SVG:radialGradient要素
gradientUnits="'userSpaceOnUse' or 'objectBoundingBox'.
Use the view box or object to determine relative position of vector points.
(Default 'objectBoundingBox')"
gradientTransform="the transformation to apply to the gradient"
cx="the center point of the gradient (number or % - 50% is default)"
cy="the center point of the gradient. (50% default)"
r="the radius of the gradient. (50% default)"
fx="the focus point of the gradient. (0% default)"
fy="The focus point of the gradient. (0% default)"
spreadMethod="'pad' or 'reflect' or 'repeat'"
xlink:href="Reference to another gradient whose attribute values are used as defaults and stops included. Recursive"
rg.svg<svg
viewBox="0 0 10 10"
xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink">
<defs>
<radialGradient id="myGradient">
<stop offset="10%" stop-color="gold" />
<stop offset="95%" stop-color="red" />
</radialGradient>
</defs>
<!-- using my radial gradient -->
<circle cx="5" cy="5" r="4" fill="url('#myGradient')" />
</svg>