84 lines
2.8 KiB
Lua
84 lines
2.8 KiB
Lua
--[[
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Copyright (c) 2014, Robert 'Bobby' Zenz
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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--]]
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--- Various utility functions for working with tables.
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tableutil = {}
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--- Reindexes the given 2d array/table, swapping the two dimensions.
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--
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-- @param data The array/table to reindex.
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-- @param new_x The new startpoint for the first dimension.
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-- @param new_y The new startpoint for the second dimension.
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-- @return The reindexed data.
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function tableutil.swapped_reindex2d(data, new_x, new_y)
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local reindexed_data = {}
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for old_x = 1, constants.block_size, 1 do
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local index_x = new_x + old_x - 1
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reindexed_data[index_x] = {}
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for old_y = 1, constants.block_size, 1 do
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local index_y = new_y + old_y - 1
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reindexed_data[index_x][index_y] = data[old_y][old_x]
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end
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end
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return reindexed_data
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end
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--- Reindexes the given 3d array/table, swapping the two dimensions.
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--
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-- @param data The array/table to reindex.
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-- @param new_x The new startpoint for the first dimension.
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-- @param new_y The new startpoint for the second dimension.
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-- @param new_z The new startpoint for the third dimension.
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-- @return The reindexed data.
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function tableutil.swapped_reindex3d(data, new_x, new_y, new_z)
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local reindexed_data = {}
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for old_x = 1, constants.block_size, 1 do
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local index_x = new_x + old_x - 1
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reindexed_data[index_x] = {}
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for old_z = 1, constants.block_size, 1 do
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local index_z = new_z + old_z - 1
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reindexed_data[index_x][index_z] = {}
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for old_y = 1, constants.block_size, 1 do
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local index_y = new_y + old_y - 1
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reindexed_data[index_x][index_z][index_y] = data[old_z][old_y][old_x]
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end
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end
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end
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return reindexed_data
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end
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