vacuum_gambit.p8

@@ -339,10 +339,10 @@ function drawhud()
  draw_gun_info("❎",1,116,3,primary_ship.main_gun)
  draw_gun_info("🅾️",1,116,31,primary_ship.special_gun)
  
- dropshadow("x h",114,59,1)
+ dropshadow("p h",114,59,1)
  inset(114,66,119,125)
  fillp(0x5a5a)
- vertmeter(115,67,118,124,primary_ship.xp, primary_ship.xptarget, powcols)
+ vertmeter(115,67,118,124,primary_ship.power, primary_ship.max_power, powcols)
 
  inset(120,66,125,125)
  -- 57 px vertically
@@ -425,9 +425,14 @@ ship_m = mknew{
  -- ships have no shield by default
  shield = 0,
  maxshield = 0,
+ shieldcost = 32767.9,
  shieldcooldown =  0x0.003c,--1s
  shieldpenalty = 0x0.012c, --5s
  
+ max_power = 120,
+ power = 120,
+ generator = 2, -- power gen per frame
+ 
  slip = true,  -- most enemies slide
  
  xmomentum = 0,
@@ -487,6 +492,7 @@ end
 
 function ship_m:move()
  self:refresh_shield()
+ self.power = min(self.max_power, self.power + self.generator)
  local dx, dy, shoot_spec, shoot_main = self:act()
  dx = self:constrain(self.x, self.xmomentum, self.xmin, self.xmax, dx)
  dy = self:constrain(self.y, self.ymomentum, self.ymin, self.ymax, dy)
@@ -528,7 +534,9 @@ end
 
 function ship_m:maybe_shoot(gun)
  if (not gun) return
- return gun:shoot(self.x + self.fire_off_x, self.y + self.fire_off_y)
+ if (self.power < gun.power) return
+ if (not gun:shoot(self.x + self.fire_off_x, self.y + self.fire_off_y)) return
+ self.power -= gun.power
 end
 
 function ship_m:hitship(other)
@@ -569,8 +577,10 @@ end
 function ship_m:refresh_shield()
  if (self.shield >= self.maxshield) return
  if (lframe < self.shield_refresh_ready) return
+ if (self.power < self.shieldcost) return
  self.shield += 1
  self.shield = min(self.shield, self.maxshield)
+ self.power -= self.shieldcost
  self.shield_refresh_ready = lframe + self.shieldcooldown
 end
 
@@ -585,28 +595,6 @@ function enemy_blt_cat()
  return ebullets
 end
 
--- x, y: position
--- dx, dy: movement (linear)
--- f: frames remaining; nil for no limit
--- sprite: what sprite to draw
--- hurt -- hurtbox
--- width, height -- in sprites
--- x_off, y_off -- how to
---   initially position relative
---   to firing point. weird
---   details, check impl
--- damage -- damage to do to
---   a ship that gets hit
--- category -- function that
---   returns which bullet list
---   to spawn onto
--- hitship -- event handler,
---   takes ship as argument.
---   default: die, return true.
---   returns whether to delete
---   the bullet
--- die -- on-removal event,
---   default no-op
 bullet_base = mknew{ }
 
 gun_base = mknew{ 
@@ -625,8 +613,7 @@ end
 function bullet_base:move()
  self.x += self.dx
  self.y += self.dy
- if (self.f) self.f -= 1
+ if (self.y > 128) or (self.y < -8 * self.height) then
- if (self.y > 128) or (self.y < -8 * self.height) or (self.f and self.f < 0) then
   self:die()
   return true
  end
@@ -667,7 +654,7 @@ end
 
 zap_e = mknew(bullet_base.new{
  --shape
- sprite = 9, --index of ammo sprite
+ sprite = 9, --index of enemy ammo sprite
  width = 1, --in 8x8 blocks
  height = 1,
  hurt = { -- hurtbox - where this ship can be hit
@@ -696,6 +683,7 @@ zap_p = mknew(zap_e.new{
 })
 
 zap_gun_e = mknew(gun_base.new{
+ power = 20, -- power consumed per shot
  cooldown = 0x0.000a, -- frames between shots
  ammo = nil, -- unlimited ammo - main gun
  actually_shoot = spawn_one(zap_e),
@@ -752,6 +740,7 @@ blast = mknew(bullet_base.new{
 
 blast_gun = mknew(gun_base.new{
  icon = 13,
+ power = 0, -- only cost is ammo
  cooldown = 0x0.0020, -- frames between shots
  ammo = 5,
  maxammo = 5,
@@ -787,6 +776,7 @@ protron_p = mknew(protron_e.new{
 
 protron_gun_e = mknew(gun_base.new{
  icon = 25,
+ power = 60,
  cooldown = 0x0.000f, -- frames between shots
  ammo = nil,
  maxammo = nil,
@@ -848,6 +838,7 @@ vulcan_p = mknew(vulcan_e.new{
 vulcan_gun_e = mknew(gun_base.new{
  icon = 37,
  enemy = false,
+ power = 8,
  cooldown = 0x0.0002, -- frames between shots
  ammo = nil,
  maxammo = nil,
@@ -889,16 +880,13 @@ player = mknew(ship_m.new{
  sparkodds = 2,
  boss = true,  -- dramatic special effects
  
