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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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z_AbstractGradient.__init__�nonec C s d| � � |f S )z( Returns the <FuncIRI> of the gradient. z%s %s)Z get_funciri)r �defaultr r r �get_paint_server- s z"_AbstractGradient.get_paint_serverc C s | � t|||| d�� | S )a: Adds a stop-color to the gradient.
: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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r r r �add_stop_color1 s z _AbstractGradient.add_stop_color�g g �?c C sb t |d �}t |d �}|| t t|�d � }|}x(|D ] }| �t|d�||� ||7 }q:W | S )z� Add stop-colors from colors with linear offset distributuion
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r c s& e Zd ZdZdZd� fdd� Z� ZS )�LinearGradientzE Linear gradients are defined by a SVG <linearGradient> element.
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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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r r r )r r r* W s r* c s& e Zd ZdZdZd� fdd� Z� ZS )�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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