D3.js ribbon.startAngle() Function

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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"> 
    <script src="https://d3js.org/d3.v4.js"></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", 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 src= "https://d3js.org/d3-color.v1.min.js"> 
    </script>   
    <script src=  
        "https://d3js.org/d3-interpolate.v1.min.js"> 
    </script>   
    <script src=  
        "https://d3js.org/d3-scale-chromatic.v1.min.js"> 
    </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:

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