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OKCCN - XenForo & IPS Plugin Marketplace

主屏幕上的全屏APP,带有推送通知、徽章等。

在iOS和iPadOS上安装此APP
  1. 在Safari中轻敲分享图标
  2. 滚动菜单并轻敲添加到主屏幕
  3. 轻敲右上角的添加按钮。
在安卓上安装此APP
  1. 轻敲浏览器右上角的三个点菜单 (⋮) 。
  2. 轻敲添加到主屏幕安装APP
  3. 轻敲安装进行确认。
  • 选择语言

HTML SVG Graphics

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HTML SVG Graphics


SVG (Scalable Vector Graphics)

SVG defines vector-based graphics in XML, which can be directly embedded in HTML pages.

SVG graphics are scalable, and do not lose any quality if they are zoomed or resized:

SVG is supported by all major browsers.


What is SVG?

  • SVG stands for Scalable Vector Graphics
  • SVG is used to define vector-based graphics for the Web
  • SVG defines graphics in XML format
  • Each element and attribute in SVG files can be animated
  • SVG is a W3C recommendation
  • SVG integrates with other standards, such as CSS, DOM, XSL and JavaScript

The <svg> Element

The HTML <svg> element is a container for SVG graphics.

SVG has several methods for drawing paths, rectangles, circles, polygons, text, and much more.


SVG Circle

Example

<!DOCTYPE html>
<html>
<body>

<svg width="100" height="100">
  <circle cx="50" cy="50" r="40" stroke="green" stroke-width="4" fill="yellow" />
</svg>

</body>
</html>


SVG Rectangle

Example

<svg width="400" height="120">
  <rect x="10" y="10" width="200" height="100" stroke="red" stroke-width="6" fill="blue" />
</svg>

SVG Rectangle with Opacity and Rounded Corners

Example

<svg width="400" height="180">
  <rect x="50" y="20" rx="20" ry="20" width="150" height="150"
  style="fill:red;stroke:black;stroke-width:5;opacity:0.5" />
</svg>

SVG Star

Example

<svg width="300" height="200">
  <polygon points="100,10 40,198 190,78 10,78 160,198"
  style="fill:lime;stroke:purple;stroke-width:5;fill-rule:evenodd;" />
</svg>

SVG Gradient Ellipse and Text

Example

<svg height="130" width="500">
  <defs>
    <linearGradient id="grad1">
      <stop offset="0%" stop-color="yellow" />
      <stop offset="100%" stop-color="red" />
    </linearGradient>
  </defs>
  <ellipse cx="100" cy="70" rx="85" ry="55" fill="url(#grad1)" />
  <text fill="#ffffff" font-size="45" font-family="Verdana" x="50" y="86">SVG</text>
  Sorry, your browser does not support inline SVG.
</svg>

Differences Between SVG and Canvas

SVG is a language for describing 2D graphics in XML, while Canvas draws 2D graphics, on the fly (with JavaScript).

SVG is XML based, which means that every element is available within the SVG DOM. You can attach JavaScript event handlers to SVG graphics.

In SVG, each drawn shape is remembered as an object. If attributes of an SVG object are changed, the browser can automatically re-render the shape.

Canvas is rendered pixel by pixel. In canvas, once the graphic is drawn, it is forgotten by the browser. If its position should be changed, the entire scene needs to be redrawn, including any objects that might have been covered by the graphic.


Comparison of SVG and Canvas

The table below shows some important differences between Canvas and SVG:

SVG Canvas
  • Resolution independent
  • Support for event handlers
  • Good text rendering capabilities
  • Slow rendering if complex
  • Not suited for game applications
  • Resolution dependent
  • No support for event handlers
  • Poor text rendering capabilities
  • You can save the resulting image as .png or .jpg
  • Well suited for graphic-intensive games

SVG Tutorial

To learn more about SVG, please read our SVG Tutorial.


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配置浏览器推送通知

Chrome (安卓)
  1. 轻敲地址栏旁的锁形图标。
  2. 轻敲权限 → 通知。
  3. 调整你的偏好。
Chrome (台式电脑)
  1. 点击地址栏中的挂锁图标。
  2. 选择网站设置。
  3. 找到通知选项并调整你的偏好。