D3 Examples - Custom Cartesian Projection

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
.lot {
  fill: lightgray;
  stroke: black;
}
​
</style>
<svg width="960" height="500"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
​
var svg = d3.select("svg"),
    width = +svg.attr("width"),
    height = +svg.attr("height");
​
var x = d3.scaleLinear()
    .range([0, width]);
​
var y = d3.scaleLinear()
    .range([0, height]);
​
var projection = d3.geoTransform({
  point: function(px, py) {
    this.stream.point(x(px), y(py));
  }
});
​
var path = d3.geoPath()
    .projection(projection);
​
d3.json("geo.json", function(error, geo) {
  if (error) throw error;
​
  x.domain(d3.extent(geo.features, function(d) { return d.properties.Easting; }));
  y.domain(d3.extent(geo.features, function(d) { return d.properties.Northing; }));
​
  svg.append("path")
      .datum(geo)
      .attr("class", "lot")
      .attr("d", path);
});
​
</script>
​
    