Skip to content
Related Articles

Related Articles

Improve Article

D3.js geoCylindricalStereographic() Function

  • Last Updated : 14 Oct, 2020
Geek Week

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 CylindricalEqualArea() function in d3.js is used to draw the cylindrical stereographic projection. 

Syntax:

d3.geoCylindricalStereographic()

Parameters: This method does not accept any parameters.

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

Example 1: The following example draws CylindricalStereographic  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");
  
        // CylindricalStereographic projection
        // Center(0, 0) with 0 rotation
        var gfg = d3.geoCylindricalStereographic()
            .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:

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

Example 2 : The following example draws CylindricalStereographic  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");
  
        // CylindricalStereographic  projection
        // Center(0, 20) and 45 degree rotation w.r.t Y axis
        var gfg = d3.geoCylindricalStereographic()
            .scale(width / 2.0 / Math.PI)
            .rotate([45, 0])
            .center([0, 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", "grey")
                    .attr("d", d3.geoPath()
                        .projection(gfg)
                    )
                    .style("stroke", "#ffff")
    </script>
</body>
  
</html>

Output:

CylindricalEqualArea projection with  45 degree rotation w.r.t  Y axis  and centered at (0, 20)

Hey geek! The constant emerging technologies in the world of web development always keeps the excitement for this subject through the roof. But before you tackle the big projects, we suggest you start by learning the basics. Kickstart your web development journey by learning JS concepts with our JavaScript Course. Now at it’s lowest price ever!




My Personal Notes arrow_drop_up
Recommended Articles
Page :