d3.js pie.value()用法及代碼示例

pie.value()函數用於設置餅圖生成器函數返回的數據的value屬性。如果指定了值，則它將值設置為給定的動態或靜態函數或數字。

用法:

pie.value([value]);

參數：該函數接受如上所述和以下描述的單個參數。

value:該參數采用一個函數或一個數字。

返回值：此函數不返回任何內容。

範例1：

HTML

<!DOCTYPE html> 
<html lang="en"> 
  
<head> 
    <meta charset="UTF-8" /> 
    <meta property="viewport" content= 
        "width=device-width,initial-scale=1.0"/> 
  
    <!--Fetching from CDN of D3.js -->
    <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.value() 
            </h2> 
            <h3> 
                When given data array  
                consists objects 
            </h3> 
        </center> 
        <svg width="300" height="300"> 
        </svg> 
    </div> 
      
    <script> 
        // Data to be added in the pie chart 
        var data = [ 
            { "value":1, "property":"p1" }, 
            { "value":2, "property":"p2" }, 
            { "value":3, "property":"p3" }, 
            { "value":4, "property":"p4" }, 
            { "value":5, "property":"p5" }, 
            { "value":6, "property":"p6" } 
        ] 
  
        // Selecting SVG using d3.select() 
        var svg = d3.select("svg"); 
  
        // Creating Pie generator 
        var pie = d3.pie() 
            // Use of pie.value() Function 
            .value((d) => { return d.value }); 
  
        // Creating arc 
        var arc = d3.arc() 
            .innerRadius(0) 
            .outerRadius(100); 
  
        let g = svg.append("g") 
            .attr("transform", "translate(150, 120)"); 
  
        // Grouping different arcs 
        var arcs = g.selectAll("arc") 
            .data(pie(data)) 
            .enter() 
            .append("g"); 
  
        // Appending path  
        arcs.append("path") 
            .attr("fill", (data, i) => { 
                return d3.schemeSet2[i]; 
            }) 
            .attr("d", arc); 
    </script> 
</body> 
  
</html>

輸出：

範例2：

HTML

<!DOCTYPE html> 
<html lang="en"> 
  
<head> 
    <meta charset="UTF-8" /> 
    <meta property="viewport" content= 
        "width=device-width, initial-scale=1.0"/> 
    <!--Fetching from CDN of D3.js -->
    <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.value() 
            </h2> 
            <h3> 
                When given data array  
                consists objects 
            </h3> 
        </center> 
        <svg width="300" height="300"> 
        </svg> 
    </div> 
    <script> 
        // Data to be added in the pie chart 
        var data = [ 
            { "value":1, "property":"p1" }, 
            { "value":2, "property":"p2" }, 
            { "value":3, "property":"p3" }, 
            { "value":4, "property":"p4" }, 
            { "value":5, "property":"p5" }, 
            { "value":6, "property":"p6" } 
        ] 
  
        // Selecting SVG using d3.select() 
        var svg = d3.select("svg"); 
  
        // Creating Pie generator 
        var pie = d3.pie() 
            // Use of pie.value() Function 
            .value((d) => { return d.value }) 
            (data); 
  
        // Creating arc 
        var arc = d3.arc() 
            .innerRadius(50) 
            .outerRadius(100); 
  
        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.schemeSet2[i]; 
            }) 
            .attr("d", arc); 
  
        arcs.append("text") 
            .attr("transform", (d) => { 
                return "translate(" + 
                    arc.centroid(d) + ")"; 
            }) 
            .text(function (d) { 
                return d.value; 
            }); 
    </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.value() 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。