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d3.js schemePRGn[]用法及代码示例


d3.schemePRGn []函数是d3.js中发散配色方案的一部分，用于返回对应于“BrBG”发散配色方案中的颜色的十六进制代码颜色字符串。

用法:

d3.schemePRGn[k];

参数：该函数接受如上所述和以下描述的单个参数：

  • k:它是[3，10]范围内的任何数字。

返回值：此函数返回一个十六进制代码颜色字符串。

以下示例说明了D3.js中的d3.schemePRGn []函数：



范例1：

HTML

<!DOCTYPE html> 
<html lang="en"> 
  
<head> 
    <meta charset="UTF-8" /> 
    <meta name="viewport" path1tent="width=device-width,  
        initial-scale=1.0" /> 
    <script src="https://d3js.org/d3.v4.min.js"> 
    </script> 
    <script src="https://d3js.org/d3-color.v1.min.js"> 
    </script> 
    <script src= 
    "https://d3js.org/d3-interpolate.v1.min.js"> 
    </script> 
    <script src= 
    "https://d3js.org/d3-scale-chromatic.v1.min.js"> 
    </script> 
</head> 
  
<body> 
    <h2 style="color:green">Geeks for geeks</h2> 
    <p style="line-height:1px"> 
        Different colors from schemePRGn are:  
    </p> 
  
    <script> 
        document.write("<p><b>"  
            + d3.schemePRGn[10][0] + "</p></b>"); 
        document.write("<p><b>"  
            + d3.schemePRGn[10][1] + "</p></b>"); 
        document.write("<p><b>"  
            + d3.schemePRGn[10][2] + "</p></b>"); 
        document.write("<p><b>"  
            + d3.schemePRGn[10][3] + "</p></b>"); 
        document.write("<p><b>"  
            + d3.schemePRGn[10][4] + "</p></b>"); 
        document.write("<p><b>"  
            + d3.schemePRGn[10][5] + "</p></b>"); 
        document.write("<p><b>"  
            + d3.schemePRGn[10][6] + "</p></b>"); 
        document.write("<p><b>"  
            + d3.schemePRGn[10][7] + "</p></b>"); 
        document.write("<p><b>"  
            + d3.schemePRGn[10][8] + "</p></b>"); 
        document.write("<p><b>"  
            + d3.schemePRGn[10][9] + "</p></b>");  
    </script> 
</body> 
  
</html>

输出：

范例2：

HTML

<!DOCTYPE html> 
<html lang="en"> 
  
<head> 
    <meta charset="UTF-8"> 
    <meta name="viewport" content="width=device-width,  
                initial-scale=1.0"> 
    <!--Fetching from CDN of D3.js -->
    <script src="https://d3js.org/d3.v4.min.js"> 
    </script> 
    <script src="https://d3js.org/d3-color.v1.min.js"> 
    </script> 
    <script src= 
    "https://d3js.org/d3-interpolate.v1.min.js"> 
    </script> 
    <script src= 
    "https://d3js.org/d3-scale-chromatic.v1.min.js"> 
    </script> 
  
    <style> 
        div { 
            padding:6px; 
            text-align:center; 
            vertical-align:middle; 
            display:flex; 
            justify-content:center; 
            width:fit-content; 
            margin-top:2px; 
            height:20px; 
        } 
    </style> 
</head> 
  
<body> 
    <h2>D3.schemePRGn[k] </h2> 
    <div class="box1"> 
        <span>d3.schemePRGn[10][0]</span> 
    </div> 
    <div class="box2"> 
        <span>d3.schemePRGn[10][1]</span> 
    </div> 
    <div class="box3"> 
        <span>d3.schemePRGn[10][2]</span> 
    </div> 
    <div class="box4"> 
        <span>d3.schemePRGn[10][3]</span> 
    </div> 
    <div class="box5"> 
        <span>d3.schemePRGn[10][4]</span> 
    </div> 
      
    <script> 
        // creating different colors  
        // for different value of k 
        let color1 = 
            d3.schemePRGn[10][0]; 
        let color2 = 
            d3.schemePRGn[10][1]; 
        let color3 = 
            d3.schemePRGn[10][2]; 
        let color4 = 
            d3.schemePRGn[10][3]; 
        let color5 = 
            d3.schemePRGn[10][4]; 
  
        // Selecting Div using query selector. 
        let box1 = document.querySelector(".box1"); 
        let box2 = document.querySelector(".box2"); 
        let box3 = document.querySelector(".box3"); 
        let box4 = document.querySelector(".box4"); 
        let box5 = document.querySelector(".box5"); 
  
        // Setting style and BG color of  
        // the particular DIVs 
        box1.style.backgroundColor = color1; 
        box2.style.backgroundColor = color2; 
        box3.style.backgroundColor = color3; 
        box4.style.backgroundColor = color4; 
        box5.style.backgroundColor = color5; 
    </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 schemePRGn[] 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。