D3.js Ribbon.startAngle()函数

D3.js中的ribbon.startAngle()函数用于将起始角度访问器设置为指定函数并返回此ribbon 生成器。

句法：

ribbon.startAngle([angle]);

参数：此函数接受如上所述和如下所述的单个参数

• angle：此参数是设置起始角度访问器的弧度值。

返回值：此函数返回功能区生成器。

下面的程序说明了D3.js中的ribbon.startAngle()函数

示例 1：

 
 
   
 
    
    
 
   

     
        GeeksForGeeks
             
        D3.js | ribbon.startAngle() Function
        
           
        
            // 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");
         
    
 
   

输出：

示例 2：

 

         
 
    
      
    
      
    
      
    
    
 
    
 
     
        GeeksForGeeks
              
        D3.js | ribbon.startAngle() Function
        
            
        
            // 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");
         
    

    

输出：