init

LICENSE.md

@@ -0,0 +1,23 @@
+License of source code
+----------------------
+
+GNU Lesser General Public License, version 2.1
+
+This program is free software; you can redistribute it and/or modify it under the terms
+of the GNU Lesser General Public License as published by the Free Software Foundation;
+either version 2.1 of the License, or (at your option) any later version.
+ 
+This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+See the GNU Lesser General Public License for more details:
+https://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
+
+
+
+Licenses of media (textures, models and sounds)
+-----------------------------------------------
+
+Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0)
+Copyright (C) 2018:
+
+    laza

README.md

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+# LDM32
+
+
+### Laser Distance Meter 32
+
+LDM32 is a simple mod for minetest. It measures the distance between
+the LDM32 device and the next non-air block.
+
+
+### Requirement
+
+Tested with Minetest 0.4.17.1
+
+
+### Recipe
+
+```
+group:wood,          dye:grey,            default:mese_crystal
+default:steel_ingot, default:steel_ingot, default:steel_ingot
+```
+
+### Screenshot
+![Screenshot](https://github.com/laza83/ldm32/blob/master/screenshot_0002.jpg)

depends.txt

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+default

init.lua

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+laser_range = 32
+
+local laser_on = function(pos, facedir_param2, range)
+    local meta = minetest.get_meta(pos)
+    local block_pos = vector.new(pos)
+    local beam_pos = vector.new(pos)
+    local beam_direction = minetest.facedir_to_dir(facedir_param2)
+
+    for i = 1, range + 1, 1 do
+        beam_pos = vector.add(block_pos, vector.multiply(beam_direction, i))
+        if minetest.get_node(beam_pos).name == "air" or minetest.get_node(beam_pos).name == "ldm32:laser_beam" then
+            if i <= range then
+                minetest.set_node(beam_pos, {name = "ldm32:laser_beam", param2 = facedir_param2})
+                meta:set_string("infotext", "Distance: " .. tostring(i) .. "m")
+                meta:set_int("range", i)
+            else
+                meta:set_string("infotext", "Distance: out of range")
+                meta:set_int("range", laser_range)
+            end
+        else
+            break
+        end
+    end
+end
+
+local laser_off = function(pos, facedir_param2, range)
+    local meta = minetest.get_meta(pos)
+    local block_pos = vector.new(pos)
+    local beam_pos = vector.new(pos)
+    local beam_direction = minetest.facedir_to_dir(facedir_param2)
+
+    for i = range, 0, -1 do
+        beam_pos = vector.add(block_pos, vector.multiply(beam_direction, i))
+        if minetest.get_node(beam_pos).name == "ldm32:laser_beam" and minetest.get_node(beam_pos).param2 == facedir_param2 then
+            minetest.set_node(beam_pos, {name="air"})
+        end
+    end
+end
+
+local laser_check = function(pos, facedir_param2, range)
+    local block_pos = vector.new(pos)
+    local beam_pos = vector.new(pos)
+    local beam_direction = minetest.facedir_to_dir(facedir_param2)
+    local is_not_beam = false
+    
+    for i = 1, range + 1, 1 do
+        beam_pos = vector.add(block_pos, vector.multiply(beam_direction, i))
+        if minetest.get_node(beam_pos).name ~= "ldm32:laser_beam" and i <= range then
+            is_not_beam = true
+        elseif minetest.get_node(beam_pos).name == "air" and i <= laser_range then
+            is_not_beam = true
+        end
+    end
+    return is_not_beam
+end
+
+minetest.register_node("ldm32:casing", {
+    description = "Laser Distance Meter",
+    inventory_image = "ldm32_inventory.png",
+    drawtype = "mesh",
+    mesh = "ldm32_casing.obj",
+    tiles = {"ldm32_casing2.png",
+             "ldm32_casing.png",},
+    selection_box = {
+        type = "fixed",
+        fixed = {{-0.07, -0.5, -0.5, 0.07, -0.25, 0.5},}
+    },
+    collision_box = {
+        type = "fixed",
+        fixed = {{-0.07, -0.5, -0.5, 0.07, -0.25, 0.5},}
+    },
+    stack_max = 1,
+    is_ground_content = true,
+    paramtype2 = "facedir",
+    groups = {snappy = 3, dig_immediate = 3},
+    on_place = minetest.rotate_node,
+
+    on_timer = function(pos)
+        local meta = minetest.get_meta(pos)
+        local node = minetest.get_node(pos)
+        local timer = minetest.get_node_timer(pos)
+        local is_not_beam = false
+        local is_air = false
+
+        if meta:get_string("is_on") == "true" then
+            if laser_check(pos, node.param2, meta:get_int("range")) then
+                laser_off(pos, node.param2, meta:get_int("range"))
+                laser_on(pos, node.param2, laser_range)
+            end
+            if meta:get_int("facedir") ~= node.param2 and meta:get_string("is_on") then
+                laser_off(pos, meta:get_int("facedir"), laser_range)
+                laser_on(pos, node.param2, laser_range)
+                meta:set_int("facedir", node.param2)
+            end
+        end
+        timer:start(1)
+    end,
+
+    on_construct = function(pos)
+        local meta = minetest.get_meta(pos)
+        local node = minetest.get_node(pos)
+        meta:set_string("infotext","Off")
+        meta:set_string("is_on", "false")
+        meta:set_int("facedir", node.param2)
+    end,
+
+    after_destruct = function(pos, oldnode, oldmetadata)
+        local meta = minetest.get_meta(pos)
+        laser_off(pos, oldnode.param2, laser_range)
+        meta:set_string("infotext", "Off")
+        meta:set_string("is_on", "false")
+    end,
+
+    after_dig_node = function(pos, oldnode)
+        local meta = minetest.get_meta(pos)
+        laser_off(pos, oldnode.param2, laser_range)
+        meta:set_string("infotext", "Off")
+        meta:set_string("is_on", "false")
+    end,
+
+    on_rightclick = function(pos, node, player, itemstack, pointed_thing)
+        local meta = minetest.get_meta(pos)
+        local node = minetest.get_node(pos)
+        local timer = minetest.get_node_timer(pos)
+
+        if meta:get_string("is_on") == "false" then
+            laser_on(pos, node.param2, laser_range)
+            meta:set_string("is_on", "true")
+            timer:start(1)
+        else
+            laser_off(pos, node.param2, meta:get_int("range"))
+            meta:set_string("infotext", "Off")
+            meta:set_string("is_on", "false")
+            timer:stop()
+        end
+    end,
+})
+
+minetest.register_node("ldm32:laser_beam", {
+    description = "Laser Beam",
+    drawtype = "mesh",
+    mesh = "ldm32_laser_beam.obj",
+    tiles = {"ldm32_beam.png"},
+    paramtype = "light",
+    paramtype2 = "facedir",
+    use_texture_alpha = true,
+    --alpha = 0,
+    light_source = 4,
+    post_effect_color = {r=128,g=64,b=64, a=128},
+    sunlight_propagates = true,
+    walkable = false,
+    pointable = false,
+    diggable = false,
+    buildable_to = true,
+})
+
+minetest.register_craft({
+    --type = "sharpless",
+    output = "ldm32:casing",
+    recipe = {
+              {"group:wood","dye:grey","default:mese_crystal"},
+              {"default:steel_ingot","default:steel_ingot","default:steel_ingot"}
+             }
+})

models/ldm32_casing.obj

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