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Xiaoqiang’s road to HTML5 mobile development (17) – HTML5 inline SVG

黄舟Original: 2017-01-22 11:54:331276browse

1. What is SVG

Scalable vector graphics is a graphics format based on Extensible Markup Language (a subset of Standard Universal Markup Language) that is used to describe two-dimensional vector graphics. It became a W3C Recommendation on January 14, 2003 by the World Wide Web Consortium SVG.

SVG stands for Scalable Vector Graphics

SVG is used to define vector-based graphics for the web

SVG uses XML format to define graphics

SVG images will not lose their graphic quality when enlarged or changed in size

SVG is a standard of the World Wide Web Consortium

SVG is consistent with W3C standards such as DOM and XSL A whole

2. Advantages of SVG

In January 2003, SVG 1.1 was established as a W3C standard.

The organizations involved in defining SVG include: Sun Microsystems, Adobe, Apple, IBM and Kodak.

Compared with other image formats, the advantage of using SVG is:

SVG can be read and modified by many tools (such as Notepad)

SVG and JPEG Compared with GIF images, they are smaller in size and more compressible.

SVG is scalable

SVG images can be printed with high quality at any resolution

SVG can be enlarged without losing image quality

Text in SVG images is optional and searchable (great for making maps)

SVG can run with Java technology

SVG is an open standard

SVG files are pure XML

The main competitor for SVG is Flash.

Compared with Flash, the biggest advantage of SVG is that it is compatible with other standards (such as XSL and DOM). Flash is a proprietary technology that is not open source.

3. Browser support

Internet Explorer 9, Firefox, Opera, Chrome and Safari support inline SVG.

4. Embedding SVG in HTML pages

In HTML5, you can embed SVG elements directly into HTML pages:

<!DOCTYPE html>  
<html>  
    <body>  
  
        <svg xmlns="http://www.w3.org/2000/svg" version="1.1" height="190">  
            <polygon points="100,10 40,180 190,60 10,60 160,180"  
                style="fill:lime;stroke:purple;stroke-width:5;fill-rule:evenodd;" />  
        </svg>  
  
    </body>  
</html>

Xiaoqiang’s road to HTML5 mobile development (17) – HTML5 inline SVG

5. Simple and practical methods of SVG

SVG has some predefined shape elements that can be used and manipulated by developers:

Rectangle
Circle
##Ellipse
Line
Polyline

Path

Let’s look at an example of a rectangle

<!DOCTYPE html>  
<html>  
    <body>  
  
        <svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="100%" height="100%">  
            <rect x="20" y="20" width="250" height="250"  
                style="fill:blue;stroke:pink;stroke-width:5;  
                fill-opacity:0.1;stroke-opacity:0.9"/>  
        </svg>  
  
    </body>  
</html>

Xiaoqiang’s road to HTML5 mobile development (17) – HTML5 inline SVG What we used above is the tag, which can be used to create graphics with no less than three sides.

<!DOCTYPE html>  
<html>  
    <body>  
  
        <svg width="100%" height="100%" version="1.1"  
            xmlns="http://www.w3.org/2000/svg">  
  
            <polygon points="220,100 300,210 170,250"  
                style="fill:#cccccc;  
                stroke:#000000;stroke-width:1"/>  
  
        </svg>  
    </body>  
</html>

The coordinates of the three points are defined above, and then the color and fill of the line are defined. Method

Xiaoqiang’s road to HTML5 mobile development (17) – HTML5 inline SVG 6. SVG example demonstration

##Source code: Xiaoqiang’s road to HTML5 mobile development (17) – HTML5 inline SVG

<!DOCTYPE html>  
<html>  
    <body>  
    <svg width="100%" height="100%" version="1.1"  
    xmlns="http://www.w3.org/2000/svg">  
  
        <rect id="rec" x="300" y="100" width="300" height="100" style="fill:lime">   
        <animate attributeName="x" attributeType="XML" begin="0s" dur="6s" fill="freeze" from="300" to="0"/>   
        <animate attributeName="y" attributeType="XML" begin="0s" dur="6s" fill="freeze" from="100" to="0"/>   
        <animate attributeName="width" attributeType="XML" begin="0s" dur="6s" fill="freeze" from="300" to="800"/>   
        <animate attributeName="height" attributeType="XML" begin="0s" dur="6s" fill="freeze" from="100" to="300"/>   
        <animateColor attributeName="fill" attributeType="CSS" from="lime" to="red" begin="2s" dur="4s" fill="freeze"/>  
        </rect>  
  
        <g transform="translate(100,100)">   
        <text id="TextElement" x="0" y="0" style="font-family:Verdana;font-size:24; visibility:hidden"> It&#39;s SVG!  
        <set attributeName="visibility" attributeType="CSS" to="visible" begin="1s" dur="5s" fill="freeze"/>  
        <animateMotion path="M 0 0 L 100 100" begin="1s" dur="5s" fill="freeze"/>  
        <animateColor attributeName="fill" attributeType="CSS" from="red" to="blue" begin="1s" dur="5s" fill="freeze"/>   
        <animateTransform attributeName="transform" attributeType="XML" type="rotate" from="-30" to="0" begin="1s" dur="5s" fill="freeze"/>   
        <animateTransform attributeName="transform" attributeType="XML" type="scale" from="1" to="3" additive="sum" begin="1s" dur="5s" fill="freeze"/>   
        </text>   
        </g>  
  
    </svg>  
  
    </body>  
</html>

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