d3.js areaRadial()用法及代碼示例

這個d3.areaRadial()方法在D3.js中返回具有用於創建徑向區域的默認設置的區域徑向生成器。徑向區域生成器使用角度和半徑訪問器創建區域。徑向區域始終相對於原點定位。

用法:

d3.areaRadial()

參數：此方法不接受任何參數。

返回值：此方法不返回任何值。

下麵給出了D3.js中d3.areaRadial()方法的一些示例；

範例1：

HTML

<!DOCTYPE html> 
<html> 
  
<head> 
    <script src="https://d3js.org/d3.v5.min.js"> 
    </script> 
</head> 
  
<body> 
    <h1 style="text-align:center;  
             color:green;"> 
        GeeksforGeeks 
    </h1> 
    <h3 style="text-align:center;"> 
        D3.js | d3.areaRadial() Method 
    </h3> 
    <center> 
        <svg id="gfg" width="200" height="200"> 
            <g transform="translate(100,100)"></g> 
        </svg> 
    </center> 
    <script> 
        var points = [ 
            { x:0, y:0 }, 
            { x:2, y:3 }, 
            { x:4, y:12 }, 
            { x:6, y:8 }, 
            { x:8, y:17 }, 
            { x:10, y:15 }, 
            { x:12, y:20 }]; 
  
        var xScale = d3.scaleLinear() 
            .domain([0, 6]) 
            .range([0, 2 * Math.PI]); 
        var yScale = d3.scaleLinear() 
            .domain([0, 20]) 
            .range([90, 30]); 
  
        // Use the areaRadial() method 
        // to get an area generator  
        var Gen = d3.areaRadial() 
            .angle(d => xScale(d.x)) 
            .innerRadius(d => yScale(d.y / 3)) 
            .outerRadius(d => yScale(d.y)); 
  
        d3.select("#gfg") 
            .select("g") 
            .append("path") 
            .attr("d", Gen(points)) 
            .attr("fill", "green") 
            .attr("stroke", "black"); 
    </script> 
</body> 
  
</html>

輸出：

範例2：

HTML

<!DOCTYPE html> 
<html> 
  
<head> 
    <script src="https://d3js.org/d3.v5.min.js"> 
    </script> 
</head> 
  
<body> 
    <h1 style="text-align:center; 
             color:green;"> 
        GeeksforGeeks 
    </h1> 
    <h3 style="text-align:center;"> 
        D3.js | d3.areaRadial() Method 
    </h3> 
    <center> 
        <svg id="gfg" width="500" height="500"> 
            <g transform="translate(180,180)"></g> 
        </svg> 
    </center> 
    <script> 
        var data = [ 
            { x:10, y:1 }, 
            { x:15, y:3 }, 
            { x:20, y:5 }, 
            { x:25, y:7 }, 
            { x:30, y:9 }, 
            { x:35, y:11 }, 
            { x:40, y:13 }]; 
  
        var xScale = d3.scaleLinear() 
            .domain([0, 8]) 
            .range([25, 200]); 
        var yScale = d3.scaleLinear() 
            .domain([0, 20]) 
            .range([200, 25]); 
  
        // Use the areaRadial() method 
        // to get an area generator  
        var Gen = d3.areaRadial() 
            .angle(d => xScale(d.x)) 
            .innerRadius(d => yScale(d.y / 3)) 
            .outerRadius(d => yScale(d.y)); 
  
        d3.select("#gfg") 
            .select("g") 
            .append("path") 
            .attr("d", Gen(data)) 
            .attr("fill", "green") 
            .attr("stroke", "black"); 
    </script> 
</body> 
  
</html>

輸出：

相關用法

注：本文由純淨天空篩選整理自taran910大神的英文原創作品 D3.js areaRadial() Method。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。