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Gradients consist of continuously smooth color transitions along a vector
from one color to another, possibly followed by additional transitions along
the same vector to other colors. SVG provides for two types of gradients:
linear gradients and radial gradients.
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:param offset: is either a <number> (usually ranging from 0 to 1) or
a `<percentage>` (usually ranging from 0% to 100%) which indicates where
the gradient stop is placed. Represents a location along the gradient
vector. For radial gradients, it represents a percentage distance from
(fx,fy) to the edge of the outermost/largest circle.
:param color: indicates what color to use at that gradient stop
:param opacity: defines the opacity of a given gradient stop
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:param 2-tuple start: start point of the gradient (**x1**, **y1**)
:param 2-tuple end: end point of the gradient (**x2**, **y2**)
:param inherit: gradient inherits properties from `inherit` see: **xlink:href**
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rr?c�(��eZdZdZdZd�fd� Z�xZS)�RadialGradientzE Radial gradients are defined by a SVG <radialGradient> element.
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:param 2-tuple center: center point for the gradient (**cx**, **cy**)
:param r: radius for the gradient
:param 2-tuple focal: focal point for the radial gradient (**fx**, **fy**)
:param inherit: gradient inherits properties from `inherit` see: **xlink:href**
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