Unify trail definition for both hitscan and bullet weapons (closes #10)

DOCS.md

@@ -77,10 +77,11 @@ Actions are tables containing info about how they should work. Actions also supp
   * It takes either a Minetest physics table or the string `"FREEZE"`, which will block the player
   * If this parameter is declared, `slow_down_user` won't get called
 * `sound`: (string) ⚡️🥏👊 the sound to play when the action is run
-* `trail`: (table) ⚡️👊 the trail the action should leave. Fields are:
-  * `image`: (string) the particle to spawn
-  * `amount`: (int) how many particles to draw along the line
-  * `size`: (int) the size of each particle
+* `trail`: (table) ⚡️🥏👊 the trail the action should leave. Fields are:
+  * `image`: (string) the particle to spawn -- TODO: rendi obbligatorio
+  * `amount`: (int) how many particles to draw along the line. In `bullet` type it's the amount to spawn every second. Defaults to `5` in non bullet types and to `2` in bullet types
+  * `size`: (int) the size of each particle. Default is `1`
+  * `life`: (int) how's gonna last, in seconds. Default is `0.3`
 * `on_use`: (function(player, weapon, action, \<pointed_thing>)) ⚡️🥏👊 additional behaviour when the action is successfully run
   * `pointed_thing` is only passed with custom and punch action types
   * if `continuous_fire` is on, the callback is run repeatedly

src/api/bullets.lua

@@ -23,6 +23,7 @@ end
 ----------------------------------------------
 
 function generate_entity(w_name, def, action)
+
   local bullet = {
     initial_properties = {
       name = def.name,
@@ -48,7 +49,7 @@ function generate_entity(w_name, def, action)
     _explosion = def.explosion,
     _remove_on_contact = def.remove_on_contact,
 
-    _bullet_trail = def.trail, -- TODO: time qui è expirationtime (life?); amount qui è interval (amount?)
+    _bullet_trail = action.trail,
     _spawn_particle_time = 0,
 
     _gravity = def.gravity,
@@ -59,6 +60,12 @@ function generate_entity(w_name, def, action)
     _is_sliding = false, -- per capire se si sta muovendo su superfici piane (granate)
   }
 
+  -- più chiaro di amount, ma al tempo stesso mantengo standard con altre armi nella dichiarazione
+  if bullet._bullet_trail then
+    bullet._bullet_trail.interval = 20 / (bullet._bullet_trail.amount or 2)
+    bullet._bullet_trail.amount = nil
+  end
+
   function bullet:_destroy()
     if self._explosion then
       spawn_particles_sphere(self.object:get_pos(), self._explosion.texture)
@@ -95,7 +102,7 @@ function generate_entity(w_name, def, action)
 
 
   function bullet:on_step(dtime, moveresult)
-    self._curr_lifetime = self._curr_lifetime + dtime
+    self._curr_lifetime = self._curr_lifetime + (dtime * 1.6) -- per convertire in secondi
 
     if self._curr_lifetime >= self._lifetime then
       self:_destroy()
@@ -112,9 +119,9 @@ function generate_entity(w_name, def, action)
       -- Aggiunge le particelle di tracciamento
       minetest.add_particle({
         pos = obj:get_pos(),
-        velocity = vector.divide(velocity, 2),
+        velocity = vector.divide(velocity, 5),
         acceleration = vector.divide(obj:get_acceleration(), -5),
-        expirationtime = self._bullet_trail.life,
+        expirationtime = self._bullet_trail.life or 0.3,
         size = self._bullet_trail.size,
         texture = self._bullet_trail.image
       })

src/api/weapons.lua

@@ -680,7 +680,6 @@ function attack_bullet(user, action)
 
   -- TODO: non si può fare su on_activate quello che segue?
   local bullet_ent = bullet:get_luaentity()
-  bullet_ent._action = table.copy(action)
 
   local speed = bullet_ent._speed
   local dir = user:get_look_dir()
@@ -942,8 +941,8 @@ function draw_particles(particle, dir, origin, range, pierce)
   local check_coll = not pierce
 
   minetest.add_particlespawner({
-    amount = particle.amount,
-    time = 0.3,   -- TODO: meglio funzione che approssima distanza? Time era 0.3, min/max erano impact_dist/(range * 1.5)
+    amount = particle.amount or 5,
+    time = particle.life or 0.3,
     pos = vector.new(origin),
     vel = vector.multiply(dir, range),
     size = particle.size or 1,

src/tests/test3.lua

@@ -27,6 +27,13 @@ weapons_lib.register_weapon("weapons_lib:test3", {
     -- TODO: trail direttamente nel proiettile o mantengo coerenza con armi generiche?
     -- `damage` x es. ora lo prende da qua, non da proiettile; eviterei forse 1 e 1
 
+    trail = {
+      image = "test1_trail2.png",
+      life = 1,
+      size = 2,
+      amount = 5, -- 20/amount
+    },
+
     bullet = {
       name = "weapons_lib:bullet_test", -- TODO: ha senso impostare il nome?
 
@@ -48,13 +55,6 @@ weapons_lib.register_weapon("weapons_lib:test3", {
       gravity = false,
 
       -- TODO particelle per quando svanisce? Tipo effetto fumo
-
-      trail = {
-        image = "test1_trail2.png",
-        life = 1,
-        size = 2,
-        interval = 5, -- in step
-      }
     },
   },