updatedshmup.p8

@@ -397,6 +397,23 @@ function dropshadow(str, x, y, col)
  print(str, x, y, col)
 end
 
+function grab_p1_butts()
+ if state ~= game then
+  local r = {0,0,0,0,0}
+  r[0] = 0
+  return r
+ end
+ local b = btn()
+ return {
+  [0]=b&0x1,
+  [1]=(b&0x2)>>1,
+  [2]=(b&0x4)>>2,
+  [3]=(b&0x8)>>3,
+  [4]=(b&0x10)>>4,
+  [5]=(b&0x20)>>5
+ }
+end
+
 -->8
 --ship behavior
 
@@ -431,12 +448,12 @@ 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()
- if (shoot_main) self:maybe_shoot(self.main_gun)
- if (shoot_spec) self:maybe_shoot(self.special_gun)
- 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)
- self.xmomentum += dx
- self.ymomentum += dy
+ butt = self:grab_butts()
+ if (butt[5] > 0) self:maybe_shoot(self.main_gun)
+ if (butt[4] > 0) self:maybe_shoot(self.special_gun)
+ if (butt[0]-butt[1] ~= 0 or butt[2]-butt[3] ~= 0) spark(self.sparks, self.x + 4*self.size, self.y + 4*self.size, butt, self.thrust, self.sparkodds)
+ self.xmomentum += (self.thrust * butt[1]) - (self.thrust * butt[0])
+ self.ymomentum += (self.thrust * butt[3]) - (self.thrust * butt[2])
  self.xmomentum = mid(-self.maxspd, self.maxspd, self.xmomentum)
  self.ymomentum = mid(-self.maxspd, self.maxspd, self.ymomentum)
  
@@ -852,18 +869,16 @@ player = ship_m.new{
  thrust = 0.25, -- momentum added from button
  drag = 0.125, -- 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
-  if blr == 1 then
-   self.sprite=17
-  elseif blr==2 then
-   self.sprite=18
+ grab_butts = function(self)  -- fetch buttons
+  local butts = grab_p1_butts()
+  if butts[0] == butts[1] then
+   self.sprite = 1
+  elseif butts[0] > 0 then
+   self.sprite = 17
   else
-   self.sprite=1
+   self.sprite = 18
   end
-  --dx, dy, shoot_spec, shoot_main
-  return (((b&0x2)>>1) - (b&0x1)) * th, (((b&0x8)>>3) - ((b&0x4)>>2)) * th, (b&0x10) > 0, (b&0x20) > 0
+  return butts
  end
 }
 mknew(player,
@@ -897,12 +912,18 @@ frownie = ship_m.new{
  thrust = 0.12, -- momentum added from button
  drag = 0.07, -- momentum lost per frame
  slip = true,
- act = function(self)
-  local tstate,dx = (1 + flr(4*t() + 0.5)) % 6,0
-  if (tstate==1 or tstate==2) dx=-self.thrust
-  if (tstate>=4) dx=self.thrust
-  return dx,0,false,false
- end,
+ grab_butts = function(discard_self)
+  -- buttons are effectively analog
+  -- and negative buttons work just fine!
+  local butts = {}
+  local tstate = (1 + flr(4*t() + 0.5)) % 6
+  butts[0] = ((tstate==1 or tstate==2) and 1) or 0
+  butts[1] = ((tstate==4 or tstate==5) and 1) or 0
+  for b=2, 5 do
+   butts[b]=0
+  end
+  return butts
+ end, -- button fetch algorithm
 }
 mknew(frownie)
 
@@ -941,9 +962,10 @@ spewy = frownie.new{
  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, true
+ grab_butts=function()
+  local butts=frownie.grab_butts()
+  butts[5]=1
+  return butts
  end
 }
 mknew(spewy, function(ship)
@@ -978,11 +1000,12 @@ mknew(chasey, function(ship)
  ship.main_gun=ship.main_gun or zap_gun.new{enemy=true}
 end)
 
-function chasey:act()
- local dx = 0
- if (self.x < primary_ship.x) dx=self.thrust
- if (self.x > primary_ship.x) dx=-self.thrust
- return dx, 0, false, self.x - 16 < primary_ship.x and self.x + 16 > primary_ship.x
+function chasey:grab_butts()
+ local butts = {[0]=0,0,0,0,0,0}
+ if (self.x < primary_ship.x) butts[1] = 1
+ if (self.x > primary_ship.x) butts[0] = 1
+ if (self.x - 16 < primary_ship.x and self.x + 16 > primary_ship.x) butts[5] = 1
+ return butts
 end
 
 xl_chasey=chasey.new{
@@ -998,10 +1021,10 @@ xl_chasey=chasey.new{
  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
-  return dx,dy,shoot_spec,shoot_main
+ grab_butts = function(self)
+  local butts = chasey.grab_butts(self)
+  if (self.y < 4) butts[3] = 1
+  return butts
  end,
  draw = function(self)
   if(self.fx_pal) pal(self.fx_pal)
@@ -1487,12 +1510,18 @@ like a player pushing buttons.
 the player ship actually reads
 buttons for this.
 
-act -- returns new acceleration:
-dx, dy, shoot_spec, shoot_main.
-dx and dy are change in momentum
-in px/frame. this is controls
-only -- friction is handled in
-ship:move (`drag` value).
+grab_butts - ship thrust control
+based on btn() api. returns a
+table indexed from 0..5 with
+0 to not push this button and 1
+to push it. ships can use
+fractional or out-of-range
+numbers to get varying amounts
+of thrust, including using
+negative numbers for thrust in
+the opposite direction. 4 and 5
+just check for nonzeroness to
+attempt to fire.
 
 ships hitting another ship take
 1 damage per frame of overlap.
@@ -1771,7 +1800,9 @@ function boom(x,y,boominess,is_boss)
  local boombonus = min(0.05 * boominess, 1.25)
  for _=1,boominess do
   local angle = rnd(1)
-  spark(sp,x+4,y+4,cos(angle), sin(angle),boombase+rnd(boombonus),1, true)
+  local butts = {0, sin(angle), 0}
+  butts[0] = cos(angle)
+  spark(sp,x+4,y+4,butts,boombase+rnd(boombonus),1, true)
  end
  return
 end
@@ -1791,16 +1822,17 @@ function spark_particle:draw()
  pset(self.x,self.y,self.sprs[self.sidx])
 end
 
-function spark(sprs, x, y, dx, dy, odds, fg)
+function spark(sprs, x, y, butts, thrust, odds, fg)
  if (sprs==nil or flr(rnd(odds)) ~= 0) return
+ thrust *= 2.5
  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,
-  dy = dy + rnd(2) - 1,
+  dx = (butts[0] - butts[1]) * thrust + rnd(2) - 1,
+  dy = (butts[2] - butts[3]) * thrust + rnd(2) - 1,
  })
 end
 -->8