D3.js geoRectangularPolyconic() Function
Last Updated :
15 Oct, 2020
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 =
</ 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 =
</ 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:
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