Show approximation of contact zone

lots of things rely on exactly one primary ship now, so this was just
overhead and wasted tokens / cspace.

collisiontest.p8

@@ -0,0 +1,143 @@
+pico-8 cartridge // http://www.pico-8.com
+version 42
+__lua__
+bx0=0
+by0=0
+bx1=127
+by1=127
+lx0=0
+ly0=0
+lx1=127
+ly1=127
+
+-->8
+
+function collides()
+	local tmin=0
+	local tmax=1
+	
+	local ldx=lx1-lx0
+	local ldy=ly1-ly0
+	
+	
+	-- x
+	if ldx==0 then
+		local lx=lx0 -- which ==lx1
+		if (lx<bx0 or lx>=bx1) return nil
+	else
+ 	local tx0=(bx0-lx0)/ldx
+ 	local tx1=(bx1-lx0)/ldx
+ 	
+ 	tmin=max(tmin,min(tx0,tx1))
+ 	tmax=min(tmax,max(tx0,tx1))
+ end
+ 
+	if ldy==0 then
+		local ly=ly0 -- which ==ly1
+		if (ly<by0 or ly>=by1) return nil
+	else
+ 	local ty0=(by0-ly0)/ldy
+ 	local ty1=(by1-ly0)/ldy
+ 	
+ 	tmin=max(tmin,min(ty0,ty1))
+ 	tmax=min(tmax,max(ty0,ty1))
+ end 
+ 
+ if (tmax < tmin) return nil
+ return tmin,tmax
+end
+
+
+-->8
+function _init()
+	poke(0x5f2d,1) -- enable mouse
+end
+
+function _bounce_screen(x)
+ return _bounce(x*128,128)
+end
+function _bounce(x,mx)
+	x=x%(mx * 2)
+	if (x>=mx)return mx-(x-mx)
+	return x
+end
+
+function _to_halfopen(x0,x1)
+ -- turn two numbers into a
+ -- half-open integer range
+ x0=flr(x0)
+ x1=flr(x1)
+ local lo=min(x0,x1)
+ local hi=max(x0,x1)
+ if (hi==lo) return lo,hi
+ return lo,hi-1
+end
+
+function _update60()
+ local t=time()/16
+ 
+	local bx0_=_bounce_screen(t*1)
+	local by0_=_bounce_screen(t*2)
+	local bx1_=_bounce_screen(t*3)
+	local by1_=_bounce_screen(t*4)
+	
+	bx0,bx1=_to_halfopen(bx0_,bx1_)
+	by0,by1=_to_halfopen(by0_,by1_)
+	
+	update_line()
+	
+	--[[
+ local lx0_=_bounce_screen(t*1.5)
+ local ly0_=_bounce_screen(t*2.5)
+ local lx1_=_bounce_screen(t*3.5)
+ local ly1_=_bounce_screen(t*4.5)
+	
+	lx0,lx1=lx0_,lx1_
+	ly0,ly1=ly0_,ly1_
+	]]--
+end
+
+was_down=false
+last_mx,last_my=nil,nil
+
+function update_line()
+ local mx,my=stat(32),stat(33)
+ local is_down=stat(34)!=0
+
+ if is_down then
+  if was_down then
+   lx1,ly1=mx,my
+  else
+  	lx0,ly0=mx,my
+  end
+ end
+ was_down=is_down
+ last_mx,last_my=mx,my
+end
+-->8
+function _draw()
+ cls(0)
+	rect(bx0,by0,bx1,by1,6)
+	line(lx0,ly0,lx1,ly1,2)
+	local cmin, cmax = collides()
+	if cmin then
+	 local dx,dy=lx1-lx0,ly1-ly0
+	 line(lx0 + dx*cmin,
+	      ly0 + dy*cmin,
+	      lx0 + dx*cmax,
+	      ly0 + dy*cmax,
+	      8)
+	 pset(lx0 + dx*cmin,
+	      ly0 + dy*cmin,
+	      10)
+	end
+	
+	pset(last_mx,last_my,7)
+end
+__gfx__
+00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
+00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
+00700700000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
+00077000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
+00077000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
+00700700000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

