D3.js geoTimes() Function
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 geoTimes() function in d3.js is used to draw John Muir’s Times projection.
Syntax:
d3.geoTimes()
Parameters: This method does not accept any parameters.
Return Value: This method creates and returns John Muir’s Times projection from given JSON data.
Example 1: The following example draws the times 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 src= </script> <script src= </script></head> <body> <div style="width:700px; height:500px;"> <svg width="600" height="450"> </svg> </div> <script> var svg = d3.select("svg"), width = +svg.attr("width"), height = +svg.attr("height"); // Times projection // Center(0,0) with 0 rotation var gfg = d3.geoTimes() .scale(width / 1.5 / Math.PI) .rotate([0,0]) .center([0,0]) .translate([width / 2, height / 2]) // Loading the json data 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:
Times projection of World with no rotation and centered at (0,0)
Example 2: The following example draws the times 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 src= </script> <script src= </script></head> <body> <div style="width:700px; height:600px;"> <svg width="500" height="450"> </svg> </div> <script> var svg = d3.select("svg"), width = +svg.attr("width"), height = +svg.attr("height"); // Times projection // Center(-10,0) and 90 degree // rotation w.r.t Y axis var gfg = d3.geoTimes() .scale(width / 1.8 / Math.PI) .rotate([90,0]) .center([-10,0]) .translate([width / 2, height / 2]) // Loading the json data 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:
Times projection with 90-degree rotation w.r.t Y-axis and centered at (-10,0)
Please Login to comment...