d3.js color.brighter()用法及代码示例

D3.js 的 color.brighter() 函数用于复制在原始颜色中具有一些额外亮度或暗度的颜色。

用法:

color.brighter(k)

参数：这个函数只接受一个参数 k 是原始颜色所需的亮度量。它是整数值。

返回值：它返回对象。

范例1：当没有给出k的值时

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 color.brighter() Function</title>
    </head>
    <style>
        .box {
            height:100px;
            width:100px;
        }
        .box1 {
            height:100px;
            width:100px;
        }
    </style>
    <body>
        Color without color.brighter() property
        <div class="box"></div>
        Color with color.brighter() property
        <div class="box1"></div>
        <!--fetching from CDN of D3.js -->
        <script type="text/javascript" src=
                "https://d3js.org/d3.v4.min.js">
        </script>
        <script>
            let box = document.querySelector(".box");
            let box1 = document.querySelector(".box1");
            var color = d3.color("green");
            box.style.backgroundColor = 
              `rgb(${color.r},${color.g},${color.b})`;
            var color = color.brighter();
            box1.style.backgroundColor = 
              `rgb(${color.r},${color.g},${color.b})`;
        </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 color.brighter() Function</title>
    </head>
    <style>
        .box {
            height:100px;
            width:100px;
        }
        .box1 {
            height:100px;
            width:100px;
        }
    </style>
    <body>
        Color without color.brighter() property
        <div class="box"></div>
        Color with color.brighter(10) property
        <div class="box1"></div>
        <!--fetching from CDN of D3.js -->
        <script type="text/javascript" src=
                "https://d3js.org/d3.v4.min.js">
        </script>
        <script>
            let box = document.querySelector(".box");
            let box1 = document.querySelector(".box1");
            var color = d3.color("green");
            box.style.backgroundColor = 
              `rgb(${color.r},${color.g},${color.b})`;
            var color = color.brighter(10);
            box1.style.backgroundColor = 
              `rgb(${color.r},${color.g},${color.b})`;
        </script>
    </body>
</html>

输出：

范例3：当 k < 0 时

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 color.brighter() Function</title>
    </head>
    <style>
        .box {
            height:100px;
            width:100px;
        }
        .box1 {
            height:100px;
            width:100px;
        }
    </style>
    <body>
        Color without color.brighter() property
        <div class="box"></div>
        Color with color.brighter(-10) property
        <div class="box1"></div>
        <!--fetching from CDN of D3.js -->
        <script type="text/javascript" src=
                "https://d3js.org/d3.v4.min.js">
        </script>
        <script>
            let box = document.querySelector(".box");
            let box1 = document.querySelector(".box1");
            var color = d3.color("green");
            box.style.backgroundColor = 
              `rgb(${color.r},${color.g},${color.b})`;
            var color = color.brighter(-10);
            box1.style.backgroundColor =
              `rgb(${color.r},${color.g},${color.b})`;
        </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 color.brighter() 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。