XML/SVG/radialGradient

Creating 3D Effects with Circles

<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN"
 "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
<svg xmlns="http://www.w3.org/2000/svg"
  xmlns:xlink="http://www.w3.org/1999/xlink" width="100%"
  height="100%">
  <defs>
    <radialGradient id="blueCircle"
      gradientUnits="objectBoundingBox" fx="30%" fy="30%">
      <stop offset="0%" style="stop-color:#FFFFFF" />
      <stop offset="40%" style="stop-color:#0000AA" />
      <stop offset="100%" style="stop-color:#000066" />
    </radialGradient>
    <circle id="3DBlueCircle" cx="0" cy="0" r="80"
      style="fill:url(#blueCircle)" />
  </defs>
  <g width="100%" height="100%">
    <use xlink:href="#3DBlueCircle" x="100" y="100" />
  </g>
</svg>

Multi-Stop Radial Gradients

<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 20010904//EN"
  "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
<svg width="100%" height="100%" xmlns="http://www.w3.org/2000/svg">
  <defs>
    <radialGradient id="radialGradient1"
      gradientUnits="userSpaceOnUse" cx="400" cy="200" r="300" fx="400"
      fy="200">
      <stop offset="0%" stop-color="yellow" />
      <stop offset="67%" stop-color="red" />
      <stop offset="100%" stop-color="blue" />
    </radialGradient>
    <radialGradient id="radialGradient2"
      gradientUnits="userSpaceOnUse" cx="400" cy="200" r="300" fx="400"
      fy="200">
      <stop offset="0%" stop-color="yellow" />
      <stop offset="33%" stop-color="blue" />
      <stop offset="100%" stop-color="red" />
    </radialGradient>
  </defs>
  <g transform="translate(50,20)">
    <ellipse fill="url(#radialGradient1)" stroke="black"
      stroke-width="8" cx="300" cy="100" rx="300" ry="100" />
    <rect fill="url(#radialGradient2)" stroke="black"
      stroke-width="8" x="0" y="200" width="600" height="300" />
  </g>
</svg>

Rendering Rectangles with Radial Gradients

<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 20001102//EN"
 "http://www.w3.org/TR/2000/CR-SVG-20001102/DTD/svg-20001102.dtd">
<svg width="100%" height="100%">
  <defs>
    <radialGradient id="gradientDefinition"
      gradientUnits="userSpaceOnUse">
      <stop stop-color="yellow" offset="0%" />
      <stop stop-color="black" offset="100%" />
    </radialGradient>
  </defs>
  <rect x="50" y="50" width="400" height="250" stroke-width="4"
    stroke="yellow" stroke-dasharray="2 2 2 2"
    style="fill:url(#gradientDefinition)" />
</svg>