pico-8 cartridge // http://www.pico-8.com
version 41
__lua__
-- panel extreme
-- by kistaro windrider
-------------------------------

-- bsd 0-clause license
-------------------------------
-- copyright 2023 kistaro windrider
--
-- permission to use, copy,
-- modify, and/or distribute
-- this software for any
-- purpose with or without fee
-- is hereby granted.
--
-- the software is provided
-- "as is" and the author
-- disclaims all warranties
-- with regard to this software
-- including all implied
-- warranties of merchantability
-- and fitness. in no event
-- shall the author be liable
-- for any special, direct,
-- indirect, or consequential
-- damages or any damages
-- whatsoever resulting from
-- loss of use, data or profits,
-- whether in an action of
-- contract, negligence or
-- other tortious action,
-- arising out of or in
-- connection with the use or
-- performance of this software.
-------------------------------

-------------------------------
-- credits                    -
-------------------------------
-- wysiwyg p8scii control     -
--  code editor (used for all -
--  fancy text) -- eeooty     -
--  https://www.lexaloffle.com/bbs/?tid=52315
-------------------------------

-- major, release, revision
-- change major version to break
-- save compatibility
version={0,0,1}

-------------------------------
-- globals
-------------------------------
-- mode: table
--   {:update(), :draw()}.
--   receives frame callbacks.
-- version: [3]int constant.
--   major, minor, release.
--   change major version to
--   break save compatibility.
--   constant.
-------------------------------

function _init()
 cartdata("panel_extreme"..version[1])
 
 -- hi-color mode: 15 is bg
 -- set color 15 to gradient background
 poke(0x5f5f,0x3f)
 --blend lines
 memset(0x5f70,0xaa,16)
 
 mode = init_title()
end

function _update60()
 mode:update()
end

function _draw()
 mode:draw()
end

-- if t[mname] is a thing,
-- invoke it as a method. else,
-- try each object in t
function outer_or_each_opt(t, mname)
 local fun = t[mname]
 if fun then
  fun(t)
  return
 end
 foreach(t, function(o)
  local f = o[mname]
  if(f) f(o)
 end)
end

-- generate standard "overlay"
-- constructor for type tt.
-- if more is defined, generated
-- new calls more(ret) after
-- ret is definitely not nil
-- before calling setmetatable.
-- use to initialize mutables.
function mknew(tt, more)
 local mt = {__index=tt}
 -- check "more" only once ever
 if more then
  tt.new = function(ret)
   if (not ret) ret = {}
   more(ret)
   setmetatable(ret, mt)
   return ret
  end
 else
  tt.new=function(ret)
   if (not ret) ret = {}
   setmetatable(ret, mt)
   return ret
  end
 end
end

-->8
-- title
-- (currently a placeholder)

function init_title()

 pal({[0]=0x82,0x82,0x84,0x84,4,4,0x89,0x89,0x8e,0x8e,0x8f,0x8f,15,15,0x87,0x87},2)
	local antbar = ants.new{
  progress=-0.5,
  bgcolor=8,
  fgcolor=10,
  trcolor=9,
  speed=1/15,
  w=128,h=2}

 return view.of{
  bg.new{c=15},
  view.new{
	  views=printz"⁶j30⁵ii⁶w⁶tᶜ9a  e\n⁶j00⁵ijᶜcp  n  l\n⁶j04³iᶜ2extreme\n⁶j04³i⁶=ᶜeextreme\n⁶j04³hᶜ8extreme\n\0",
   update = function(self)
 	  self.y=20+8*sin(time()/2.1)
	   self.x=32+6*cos(time()/3.7)
   end,
  },
  {update = function()
   local p = antbar.progress + 0.003
   if p > 1.5 then
   	p = -0.5
   	antbar.speed += 1/30
   end
   antbar.progress = p
  end},
  view.new{
   views=antbar,
   y=50,h=2,
  },
 }
end

