D3 Examples - HW7_FV

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
#streets {
  fill: none;
  stroke: black;
  stroke-width: 1.5px;
  stroke-linejoin: round;
}
​
</style>
<svg width="960" height="500"></svg>
<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 pi = Math.PI,
    tau = 2 * pi;
​
var svg = d3.select("svg"),
    width = +svg.attr("width"),
    height = +svg.attr("height");
  
var projection = d3.geoMercator()
    .scale((1 << 18) / tau)
    .translate([width / 2, height / 2])
    .center([-83.15, 42.43]);
​
​
var path = d3.geoPath()
    .projection(projection);
​
​
​
var url = "https://umbcvis.github.io/classes/class-03/us.json"
​
//var states =array of geojson states
​
d3.json(url, function(error, us) {
  if (error) throw error;  
  
var states = us.objects.us.geometries.map(function(d) { return topojson.feature(us, d); })
​
var ok = states.filter(function(d){return d.properties.name === "Oklahoma";});
 console.log('HERE I AM', states.length, ok.length);
 var extent = [[0,0],[width,height]];
 projection = projection.fitExtent(extent, ok[0]);
 console.log("HERE I AM AGAIN", projection.translate())
 projection.translate([2225,-672])
​
  var tiles = d3.tile()
      .size([width, height])
      .scale(projection.scale() * tau)
      .translate(projection([0, 0]))
      ();
​
  svg.selectAll("image")
      .data(tiles)
    .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] + tiles.translate[0]) * tiles.scale; })
      .attr("y", function(d) { return (d[1] + tiles.translate[1]) * tiles.scale; })
      .attr("width", tiles.scale)
      .attr("height", tiles.scale);
  
​
​
  svg.append("path")
      .attr("id", "streets")
      .datum(topojson.mesh(us, us.objects.us))
      .attr("d", path);
});
​
</script>
    