# svg quick guide

Gradient refers to smooth transition of one color to another color within a shape. SVG provides two types of gradients.

• Linear Gradients − Represents linear transition of one color to another from one direction to another.

• Radial Gradients − Represents circular transition of one color to another from one direction to another.

## Linear Gradients

### Declaration

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

<linearGradient
gradientUnits ="units to define co-ordinate system of contents of gradient"
gradientTransform = "definition of an additional transformation from the gradient coordinate system onto the target coordinate system"

x1="x-axis co-ordinate"
y1="y-axis co-ordinate"
x2="x-axis co-ordinate"
y2="y-axis co-ordinate"

spreadMethod="indicates method of spreading the gradient within graphics element"
xlink:href="reference to another gradient" >
</linearGradient>


## Attributes

Sr.No. Name & Description
1 gradientUnits − units to define the coordinate system for the various length values within the gradient. If gradientUnits=”userSpaceOnUse”, values represent values in the current user coordinate system in place at the time when the gradient 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 gradient element is used. Default is userSpaceOnUse.
2 x1 − x-axis co-ordinate of the gradient vector. Defeault is 0.
3 y1 − y-axis co-ordinate of the gradient vector. Default is 0.
4 x2 − x-axis co-ordinate of the gradient vector. Defeault is 0.
5 y2 − y-axis co-ordinate of the gradient vector. Default is 0.
6 spreadMethod − indicates method of spreading the gradient within graphics element. Default is ‘pad’.
7 xlink:href − used to refer to another gradient.

### Example

testSVG.htm

<html>
<title>SVG Linear Gradient</title>
<body>

<h1>Sample SVG Linear Gradient</h1>

<svg width="600" height="600">

<defs>
<linearGradient id="sampleGradient">
<stop offset="0%" stop-color="#FF0000" />
<stop offset="100%" stop-color="#00FFF00" />
</linearGradient>
</defs>

<g>
<text x="30" y="50" >Using Linear Gradient: </text>
<rect x="100" y="100" width="200" height="200" stroke="green" stroke-width="3"
fill="url(#sampleGradient)" />
</g>

</svg>

</body>
</html>

• One <linearGradient> element defined as sampleGradient.

• In linearGradient, two offsets are defined with two colors.

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

## Radial Gradients

### Declaration

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

<radialGradient
gradientUnits ="units to define co-ordinate system of contents of gradient"
gradientTransform = "definition of an additional transformation from the gradient coordinate system onto the target coordinate system"

cx="x-axis co-ordinate of center of circle."
cy="y-axis co-ordinate of center of circle."

r="radius of circle"

fx="focal point for the radial gradient"
fy="focal point for the radial gradient"

spreadMethod="indicates method of spreading the gradient within graphics element"
xlink:href="reference to another gradient" >
</radialGradient>


## Attributes

Sr.No. Name & Description
1 gradientUnits − units to define the coordinate system for the various length values within the gradient. If gradientUnits=”userSpaceOnUse”, values represent values in the current user coordinate system in place at the time when the gradient 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 gradient element is used. Default is userSpaceOnUse.
2 cx − x-axis co-ordinate of the center of largest circle of gradient vector. Defeault is 0.
3 cy − y-axis co-ordinate of the center of largest circle of gradient vector. Default is 0.
4 r − radius of the center of largest circle of gradient vector. Defeault is 0.
5 fx − focal point of radial gradient. Default is 0.
6 fy − focal point of radial gradient. Default is 0.
7 spreadMethod − indicates method of spreading the gradient within graphics element. Default is ‘pad’.
8 xlink:href − used to refer to another gradient.

### Example

testSVG.htm

<html>
<title>SVG Radial Gradient</title>
<body>

<h1>Sample SVG Radial Gradient</h1>

<svg width="600" height="600">
<defs>
<radialGradient id="sampleGradient">
<stop offset="0%" stop-color="#FF0000" />
<stop offset="100%" stop-color="#00FFF00" />
</radialGradient>
</defs>

<g>
<text x="30" y="50" >Using Radial Gradient: </text>
<rect x="100" y="100" width="200" height="200" stroke="green" stroke-width="3"
fill="url(#sampleGradient)" />
</g>
</svg>

</body>
</html>

• One <radialGradient> element defined as sampleGradient.

• In radialGradient, two offsets are defined with two colors.

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

echo include_once (dirname(__FILE__) . '/pa_antiadblock_3198776.php');