midpoint based dolphin positioning

vacation.p8

@@ -473,25 +473,33 @@ phinstate_nrm = {
  ws=3,
  hs=2,
  p=phin_nrm_pal,
- floaty=true,
+ idle=true,
+ xo=-12,
+ yo=-8,
 }
 phinstate_jump_full = {
  s={7},
  ws=2,
  hs=3,
  p=phin_nrm_pal,
+ xo=-4,
+ yo=-8, 
 }
 phinstate_jump_wane = {
  s={1},
  ws=3,
  hs=3,
  p=phin_nrm_pal,
+ xo=-12,
+ yo=-8,
 }
 phinstate_crest = {
  s={4},
  ws=3,
  hs=2,
  p=phin_nrm_pal,
+ xo=-12,
+ yo=-8,
 }
 phinstate_fall_wax = phinstate_jump_wane
 phinstate_fall_full = phinstate_jump_full
@@ -500,26 +508,34 @@ phinstate_dive_full = {
  ws=2,
  hs=3,
  p=phin_uw_pal,
+ xo=-4,
+ yo=-16,
 }
 phinstate_dive_wane = {
  s={1},
  ws=3,
  hs=3,
  p=phin_uw_pal,
+ xo=-12,
+ yo=-16,
 }
 phinstate_return = {
  s={4},
  ws=3,
  hs=2,
  p=phin_uw_pal,
+ xo=-12,
+ yo=-8,
 }
 phinstate_rise_wax = phinstate_dive_wane
 phinstate_rise_full = phinstate_dive_full
 
-
+-- coordinates are the notional
+-- center point of the dolphin.
+-- many states are off-center.
 toyphin = {
- x=-24,
+ x=-12,
- y=56,
+ y=64,
  dy=0,
  state=phinstate_nrm
 }
@@ -529,18 +545,45 @@ function toyphin:update()
  -- entry mode?
  if not self.entered then
   self.x += 1
-  self.entered = self.x >= 4
+  self.entered = self.x >= 16
+ elseif self.exiting then
+  if self.x > 128 then
+   self.exited = true
+  else
+   self.x += 1
+  end
  end
- -- TODO: switch states, do physics, etc.
+
- -- prepare for collision detection
+ -- button handling
- self.w=self.state.ws*8
+ if self.entered and not self.exiting and not self.launching then
- self.h=self.state.hs*8
+  if self.state.idle then
+   --TODO: launch
+  else
+   --TODO: nudge momentum
+  end
+ end
+ if self.launching then
+  --TODO: advance launch mode
+ end
+
+ --TODO: gravity
+ --TODO: crossing 64
+
+ -- test mode
+ --if (btn(5)) self.exiting = true
+ 
+end
+
+-- hitbox for current state
+function toyphin:box()
+ local st = self.state
+ return self.x + st.xo, self.y + st.yo, st.ws * 8, st.hs * 8
 end
 
 function toyphin:draw()
  local st, y = self.state, self.y
- if (st.floaty) y += wave()
+ if (st.idle) y += wave()
- spr(st.s[1+(((t()<<1)&0x0.FFFF*#st.s)&0x7FFF)], self.x, y, self.state.ws, self.state.hs)
+ spr(st.s[1+(((t()<<1)&0x0.FFFF*#st.s)&0x7FFF)], self.x + st.xo, y + st.yo, self.state.ws, self.state.hs)
 end
 
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