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D3.js geoLoximuthal() Function

  • Last Updated : 14 Oct, 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 geoLoximuthal() function in d3.js is used to draw The loximuthal projection.

Syntax:

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d3.geoLoximuthal()

Parameters: This method does not accept any parameters.

Return Value: This method creates The Loximuthal  projection from given json data.



Example 1: The following example draws loximuthal   projection of world with center at (0, 0) and 0 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=
    </script>
    <script>
        var svg = d3.select("svg"),
            width = +svg.attr("width"),
            height = +svg.attr("height");
  
        // Loximuthal projection
        // Center(0, 0) with 0 rotation
        var gfg = d3
            .geoLoximuthal()
            .scale(width / 2.0 / Math.PI)
            .rotate([0, 0])
            .center([0, 0])
            .translate([width / 2, height / 2]);
  
        // Loading the json data
        // Used json file stored at 
                    /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", "black")
                    .attr("d", d3.geoPath().projection(gfg))
                    .style("stroke", "#ffff");
            });
    </script>
</body>
  
</html>

Output:


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

Example 2: The following example draws Loximuthal projection of world after altering the center and 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: 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=
    </script>
    <script>
        var svg = d3.select("svg"),
            width = +svg.attr("width"),
            height = +svg.attr("height");
  
        // Loximuthal  projection
        // Center(0, 20) and 90 degree
        // rotation w.r.t Y axis
        var gfg = d3
            .geoLoximuthal()
            .scale(width / 2.0 / Math.PI)
            .rotate([90, 0])
            .center([20, 20])
            .translate([width / 2, height / 2]);
  
        // Loading the json data
        // Used json file stored at 
                    /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>

Output:


Loximuthal projection with 90 degree rotation w.r.t  Y axis  and centered at (20, 20)




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