D3 Examples - Dynamic Markers

Dynamic Markers - d3.carto
Dynamic markers with d3.carto.map.
This example simply shows that if your code can handle different types of SVG elements used as markers, then it can adjust those markers even when you've changed them from their default shape. If you click on any marker, it will show the network distance from that marker to all other markers (or gray if inaccessible). Even if you change the markers to little mailboxes by clicking SVG Marker, clicking on a little mailbox will still show network distance, this time with little mailboxes.
Little mailbox icon is public domain, as all icons should be.
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<html xmlns="https://www.w3.org/1999/xhtml">
<head>
  <title>Responsive Markers - d3.carto</title>
  <meta charset="utf-8" />
    <link type="text/css" rel="stylesheet" href="d3map.css" />
    <link type="text/css" rel="stylesheet" href="https://raw.githubusercontent.com/emeeks/d3-carto-map/master/examples/example.css" />
</head>
<style>
  html,body {
    height: 100%;
    width: 100%;
    margin: 0;
  }
​
  #map {
    height: 100%;
    width: 100%;
    position: absolute;
  }
  
  .reproject {
    position: absolute;
    z-index: 99;
    left: 50px;
    top: 250px;
  }
​
  .node {
    fill: blue;
    stroke: black;
    stroke-width: 1
  }
  
  .markerButton {
    position: fixed;
    top: 20px;
    z-index: 99;
    cursor: pointer;
  }
  .roads {
    fill: none;
    stroke: brown;
    stroke-width: 2px;
  }
  
</style>
<script>
  
  function rectangleMarker() {
    d3.selectAll("g.marker").selectAll("*").remove();
    d3.selectAll("g.marker").append("rect").attr("height", 10).attr("width", 10)
    .attr("x", -5)
    .attr("y", -5)
    .style("fill", "yellow")
    .style("stroke", "black")
    .style("stroke-width", "1px")
  }
  
  function circleMarker() {
    d3.selectAll("g.marker").selectAll("*").remove();
    d3.selectAll("g.marker").append("circle").attr("r", 5)
    .style("fill", "blue")
    .style("stroke", "black")
    .style("stroke-width", "1px")
  }
  
  function svgMarker() {
    d3.selectAll("g.marker").selectAll("*").remove();
    d3.html("icon_2330.svg", loadSVG);
     function loadSVG(svgData) {
    d3.select(svgData).selectAll("path").each(function(d) {
      var that = this;
        d3.selectAll("g.marker").each(
          function() {
          d3.select(this).node().appendChild(that.cloneNode(true));
          }
          )
    })
    d3.selectAll("g.marker").select("path");
     }
  }
​
  function makeSomeMaps() {
    pathSource = 0;
​
    map = d3.carto.map();
​
    d3.select("#map").call(map);
    map.centerOn([-88,39],"latlong");
    map.setScale(4);
​
    map.refresh();
​
    wcLayer = d3.carto.layer.tile();
    wcLayer
    .tileType("stamen")
    .path("watercolor")
    .label("Watercolor")
    .visibility(true)
​
    postLayer = d3.carto.layer.topojson();
    postLayer
    .path("uspost.topojson")
    .label("Postal Routes")
    .cssClass("roads")
    .renderMode("svg")
    .on("load", createMatrix);
​
    map.addCartoLayer(wcLayer).addCartoLayer(postLayer);
​
    function createMatrix() {
      postdata = postLayer.features()
      edgeList = [];
      edgeMap = {};
      nodes = [];
      nodeHash = {};
      for (x in postdata) {
        var line = postdata[x].geometry.coordinates;
        var lS = line[0];
        var lE = line[line.length - 1];
        var nA = [lS,lE];
        for (y in nA) {
        if (!nodeHash["node" + Math.ceil(nA[y][0] * 1000) + (nA[y][1] * 1000)]) {
          var newNode = {label: "Node " + nodes.length, id: nodes.length.toString(), coordinates: [nA[y]], x: nA[y][0], y: nA[y][1]}
          nodeHash["node" + Math.ceil(nA[y][0] * 1000) + (nA[y][1] * 1000)] = newNode;
          nodes.push(newNode)
        }
        }
        postdata[x].properties.source = nodeHash["node" + Math.ceil(lS[0] * 1000) + (lS[1] * 1000)];
        postdata[x].properties.target = nodeHash["node" + Math.ceil(lE[0] * 1000) + (lE[1] * 1000)];
        postdata[x].properties.cost = d3.geo.length(postdata[x]) * 6371;
      }
​
    nodeLayer = d3.carto.layer.xyArray();
    nodeLayer
    .features(nodes)
    .label("Vertices")
    .cssClass("node")
    .renderMode("svg")
    .x("x")
    .y("y")
    .markerSize(5)
    .clickableFeatures(true)
    .on("load", function() {nodeLayer.g().selectAll("g.marker").on("click", function(d) {flood(d.id)})});
    map.addCartoLayer(nodeLayer);
    
