path")
    .datum(graticule)
    .attr("class", "graticule")
    .attr("d", path)
​
// load data
queue()
    .defer(d3.json, "world-110m.json")
        .defer(d3.json, "beam.json")
    .defer(d3.tsv, "countries.tsv")
    .defer(d3.csv, "stations.csv")
    .await(ready);
​
function ready(error, world, isolines, names, stations) {
  if (error) throw error;
​
  var countries = topojson.feature(world, world.objects.countries).features;
​
  // this folds the TSV country name data into the countries object
  countries = countries.filter(function(d) {
    return names.some(function(n) {
      if (d.id == n.id) return d.name = n.name;
    });
  }).sort(function(a, b) {
    return a.name.localeCompare(b.name);
  });
      
  g.selectAll("circle")
    .data(stations)
    .enter()
  // only visible cities
    .append("circle")
    .attr("cx", function(d) {
    return projection([d.lon, d.lat])[0];
  })
    .attr("cy", function(d) {
    return projection([d.lon, d.lat])[1];
  })
    .attr("r", 3)
    .style("fill","red")
    .attr("visibility", function(d) {
    var mlon = (d.lon % 360) + longitude; 
    if (mlon > -90 && mlon < 90) {
      return 'visible';
    } else {
      return 'hidden';
    }
  })
​
  // TODO: Add labels and make rotate 
  g.selectAll("text")
    .data(stations)
    .enter()
    .append("text") // append text
    .attr("x", function(d) {
      return projection([d.lon, d.lat])[0];
    })
    .attr("y", function(d) {
      return projection([d.lon, d.lat])[1];
    })
    .attr("dx", 5) // set y position of bottom of text
    .attr("class", "cityname")
    .attr("text-anchor", "start") // set anchor y justification
    .attr("alignment-baseline", "middle") // set anchor y justification
    .text(function(d) {
      return d.station;
    })
    .attr("visibility", function(d) {
      var mlon = (d.lon % 360) + longitude; 
      if (mlon > -90 && mlon < 90) {
        return 'visible';
      } else {
        return 'hidden';
      }
    })
    .attr("filter", function(d) {
      var mlon = (d.lon % 360) + longitude; 
      if (mlon > -90 && mlon < 90) {
        return "url(#solid)";
      } else {
        return '';
      }
    })
    
  // show countries 
  g.selectAll(".country")
      .data(countries)
      .enter().insert("path", ".graticule")
      .attr("class", "country")
      .attr("d", path)
//      .on('mouseenter', function(d, i) {
//         d3.select(this).style('fill-opacity', 1);
//      })
//      .on('mouseleave', function(d, i) {
//         d3.select(this).style('fill-opacity',.7);
//         tooltip.classed("hidden", true);
//      })
//      .on("mousemove", function(d) {
//          label = d.name;
//              var mouse = d3.mouse(svg.node())
//                .map( function(d) { return parseInt(d); } );
//              tooltip.classed("hidden", false)
//        .attr("style", "left:"+(mouse[0]+offsetL)+"px;top:"+(mouse[1]+offsetT)+"px")
//        .html(label);
//      })
​
​
    var geojson = topojson.feature(isolines, isolines.objects.TEST).features;
​
    g.selectAll("isoline")
        .data(geojson)
      .enter().append("path")
        .attr("class", "beam")
         .attr("d", path)
        .on('mouseenter', function(d, i) {
          d3.select(this).style('fill-opacity', .3);
        })
        .on('mouseleave', function(d, i) {
          d3.select(this).style('fill-opacity', .1);
          tooltip.classed("hidden", true);
        })
        .on("mousemove", function(d) {
          label = d.properties.Name + ' dB';
          var mouse = d3.mouse(svg.node())
            .map( function(d) { return parseInt(d); } );
          tooltip.classed("hidden", false)
            .attr("style", "left:"+(mouse[0]+offsetL)+"px;top:"+(mouse[1]+offsetT)+"px")
            .html(label);
        })
  
