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SVG - Filters
SVG - Filters
SVG uses <filter> element to define filters. <filter> element uses an id attribute to uniquely identify it.Filters are defined within <def> elements and then are referenced by graphics elements by their ids.
SVG provides a rich set of filters. Following is the pst of the commonly used filters.
feBlend
feColorMatrix
feComponentTransfer
feComposite
feConvolveMatrix
feDiffuseLighting
feDisplacementMap
feFlood
feGaussianBlur
feImage
feMerge
feMorphology
feOffset - filter for drop shadows
feSpecularLighting
feTile
feTurbulence
feDistantLight
fePointLight
feSpotLight
Declaration
Following is the syntax declaration of <filter> element. We ve shown main attributes only.
<filter filterUnits="units to define filter effect region" primitiveUnits="units to define primitive filter subregion" x="x-axis co-ordinate" y="y-axis co-ordinate" width="length" height="length" filterRes="numbers for filter region" xpnk:href="reference to another filter" > </filter>
Attributes
| Sr.No. | Name & Description |
|---|---|
| 1 | filterUnits − units to define filter effect region. It specifies the coordinate system for the various length values within the filter and for the attributes defining the filter subregion. If filterUnits="userSpaceOnUse", values represent values in the current user coordinate system in place at the time when the filter element is used. If filterUnits="objectBoundingBox", values represent values in fractions or percentages of the bounding box on the referencing element in place at the time when the filter element is used. Default is userSpaceOnUse. |
| 2 | primitiveUnits − units to define filter effect region. It specifies the coordinate system for the various length values within the filter and for the attributes defining the filter subregion. If filterUnits="userSpaceOnUse", values represent values in the current user coordinate system in place at the time when the filter element is used. If filterUnits="objectBoundingBox", values represent values in fractions or percentages of the bounding box on the referencing element in place at the time when the filter element is used. Default is userSpaceOnUse. |
| 3 | x − x-axis co-ordinate of the filter bounding box. Defeault is 0. |
| 4 | y − y-axis co-ordinate of the filter bounding box. Default is 0. |
| 5 | width − width of the filter bounding box. Default is 0. |
| 6 | height − height of the filter bounding box. Default is 0. |
| 7 | filterRes − numbers representing filter regions. |
| 8 | xpnk:href − used to refer to another filter. |
Example
testSVG.htm
<html>
<title>SVG Filter</title>
<body>
<h1>Sample SVG Filter</h1>
<svg width="800" height="800">
<defs>
<filter id="filter1" x="0" y="0">
<feGaussianBlur in="SourceGraphic" stdDeviation="8" />
</filter>
<filter id="filter2" x="0" y="0" width="200%" height="200%">
<feOffset result="offOut" in="SourceAlpha" dx="20" dy="20" />
<feGaussianBlur result="blurOut" in="offOut" stdDeviation="10" />
<feBlend in="SourceGraphic" in2="blurOut" mode="normal" />
</filter>
</defs>
<g>
<text x="30" y="50" >Using Filters (Blur Effect): </text>
<rect x="100" y="100" width="90" height="90" stroke="green" stroke-width="3"
fill="green" filter="url(#filter1)" />
</g>
</svg>
</body>
</html>
Two <filter> elements defined as filter1 and filter2.
feGaussianBlur filter effect defines the blur effect with the amount of blur using stdDeviation.
in="SourceGraphic" defines that the effect is apppcable for the entire element.
feOffset filter effect is used to create shadow effect. in="SourceAlpha" defines that the effect is apppcable for the alpha part of RGBA graphics.
<rect> elements pnked the filters using filter attribute.
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.
Filter with Shadow effect
<html>
<title>SVG Filter</title>
<body>
<h1>Sample SVG Filter</h1>
<svg width="800" height="800">
<defs>
<filter id="filter1" x="0" y="0">
<feGaussianBlur in="SourceGraphic" stdDeviation="8" />
</filter>
<filter id="filter2" x="0" y="0" width="200%" height="200%">
<feOffset result="offOut" in="SourceAlpha" dx="20" dy="20" />
<feGaussianBlur result="blurOut" in="offOut" stdDeviation="10" />
<feBlend in="SourceGraphic" in2="blurOut" mode="normal" />
</filter>
</defs>
<g>
<text x="30" y="50" >Using Filters (Shadow Effect): </text>
<rect x="100" y="100" width="90" height="90" stroke="green" stroke-width="3"
fill="green" filter="url(#filter2)" />
</g>
</svg>
</body>
</html>
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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