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This module defines default legend handlers.
Legend handlers are expected to be a callable object with a following
signature. ::
legend_handler(legend, orig_handle, fontsize, handlebox)
Where *legend* is the legend itself, *orig_handle* is the original
plot, *fontsize* is the fontsize in pixles, and *handlebox* is a
OffsetBox instance. Within the call, you should create relevant
artists (using relevant properties from the *legend* and/or
*orig_handle*) and add them into the handlebox. The artists needs to
be scaled according to the fontsize (note that the size is in pixel,
i.e., this is dpi-scaled value).
This module includes definition of several legend handler classes
derived from the base class (HandlerBase) with a following method.
def __call__(self, legend, orig_handle,
fontsize,
handlebox):
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A Base class for default legend handlers.
The derived classes are meant to override *create_artists* method, which
has a following signature.::
def create_artists(self, legend, orig_handle,
xdescent, ydescent, width, height, fontsize,
trans):
The overridden method needs to create artists of the given
transform that fits in the given dimension (xdescent, ydescent,
width, height) that are scaled by fontsize if necessary.
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x, y, w, h in display coordinate w/ default dpi (72)
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