d3.js pie.startAngle()用法及代碼示例

D3.js中的pie.startAngle()函數用於設置餅圖的起始角度。指定角度後，它將起始角度設置為給定的角度或函數，並返回餅圖生成器。如果未指定角度，它將返回當前的起始角度訪問器，默認為無起始角度。

用法:

pie.startAngle( angle )

參數：該函數接受如上所述和以下描述的單個參數。

angle:它是一個數字或函數，以弧度指定起始角度。它是一個可選參數。

返回值：此函數不返回任何內容。

下麵給出了D3.js中pie.startAngle()函數的一些示例；

範例1：

HTML

<!DOCTYPE html> 
<html> 
  
<head> 
    <script src="https://d3js.org/d3.v6.min.js"> 
    </script> 
</head> 
  
<body> 
    <div style="width:300px; height:300px;"> 
        <center> 
            <h1 style="color:green"> 
                GeeksforGeeks 
            </h1> 
            <h2> 
                pie.startAngle() 
            </h2> 
        </center> 
        <svg width="300" height="250"> 
        </svg> 
    </div> 
      
    <script> 
  
        // Data to be added in the pie chart 
        var data = [ 
            { "property":"p5", "value":19 }, 
            { "property":"p5", "value":12 }, 
            { "property":"p4", "value":11 }, 
            { "property":"p3", "value":10 }, 
            { "property":"p2", "value":9 }, 
            { "property":"p1", "value":5 }, 
            { "property":"p3", "value":10 }, 
            { "property":"p2", "value":9 }, 
            { "property":"p1", "value":5 }, 
        ] 
  
        // Selecting SVG using d3.select() 
        var svg = d3.select("svg"); 
  
        // Creating Pie generator 
        var pie = d3.pie() 
            .value((d) => { return d.value }) 
            // Use of pie.startAngle() Functioon 
            .startAngle(1) 
            (data); 
        // Creating arc 
        var arc = d3.arc() 
            .innerRadius(0) 
            .outerRadius(80); 
  
        let g = svg.append("g") 
            .attr("transform", "translate(150,120)"); 
  
        // Grouping different arcs 
        var arcs = g.selectAll("arc") 
            .data(pie) 
            .enter() 
            .append("g"); 
  
        // Appending path  
        arcs.append("path") 
            .attr("fill", (data, i) => { 
                return d3.schemeSet3[i]; 
            }) 
            .attr("d", arc); 
    </script> 
</body> 
  
</html>

輸出：

範例2：

HTML

<!DOCTYPE html> 
<html> 
  
<head> 
    <script src="https://d3js.org/d3.v6.min.js"> 
    </script> 
</head> 
  
<body> 
    <div style="width:300px; height:300px;"> 
        <center> 
            <h1 style="color:green"> 
                GeeksforGeeks 
            </h1> 
            <h2> 
                pie.startAngle() 
            </h2> 
        </center> 
        <svg width="300" height="250"> 
        </svg> 
    </div> 
      
    <script> 
        // Data to be added in the pie chart 
        var data = [ 
            { "property":"p5", "value":19 }, 
            { "property":"p5", "value":12 }, 
            { "property":"p4", "value":11 }, 
            { "property":"p3", "value":10 }, 
            { "property":"p2", "value":9 }, 
            { "property":"p1", "value":5 }, 
            { "property":"p3", "value":10 }, 
            { "property":"p2", "value":9 }, 
            { "property":"p1", "value":5 }, 
        ] 
  
        // Selecting SVG using d3.select() 
        var svg = d3.select("svg"); 
  
        // Creating Pie generator 
        var pie = d3.pie() 
            .value((d) => { return d.value }) 
            // Use of pie.startAngle() Functioon 
            .startAngle(5) 
            (data); 
        // Creating arc 
        var arc = d3.arc() 
            .innerRadius(40) 
            .outerRadius(80); 
  
        let g = svg.append("g") 
            .attr("transform", "translate(150,120)"); 
  
        // Grouping different arcs 
        var arcs = g.selectAll("arc") 
            .data(pie) 
            .enter() 
            .append("g"); 
  
        // Appending path  
        arcs.append("path") 
            .attr("fill", (data, i) => { 
                return d3.schemeSet3[i]; 
            }) 
            .attr("d", arc); 
    </script> 
</body> 
  
</html>

輸出：

相關用法

注：本文由純淨天空篩選整理自tarun007大神的英文原創作品 D3.js pie.startAngle() Function。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。