d3.js interpolateRainbow()用法及代碼示例

d3.interpolateRainbow()函數用於返回與d3.interpolateWarm(範圍0至0.5)和d3.interpolateCool(範圍為0.5至1.0)(包括兩端值)相對應的RGB顏色字符串，因此它在d3.js中形成了循環的less-angry彩虹色方案。

用法:

d3.interpolateRainbow(t);

參數：該函數接受上述和以下描述的單個參數：

t:整數形式，取值範圍是[0，1]。

返回值：此函數返回一串RGB顏色。

下麵給出的是上麵給出的函數的一些例子。

範例1：

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> 
</head> 
  
<body> 
    <script> 
        console.log(d3.interpolateRainbow(0.4)); 
        console.log(d3.interpolateRainbow(0.3)); 
        console.log(d3.interpolateRainbow(0.2)); 
        console.log(d3.interpolateRainbow(0.5)); 
        console.log(d3.interpolateRainbow(0.4)); 
        console.log(d3.interpolateRainbow(0.9)); 
        console.log(d3.interpolateRainbow(0.2)); 
        console.log(d3.interpolateRainbow(0)); 
    </script> 
</body> 
  
</html>

輸出：

rgb(226, 183, 47)
rgb(255, 120, 71)
rgb(254, 75, 131)
rgb(175, 240, 91)
rgb(226, 183, 47)
rgb(76, 110, 219)
rgb(254, 75, 131)
rgb(110, 64, 170)

範例2：

HTML

<!DOCTYPE html> 
<html lang="en"> 
  
<head> 
    <meta charset="UTF-8"> 
    <meta name="viewport" content= 
        "width=device-width, initial-scale=1.0"> 
  
    <style> 
        div { 
            padding:6px; 
            text-align:center; 
            vertical-align:middle; 
            display:flex; 
            justify-content:center; 
            width:90px; 
            height:50px; 
            float:left; 
        } 
    </style> 
  
    <!--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> 
</head> 
  
<body> 
    <h2>D3.interpolateRainbow() </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> 
  
    <script> 
  
        // Creating different colors for 
        // different Values of t is 0 
        let color1 = 
            d3.interpolateRainbow(0); 
  
        // Values of t is 0.1 
        let color2 = 
            d3.interpolateRainbow(0.1); 
  
        // Values of t is 0.3 
        let color3 = 
            d3.interpolateRainbow(0.3); 
  
        // Values of t is 0.5 
        let color4 = 
            d3.interpolateRainbow(0.5); 
  
        // Values of t is 0.8 
        let color5 = 
            d3.interpolateRainbow(0.8); 
  
        // 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>

輸出：

相關用法

注：本文由純淨天空篩選整理自tarun007大神的英文原創作品 D3.js interpolateRainbow() Function。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。