    for (x in postdata) {
      if (edgeMap[postdata[x].properties.source.id]) {
        edgeMap[postdata[x].properties.source.id][postdata[x].properties.target.id] = postdata[x].properties.cost;
      }
      else {
        edgeMap[postdata[x].properties.source.id] = {};
        edgeMap[postdata[x].properties.source.id][postdata[x].properties.target.id] = postdata[x].properties.cost;
      }
      if (edgeMap[postdata[x].properties.target.id]) {
        edgeMap[postdata[x].properties.target.id][postdata[x].properties.source.id] = postdata[x].properties.cost;
      }
      else {
        edgeMap[postdata[x].properties.target.id] = {};
        edgeMap[postdata[x].properties.target.id][postdata[x].properties.source.id] = postdata[x].properties.cost;
      }
    }
​
      graph = new Graph(edgeMap);
    }
​
   function flood(siteID) {
    siteDistance = d3.keys(graph.map).map(function(d) {return Infinity});
    siteDistance[siteID] = 0;
    
    var map = graph.map;
    var calculatedSites = [siteID];
    var connectedSites = d3.keys(graph.map[siteID]);
    var visitedSites = [siteID];
    var sitesToVisit = [siteID];
    var currentNode = siteID;
    var currentCost = 0;
​
    while (sitesToVisit.length > 0) {
      sitesToVisit.splice(0,1);
    for (x in connectedSites) {
      if (calculatedSites.indexOf(connectedSites[x]) == -1) {
          calculatedSites.push(connectedSites[x]);
          siteDistance[connectedSites[x]] = currentCost + map[currentNode][connectedSites[x]];
      }
      else {
          siteDistance[connectedSites[x]] = Math.min(currentCost + map[currentNode][connectedSites[x]], siteDistance[connectedSites[x]]);
      }
      
      if (visitedSites.indexOf(connectedSites[x]) == -1 && sitesToVisit.indexOf(connectedSites[x]) == -1) {
        sitesToVisit.push(connectedSites[x]);
      }
      }
      visitedSites.push(currentNode)
​
          //sort sitesToVisit
          sitesToVisit = sitesToVisit.sort(function(a,b) {
    if (siteDistance[a] < siteDistance[b])
    return -1;
    if (siteDistance[a] > siteDistance[b])
    return 1;
    return 0;
    })
      currentNode = sitesToVisit[0];
      currentCost = siteDistance[currentNode];
      connectedSites = d3.keys(graph.map[currentNode]);
​
    }
    
    color = d3.scale.linear().domain([0,500,3500]).range(["green","yellow","red"])
    nodeLayer.g().selectAll("g.marker").selectAll("*").style("fill", "lightgray")
    .transition()
    .delay(function(d) {return siteDistance[d.id] == Infinity ? 5000 : siteDistance[d.id] * 2})
    .duration(1000)
    .style("fill", function(d) {return siteDistance[d.id] == Infinity ? "gray" : color(siteDistance[d.id])})
​
​
    }
​
  }
</script>
<body onload="makeSomeMaps()">
<div id="map">
    <button style="left: 140px;" class="markerButton" onclick="rectangleMarker();">Rectangle Marker</button>
  <button style="left: 250px;" class="markerButton" onclick="circleMarker();">Circle Marker</button>
  <button style="left: 338px;" class="markerButton" onclick="svgMarker();">SVG Marker</button>
</div>
<footer>
<script src="https://d3js.org/d3.v3.min.js" charset="utf-8" type="text/javascript"></script>
<script src="https://d3js.org/topojson.v1.min.js" type="text/javascript">
</script>
<script src="https://d3js.org/d3.geo.projection.v0.min.js" type="text/javascript">
</script>
<script src="/emeeks/f3105fda25ff785dc5ed/example/tile.js" type="text/javascript">
</script>
<script src="/emeeks/f3105fda25ff785dc5ed/example/d3.quadtiles.js" type="text/javascript">
</script>
<script src="/emeeks/f3105fda25ff785dc5ed/example/d3.geo.raster.js" type="text/javascript">
</script>
<script src="https://cdn.jsdelivr.net/gh/emeeks/d3-carto-map/d3.carto.map.js" type="text/javascript">
</script>
<script src="dijkstra.js" type="text/javascript">
</script>
</footer>
</body>
</html>
​
    