D3 Examples - FINAL UPDATE

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<!DOCTYPE html>
<meta charset="utf-8">
<title>Class 10</title>
<style>
h1 { 
    
  display: block;
    font-size: 1.5em;
    text-align: LEFT;
    margin-top: 0.67em;
    margin-bottom: 0.67em;
    margin-left: 0;
    margin-right: 0;
    font-weight: bold;
}
  body {
  margin: 0;
}
path {
  fill: none;
  stroke: #006400;
  stroke-linejoin: round;
  stroke-width: 3px;
}
.info {
  color: #000;
  position: absolute;
  background-color:     #66CDAA;
  visibility: hidden;
  padding: 0.5em;
  bottom: 50px;
  right: 50px;
}
.tooltip {
  position: absolute;
  visibility: visible;
  background-color: #E9967A;
  padding: 8px;
}
img {
    max-width: 50%;
    max-height: 50%;
}
</style>
<svg></svg>
<div class='info'></div>
<script src="//d3js.org/d3.v4.min.js"></script>
<script src="//d3js.org/d3-tile.v0.0.min.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script>
var tooltip = d3.select('body').append('div')
    .attr('class', 'tooltip')
var pi = Math.PI,
    tau = 2 * pi;
var width = Math.max(960, window.innerWidth),
    height = Math.max(500, window.innerHeight);
// Initialize the projection to fit the world in a 1×1 square centered at the origin.
var projection = d3.geoMercator()
    .scale(1 / tau)
    .translate([0, 0]);
// Define the tooltip for hover-over info windows
var div = d3.select("body").append("div")   
    .attr("class", "tooltip")               
    .style("opacity", 10);
var path = d3.geoPath()
    .projection(projection)
    .pointRadius(3);
var tile = d3.tile()
    .size([width, height]);
var zoom = d3.zoom()
    .scaleExtent([1 << 11, 1 << 24])
    .on("zoom", zoomed);
var svg = d3.select("svg")
    .attr("width", width)
    .attr("height", height);
var raster = svg.append("g");
var bstations = svg.append("g");
var trl = svg.append("g");
var LM = svg.append("circle")
    .attr("r",5)
    .style("fill","yellow")
var color = d3.scaleOrdinal(d3.schemeCategory10);
var layer1 = svg.append("g");
var layer2 = svg.append("g");
var trails = "https://raw.githubusercontent.com/AnaMal08/classes/master/finalproject/trails.json";
var stations = "https://raw.githubusercontent.com/AnaMal08/classes/master/finalproject/sharebike2.json";
var places = "https://raw.githubusercontent.com/AnaMal08/classes/master/finalproject/poinfOfIntrest.json";
var legend = layer2.selectAll('.legend')
    .data(d3.range(10))
  .enter().append('g')
    .attr('class', 'legend')
    .attr('transform', 'translate(' + [width - 150, height / 3] +')');
legend.append('circle')
    .attr('cy', function(d) { return 4 * d * path.pointRadius() ; })
    .attr('r', path.pointRadius())
    .attr('fill', color)
    .attr('stroke', '#aaaaaa')
legend.append('text')
    .attr('x', '1em')
    .attr('y', function(d) { return 4 * d * path.pointRadius(); })
    .attr('dy', '.3em')
    .text(function(d) { return d + ' - ' + (d + 1); })
d3.queue()
    .defer(d3.json, trails)
    .defer(d3.json, stations)
    .await(ready);
function ready(error, trails, stations) {
  if (error) throw error;
  // add trails 
      trl = trl.selectAll(".trail")
      .data(trails.features)
    .enter().append("path")
      .attr("class", "trail")
      .style("fill", 'none')
        .style("stroke", '#006400')
              .on("mouseover", function(d) {
          div.transition()
            .duration(200)
            .style("opacity", .8)
          div.html("<font size = 3>" + "<u>" + "Trail Name:" + "</u>" + " " + d.properties.NAME + "<br>" + "<font size = 3>" + "<u>" + "Length of trail:" + "</u>" + " " + ((d.properties.LENGTH)*0.00018939).toFixed(2) + " " +"miles" )        
            .style("left", (d3.event.pageX + 10) + "px")
            .style("top", (d3.event.pageY - 30) + "px");
        })
                .on("mouseout", function(d) {
                         div.transition()
            .duration(500)
            .style("opacity", 0);
        });
  // add bakiestations 
  bstations = bstations.selectAll(".station")
      .data(stations.features)
    .enter().append("path")
      .attr("class", "station")
      .style("fill", '#B22222')
        .style("stroke", 'none')
              .on("mouseover", function(d) {
          div.transition()
            .duration(200)
            .style("opacity", .8) 
          div.html("<font size = 3>" + "<u>" + "Address:" + "</u>" + " " +               d.properties.ADDRESS +"<br>" + "<font size = 3>" + "<u>" + "Number of bikes:" + "</u>" + " " + d.properties.NUMBER_OF_BIKES)          
            .style("left", (d3.event.pageX + 10) + "px")
            .style("top", (d3.event.pageY - 30) + "px");
        })
                .on("mouseout", function(d) {
                         div.transition()
            .duration(500)
            .style("opacity", 0);
        });
  // add points of intrest 
 
