Numpy+images#141

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tcld wants to merge 19 commits intoMindwerks:masterfrom

tcld:numpy+images

Commits on Oct 20, 2015

find_threshold_f() now takes parameters regarding the necessary precision of the threshold.
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Added a custom equality check and made other small changes.
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Double-checked the switch from Python array to numpy array for the irrigation-map.
tcld
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Replaced ocean-, elevation-, precipitation- and water-map with numpy arrays.
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Replaced humidity, permeability-, temperature-, sea_depth-, lake- and river-maps with numpy maps.
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Small changes to astar.py.
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Tiny changes.
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Removed calls to numpy.transpose() where it didn't give any benefit in performance.
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Replaced the biome-map with a numpy-array and fixed two small errors I made before.
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Applied psi29s suggestions.
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While at it I replaced calls to is_land() and is_ocean() which were responsible for half of all function calls during world-generation (i.e. tens of millions).
tcld
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Replaced two calls to array_to_matrix() with numpy-methods.
tcld
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