d3.js interpolateYlOrRd()用法及代码示例

d3.js中的d3.interpolateYlOrRd()函数用于从“YlOrRd”的不同配色方案中返回RGB颜色字符串。

用法:

d3.interpolateYlOrRd(t);

参数：该函数接受如上所述和以下描述的单个参数：

t:它是一个数值，范围为[0,1]。

返回值：此函数返回RGB颜色字符串。

以下示例说明了JavaScript中的D3.js interpolateYlOrRd()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 interpolateYlOrRd() 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.interpolateYlOrRd(0.14)); 
            console.log(d3.interpolateYlOrRd(0.4)); 
            console.log(d3.interpolateYlOrRd(0.2)); 
            console.log(d3.interpolateYlOrRd(0.25)); 
            console.log(d3.interpolateYlOrRd(0.54)); 
            console.log(d3.interpolateYlOrRd(0.85)); 
            console.log(d3.interpolateYlOrRd(2)); 
            console.log(d3.interpolateYlOrRd(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>Document</title> 
    </head> 
    <style> 
        div { 
            padding:6px; 
            text-align:center; 
            vertical-align:middle; 
            display:flex; 
            justify-content:center; 
            width:90px; 
            height:50px; 
            float:left; 
        } 
    </style> 
    <body> 
        <h2>D3.interpolateYlOrRd()</h2> 
        <div class="box1"> 
            <span> </span> 
        </div> 
        <div class="box2"> 
            <span> </span> 
        </div> 
        <div class="box3"> 
            <span> </span> 
        </div> 
        <div class="box4"> 
            <span> </span> 
        </div> 
        <div class="box5"> 
            <span> </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 is 0.1 
            let color1 = d3.interpolateYlOrRd(0.1); 
            // Values of t is 0.3 
            let color2 = d3.interpolateYlOrRd(0.3); 
            // Values of t is 0.5 
            let color3 = d3.interpolateYlOrRd(0.5); 
            // Values of t is 0.8 
            let color4 = d3.interpolateYlOrRd(0.8); 
            // Values of t is 1.0 
            let color5 = d3.interpolateYlOrRd(1.0); 
  
            // 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 interpolateYlOrRd() 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。