D3.js geoVanDerGrinten2() Function

Last Updated : 23 Sep, 2020

D3.js is a JavaScript library for producing dynamic, interactive data visualizations in web browsers. It makes use of Scalable Vector Graphics, HTML5, and Cascading Style Sheets standards.

The geoVanDerGrinten2() function in d3.js is used to draw The Van der Grinten II projection.

Syntax:

d3.geoVanDerGrinten2()

Parameters: This method does not accept any parameters.

Return Value: This method creates geoVanDerGrinten II projection from given JSON data.

Example 1: The following example draws Van Der Grinten II projection of the world with the center at (0,0) and 0 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:600px;">  
        <svg width="700" height="400">  
        </svg>  
    </div>  
  
    <script> 
        var svg = d3.select("svg"), 
            width = +svg.attr("width"), 
            height = +svg.attr("height"); 
  
        // VanDerGrinten2  projection 
        // Center(0,0) and 0 rotation  
        var gfg = d3.geoVanDerGrinten2() 
            .scale(width / 3.0 / 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){ 
                // 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>

Output :

VanDerGrinten2 projection of World with no rotation and centered at (0,0)

Example 2: The following example draws Van Der Grinten II projection of the world after altering the center and 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:600px;">  
        <svg width="700" height="400">  
        </svg>  
    </div>  
  
    <script> 
        var svg = d3.select("svg"), 
            width = +svg.attr("width"), 
            height = +svg.attr("height"); 
  
        // VanDerGrinten2  projection 
        // Center(10,10) and 45 degree rotation w.r.t  Y axis 
        var gfg = d3.geoVanDerGrinten2() 
            .scale(width / 3.0 / Math.PI) 
            .rotate([45,0]) 
            .center([10,10]) 
            .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>