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<h1>SVG Gradients - Linear</h1>
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<p class="intro">An SVG Gradient must be defined within a <defs> tag.</p>
<hr />
<h2>SVG Gradients</h2>
<p>A gradient is a smooth transition from one color to another. In addition,
several color transitions can be applied to the same element.</p>
<p>There are two main types of gradients in SVG:</p>
<ul>
<li>Linear Gradients</li>
<li>Radial Gradients</li>
</ul>
<hr />
<h2>Linear Gradients</h2>
<p>The <linearGradient> tag is used to define an SVG linear gradient.</p>
<p>The <linearGradient> tag must be nested within a <defs> tag. The <defs> tag is short
for definitions and it allows definition of special
elements such as gradients.</p>
<p>Linear gradients can be defined as horizontal, vertical or angular gradients:</p>
<ul>
<li>Horizontal gradients are created when y1 and y2 are
equal and x1 and x2 differ</li>
<li>Vertical gradients are created when x1 and x2 are equal and y1 and y2 differ</li>
<li>Angular gradients are created when x1 and x2 differ and y1 and y2 differ</li>
</ul>
<p>Copy the following code into Notepad and save
the file as "linear1.svg". Place the file in your Web directory:</p>
<table width="100%" border="1" class="ex" cellspacing="0"><tr><td>
<pre><?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"></pre>
<pre><svg width="100%" height="100%" version="1.1"
xmlns="http://www.w3.org/2000/svg"></pre>
<pre><defs>
<linearGradient id="orange_red" x1="0%" y1="0%" x2="100%" y2="0%">
<stop offset="0%" style="stop-color:rgb(255,255,0);
stop-opacity:1"/>
<stop offset="100%" style="stop-color:rgb(255,0,0);
stop-opacity:1"/>
</linearGradient>
</defs></pre>
<pre><ellipse cx="200" cy="190" rx="85" ry="55"
style="fill:url(#orange_red)"/></pre>
<pre></svg></pre>
</td></tr></table>
<p><b>Code explanation:</b></p>
<ul>
<li>The id attribute of the <linearGradient> tag defines a unique name for the gradient</li>
<li>The fill:url(#orange_red) property links the ellipse element to the gradient</li>
<li>The x1, x2, y1,y2 attributes of the <linearGradient> tag define the starting and ending position of the gradient</li>
<li>The color range for a gradient can be composed of two or more colors. Each color
is specified with a <stop>
tag. The offset attribute is used to define where the gradient color begin and
end</li>
</ul>
<p><a target="_blank" href="linear1.svg">View example</a> (Horizontal gradient)</p>
<p>Another example:</p>
<table width="100%" border="1" class="ex" cellspacing="0"><tr><td>
<pre><?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"></pre>
<pre><svg width="100%" height="100%" version="1.1"
xmlns="http://www.w3.org/2000/svg"></pre>
<pre><defs>
<linearGradient id="orange_red" x1="0%" y1="0%" x2="0%" y2="100%">
<stop offset="0%" style="stop-color:rgb(255,255,0);
stop-opacity:1"/>
<stop offset="100%" style="stop-color:rgb(255,0,0);
stop-opacity:1"/>
</linearGradient>
</defs></pre>
<pre><ellipse cx="200" cy="190" rx="85" ry="55"
style="fill:url(#orange_red)"/></pre>
<pre></svg></pre>
</td></tr></table>
<p><a target="_blank" href="linear3.svg">View example</a> (Vertical gradient)</p>
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