The ribbon.startAngle() function in D3.js is used to set the start angle accessor to the specified function and returns this ribbon generator.
Syntax:
ribbon.startAngle([angle]);
Parameters: This function accepts a single parameter as mentioned above and described below
- angle: This parameter is the radians value to set the start angle accessor.
Return Value: This function returns the ribbon generator.
Below programs illustrate the ribbon.startAngle() function in D3.js
Example 1:
<!DOCTYPE html> <html>
<head>
<meta charset="utf-8">
</head>
<body>
<center>
<h1 style="color:green;">GeeksForGeeks</h1>
<h3>D3.js | ribbon.startAngle() Function</h3>
<div id="GFG"></div>
<script>
// Create the svg area
var svg = d3.select("#GFG")
.append("svg")
.attr("width", 300)
.attr("height", 300)
.append("g")
.attr("transform", "translate(150, 150)")
// Create input data
var data = [[18, 6, 1, 4, 5, 1],
[ 0, 80, 0, 2, 34, 53],
[75, 16, 8, 0, 0, 3],
[3, 9, 9, 6, 35, 4],
[1, 0, 7, 3, 5, 1]];
// Give this matrix to d3.chord()
var chords = d3.chord()
.padAngle(0.2)
.sortSubgroups(d3.ascending)
.sortChords(d3.ascending)
(data)
var ribboon = d3.ribbon().radius(140)
// Use of ribbon.startAngle() function
.startAngle(2.2);
svg.datum(chords)
.append("g")
.selectAll("path")
.data(function (d) { return d; })
.enter()
.append("path")
.attr("d", ribboon)
.style("fill", "#57beff")
.style("stroke", "black");
</script>
</center>
</body>
</html>
|
Output:
Example 2:
<!DOCTYPE html> <html>
<head>
<meta charset="utf-8">
</script>
<script src=
</script>
<script src=
</script>
</head>
<body>
<center>
<h1 style="color:green;">GeeksForGeeks</h1>
<h3>D3.js | ribbon.startAngle() Function</h3>
<div id="GFG"></div>
<script>
// Create the svg area
var svg = d3.select("#GFG")
.append("svg")
.attr("width", 320)
.attr("height", 320)
.append("g")
.attr("transform", "translate(160, 160)")
// Create input data
var data = [[0, 249, 747, 555, 373],
[77, 0, 451, 33, 998],
[108, 809, 253, 40, 89],
[453, 592, 748, 477, 423],
[672, 66, 8, 2, 31]];
// 4 groups, so create a vector of 4 colors
var colors = [d3.schemeSet2[0], d3.schemeSet2[1],
d3.schemeSet2[2], d3.schemeSet2[3],
d3.schemeSet2[4], d3.schemeSet2[5],
d3.schemeSet2[6], d3.schemeSet2[7]];
// Give this matrix to d3.chord()
var chords = d3.chord()
.padAngle(0.175)
.sortSubgroups(d3.ascending)
(data)
var rib = d3.ribbon().radius(150)
// Use of ribbon.startAngle() function
.startAngle(0.2);
svg.datum(chords)
.append("g")
.selectAll("path")
.data(function (d) { return d; })
.enter()
.append("path")
.attr("d", rib)
.style("fill", function (d) {
return (colors[d.source.index])
})
.style("stroke", "black");
</script>
</center>
</body>
</html>
|
Output: