d3.js interpolateCubehelix()用法及代码示例

D3.js中的d3.interpolateCubehelix()函数用于返回cubehelix颜色空间插值器函数。它采用两种颜色作为参数。

用法:

d3.interpolateCubehelix(a, b);

或者

d3.interpolateCubehelix.gamma(k)(a, b);

参数：它有两个参数。

a：它是数据类型字符串颜色的名称。
b：它也是字符串类型的颜色的名称。

返回值：它返回内插器函数。

下面给出了上述函数的一些示例。

范例1：

<!DOCTYPE html> 
<html lang="en"> 
<head> 
  <meta charset="UTF-8"> 
  <meta name="viewport" 
        content="width=device-width,  
                 initial-scale=1.0"> 
  <title>Document</title> 
</head> 
<style> 
</style> 
<body> 
  <!--fetching from CDN of D3.js -->
  <script type = "text/javascript" 
          src = "https://d3js.org/d3.v4.min.js"> 
  </script> 
  <script> 
    // Printing the return type of the function 
    console.log( 
"function type is:", typeof(d3.interpolateCubehelix("blue", "white"))) 
    // Using function d3.interpolateCubehelix() 
    console.log( 
"A RGB string:", d3.interpolateCubehelix("blue", "white")(0.5)) 
    //using gamma 
    console.log( 
"A RGB string", d3.interpolateCubehelix.gamma(2)("blue", "white")(0.2)) 
  </script> 
</body> 
</html>

输出：

范例2：

<!DOCTYPE html> 
<html lang="en"> 
<head> 
  <meta charset="UTF-8"> 
  <meta name="viewport" 
        content="width=device-width,  
                 initial-scale=1.0"> 
  <title>Document</title> 
</head> 
<style> 
  .box1, .box2{ 
    display:flex; 
    margin-bottom:40px; 
    color:white; 
    border:2px solid black; 
    width:fit-content; 
    height:150px; 
  } 
</style> 
<body> 
  D3.interpolateCubehelix() 
  <div> 
    <div class="box1"> 
d3.interpolateCubehelix.gamma(10)("green", "white")(0.5) 
    </div> 
    <div class="box2"> 
d3.interpolateCubehelix("green", "white")(0.5) 
    </div> 
  </div> 
  <!--fetching from CDN of D3.js -->
  <script type = "text/javascript" 
          src = "https://d3js.org/d3.v4.min.js"> 
  </script> 
  <script> 
    let box1=document.querySelector(".box1"); 
    let box2=document.querySelector(".box2"); 
    // Please note the effect of gamma 
    let color= 
d3.interpolateCubehelix.gamma(10)("green", "white")(0.5); 
    let color2= 
d3.interpolateCubehelix("green", "white")(0.5);  
    // Changing css of the div with class-name box1 
    box1.style.backgroundColor=color; 
    // Changing css of the div with class-name box2 
    box2.style.backgroundColor=color2; 
  </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 interpolateCubehelix() 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。