CSS3学习之radial-gradient（径向渐变）

时间：2023-03-09 05:05:09
CSS3学习之radial-gradient（径向渐变）

转自：http://www.cnblogs.com/rainman/p/5133685.html

1、语法

径向渐变不同于线性渐变，线性渐变是从“一个方向”向“另一个方向”的颜色渐变，而径向渐变是从“一个点”向四周的颜色渐变。其语法如下：

background: radial-gradient(center, shape, size, start-color, ..., last-color);
  • center：渐变起点的位置，可以为百分比，默认是图形的正中心。
  • shape：渐变的形状，ellipse表示椭圆形，circle表示圆形。默认为ellipse，如果元素形状为正方形的元素，则ellipse和circle显示一样。
  • size：渐变的大小，即渐变到哪里停止，它有四个值。 closest-side：最近边； farthest-side：最远边； closest-corner：最近角； farthest-corner：最远角

例1：多颜色点均匀分布

div { background: radial-gradient(red, green, blue); }
以中心（50% 50%）为起点，到最远角（farthest-corner），从red到green、blue的均匀渐变，效果如下图：

CSS3学习之radial-gradient（径向渐变）

完整的代码可以写成：

div { background: -webkit-radial-gradient(50% 50%, farthest-corner, red, green, blue); }

或

div { background: -webkit-radial-gradient(center, farthest-corner, red, green, blue); }

例2：多颜色节点不均匀分布

div { background: radial-gradient(red 5%, green 15%, blue 60%); }

CSS3学习之radial-gradient（径向渐变）

例3：设置渐变形状

shape 参数定义了形状。它可以是值 circle 或 ellipse。其中，circle 表示圆形，ellipse 表示椭圆形。默认值是 ellipse。

div { background: radial-gradient(circle, red, yellow, green); }

div { background: radial-gradient(ellipse, red, yellow, green); }

CSS3学习之radial-gradient（径向渐变）

circle：渐变为最大的圆形； ellipse：根据元素形状渐变，元素为正方形是显示效果与circle无异。

例4：不同尺寸的渐变

size指定了渐变的大小，即渐变到哪里停止，它有四个值。 closest-side：最近边； farthest-side：最远边； closest-corner：最近角； farthest-corner：最远角

div { background: radial-gradient(60% 40%, closest-side, blue, green, yellow, black); }

div { background: radial-gradient(60% 40%, farthest-side, blue, green, yellow, black); }

div { background: radial-gradient(60% 40%, closest-corner, blue, green, yellow, black); }

div { background: radial-gradient(60% 40%, farthest-corner, blue, green, yellow, black); }

效果图如下，分别用“红色”描出了不同属性指定的渐变终点：

CSS3学习之radial-gradient（径向渐变）

例5：重复性渐变

repeating-radial-gradient() 函数用于重复径向渐变

div { background: repeating-radial-gradient(red, yellow 10%, green 20%); }

CSS3学习之radial-gradient（径向渐变）

例6：扩展-设置方向

 div{ width: 100px; height: 100px; background: -moz-radial-gradient(bottom left, #fff 0%, #fff 60%, green 60%, green 100%);}

aaarticlea/png;base64,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" alt="" />

随着宽、高及位置的变换可演变成：

aaarticlea/png;base64,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" alt="" />aaarticlea/png;base64,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" alt="" />aaarticlea/png;base64,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" alt="" />

相关文章