CSS 3或svg波在背景中 [英] CSS 3 or svg wave in a background

问题描述

如何在透明图像背景上创建wave？

布局图像：

img src =https://i.stack.imgur.com/ajZmC.jpgalt =CSS wave>

我需要白色波浪背景。

解决方案

我略微改进了akshay的答案。

如果长宽比不支持'

t必须保留，则曲线将随宽度变化。

http://jsfiddle.net/f6n73avk/2 /

 < svg version =1.1xmlns =http://www.w3.org/ 2000 / svgheight =100width =100％viewBox =0 0 90 20preserveAspectRatio =none> 
< path d =M0 5 H5 C25 5 25 20 45 20 S65 5 85 5 H90 V-5 H0zfill =blackstroke =transparent/> 
< / svg> 
  

选项2

如果必须保留宽高比，则必须对svg元素的高度和宽度使用相同的单位值。

http：//jsfiddle.net/o1eghm7v/1/

 < svg version =1.1xmlns =http://www.w3.org/2000/svgheight =100％width =100％viewBox =0 0 90 20> 
< path d =M0 5 H5 C25 5 25 20 45 20 S65 5 85 5 H90 V-5 H0zfill =blackstroke =transparent/> 
< / svg> 
  

看到这里我使用的宽度和高度都为100％。要更改颜色，您必须更改填充属性的值。

此外，我已使用绝对路径命令

M

strong> - 命令将绘图点移动到其后指定的坐标，或0,5（SVG坐标系）

H 线到当前点（0,5）的指定X坐标

C 绘制立方贝塞尔曲线，将第一个点坐标作为第一个句柄，第二个第二手柄，第三个是终点。

S 绘制一个三次贝塞尔曲线，但其第一个句柄是上一个C命令的最后一个句柄

V 绘制垂直线到指定的Y坐标。

Z 关闭路径，即绘制从当前点到最后M点的直线。

How can I build a wave on a transparent image background ?

Layout-Image:

I need the wave in the white top background.

解决方案

I slightly improved version of akshay's answer. This includes two separate options.

OPTION 1

If aspect ratio doesn't have to be preserved, then the curve will change with width.

http://jsfiddle.net/f6n73avk/2/

<svg version="1.1" xmlns="http://www.w3.org/2000/svg" height="100" width="100%" viewBox="0 0 90 20" preserveAspectRatio="none">
    <path d="M0 5 H5 C25 5 25 20 45 20 S65 5 85 5 H90 V-5 H0z" fill="black" stroke="transparent"/>
</svg>

OPTION 2

If the aspect ratio has to be preserved, then we have to use same units value for height and width of svg element.

http://jsfiddle.net/o1eghm7v/1/

<svg version="1.1" xmlns="http://www.w3.org/2000/svg" height="100%" width="100%" viewBox="0 0 90 20" >
    <path d="M0 5 H5 C25 5 25 20 45 20 S65 5 85 5 H90 V-5 H0z" fill="black" stroke="transparent"/>
</svg>

See here I used width and height both as 100%. To change the colour you have to change the value of fill attribute.
Also, I have used absolute path commands as they are simpler to edit.

Explanation

M - command moves the drawing point to the the coordinates specified after it, or 0,5 (SVG coordinate system)

H draws Horizontal line to specified X-coordinate from the current point (0,5)

C draws cubic bezier, with first point coords as first handle, second second handle, and third is the end point.

S draws a cubic bezier, but its first handle is the reflection of the last handle of last C command about the end point of last C.

V draws vertical line to specified Y-coordinate.

Z closes the path, ie draws a straight line from current point to last M point.

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