Class centering
Style of centering to use with the map, the default is constrained
none: map will be placed flush with the margin/box in the top left corner
constrained: map will be centered on the most constrained axis (for a portrait page
and a square map this will be horizontally)
unconstrained: map will be centered on the unconstrained axis
vertical:
horizontal:
both:
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none = 0
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constrained = 1
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unconstrained = 2
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vertical = 3
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horizontal = 4
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both = 5
Some predefined page sizes custom sizes can also be passed a tuple of
the page width and height in meters
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