vacuum_gambit.p8

@@ -29,23 +29,33 @@ end
 -- if tt.init is defined, generated
 -- new calls tt.init(ret) after
 -- ret is definitely not nil,
--- before calling setmetatable.
+-- after calling setmetatable.
 -- use to initialize mutables.
 --
 -- if there was a previous new,
--- it is invoked on the new
+-- it is invoked before
--- object *after* more, because
+-- setting tt's metatable, so
--- this works better with the
+-- each new will see its
--- `more` impls i use.
+-- inheritance chain.
 function mknew(tt)
- local mt,oldnew,more = {__index=tt},tt.new,rawget(tt, "init")
+ local mt,oldinit,more = {__index=tt},tt.superinit,rawget(tt, "init")
  tt.new=function(ret)
   if(not ret) ret = {}
-  if(more) more(ret)
+  ret.new = false
-  if(oldnew) oldnew(ret)
   setmetatable(ret, mt)
+  if(oldinit) oldinit(ret)
+  if (more) more(ret)
   return ret
  end
+
+ if oldinit and more then
+  tt.superinit = function(ret)
+   oldinit(ret)
+   more(ret)
+  end
+ elseif more then
+  tt.superinit = more
+ end
  return tt
 end
 
@@ -159,8 +169,6 @@ function wipe_game()
  xpwhoosh = nil
  primary_ship = player.new()
  init_hpcols()
- pships = linked_list.new()
- pships:push_back(primary_ship)
  eships = linked_list.new()
  pbullets = linked_list.new()
  ebullets = linked_list.new()
@@ -198,7 +206,8 @@ function ones(n)
 end
 
 function updategame()
- if (primary_ship.xp >= primary_ship.xptarget) and (gframe - primary_ship.last_xp_frame > 0x0.000f) and (not primary_ship.dead) then
+ local ps = primary_ship
+ if (ps.xp >= ps.xptarget) and (gframe - ps.last_xp_frame > 0x0.000f) and (not ps.dead) then
   mode = rearm_mode.new()
   return _update60()
  end
@@ -228,36 +237,24 @@ function updategame()
  end
  events:vore(new_events)
  events:strip(call_move)
- for _, lst in ipairs{intangibles_bg, pships, eships, pbullets, ebullets} do
+ for _, lst in ipairs{intangibles_bg, eships, pbullets, ebullets} do
   lst:strip(call_move)
  end
 
- pships:strip(
+ if not ps.dead then
-  function(ps)
+  ps:move()
-   local pbox, pded = hurtbox(ps), false
+  local pbox = hurtbox(ps)
-   eships:strip(
+  eships:strip(function(es)
-    function(es)
+   if(not collides(pbox, hurtbox(es))) return
-     if (not collides(pbox, hurtbox(es))) return
+   ps:hitship(es)
-     pded = pded or ps:hitship(es)
+   return es:hitship(ps)
-     return es:hitship(ps)
+  end)
-    end
+  ebullets:strip(function(eb)
-   )
+   if (not collides(pbox, hurtbox(eb))) return
-   return pded
+   ps:hitbullet(eb)
-  end
+   return eb:hitship(ps)
- )
+  end)
- pships:strip(
+ end
-  function(ps)
-   local pbox, pded = hurtbox(ps), false
-   ebullets:strip(
-    function(eb)
-     if (not collides(pbox, hurtbox(eb))) return
-     pded = pded or ps:hitbullet(eb)
-     return eb:hitship(ps)
-    end
-   )
-   return pded
-  end
- )
 
 	-- many bullets and many enemy ships;
 	-- use bucket collider for efficiency
@@ -292,9 +289,9 @@ function updategame()
 	if waves_complete == 32767 and not eships.next and not ebullets.next and not events.next then
 	  game_state = win
 	end
-	if (not pships.next) game_state = lose
+	if (ps.dead) game_state = lose
 
- if primary_ship.xp >= primary_ship.xptarget then
+ if ps.xp >= ps.xptarget then
   if not xpwhoosh then
    xpwhoosh = 0
   else
@@ -383,8 +380,8 @@ end
 function drawgame()
  clip(0,0,112,128)
  rectfill(0,0,112,128,0)
- for slist in all{intangibles_bg, pbullets, pships, eships, ebullets, intangibles_fg} do
+ for drawable in all{intangibles_bg, pbullets, primary_ship, eships, ebullets, intangibles_fg} do
-  slist:draw()
+  drawable:draw()
  end
  clip(0,0,128,128)
  drawhud()
@@ -520,8 +517,6 @@ ship_m = mknew{
  shieldpenalty = 0x0.012c, --5s
  shield_refresh_ready = 0,
  
