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 geoLarrivee() function in d3.js is used to draw The Larrivée projection.
Syntax:
d3.geoLarrivee()
Parameters: This method does not accept any parameters.
Returns: This method creates The Larrivée projection from given json data.
Example 1: The following example draws Larrivee 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 src= </script> <script> var svg = d3.select("svg"), width = +svg.attr("width"), height = +svg.attr("height"); // Larrivee projection // Center(0, 0) with 0 rotation var gfg = d3.geoLarrivee() .scale(width / 2.8 / 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:
Larrivee projection of World with no rotation and centered at (0, 0)
Example 2: The following example draws Larrivee 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 src= </script> <script> var svg = d3.select("svg"), width = +svg.attr("width"), height = +svg.attr("height"); // Larrivee projection // Center(0, 20) and 60 degree // rotation w.r.t Y axis var gfg = d3.geoLarrivee() .scale(width / 2.5 / Math.PI) .rotate([60, 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:
Larrivee projection with 60 degree rotation w.r.t Y axis and centered at (0, 20)
