D3.js geoGringortenQuincuncial() Function

Last Updated : 29 Sep, 2020

D3.js is a JavaScript library which provides interactive data visualizations for web pages using HTML5, Scalable Vector Graphics and Cascading Style Sheets. The geoGringortenQuincuncial() function of D3.js is used to draw the Gringorten square equal-area projection.

Syntax:

d3.geoGringortenQuincuncial()

Parameters: This method does not accept any parameter.

Return Values: This method creates Gringorten square equal-area projection from the given JSON data.

Example 1: The following example draws geoGringortenQuincuncial projection of world with 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" /> 
</head> 
  
<body> 
    <div style="width:700px; height:500px;"> 
  
        <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"); 
  
        // GringortenQuincuncial projection 
        // Center(0, 0) with 0 rotation 
        var gfg = d3.geoGringortenQuincuncial() 
            .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", "SeaGreen") 
                    .attr("d", d3.geoPath() 
                        .projection(gfg) 
                    ) 
                    .style("stroke", "#ffff") 
            }) 
    </script> 
</body> 
  
</html> 

Output: The following output shows GringortenQuincuncial projection of world with no rotation and centered at (0, 0)

Example 2: The following example draws GringortenQuincuncial projection of 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" /> 
</head> 
  
<body> 
    <div style="width:700px; height:600px;"> 
        <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"); 
  
        // GringortenQuincuncial  projection 
        // Center(0, 20) and 20 degree  
        // rotation to Y axis 
        var gfg = d3.geoGringortenQuincuncial() 
            .scale(width / 1.5 / Math.PI) 
            .rotate([20, 0]) 
            .center([0, 20]) 
            .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", "Turquoise") 
                    .attr("d", d3.geoPath() 
                        .projection(gfg) 
                    ) 
                    .style("stroke", "#ffff") 
            }) 
    </script> 
</body> 
  
</html> 