SVG - Patterns


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SVG uses <pattern> element to define patterns. Patterns are defined using <pattern> element and are used to fill graphics elements in tiled fashion.

Declaration

Following is the syntax declaration of <pattern> element. We've shown main attributes only.

<pattern
   patternUnits="units to define x,y, width and height attributes."
   patternContentUnits ="units to define co-ordinate system of contents of pattern"
   patternTransform = "definition of an additional transformation from the pattern coordinate system onto the target coordinate system"
   
   x="x-axis co-ordinate" 
   y="y-axis co-ordinate"     
   
   width="length"
   height="length"
   
   preserveAspectRatio="to preserve width/height ratio of original content"
   xlink:href="reference to another pattern" >
</pattern>

Attributes

Sr.No. Name & Description
1 patternUnits − units to define patterns effect region. It specifies the coordinate system for the various length values within the pattern and for the attributes defining the pattern subregion. If patternUnits="userSpaceOnUse", values represent values in the current user coordinate system in place at the time when the 'pattern' element is used. If patternUnits="objectBoundingBox", values represent values in fractions or percentages of the bounding box on the referencing element in place at the time when the 'pattern' element is used. Default is userSpaceOnUse.
2 patternContentUnits − units to define pattern content region. It specifies the coordinate system for the various length values within the pattern and for the attributes defining the pattern subregion. If patternContentUnits="userSpaceOnUse", values represent values in the current user coordinate system in place at the time when the 'pattern' element is used. If patternContentUnits="objectBoundingBox", values represent values in fractions or percentages of the bounding box on the referencing element in place at the time when the 'pattern' element is used. Default is userSpaceOnUse.
3 x − x-axis co-ordinate of the pattern bounding box. Defeault is 0.
4 y − y-axis co-ordinate of the pattern bounding box. Default is 0.
5 width − width of the pattern bounding box. Default is 0.
6 height − height of the pattern bounding box. Default is 0.
7 preserveAspectRatio - to preserve width/height ratio of original content.
8 xlink:href − used to refer to another pattern.

Example

testSVG.htm
<html>
   <title>SVG Pattern</title>
   <body>
      <h1>Sample SVG Pattern</h1>
      
      <svg width="800" height="800">
         
         <defs>
            <pattern id="pattern1" patternUnits="userSpaceOnUse"
               x="0" y="0" width="100" height="100"
               viewBox="0 0 4 4" >
               <path d="M 0 0 L 3 0 L 1.5 3 z" fill="blue" stroke="green" />
            </pattern> 
         </defs>
         
         <g>
            <text x="30" y="50" >Using Pattern (Triangles): </text>
            <rect x="100" y="100" width="300" height="300" stroke="green" 
            stroke-width="3" fill="url(#pattern1)" />
         </g> 
         
      </svg>
   
   </body>
</html>
  • One <pattern> element defined as pattern1.

  • In pattern, a viewbox is defined and a path which is to be used as pattern is defined.

  • in rect element, in fill attribute, url of the pattern is specified to fill the rectangle with pattern created earlier.

Output

Open textSVG.htm in Chrome web browser. You can use Chrome/Firefox/Opera to view SVG image directly without any plugin. Internet Explorer 9 and higher also supports SVG image rendering.



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