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= </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= </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)
