139 lines
4.0 KiB
Lua
139 lines
4.0 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 functions related to blocks/chunks.
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blockutil = {
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--- The size of one block in nodes.
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BLOCK_SIZE = 16,
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--- The size of a mapchunk in blocks.
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MAPCHUNK_IN_BLOCKS_SIZE = 5,
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--- The size of one mapchunk in nodes.
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MAPCHUNK_SIZE = 80,
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--- The size of one node.
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NODE_SIZE = 1
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}
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--- Gets the begin coordinates of the block the given coordinates are in.
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--
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-- @param x The x coordinate. Can also be a table with the x, y and z values.
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-- @param y The y coordinate.
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-- @param z The z coordinate.
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-- @return The coordinates (x, y, z) of the blocks begin.
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function blockutil.get_begin(x, y, z)
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if type(x) == "table" then
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local pos = x
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x = pos.x
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y = pos.y
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z = pos.z
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end
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if y == nil and z == nil then
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local begin = x
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if begin >= 48 then
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local difference = math.fmod(begin + 32, 80)
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begin = begin - difference
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elseif begin >= -32 then
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return -32
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else
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local difference = math.fmod(math.abs(begin + 32), 80)
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if difference > 0 then
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difference = 80 - difference
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end
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begin = begin - difference
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end
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return begin
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end
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return blockutil.get_begin(x), blockutil.get_begin(y), blockutil.get_begin(z)
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end
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--- Gets the begin coordinates of the block the given coordinates are in
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-- as position (a table with three entries, x, y, and z).
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--
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-- @param x The x coordinate. Can also be a table with the x, y and z values.
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-- @param y The y coordinate.
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-- @param z The z coordinate.
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-- @return The coordinates (x, y, z) of the blocks begin as pos.
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function blockutil.get_begin_pos(x, y, z)
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local begin_x, begin_y, begin_z = blockutil.get_begin(x, y, z)
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return {
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x = begin_x,
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y = begin_y,
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z = begin_z
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}
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end
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--- Gets the end coordinates of the block the given coordinates are in.
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--
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-- @param x The x coordinate. Can also be a table with the x, y and z values.
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-- @param y The y coordinate.
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-- @param z The z coordinate.
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-- @return The coordinates (x, y, z) of the blocks end.
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function blockutil.get_end(x, y, z)
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if type(x) == "table" then
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local pos = x
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x = pos.x
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y = pos.y
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z = pos.z
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end
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if y == nil and z == nil then
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return blockutil.get_begin(x + constants.block_size) - 1
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end
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return blockutil.get_end(x), blockutil.get_end(y), blockutil.get_end(z)
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end
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--- Gets the end coordinates of the block the given coordinates are in
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-- as position (a table with three entries, x, y, z).
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--
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-- @param x The x coordinate. Can also be a table with the x, y and z values.
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-- @param y The y coordinate.
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-- @param z The z coordinate.
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-- @return The coordinates (x, y, z) of the blocks end as pos.
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function blockutil.get_end_pos(x, y, z)
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local end_x, end_y, end_z = blockutil.get_end(x, y, z)
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return {
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x = end_x,
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y = end_y,
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z = end_z
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}
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end
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