- slip = true,  -- most enemies slide
- 
  xmomentum = 0,
  ymomentum = 0,
 
@@ -605,25 +600,18 @@ function ship_m:move()
  self:maybe_shoot(self.main_gun)
  if (shoot_spec1 and self.special_guns) self:maybe_shoot(self.special_guns[1])
  if (shoot_spec2 and self.special_guns) self:maybe_shoot(self.special_guns[2])
- if (dx ~= 0 or dy ~= 0) spark(self.sparks, self.x + 4*self.size, self.y + 4*self.size, dx*2.5, dy*2.5, self.sparkodds)
+ spark(self.sparks, self.x + 4*self.size, self.y + 4*self.size, dx*2.5, dy*2.5, self.sparkodds)
  self.xmomentum = self:calc_velocity(self.xmomentum, dx)
  self.ymomentum = self:calc_velocity(self.ymomentum, dy)
 
  self.x += self.xmomentum
  self.y += self.ymomentum
- 
+
- -- "scrolling" behavior
- if self.slip then
-  self.y += scrollrate
-  if self.y >= 128 then
-   self:die()
-   return true
-  end
- end
  return false
 end
 
 function ship_m:draw()
+ if (self.dead) return
  if(self.fx_pal) pal(self.fx_pal)
  spr(self.sprite, self.x, self.y, self.size, self.size)
  pal()
@@ -719,6 +707,10 @@ bullet_base = mknew{ }
 
 gun_base = mknew{ 
  shoot_ready = -32768,
+ new_clip = -32768,
+ clip_size = false,
+ clip_remain = 0,
+ clip_interval = 0x0.80,
  icon = 20,
  ammobonus = 1,
 
@@ -726,6 +718,27 @@ gun_base = mknew{
  -- cooldown reduction from
  -- upgrades, not yet applied
  cd_remainder = 0,
+
+ veloc = 1,
+ aim = 0.75, -- down; 0.25, or -0.75, is up
+ shot_idx = 0,
+ -- shots: list<list<[3]num>>
+ --  describing a cycling
+ --  firing pattern. shot_idx
+ --  tracks offset into pattern.
+ -- each nested list: a burst
+ --  of shots to fire; takes
+ --  1 ammo; sequential
+ -- each shot: angle (turns,
+ --  relative to `aim`),
+ --  firing x-offset, velocity;
+ --   if x-offset is nil, use 0;
+ --   if velocity is nil, use
+ --    self.veloc instead
+
+ init = function(self)
+  if (not self.shots) self.shots = {{{0}}}
+ end
 }
 
 -- gun_base subtypes are
@@ -750,12 +763,6 @@ function gun_base:peel()
  self.munition = mknew(self.munition.new())
 end
 
--- default firing behavior:
--- single shot
-function gun_base:actually_shoot(x, y)
- self.munition.new{}:spawn_at(x, y)
-end
-
 -- upgrade 
 function gun_base:small_upgrade_opts()
  local ret = {
@@ -849,15 +856,56 @@ end
 
 function gun_base:shoot(x, y)
  if (gframe < self.shoot_ready) return false
+ local csz,crm = self.clip_size, self.clip_remain
+ if csz then
+  if crm < csz and gframe >= self.new_clip then
+   self.clip_remain = csz
+   self.new_clip = gframe + self.clip_interval
+  elseif crm == 0 then
+   return false
+  end
+ end
  if self.ammo then
   if (self.ammo <= 0) return false
   self.ammo -= 1
  end
+ if csz then
+  self.clip_remain -= 1
+ end
  self.shoot_ready = gframe + self.cooldown
  self:actually_shoot(x, y)
  return true
 end
 
+function gun_base:actually_shoot(x, y)
+ local shots,veloc,aim,munition = self.shots,self.veloc,self.aim,self.munition
+ local idx = self.shot_idx % #shots + 1
+ self.shot_idx = idx
+ shots = shots[idx]
+ for s in all(shots) do
+  local a,xo,v = unpack(s)
+  v = v or veloc
+  xo = xo or 0
+  -- reverse x-offset for negative base angle
+  if (aim < 0) xo = -xo
+  a += aim
+  -- todo: switch munition
+  --  depending on angle
+  --  (allows for non-round
+  --   sprites and hitboxes on
+  --   shots from guns with
+  --   widely varying angles)
+  local m = munition.new{}
+  -- todo: automatically make
+  -- high velocity shots do
+  -- multiple collision checks
+  m.dy = sin(a) * veloc
+  m.dx = cos(a) * veloc
+  m:spawn_at(x+(xo or 0), y)
+ end
+end
+
+
 -->8
 -- bullets and guns
 
