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有关svg的一些理解

时间:2019-01-25 18:46:46      阅读:227      评论:0      收藏:0      [点我收藏+]

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 SVG 是使用XML来描述二维图形和绘图程序的语言。

  • SVG指可伸缩的矢量图形(Scalable Vector Graphics)
  • SVG使用XML格式定义图形
  • SVG图形在放大或改变尺寸的情况下,图形质量不会有损失
  • SVG可以在任何分辨率下被高质量打印
  • SVG可以直接被当做记事本文档来打开,修改,由于其内部数据可以直接被搜索修改,很适合制作地图
  • SVG与JPEG和GIF图像比起来,尺寸更小,可压缩性更强
  • SVG可以与java技术一起运行
  • SVG可以直接内嵌于html
  • 可以直接网上搜索SVG与png等相互转化的工具。

先来看一个网上使用的例子:

样式:

 技术分享图片

源码(源码可以直接粘贴到html文件,用浏览器打开):

技术分享图片
<html>
 <head></head>
 <body>
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 接下来看简单的示例:

 

样式 源码
技术分享图片

 

 <?xml version="1.0" standalone="no"?>

<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">

<svg width="100%" height="100%" version="1.1" xmlns="http://www.w3.org/2000/svg">

<circle cx="100" cy="50" r="40" stroke="black" stroke-width="2" fill="red"/>

</svg>

  第一行包含了 XML 声明。请注意 standalone 属性!该属性规定此 SVG 文件是否是“独立的”,或含有对外部文件的引用。standalone="no" 意味着 SVG 文档会引用一个外部文件 - 在这里,是 DTD 文件。

  第二和第三行引用了这个外部的 SVG DTD。该 DTD 位于 “http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd”。该 DTD 位于 W3C,含有所有允许的 SVG 元素。

  SVG 代码以 <svg> 元素开始,包括开启标签 <svg> 和关闭标签 </svg> 。这是根元素。width 和 height 属性可设置此 SVG 文档的宽度和高度。version 属性可定义所使用的 SVG 版本,xmlns 属性可定义 SVG 命名空间。

  SVG 的 <circle> 用来创建一个圆。cx 和 cy 属性定义圆中心的 x 和 y 坐标。如果忽略这两个属性,那么圆点会被设置为 (0, 0)。r 属性定义圆的半径。

  stroke 和 stroke-width 属性控制如何显示形状的轮廓。我们把圆的轮廓设置为 2px 宽,黑边框。

  fill 属性设置形状内的颜色。我们把填充颜色设置为红色。

  关闭标签的作用是关闭 SVG 元素和文档本身。

有关svg的一些理解

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原文地址:https://www.cnblogs.com/the-wang/p/10320888.html

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