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linear gradients and radial gradients.
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the gradient stop is placed. Represents a location along the gradient
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(fx,fy) to the edge of the outermost/largest circle.
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:param 2-tuple start: start point of the gradient (**x1**, **y1**)
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r r? c �( � � e Zd ZdZdZd� 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
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:param inherit: gradient inherits properties from `inherit` see: **xlink:href**
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