d3.js interpolatePurples()用法及代码示例

d3.interpolatePurples()函数是D3.js中顺序(单色调)颜色的一部分。此函数用于根据给定参数的不同值返回不同的颜色阴影。

用法:

d3.interpolatePurples(t);

参数：该函数接受如上所述和以下描述的单个参数：

t:取值范围是0到1。

返回值：它返回一个RGB字符串。

以下示例说明了JavaScript中的D3.js interpolatePurples()函数：

范例1：

HTML

<!DOCTYPE html> 
<html lang="en"> 
    <head> 
        <meta charset="UTF-8" /> 
        <meta
            name="viewport"
            content="width=device-width,  
                     initial-scale=1.0"/> 
        <title>D3.js interpolatePurples() Function</title> 
    </head> 
    <style></style> 
    <body> 
        <!--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> 
        <script> 
            console.log(d3.interpolatePurples(0)); 
            console.log(d3.interpolatePurples(0.124)); 
            console.log(d3.interpolatePurples(0.52)); 
            console.log(d3.interpolatePurples(0.42)); 
            console.log(d3.interpolatePurples(0.24)); 
            console.log(d3.interpolatePurples(0.8)); 
            console.log(d3.interpolatePurples(0.12)); 
            console.log(d3.interpolatePurples(1)); 
        </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"/> 
        <title>D3.js interpolatePurples() Function</title> 
    </head> 
    <style> 
        div { 
            padding:5px; 
            text-align:center; 
            vertical-align:middle; 
            display:flex; 
            justify-content:center; 
            width:fit-content; 
            height:50px; 
            float:left; 
        } 
    </style> 
    <body> 
        <h2>D3.interpolatePurples()</h2> 
        <div class="box1"> 
            <span> 
                (0.1) 
            </span> 
        </div> 
        <div class="box2"> 
            <span> 
                (0.2) 
            </span> 
        </div> 
        <div class="box3"> 
            <span> 
                (0.3) 
            </span> 
        </div> 
        <div class="box4"> 
            <span> 
                (0.4) 
            </span> 
        </div> 
        <div class="box5"> 
            <span> 
                (0.5) 
            </span> 
        </div> 
        <!--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> 
        <script> 
            // Creating different colors for different 
            // Values of t as 0.1,0.2... 1.0 
            let color1 = d3.interpolatePurples(0.1); 
            let color2 = d3.interpolatePurples(0.2); 
            let color3 = d3.interpolatePurples(0.3); 
            let color4 = d3.interpolatePurples(0.4); 
            let color5 = d3.interpolatePurples(0.5); 
  
            // 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 interpolatePurples() 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。