@@ -876,8 +924,6 @@ zap_e = mknew(bullet_base.new{
  y_off = 8,
  
  damage = 1,
- dx = 0,  -- px/frame
- dy = 4,
 
  hitship = const_fxn(true),
 
@@ -886,19 +932,21 @@ zap_e = mknew(bullet_base.new{
 
 zap_p = mknew(zap_e.new{
  sprite = 8,
- dy = -8,
  y_off = 0,
  category = player_blt_cat,
 })
 
 zap_gun_e = mknew(gun_base.new{
  cooldown = 0x0.0020, -- frames between shots
+ veloc = 4,
  munition = zap_e,
 })
 
 zap_gun_p = mknew(zap_gun_e.new{
  icon = 19,
  munition = zap_p,
+ veloc = 8,
+ aim = 0.25,
  hdr = "mAIN gUN",
 })
 
@@ -955,6 +1003,7 @@ blast = mknew(bullet_base.new{
 blast_gun = mknew(gun_base.new{
  icon = 13,
  cooldown = 0x0.0078, -- 120 frames between shots
+ aim = -0.75,
  ammo = 5,
  maxammo = 5,
  munition = blast,
@@ -987,8 +1036,6 @@ protron_e = mknew(bullet_base.new{
  y_off = 4,
  
  damage = 1,
- dym = 0.5, -- gun sets dy;
-             -- this is mult
  category = enemy_blt_cat,
 })
 
@@ -1004,34 +1051,17 @@ protron_gun_e = mknew(gun_base.new{
  cooldown = 0x0.0040, -- frames between shots
  ammo = nil,
  maxammo = nil,
- munition = protron_e
+ munition = protron_e,
+ veloc = 2,
+ shots = {{{-0.25}, {-0.165}, {-0.0825}, {0}, {0.0825}, {0.165}, {0.25}}}
 })
 
-function protron_gun_e:actually_shoot(x, y)
- local m = self.munition.dym
- for i=1,3 do
-  local b = self.munition.new{
-   dx = i*m,
-   dy = (4-i)*m,
-  }
-  b:spawn_at(x,y)
-  local b2 = self.munition.new{
-   dx = -i*m,
-   dy = (4-i)*m,
-  }
-  b2:spawn_at(x,y)
- end
- local bup = self.munition.new{
-  dx=0,
-  dy=4*m,
- }
- bup:spawn_at(x,y)
-end
-
 protron_gun_p = mknew(protron_gun_e.new{
  munition = protron_p,
  maxammo = 20,
  cooldown = 0x0.0018,
+ veloc = 4,
+ aim = -0.75,
  hdr = "pROTRON",
  body = [[---------GUN
 
@@ -1060,41 +1090,37 @@ vulcan_e = mknew(bullet_base.new{
  y_off = 0,
  
  damage = 0.5,
- -- dx from gun
- dy = 2,
  category=enemy_blt_cat
 })
 
 vulcan_p = mknew(vulcan_e.new{
  sprite=22,
  y_off = 4,
- dy = -4,
  category=player_blt_cat
 })
 
 vulcan_gun_e = mknew(gun_base.new{
  icon = 37,
- enemy = false,
  cooldown = 0x0.0003, -- frames between shots
  ammo = nil,
  maxammo = nil,
  munition=vulcan_e,
- dxs = {0.35, -0.35, -0.7, 0.7, 0.35, -0.35},
+ veloc = 2,
- xoffs = {1, 0, -1, 1, 0, -1},
+ shots = {{{0.02, 2}}, {{-0.02,0}}, {{-0.03, -2}}, {{0.03, 2}}, {{0.02, 0}}, {{-0.02, -2}}}
- dxidx = 1,
+})
- actually_shoot = function(self, x, y)
+
-  local b = self.munition.new{
+machine_gun_e = mknew(vulcan_gun_e.new{
-   dx = self.dxs[self.dxidx],
+ icon = 38,
-  }
+ clip_size = 12,
-  b:spawn_at(self.xoffs[self.dxidx]+x,y)
+ clip_interval = 0x0.005a,
-  self.dxidx += 1
+ shots = {{{0, 2}}, {{0, -2}}}
-  if (self.dxidx > #self.dxs) self.dxidx = 1
- end
 })
 
 vulcan_gun_p = mknew(vulcan_gun_e.new{
  munition=vulcan_p,
  maxammo = 100,
+ aim=-0.75,
+ veloc=4,
  hdr = "vULCAN",
  body = [[---------GUN
 
