D3.js geoMtFlatPolarSinusoidal() Function

Last Updated : 23 Sep, 2020

The JavaScript D3.js library provides interactive data visualizations for web page using HTML5, Scalable Vector Graphics, and Cascading Style Sheets.
The geoMtFlatPolarSinusoidal() function in d3.js is used to draw The McBryde–Thomas flat-polar sinusoidal equal-area projection.

Syntax:

d3.geoMtFlatPolarSinusoidal()

Parameters: This method does not accept any parameters.

Return Value: This method creates the McBryde–Thomas flat-polar sinusoidal equal-area projection from given JSON data.

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

HTML

<!DOCTYPE html> 
<html lang="en"> 
  
<head> 
    <meta charset="UTF-8" /> 
    <meta name="viewport" content= 
        "width=device-width, initial-scale=1.0" /> 
    <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"); 
  
        // MtFlatPolarSinusoidal projection 
        // Center(0,0) with 0 rotation 
        var gfg = d3.geoMtFlatPolarSinusoidal() 
            .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", "SaddleBrown") 
                    .attr("d", d3.geoPath() 
                        .projection(gfg) 
                    ) 
                    .style("stroke", "#ffff") 
            }) 
    </script> 
</body> 
  
</html> 

Output:

Example 2: In following example, we will create MtFlatPolarSinusoidal projection of world with center at (0, 10) and rotating 60 degree with respect to Y axis.

HTML

<!DOCTYPE html> 
<html lang="en"> 
  
<head> 
    <meta charset="UTF-8" /> 
    <meta name="viewport" content= 
        "width=device-width, initial-scale=1.0" /> 
    <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"); 
  
        // MtFlatPolarSinusoidal  projection 
        // Center(0,10) and 60 degree 
        // rotation w.r.t Y axis 
        var gfg = d3.geoMtFlatPolarSinusoidal() 
            .scale(width / 1.7 / Math.PI) 
            .rotate([60, 0]) 
            .center([0, 10]) 
            .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", "GoldenRod") 
                    .attr("d", d3.geoPath() 
                        .projection(gfg) 
                    ) 
                    .style("stroke", "#ffff") 
            }) 
    </script> 
</body> 
  
</html> 