The JavaScript D3.js library provides interactive data visualizations for web page using HTML5, Scalable Vector Graphics, and Cascading Style Sheets.
The geoStereographic() function in d3.js is used to draw the stereographic projection.
Syntax:
d3.geoStereographic()
Parameters: This method does not accept any parameters.
Return Value: This method creates the Stereographic projection from given JSON data.
Example 1: The following example creates Stereographic projection of world with center at (0, 0) and without 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>     <script src=     </script>     <script>         var svg = d3.select("svg"),             width = +svg.attr("width"),             height = +svg.attr("height");           // Stereographic projection         // Center(0, 0) with 0 rotation         var gfg = d3             .geoStereographic()             .scale(width / 1.5 / 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", "DarkSlateBlue")                     .attr("d", d3.geoPath().projection(gfg))                     .style("stroke", "#ffff");             });     </script> </body>   </html> |
Output:
Example 2: In following example we will create Stereographicprojection of world with center at (-10, 20) and rotating 30 degree with respect to Y axis.
<!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>     <script src=     </script>     <script>         var svg = d3.select("svg"),             width = +svg.attr("width"),             height = +svg.attr("height");           // Stereographic projection         // Center(-10, 20) and 30 degree         // rotation w.r.t Y axis         var gfg = d3             .geoStereographic()             .scale(width / 1.5 / Math.PI)             .rotate([30, 0])             .center([-10, 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", "DarkSlategrey")                     .attr("d", d3.geoPath().projection(gfg))                     .style("stroke", "#ffff");             });     </script> </body>   </html> |
Output:
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