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 geoVanDerGrinten4() function in d3.js is used to draw The Van der Grinten IV projection.
Syntax:
d3.geoVanDerGrinten4()
Parameters: This method does not accept any parameters.
Return Value: This method creates geoVanDerGrinten IV projection from given JSON data.
Example 1: The following example draws Van Der Grinten IV projection of the world with the 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" /> </script> <script src= </script> </head> <body> <div style="width:700px; height:600px;"> <svg width="700" height="400"> </svg> </div> <script> var svg = d3.select("svg"), width = +svg.attr("width"), height = +svg.attr("height"); // VanDerGrinten4 projection // Center(0,0) and 0 rotation var gfg = d3.geoVanDerGrinten4() .scale(width / 3.0 / Math.PI) .rotate([0, 0]) .center([0, 0]) .translate([width / 2, height / 2]) // Loading the json data d3.json( + "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:
VanDerGrinten4 projection of World with no rotation and centered at (0,0)
Example 2: The following example draws VanDerGrinten IV projection of the 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" /> </script> <script src= </script> </head> <body> <div style="width:700px; height:600px;"> <svg width="700" height="400"> </svg> </div> <script> var svg = d3.select("svg"), width = +svg.attr("width"), height = +svg.attr("height"); // VanDerGrinten4 projection // Center(10,10) and 25 degree // rotation w.r.t Y axis var gfg = d3.geoVanDerGrinten4() .scale(width / 3.0 / Math.PI) .rotate([25, 0]) .center([10, 10]) .translate([width / 2, height / 2]) // Loading the json data // Used json file stored at // /datageojson/master/world.json d3.json( + "janasayantan/datageojson/master/world.json", function (data) { // Draw 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:
VanDerGrinten4 projection with 25-degree rotation w.r.t Y-axis and centered at (10,10)