- -- health
+ -- health and power
  hp = 3, -- current health, non-regenerating
  maxhp = 3, -- player only; other ships never heal
- shield = 2, -- regenerates
+ shield = 2, -- regenerates, using power
  maxshield = 2,
-
+ shieldcost = 60, -- power cost to refill shield
- -- xp, increments of 0x0.01
+ generator = 2, 
- xp = 0,
- xptarget = 0x0.05,
- level = 1,
 
  -- gun
  main_gun = nil, -- assign at spawn time
@@ -954,7 +942,7 @@ frownie = mknew(ship_m.new{
  sparks = smokespark,
  sparkodds = 8,
  
- -- health
+ -- health and power
  hp = 0.5, -- enemy ships need no max hp
 
  -- position
@@ -996,6 +984,7 @@ blocky = mknew(frownie.new{
 
 spewy = mknew(frownie.new{
  sprite=26,
+ power=-20,
  hurt = {
   x_off=0,
   y_off=1,
@@ -1003,11 +992,13 @@ spewy = mknew(frownie.new{
   height=5
  },
  hp=0.5,
+ maxpower=70,
+ generator=0.5,
  fire_off_x=4,
  fire_off_y = 7,
  act=function(self)
   local dx,dy,shoot_spec=frownie.act(self)
-  return dx, dy, shoot_spec, self.y > 10
+  return dx, dy, shoot_spec, true
  end,
  init = function(ship)
   ship.main_gun=ship.main_gun or protron_gun_e.new{}
@@ -1028,6 +1019,7 @@ chasey = mknew(ship_m.new{
  hp = 1.5,
  shield = 1,
  maxshield = 1,
+ shieldcost = 180,
 
  fire_off_x = 4,
  fire_off_y = 7,
@@ -1045,7 +1037,7 @@ chasey = mknew(ship_m.new{
 function chasey:act()
  self.xmin = max(primary_ship.x-8, 0)
  self.xmax = min(primary_ship.x + 8, 112 - 8*self.size)
- return 0, 0, false, self.y > 10 and self.x - 16 < primary_ship.x and self.x + 16 > primary_ship.x
+ return 0, 0, false, self.x - 16 < primary_ship.x and self.x + 16 > primary_ship.x
 end
 
 xl_chasey=mknew(chasey.new{
@@ -1463,6 +1455,10 @@ algorithm expressed.
 
 guns
 ----
+* power - cost in generator
+  power to fire. may be 0.
+  field directly read by ships;
+  required in all guns.
 * t - metatable for bullet type.
   fired once in the bullet's
   default direction per shot.
@@ -1490,6 +1486,11 @@ actually_shoot to change
 projectile logic while keeping
 cooldown and ammo logic.
 
+ships manage generator power
+before asking the gun to shoot.
+this behavior is in
+ship_m:maybe_shoot.
+
 bullets
 -------
 * dx, dy - movement per frame.
@@ -1576,19 +1577,39 @@ or less hp calls self:die() and
 tells the main game loop to
 remove it.
 
-shieldcooldown is the interval
+ships have power, from 0 to
-between restoring shield points.
+ship.maxpower, increasing by
-shieldpenalty is the delay
+ship.generator per frame.
-before restoring points after
+in maybe_shoot, ships check that
-any damage, reset to this value
+they have power to fire before
-on every damaging hit (whether
+trying to fire (the gun itself
-it is absorbed by the shield or
+checks ammo and cooldown), and
-not) -- shield behaves like
+spend that power if they fire.
-halo and other shooters in its
+
-heritage, where it recovers if
+power is also used to restore
-you avoid damage for a while.
+shields - ship.shieldcost per
-not that there is any safe cover
+point of shields. shieldcooldown
-in this kind of game.
+is the interval between
+restoring shield points, which
+is reset to shieldpenalty when a
+ship takes damage (regardless of
+whether that damage is stopped
+by the shield or not).
+shieldpenalty is much worse than
+shieldcooldown (hALO shield).
+
+therefore:
+* damaged ships spend power
+  repairing shields, which may
+  affect ability to fire guns.
+  this looks like a slow firing
+  rate because the ship will
+  eventually recover enough
+  energy to fire.
+* a ship firing nonstop will
+  typically be unable to recover
+  any shields because it will
+  not have energy to do so.
 
 ships do not repair hp on their
 own. negative-damage bullets