D3.js geoMiller() Function

Last Updated : 23 Sep, 2020

The geoMiller() function in d3.js is used to draw the Miller cylindrical projection of the given geojson data.

Syntax:

d3.geoMiller()

Parameters: This method does not accept any parameters.

Returns: This method draws the Miller cylindrical projection.

Example 1: The following example draws the Miller projection of the world with the center at (0, 0) and rotation of 0 degrees.

HTML

<!DOCTYPE html> 
<html> 
<head> 
  <script src= 
"https://d3js.org/d3.v4.js"> 
  </script> 
  <script src= 
"https://d3js.org/d3-geo-projection.v2.min.js"> 
  </script> 
</head> 
<body> 
  <div style="width:700px; height:500px;"> 
    <svg width="600" height="450"></svg> 
  </div> 
  <script> 
    var svg = d3.select("svg"), 
      width = +svg.attr("width"), 
      height = +svg.attr("height"); 
  
    // Miller projection with the 
    // Center at (0, 0) and rotation 
    // of 0 degrees 
    var gfg = d3.geoMiller() 
      .scale(width / 1.8 / Math.PI) 
      .rotate([0, 0]) 
      .center([0, 0]) 
      .translate([width / 2, height / 2]); 
  
    // Loading the json data 
    d3.json("https://raw.githubusercontent.com/" + 
            "janasayantan/datageojson/master/" + 
            "world.json", 
            function (data) { 
  
      // Drawing the map 
      svg.append("g") 
        .selectAll("path") 
        .data(data.features) 
        .enter().append("path") 
        .attr("fill", "Black") 
        .attr("d", d3.geoPath() 
          .projection(gfg) 
        ) 
        .style("stroke", "#ffff") 
    }); 
  </script> 
</body> 
</html>

Output:

Example 2: The following example draws the Miller projection of the world with the center at (-10, 0) and rotation of 90 degrees with respect to the y-axis.

HTML

<html> 
<head> 
  <script src= 
"https://d3js.org/d3.v4.js"> 
  </script> 
  <script src= 
"https://d3js.org/d3-geo-projection.v2.min.js"> 
  </script> 
</head> 
<body> 
  <div style="width:700px; height:600px;"> 
    <svg width="500" height="450"></svg> 
  </div> 
  <script> 
    var svg = d3.select("svg"), 
      width = +svg.attr("width"), 
      height = +svg.attr("height"); 
  
    // Miller projection with the 
    // Center at (-10, 0) and a rotation of  
    // 90 degrees w.r.t y-axis 
    var gfg = d3.geoMiller() 
      .scale(width / 1.8 / Math.PI) 
      .rotate([90, 0]) 
      .center([-10, 0]) 
      .translate([width / 2, height / 2]); 
  
    // Loading the json data 
    d3.json("https://raw.githubusercontent.com/" + 
            "janasayantan/datageojson/master/" + 
            "world.json", 
            function (data) { 
  
      // Draw the map 
      svg.append("g") 
        .selectAll("path") 
        .data(data.features) 
        .enter().append("path") 
        .attr("fill", "black") 
        .attr("d", d3.geoPath() 
          .projection(gfg) 
        ) 
        .style("stroke", "#ffff") 
    }); 
  </script> 
</body> 
</html>