  // Compute the projected initial center for DC
  var center = projection([-77.04, 38.91]);
  // Apply a zoom transform equivalent to projection.{scale,translate,center}.
  svg
      .on('mousemove', mousemoved)
      .on('mouseout', function() { d3.select('.info').style('visibility', 'hidden') })
      .call(zoom)
      .call(zoom.transform, d3.zoomIdentity
          .translate(width / 2, height / 2)
          .scale(1 << 19)
          .translate(-center[0], -center[1]));
}
function zoomed() {
  var transform = d3.event.transform;
  var tiles = tile
      .scale(transform.k)
      .translate([transform.x, transform.y])
      ();
  projection
      .scale(transform.k / tau)
      .translate([transform.x, transform.y]);
  trl
      .attr("d", path);
  bstations
      .attr("d", path);
  LM
      .attr('cx', projection([-77.05018389318994, 38.88929091200698])[0])
      .attr('cy', projection([-77.05018389318994, 38.88929091200698])[1])
        .style("stroke", 'none')
              .on("mouseover", function(d) {
          div.transition()
            .duration(2000)
            .style("opacity", 1)            
          div.html("<span style='color:blue'><h1>Lincoln Memorial</h1><br><img src='https://theenchantedmanor.com/wp-content/uploads/2015/02/Lincoln-Memorial-1.jpg'></span> <span style='color:blue'></span>")          
        })
​
  var image = raster
      .attr("transform", stringify(tiles.scale, tiles.translate))
    .selectAll("image")
    .data(tiles, function(d) { return d; });
  image.exit().remove();
  image.enter().append("image")
      .attr("xlink:href", function(d) { return "https://" + "abc"[d[1] % 3] + ".tile.openstreetmap.org/" + d[2] + "/" + d[0] + "/" + d[1] + ".png"; })
      .attr("x", function(d) { return d[0] * 256; })
      .attr("y", function(d) { return d[1] * 256; })
      .attr("width", 256)
      .attr("height", 256);
}
function stringify(scale, translate) {
  var k = scale / 256, r = scale % 1 ? Number : Math.round;
  return "translate(" + r(translate[0] * scale) + "," + r(translate[1] * scale) + ") scale(" + k + ")";
}
function mousemoved() {
  d3.select('.info')
      .style('visibility', 'visible')
      .text(formatLocation(projection.invert(d3.mouse(this)), projection.scale()));
}
function formatLocation(p, k) {
  var format = d3.format("." + Math.floor(Math.log(k) / 2 - 2) + "f");
  return (p[1] < 0 ? format(-p[1]) + "°S" : format(p[1]) + "°N") + " "
       + (p[0] < 0 ? format(-p[0]) + "°W" : format(p[0]) + "°E");
}
</script>
    