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d3.js interpolateRdYlGn()用法及代码示例


D3.js中的d3.interpolateRdYlGn()函数用于从RdYlGn的发色方案中返回相应的颜色，其中Rd为红色，Yl为黄色，Gn为绿色。

用法:

d3.interpolateRdYlGn(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：此函数返回RGB颜色字符串。

以下示例说明了JavaScript中的D3.js interpolateRdYlGn()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 interpolateRdYlGn() 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.interpolateRdYlGn(0)); 
            console.log(d3.interpolateRdYlGn(0.12)); 
            console.log(d3.interpolateRdYlGn(0.24)); 
            console.log(d3.interpolateRdYlGn(0.354)); 
            console.log(d3.interpolateRdYlGn(0.45)); 
            console.log(d3.interpolateRdYlGn(0.52)); 
            console.log(d3.interpolateRdYlGn(0.61)); 
            console.log(d3.interpolateRdYlGn(0.74)); 
            console.log(d3.interpolateRdYlGn(0.8)); 
            console.log(d3.interpolateRdYlGn(0.92)); 
            console.log(d3.interpolateRdYlGn(1.0)); 
        </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 interpolateRdYlGn() 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.interpolateRdYlGn()</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> 
        <div class="b6"> 
            <span> 
                (0.6) 
            </span> 
        </div> 
        <div class="b7"> 
            <span> 
                (0.7) 
            </span> 
        </div> 
        <div class="b8"> 
            <span> 
                (0.8) 
            </span> 
        </div> 
        <div class="b9"> 
            <span> 
                (0.9) 
            </span> 
        </div> 
        <div class="b10"> 
            <span style="color:honeydew;"> 
                (1.0) 
            </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.interpolateRdYlGn(0.1); 
            let color2 = d3.interpolateRdYlGn(0.2); 
            let color3 = d3.interpolateRdYlGn(0.3); 
            let color4 = d3.interpolateRdYlGn(0.4); 
            let color5 = d3.interpolateRdYlGn(0.5); 
            let color6 = d3.interpolateRdYlGn(0.6); 
            let color7 = d3.interpolateRdYlGn(0.7); 
            let color8 = d3.interpolateRdYlGn(0.8); 
            let color9 = d3.interpolateRdYlGn(0.9); 
            let color10 = d3.interpolateRdYlGn(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"); 
            let b6 = document.querySelector(".b6"); 
            let b7 = document.querySelector(".b7"); 
            let b8 = document.querySelector(".b8"); 
            let b9 = document.querySelector(".b9"); 
            let b10 = document.querySelector(".b10"); 
  
            // 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; 
            b6.style.backgroundColor = color6; 
            b7.style.backgroundColor = color7; 
            b8.style.backgroundColor = color8; 
            b9.style.backgroundColor = color9; 
            b10.style.backgroundColor = color10; 
        </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 interpolateRdYlGn() 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。