Code for drawing SVG vector graphics using HTML5-H5 Tutorial-php.cn

Code for drawing SVG vector graphics using HTML5

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Release： 2018-06-20 10:00:35

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This article mainly introduces the introductory tutorial for using HTML5 to draw SVG vector graphics, including the introduction of basic graphics drawing and simple gradient effects. Note that the old version of IE does not support it well. Friends who need it can refer to it. Below

VG stands for Scalable Vector Graphics, which is a language used to describe 2D graphics. Graphics applications are written using XML, and then the XML is rendered by an SVG reader program.

SVG is mainly used for vector type charts, such as pie charts, two-dimensional charts in X, Y coordinate systems, etc.

SVG became a W3C recommendation on January 14, 2003. You can view the latest version of the SVG specification on the SVG Specification page.

View SVG files
Most web browsers can display SVG, just like they can display PNG, GIF, and JPG graphics. IE users may need to install Adobe SVG Reader to be able to view SVG in the browser.

Embed SVG in HTML5
HTML5 allows us to embed SVG directly using the __ tag. The following is a simple syntax:

<svg xmlns="http://www.w3.org/2000/svg">
...       
</svg>

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HTML5 - SVG Circle

Here is an HTML5 version of an SVG example, using the tag to draw a circle:

<!DOCTYPE html>
<head>
<title>SVG</title>
<meta charset="utf-8" />
</head>
<body>
<h2>HTML5 SVG Circle</h2>
<svg id="svgelem" height="200" xmlns="http://www.w3.org/2000/svg">
    <circle id="redcircle" cx="50" cy="50" r="50" fill="red" />
</svg>
</body>
</html>

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Will work in the latest version of FireFox with HTML5 enabled Produces the following result:

2016219112130340.jpg (223×186)

##HTML5 - SVG Rectangle
Here is an HTML5 version of an SVG example, using the tag Drawing a rectangle:

<!DOCTYPE html>
<head>
<title>SVG</title>
<meta charset="utf-8" />
</head>
<body>
<h2>HTML5 SVG Rectangle</h2>
<svg id="svgelem" height="200" xmlns="http://www.w3.org/2000/svg">
    <rect id="redrect" width="300" height="100" fill="red" />
</svg>
</body>
</html>

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In the latest version of FireFox with HTML5 enabled, this results:

2016219112200272.jpg (316×152)

##HTML5 - SVG Line
The following is an HTML5 version of an SVG example, using the tag to draw a line:

<!DOCTYPE html>
<head>
<title>SVG</title>
<meta charset="utf-8" />
</head>
<body>
<h2>HTML5 SVG Line</h2>
<svg id="svgelem" height="200" xmlns="http://www.w3.org/2000/svg">
    <line x1="0" y1="0" x2="200" y2="100"
          style="stroke:red;stroke-width:2"/>
</svg>
</body>
</html>

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You can use the style attribute to set additional style information for it, such as stroke, fill color, Stroke width, etc.

In the latest version of FireFox with HTML5 enabled, the following results will be generated:

2016219112220725.jpg (217×159)

HTML5 - SVG Ellipse
The following is a HTML5 version of the SVG example, using the tag to draw an ellipse:

<!DOCTYPE html>
<head>
<title>SVG</title>
<meta charset="utf-8" />
</head>
<body>
<h2>HTML5 SVG Ellipse</h2>
<svg id="svgelem" height="200" xmlns="http://www.w3.org/2000/svg">
    <ellipse cx="100" cy="50" rx="100" ry="50" fill="red" />
</svg>
</body>
</html>

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In the latest version of FireFox with HTML5 enabled, this results:

2016219112240763.jpg (225×148)

##HTML5 - SVG Polygon

Here is an HTML5 version of an SVG example, using the tag to draw a polygon:

<!DOCTYPE html>
<head>
<title>SVG</title>
<meta charset="utf-8" />
</head>
<body>
<h2>HTML5 SVG Polygon</h2>
<svg id="svgelem" height="200" xmlns="http://www.w3.org/2000/svg">
    <polygon  points="20,10 300,20, 170,50" fill="red" />
</svg>
</body>
</html>

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In the latest version of FireFox with HTML5 enabled will produce the following results:

2016219112258796.jpg (310×118)

HTML5 - SVG Polyline

Here is an HTML5 version of the SVG example, using

<!DOCTYPE html>
<head>
<title>SVG</title>
<meta charset="utf-8" />
</head>
<body>
<h2>HTML5 SVG Polyline</h2>
<svg id="svgelem" height="200" xmlns="http://www.w3.org/2000/svg">
 <polyline points="0,0 0,20 20,20 20,40 40,40 40,60" fill="red" />
</svg>
</body>
</html>

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In the latest version of FireFox with HTML5 enabled, the following results will be generated:

2016219112318049.jpg (245×114)

HTML5 - SVG Gradient

The following is an HTML5 version of an SVG example using the tag to draw an ellipse and the tag to define an SVG radial gradient.
We can create SVG linear gradients in a similar way using the tag.

<!DOCTYPE html>
<head>
<title>SVG</title>
<meta charset="utf-8" />
</head>
<body>
<h2>HTML5 SVG Gradient Ellipse</h2>
<svg id="svgelem" height="200" xmlns="http://www.w3.org/2000/svg">
   <defs>
      <radialGradient id="gradient" cx="50%" cy="50%" r="50%"
      fx="50%" fy="50%">
      <stop offset="0%" style="stop-color:rgb(200,200,200);   
      stop-opacity:0"/>
      <stop offset="100%" style="stop-color:rgb(0,0,255);   
      stop-opacity:1"/>
      </radialGradient>
   </defs>
   <ellipse cx="100" cy="50" rx="100" ry="50"
      style="fill:url(#gradient)" />
</svg>
</body>
</html>

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The following results will be generated in the latest version of FireFox with HTML5 enabled:

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