d3.js areaRadial.angle()用法及代碼示例

areaRadial.angle()方法用於設置或獲取角度訪問器。角度必須是數字或返回代表弧度的角度的數字的函數。

用法:

areaRadial.angle(angle);

參數：此方法接受上述和以下描述的單個參數：

angle:此參數保存的角度可以是數字，也可以是返回角度範圍的函數(0至2π)弧度。

返回值：此方法返回徑向區域的角度訪問器。

範例1：以下示例使用此方法設置角度。

HTML

<!DOCTYPE html> 
<html> 
<head> 
    <meta charset="utf-8"> 
  
    <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 | areaRadial.angle() 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]); 
  
        var Gen = d3.areaRadial() 
             // Setting the angle function 
             .angle(d => xScale(d.x*4)) 
             .innerRadius(d => yScale(d.y/6)) 
             .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：下麵的示例演示如何獲取角度函數。

HTML

<!DOCTYPE html> 
<html> 
  
<head> 
    <meta charset="utf-8"> 
    <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 | areaRadial.angle() 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]); 
  
        var Gen = d3.areaRadial() 
             // Setting the angle function 
             .angle(d => xScale(d.x*4)) 
             .innerRadius(d => yScale(d.y/6)) 
             .outerRadius(d => yScale(d.y)); 
  
        d3.select("#gfg") 
          .select("g") 
          .append("path") 
          .attr("d", Gen(points)) 
          .attr("fill", "green") 
          .attr("stroke", "black"); 
  
        console.log(Gen.angle); 
        console.log(Gen.angle()); 
    </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.angle() 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。