d3.js pie.value()用法及代码示例

pie.value()函数用于设置饼图生成器函数返回的数据的value属性。如果指定了值，则它将值设置为给定的动态或静态函数或数字。

用法:

pie.value([value]);

参数：该函数接受如上所述和以下描述的单个参数。

value:该参数采用一个函数或一个数字。

返回值：此函数不返回任何内容。

范例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>

输出：

范例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>

输出：

相关用法

注：本文由纯净天空筛选整理自tarun007大神的英文原创作品 D3.js pie.value() Function。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。