@@ -1156,7 +1182,6 @@ player = mknew(ship_m.new{
  thrust = 0.1875, -- momentum added from button
  ymin = 0, ymax = 120, -- stay on screen
  drag = 0.0625, -- momentum lost per frame
- slip = false, -- does not slide down screen
  act = function(self)  -- fetch buttons
   local b,th = btn(),self.thrust
   local blr = b&0x3
@@ -1312,7 +1337,6 @@ chasey = mknew(ship_m.new{
  maxspd = 2,
  thrust = 0.2,
  drag = 0.075,
- slip = true,
 
  init = function(ship)
   ship.main_gun=ship.main_gun or zap_gun_e.new{}
@@ -1340,7 +1364,6 @@ xl_chasey=mknew(chasey.new{
  hp = 19.5,
  shield = 5,
  boss = true,
- slip = false,
  act = function(self)
   local dx,dy,shoot_spec,shoot_main = chasey.act(self)
   if (self.y < 4) dy=self.thrust
@@ -1351,9 +1374,6 @@ xl_chasey=mknew(chasey.new{
   sspr(40, 0, 8, 8, self.x, self.y, 16, 16)
   pal()
  end,
- init = function(ship)
-  ship.main_gun=ship.main_gun or zap_gun_e.new{}
- end,
 })
 
 -- flotilla ships
@@ -1365,16 +1385,20 @@ ship_f = mknew(ship_m.new{
  -- no sparks
  hp = 0.5,
  xp = 0x0.0001,
+ fire_off_x = 4,
+ fire_off_y = 4,
 
  maxspd = 3,
  thrust = 0.1,
  drag = 0.05,
- slip = false,
  act = function(self)
   local wx,wy=self.want_x,self.want_y
   self.xmin,self.xmax,self.ymin,self.ymax = wx,wx,wy,wy
   return 0,0,false,false
  end,
+ init = function(self)
+  if (self.gun_proto) self.main_gun = self.gun_proto.new()
+ end
 })
 
 ship_mook = mknew(ship_f.new{
@@ -1388,12 +1412,14 @@ ship_defender = mknew(ship_f.new{
 ship_turret = mknew(ship_f.new{
  sprite=106,
  xp = 0x0.0002,
+ gun_proto = machine_gun_e,
 })
 ship_skirmisher = mknew(ship_f.new{
  sprite=107,
  xp = 0x0.0004,
- spark = smokespark,
+ sparks = smokespark,
- sparkodds = 4,
+ sparkodds = 3,
+ fire_off_y = 7,
 })
 
 function rnd_spawn_loc()
@@ -1695,15 +1721,15 @@ function spark_particle:draw()
 end
 
 function spark(sprs, x, y, dx, dy, odds, fg)
- if (sprs==nil or flr(rnd(odds)) ~= 0) return
+ if (sprs==nil or flr(rnd(odds) or (abs(dx) < 0.5 and abs(dy))) ~= 0) return
  local target = fg and intangibles_fg or intangibles_bg
  target:push_back(spark_particle.new{
   x = x + rnd(4) - 2,
   y = y + rnd(4) - 2,
   sprs = sprs,
   sidx = 1,
-  dx = dx + rnd(2) - 1,
+  dx = dx * rnd(2),
-  dy = dy + rnd(2) - 1,
+  dy = dy * rnd(2),
  })
 end
 -->8
@@ -1809,6 +1835,7 @@ end
 
 -- add a new gun
 function spec_gun_opts()
+ -- todo: avoid duplicates
  return pick(spec_gunt, 2)
 end
 
@@ -1830,7 +1857,6 @@ end
 
 -- ordinary upgrades
 function small_opts()
- -- todo: include gun opts
  if(not primary_ship.special_guns) return pick(primary_ship:small_upgrade_opts(), 2)
  local opts = {rnd(primary_ship:small_upgrade_opts())}
  for g in all(primary_ship.special_guns) do
@@ -1911,7 +1937,10 @@ function rearm_mode:shuffle()
  -- until the upgrade deck
  -- is a thing that exists
  local lev = primary_ship.level + 1
- if lev == 4 or lev == 12 then
+
+ -- for testing: more guns really early
+ -- if lev == 4 or lev == 12 then
+ if lev == 2 or lev == 3 then
   self.options = spec_gun_opts()
  elseif lev % 4 == 0 then
   self.options = big_opts()