84 lines
2.3 KiB
Lua
84 lines
2.3 KiB
Lua
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function airutils.get_xz_from_hipotenuse(orig_x, orig_z, yaw, distance)
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--cara, o minetest é bizarro, ele considera o eixo no sentido ANTI-HORÁRIO... Então pra equação funcionar, subtrair o angulo de 360 antes
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yaw = math.rad(360) - yaw
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local z = (math.cos(yaw)*distance) + orig_z
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local x = (math.sin(yaw)*distance) + orig_x
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return x, z
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end
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minetest.register_node("airutils:light", {
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drawtype = "airlike",
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--tile_images = {"airutils_light.png"},
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inventory_image = minetest.inventorycube("airutils_light.png"),
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paramtype = "light",
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walkable = false,
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is_ground_content = true,
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light_propagates = true,
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sunlight_propagates = true,
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light_source = 14,
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selection_box = {
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type = "fixed",
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fixed = {0, 0, 0, 0, 0, 0},
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},
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})
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function airutils.remove_light(self)
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if self._light_old_pos then
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--force the remotion of the last light
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minetest.add_node(self._light_old_pos, {name="air"})
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self._light_old_pos = nil
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end
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end
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function airutils.swap_node(self, pos)
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local target_pos = pos
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local have_air = false
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local node = nil
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local count = 0
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while have_air == false and count <= 3 do
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node = minetest.get_node(target_pos)
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if node.name == "air" then
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have_air = true
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break
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end
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count = count + 1
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target_pos.y = target_pos.y + 1
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end
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if have_air then
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minetest.set_node(target_pos, {name='airutils:light'})
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airutils.remove_light(self)
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self._light_old_pos = target_pos
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return true
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end
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return false
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end
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function airutils.put_light(self)
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local pos = self.object:get_pos()
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pos.y = pos.y + 1
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local yaw = self.object:get_yaw()
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local lx, lz = airutils.get_xz_from_hipotenuse(pos.x, pos.z, yaw, 10)
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local light_pos = {x=lx, y=pos.y, z=lz}
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local cast = minetest.raycast(pos, light_pos, false, false)
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local thing = cast:next()
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local was_set = false
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while thing do
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if thing.type == "node" then
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local ipos = thing.intersection_point
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if ipos then
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was_set = airutils.swap_node(self, ipos)
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end
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end
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thing = cast:next()
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end
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if was_set == false then
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local n = minetest.get_node_or_nil(light_pos)
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if n and n.name == 'air' then
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airutils.swap_node(self, light_pos)
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end
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end
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end
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