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 geoGringorten() function in d3.js is used to draw the Gringorten square equal-area projection, rearranged to give each hemisphere an entire square.
Syntax:
d3.geoGringorten()
Parameters: This method does not accept any parameters.
Return Value: This method creates Gringorten square equal-area projection. from given json data.
Example 1: The following example makes Gringorten projection of world with center at (0, 0) and no rotation.
<!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");
// Gringorten projection
// Center(0, 0) with 0 rotation
var gfg = d3.geoGringorten()
.scale(width / 1.5 / 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"
d3.json(myURL, function (data) {
// Draw the map
svg.append("g")
.selectAll("path")
.data(data.features)
.enter().append("path")
.attr("fill", "SlateBlue")
.attr("d", d3.geoPath()
.projection(gfg)
)
.style("stroke", "#ffff")
})
</script>
</body>
</html>
|
Output:
Gringorten projection with no rotation and centered at (0, 0)
Example 2: The following example makes Gringorten projection of world after customizing 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" />
<script src=
</script>
</head>
<body>
<div style="width:700px; height:600px;">
<center>
<h3 style="color:black"></h3>
</center>
<svg width="700" height="400"> </svg>
</div>
<script>
var svg = d3.select("svg"),
width = +svg.attr("width"),
height = +svg.attr("height");
// Gringorten projection
// Center(-20, 20) and 90 degree
// rotation w.r.t Y axis
var gfg = d3.geoGringorten()
.scale(width / 1.5 / Math.PI)
.rotate([90, 0])
.center([-20, 20])
.translate([width / 2, height / 2])
// Loading the json data
// Used json file stored at:
// /datageojson/master/world.json
+ "janasayantan/datageojson/master/world.json"
d3.json(myURL, function (data) {
// Draw the map
svg.append("g")
.selectAll("path")
.data(data.features)
.enter().append("path")
.attr("fill", "SlateGrey")
.attr("d", d3.geoPath()
.projection(gfg)
)
.style("stroke", "#ffff")
})
</script>
</body>
</html>
|
Output:
Gringorten projection with 90 degree rotation w.r.t Y axis and centered at (-20, 20)
Whether you're preparing for your first job interview or aiming to upskill in this ever-evolving tech landscape,
GeeksforGeeks Courses are your key to success. We provide top-quality content at affordable prices, all geared towards accelerating your growth in a time-bound manner. Join the millions we've already empowered, and we're here to do the same for you. Don't miss out -
check it out now!
Last Updated :
18 Sep, 2020
Like Article
Save Article