D3.js geoSinuMollweide() Function

Last Updated : 15 Oct, 2020

The JavaScript D3.js library provides interactive data visualizations for web page using HTML5, Scalable Vector Graphics, and Cascading Style Sheets.
The geoSinuMollweide() function in d3.js is used to draw the Allen K. Philbrick’s Sinu-Mollweide projection.

Syntax:

d3.geoSinuMollweide()

Parameters: This method does not accept any parameters.

Return Value: This method creates the Sinu-Mollweide projection from given JSON data.

Example 1: The following example creates SinuMollweide projection of world with center at (0, 0) and no rotation.

<!DOCTYPE html> 
<html lang="en"> 
  
<head> 
    <meta charset="UTF-8" /> 
    <meta name="viewport" content="width=device-width,  
                initial-scale=1.0" /> 
</head> 
  
<body> 
    <div style="width: 700px; height: 500px;"> 
        <center> 
            <h3 style="color: black;"></h3> 
        </center> 
  
        <svg width="600" height="450"></svg> 
    </div> 
    <script src="https://d3js.org/d3.v4.js"></script> 
    <script src= 
    "https://d3js.org/d3-geo-projection.v2.min.js"> 
    </script> 
  
    <script> 
        var svg = d3.select("svg"), 
            width = +svg.attr("width"), 
            height = +svg.attr("height"); 
  
        // SinuMollweide projection 
        // Center(0, 0) with 0 rotation 
        var gfg = d3 
            .geoSinuMollweide() 
            .scale(width / 1.8 / Math.PI) 
            .rotate([0, 0]) 
            .center([0, 0]) 
            .translate([width / 2, height / 2]); 
  
        // Loading the json data 
        // Used json file stored at  
        /*https://raw.githubusercontent.com/janasayantan 
                    /datageojson/master/world.json*/ 
        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", "DarkSlateGrey") 
                    .attr("d", d3.geoPath().projection(gfg)) 
                    .style("stroke", "#ffff"); 
            }); 
    </script> 
</body> 
  
</html> 

Output:

Example 2: In following example we will create SinuMollweide projection of world with center at (10, 0) and rotating -90 degree with respect to Y axis.

<!DOCTYPE html> 
<html lang="en"> 
  
<head> 
    <meta charset="UTF-8" /> 
    <meta name="viewport" content="width=device-width,  
                initial-scale=1.0" /> 
</head> 
  
<body> 
    <div style="width: 700px; height: 600px;"> 
        <center> 
            <h3 style="color: black;"></h3> 
        </center> 
  
        <svg width="500" height="450"></svg> 
    </div> 
    <script src="https://d3js.org/d3.v4.js"></script> 
    <script src= 
    "https://d3js.org/d3-geo-projection.v2.min.js"> 
    </script> 
  
    <script> 
        var svg = d3.select("svg"), 
            width = +svg.attr("width"), 
            height = +svg.attr("height"); 
  
        // SinuMollweide  projection 
        // Center(10, 0) and -90 degree 
        // rotation w.r.t Y axis 
        var gfg = d3 
            .geoSinuMollweide() 
            .scale(width / 1.8 / Math.PI) 
            .rotate([-90, 0]) 
            .center([10, 0]) 
            .translate([width / 2, height / 2]); 
  
        // Loading the json data 
        // Used json file stored at  
        /*https://raw.githubusercontent.com/janasayantan 
                    /datageojson/master/world.json */ 
        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", "grey") 
                    .attr("d", d3.geoPath().projection(gfg)) 
                    .style("stroke", "#ffff"); 
            }); 
    </script> 
</body> 
  
</html> 