Open In App

D3.js geoRectangularPolyconic() Function

Improve
Improve
Like Article
Like
Save
Share
Report

The JavaScript D3.js library provides interactive data visualizations for web pages using HTML5, Scalable Vector Graphics, and Cascading Style Sheets. The geoRectangularPolyconic() function of JavaScript d3.js library is used to draw the rectangular polyconic projection.

Syntax:

d3.geoRectangularPolyconic()

Parameters: This method does not accept any parameters.

Return Value: This method creates the rectangular polyconic projection from the given JSON data.

Example 1: The following example creates rectangular polyconic projection of world with center at (0, 0) and with no 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="https://d3js.org/d3.v4.js"></script
    <script src
    </script
</head
  
<body
    <div style="width:700px; height:500px;"
        <center
            <h3 style="color:black"></h3
    </center
    <svg width="600" height="450"
    </svg
    </div
  
    <script
  
    var svg = d3.select("svg"), 
    width = +svg.attr("width"), 
    height = +svg.attr("height"); 
  
    // RectangularPolyconic projection 
    // Center(0, 0) with 0 rotation 
    var gfg = d3.geoRectangularPolyconic() 
                .scale(width / 1.8 / 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 
    + "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:

Example 2: In the following example, we will create Patterson projection of world with center at (0, -20) and rotating 30 degree with respect to Y axis.

HTML




<!DOCTYPE html> 
<html lang="en"
  
<head
    <meta charset="UTF-8" /> 
    <meta name="viewport"
        content="width=device-width, 
                initial-scale=1.0"/> 
    <script src="https://d3js.org/d3.v4.js"></script
    <script src
    </script
</head
  
<body
    <div style="width:700px; height:500px;"
        <center
            <h3 style="color:black"></h3
       </center
    <svg width="600" height="450"
    </svg
    </div
  
    <script
  
     var svg = d3.select("svg"), 
     width = +svg.attr("width"), 
     height = +svg.attr("height"); 
  
    // RectangularPolyconic  projection  
    // Center(0, -20) and 30 degree 
    // rotation w.r.t Y axis  
    var gfg = d3.geoRectangularPolyconic() 
                .scale(width / 2.3 / Math.PI) 
                .rotate([0, 30]) 
                .center([0, -20]) 
                .translate([width / 2, height / 2]) 
  
    // Loading the json data 
    // Used json file stored at 
    // /datageojson/master/world.json 
      + "janasayantan/datageojson/master/world.json", 
    function(data){ 
  
        // Drawing 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:



Last Updated : 15 Oct, 2020
Like Article
Save Article
Previous
Next
Share your thoughts in the comments
Similar Reads