};
​
  
  // zoom and pan
var zoom = d3.zoom()
    .scaleExtent([1, 19])
    .translateExtent([[0,0],[960,600]])
    .extent([[0,0],[960,460]])
        .on("zoom",function() {
        g.attr("transform", d3.event.transform)
        g.selectAll("circle")
            .attr("d", path.projection(projection));
​
  });
​
svg.call(zoom)
​
svg.append("rect")
    .attr("class","clip")
    .attr("x",0)
    .attr("y",600)
    .attr("width", 960)
    .attr("height", 600)
​
​
var offsetL = document.getElementById('map').offsetLeft+10;
var offsetT = document.getElementById('map').offsetTop+10;
  
var tooltip = d3.select("#map")
  .append("div")
  .attr("class", "tooltip hidden");
​
var x = d3.scaleLinear()
    .domain([180, -180])
    .range([0, width])
    .clamp(true);
​
var slider = svg.append("g")
    .attr("class", "slider")
    .attr("transform", "translate(0 620)")
​
slider.append("line")
    .attr("class", "track")
    .attr("x1", x.range()[0])
    .attr("x2", x.range()[1])
    .select(function() { return this.parentNode.appendChild(this.cloneNode(true)); })
    .attr("class", "track-inset")
    .select(function() { return this.parentNode.appendChild(this.cloneNode(true)); })
    .attr("class", "track-overlay")
    .call(d3.drag()
        .on("start.interrupt", function() { slider.interrupt(); })
        .on("start drag", function() { slide(x.invert(d3.event.x)); }));
​
slider.insert("g", ".track-overlay")
    .attr("class", "ticks")
    .attr("transform", "translate(0," + 18 + ")")
    .selectAll("text")
    .data(x.ticks(10))
    .enter().append("text")
    .attr("x", x)
    .attr("text-anchor", "middle")
    .text(function(d) { return d + "°"; });
​
var handle = slider.insert("circle", ".track-overlay")
    .attr("class", "handle")
    .attr("cx", 480)
    .attr("id", "longitude")
    .attr("r", 9);
​
var feature = g.selectAll("path");
​
function setGlobeRotation() {
  projection.rotate([longitude,0]);
  g.selectAll("path").attr("d", path);
  g.selectAll("circle")
    .attr("cx", function(d) {
      return projection([d.lon, d.lat])[0];
    })
    .attr("cy", function(d) {
      return projection([d.lon, d.lat])[1];
    })
    .attr("visibility", function(d) {
       var mlon = (d.lon % 360) + longitude; 
       if (mlon > -90 && mlon < 90) {
         return 'visible';
       } else {
         return 'hidden';
       }
    })
  g.selectAll("text")
    .attr("x", function(d) {
      return projection([d.lon, d.lat])[0];
    })
    .attr("y", function(d) {
      return projection([d.lon, d.lat])[1];
    })
    .attr("visibility", function(d) {
      var mlon = (d.lon % 360) + longitude; 
      if (mlon > -90 && mlon < 90) {
        return 'visible';
      } else {
        return 'hidden';
      }
    })  
    .attr("filter", function(d) {
      var mlon = (d.lon % 360) + longitude; 
      if (mlon > -90 && mlon < 90) {
        return "url(#solid)";
      } else {
        return '';
      }
    })
}
  
function slide(h) {
  handle.attr("cx", x(h));
  longitude = h;
  setGlobeRotation()
}
​
var sats = svg.append("g")
  .attr("class", "sats")
  .attr("transform", "translate(0 660)")
​
d3.csv("satellites.csv", function(error, satellites) {
    sats.selectAll("rect")
    .data(satellites)
    .enter()
    .append("rect")
    .attr("x", function(d) {
        return x(d.longitude) - 5;
    })
    .attr("y", -10)
    .attr("height", 20)
    .attr("width", 10)
    .attr("class","satellite")
    .on("click", function(d){
      longitude = d.longitude;
      setGlobeRotation();
      handle.attr("cx",x(d.longitude))
    })
    
    sats.selectAll("text")
    .data(satellites)
    .enter()
    .append("text") // append text
    .attr("x", function(d) {
      return x(d.longitude);
    })
    .attr("dx", 15) // set y position of bottom of text
    .attr("class", "cityname")
    .attr("text-anchor", "start") // set anchor y justification
    .attr("alignment-baseline", "middle") // set anchor y justification
    .text(function(d) {
    return d.name;
  })
});
 
  
</script>
​
    