particles, on_blast(), luacheckrc

.luacheckrc

@@ -0,0 +1,22 @@
+unused_args = false
+allow_defined_top = true
+
+globals = {
+	"minetest",
+	"spacecannon"
+}
+
+read_globals = {
+	-- Stdlib
+	string = {fields = {"split"}},
+	table = {fields = {"copy", "getn"}},
+
+	-- mod deps
+	"technic", "default",
+
+	-- Minetest
+	"minetest",
+	"vector", "ItemStack",
+	"dump"
+
+}

cannon.lua

@@ -57,22 +57,22 @@ local register_spacecannon = function(def)
 				end
 
 				if collided then
-					spacecannon.destroy(pos, def.range)
+					spacecannon.destroy(pos, def.range, def.intensity)
 					self.object:remove()
 				end
 
 			elseif node.name ~= "air" and node.name ~= "vacuum:vacuum" then
 				-- collision
-				spacecannon.destroy(pos, def.range)
+				spacecannon.destroy(pos, def.range, def.intensity)
 				self.object:remove()
 
 			end
 		end,
 
 		on_activate = function(self, staticdata)
-				minetest.after(def.timeout, 
-					function(self) 
-						self.object:remove()
+				minetest.after(def.timeout,
+					function(me)
+						me.object:remove()
 					end,
 					self)
 		end
@@ -143,8 +143,6 @@ local register_spacecannon = function(def)
 		end,
 
 		on_receive_fields = function(pos, formname, fields, sender)
-			local meta = minetest.get_meta(pos);
-
 			if fields.fire then
 				spacecannon.fire(pos, def.color, def.speed, def.range)
 			end
@@ -170,6 +168,7 @@ end
 register_spacecannon({
 	color = "green",
 	range = 1,
+	intensity = 1,
 	timeout = 8,
 	speed = 10,
 	desc = "fast,low damage",
@@ -179,6 +178,7 @@ register_spacecannon({
 register_spacecannon({
 	color = "yellow",
 	range = 3,
+	intensity = 2,
 	timeout = 8,
 	speed = 5,
 	desc = "medium speed, medium damage",
@@ -188,6 +188,7 @@ register_spacecannon({
 register_spacecannon({
 	color = "red",
 	range = 5,
+	intensity = 4,
 	timeout = 15,
 	speed = 3,
 	desc = "slow, heavy damage",

util.lua

@@ -20,7 +20,6 @@ spacecannon.fire = function(pos, color, speed, range)
 
 	-- check fuel/power
 	local meta = minetest.get_meta(pos)
-	local owner = meta:get_string("owner")
 
 	if meta:get_int("powerstorage") < spacecannon.config.powerstorage * range then
 		-- not enough power
@@ -45,12 +44,14 @@ end
 
 -- destroy stuff in range
 -- TODO: resilient material list
-spacecannon.destroy = function(pos,range)
+spacecannon.destroy = function(pos, range, intensity)
 
 	if not spacecannon.can_destroy(pos) then
 		return
 	end
 
+	local particle_texture = nil
+
 	for x=-range,range do
 		for y=-range,range do
 			for z=-range,range do
@@ -64,14 +65,28 @@ spacecannon.destroy = function(pos,range)
 					local n = minetest.get_node_or_nil(np)
 
 					if n and n.name ~= "air" then
-						minetest.set_node(np, {name="air"})
-						local itemstacks = minetest.get_node_drops(n.name)
-						for _, itemname in ipairs(itemstacks) do
-							if math.random(5) == 5 then
-								-- chance drop
-								minetest.add_item(np, itemname)
+						local node_def = minetest.registered_nodes[n.name]
+
+						if node_def and node_def.tiles and node_def.tiles[1] then
+							particle_texture = node_def.tiles[1]
+						end
+
+						if node_def.on_blast then
+							-- custom on_blast
+							node_def.on_blast(np, intensity)
+
+						else
+							-- default behavior
+							minetest.set_node(np, {name="air"})
+							local itemstacks = minetest.get_node_drops(n.name)
+							for _, itemname in ipairs(itemstacks) do
+								if math.random(5) == 5 then
+									-- chance drop
+									minetest.add_item(np, itemname)
+								end
 							end
 						end
+
 					end
 				end
 			end
@@ -98,6 +113,25 @@ spacecannon.destroy = function(pos,range)
 			glow = 5
 	})
 
+	if particle_texture then
+		minetest.add_particlespawner({
+				amount = 64,
+				time = 0.5,
+				minpos = vector.subtract(pos, radius / 2),
+				maxpos = vector.add(pos, radius / 2),
+				minvel = {x = -10, y = -10, z = -10},
+				maxvel = {x = 10, y = 10, z = 10},
+				minacc = vector.new(),
+				maxacc = vector.new(),
+				minexptime = 1,
+				maxexptime = 2.5,
+				minsize = radius * 3,
+				maxsize = radius * 5,
+				texture = particle_texture,
+				glow = 5
+		})
+	end
+
 	minetest.sound_play("tnt_explode", {pos = pos, gain = 1.5, max_hear_distance = math.min(radius * 20, 128)})
 
 end