86 lines
2.0 KiB
Lua
86 lines
2.0 KiB
Lua
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--[[
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TechAge
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=======
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Copyright (C) 2019-2021 Joachim Stolberg
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GPL v3
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See LICENSE.txt for more information
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Rope for TA2 gravity-based energy storage
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]]--
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local Entities = {}
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-- Return first pos after start pos and the destination pos
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local function get_positions(pos, length, force)
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local pos1 = {x = pos.x, y = pos.y - 1, z = pos.z} -- start pos
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local pos2 = {x = pos.x, y = pos.y - 1 - length, z = pos.z} -- end pos
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if force then
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return pos1, pos2 -- force given length
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end
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local _, pos3 = minetest.line_of_sight(pos1, pos2)
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return pos1, pos3 or pos2 -- new values
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end
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local function del_rope(pos)
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local key = minetest.hash_node_position(pos)
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local rope = Entities[key]
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if rope then
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rope:remove()
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Entities[key] = nil
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end
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return key
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end
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local function add_rope(pos, pos1, pos2)
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local key = del_rope(pos)
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pos1.y = pos1.y + 0.5 -- from
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pos2.y = pos2.y - 0.5 -- to
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local pos3 = {x = pos1.x, y = (pos1.y + pos2.y) / 2, z = pos1.z} -- mid-pos
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local length = math.abs(pos1.y - pos2.y)
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local rope = minetest.add_entity(pos3, "techage:ta2_rope")
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if rope then
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rope:set_properties({visual_size = {x = 0.06, y = length}, collisionbox = {x = 0.06, y = length}})
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end
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Entities[key] = rope
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end
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minetest.register_entity("techage:ta2_rope", {
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initial_properties = {
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visual = "cube",
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textures = {
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"techage_rope.png",
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"techage_rope.png",
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"techage_rope.png",
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"techage_rope.png",
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"techage_rope.png",
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"techage_rope.png",
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},
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use_texture_alpha = false,
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physical = true,
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collide_with_objects = true,
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pointable = true,
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static_save = false,
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visual_size = {x = 0.06, y = 10, z = 0.06},
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shaded = true,
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},
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})
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-------------------------------------------------------------------------------
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-- API functions
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-------------------------------------------------------------------------------
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function techage.renew_rope(pos, length, force)
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local pos1, pos2 = get_positions(pos, length, force)
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if pos1 then
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add_rope(pos, pos1, pos2)
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return pos1, pos2
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end
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end
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techage.del_rope = del_rope
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