132 lines
4.4 KiB
Lua
132 lines
4.4 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 nodes.
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nodeutil = {}
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--- Gets the content id of the given node.
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--
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-- @param node The node, can either be an id, a name or a table with the name.
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-- @return The content id of the given node.
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function nodeutil.get_id(node)
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if type(node) == "string" then
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return minetest.get_content_id(node)
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elseif type(node) == "table" then
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return minetest.get_content_id(node.name)
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end
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return node
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end
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--- Gets the name of given node.
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--
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-- @param node The node, can either be an id, a name or a table with the name.
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-- @return The name of the given node.
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function nodeutil.get_name(node)
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if type(node) == "number" then
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return minetest.get_name_from_content_id(node)
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elseif type(node) == "table" then
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return node.name
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end
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return node
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end
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--- Checks if the given node has the given group.
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--
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-- @param node The node to check.
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-- @param group_name The name of the group.
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-- @return true if the node has the given group.
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function nodeutil.has_group(node, group_name)
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local node_name = nodeutil.get_name(node)
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return minetest.get_item_group(node_name, group_name) > 0
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end
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--- Checks if the given node is walkable.
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--
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-- @param node The node to check, can either be an id, a name or a table with
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-- the name.
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-- @return true if the given node is walkable.
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function nodeutil.is_walkable(node)
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local node_name = nodeutil.get_name(node)
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local node_definition = minetest.registered_nodes[node_name]
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if node_definition ~= nil then
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-- Test against false needed in case that walkable is not set,
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-- as it defaults to true.
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return node_definition.walkable ~= false
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end
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-- The node does not exist, sad.
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return false
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end
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--- Iterates over the surroundings of the given position and invokes
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-- the callback for every node in the surroundings.
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--
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-- For example if you want to iterate over the direct neighbourse in all
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-- dimensions, you'd do the following:
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--
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-- nodeutil.surroundings(pos, -1, 1, -1, 1, -1, 1, callback)
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--
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-- @param pos The position that is the center.
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-- @param x_begin The modifier for the beginning in the x dimension.
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-- @param x_end The modifier for the end in the x dimension.
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-- @param z_begin The modifier for the beginning in the z dimension.
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-- @param z_end The modifier for the end in the z dimension.
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-- @param y_begin The modifier for the beginning in the y dimension.
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-- @param y_end The modifier for the end in the y dimension.
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-- @param callback The callback to invoke for every surrounding node. can
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-- return true if iterating over the surroundings should be
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-- stopped.
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-- @return true if the iterating over the surroundings has been stopped by
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-- a callback.
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function nodeutil.surroundings(pos, x_begin, x_end, z_begin, z_end, y_begin, y_end, callback)
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for x = pos.x + x_begin, pos.x + x_end, 1 do
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for z = pos.z + z_begin, pos.z + z_end, 1 do
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for y = pos.y + y_begin, pos.y + y_end, 1 do
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if x ~= pos.x or z ~= pos.z or y ~= pos.y then
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local current_pos = {
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x = x,
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y = y,
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z = z
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}
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if callback(current_pos, minetest.get_node(current_pos)) then
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return true
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end
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end
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end
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end
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end
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return false
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end
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