-->8
-- window manager

-------------------------------
-- view
-------------------------------
-- composits drawable items.
-- add items to .views to
-- composit them. x and y are
-- relative reverse camera
-- offsets. drawable items will
-- observe appropriate incoming
-- camera and clip state.
-- clipping respects existing
-- clipping so stacked views
-- intersect.
-------------------------------
view = {
 x=0,
 y=0,
 w=128,
 h=128,
}
mknew(view, function(x)
 if (not x.views) x.views = {}
end)

function view.of(subviews)
 return view.new{views=subviews}
end

function view:update()
 outer_or_each_opt(self.views, "update")
end

function view:draw()
 local oldcam, oldclip = $0x5f28, $0x5f20
 poke2(0x5f28, %0x5f28-self.x)
 poke2(0x5f2a, %0x5f2a-self.y)
 clip(-%0x5f28, -%0x5f2a, self.w, self.h, true)
 local v = self.views
 outer_or_each_opt(self.views, "draw")
 poke4(0x5f20, oldclip)
 poke4(0x5f28, oldcam)
end

-- draws opaque rectangles.
-- default bg is equivalent to
-- clip-aware cls.
-- restores prior fill palette.
bg = {
 x=0,y=0,w=128,h=128,fp=0,c=0
}
mknew(bg)

function bg:draw()
 local oldfp=fillp(self.fp)
 rectfill(self.x,self.y,self.x+self.w,self.y+self.h,self.c)
 fillp(oldfp)
end

-------------------------------
-- animator
-------------------------------
-- animator is a drawable item
-- that manages a linked list of
-- temporary drawables. a
-- temporary drawable is dropped
-- when its :update returns
-- a non-false value.
-------------------------------
animator = {}
mknew(animator)

function animator:update()
 local p,n=self, self.next
 while n do
  if n.item:update() then
   local nn = n.next
   if (not nn) self.tail = p
   p.next = n.next
  else
   p = n
  end
  n = p.next
 end
end

function animator:draw()
 local n = self.next
 while n do
  n.item:draw()
  n = n.next
 end
end

-- add a new drawable under all
-- existing other items.
-- (it draws first)
function animator:push_under(i)
 self.next={next=self.next, item=i}
end

-- add a new drawable over all
-- existing other items.
-- (it draws last)
function animator:push_over(i)
 local target, node = self.tail or self, {item=i}
 target.next=node
 self.tail=node
end


-->8
-- panel drawing

-- panel in ordinary state
panel = {
 -- plt: palette as table
 -- sx, sy: ulc of emblem on
 --         sprite sheet
 -- ey: y offset for emblem;
 --     usually 2, can wiggle
 -- as: animation state
 --     0 == plain
 --     negative == mid-fall
 --     positive == bounce
 --                 frames left
}
mknew(panel)

jiggle = split"3,3,3,2,2,2,3,3,2,2,1,1,2,2,3,3,2,1"

-- palettes for blocks:
-- lit, bg, shadow, emblem.
-- declared separately to
-- avoid reconstructiong for
-- every panel spawned
redblkp = {9,8,3,7}
ylwblkp = {10,9,4,7}
grnblkp = {6,11,3,7}
blublkp = {7,12,13,7}
prpblkp = {14,13,2,7}

newblock = {
 function()
  return panel.new{
   plt=redblkp,
   sx=83,sy=1,
   ey=2, as=0,
  }
 end,
 function()
  return panel.new{
   plt=ylwblkp,
   sx=83,sy=11,
   ey=2,as=0,
  }
 end,
 function()
  return panel.new{
   plt=grnblkp,
   sx=78,sy=11,
   ey=2,as=0,
  }
 end,
 function()
  return panel.new{
   plt=blublkp,
   sx=83,sy=6,
   ey=2,as=0,
  }
 end,
 function()
  return panel.new{
   plt=prpblkp,
   sx=73,sy=11,
   ey=2,as=0,
  }
 end,
}

function panel:update()
 local dat_as = self.as
 if (dat_as < 0) self.ey = 1
 if (dat_as == 0) self.ey = 2
 if dat_as > 0 then
  self.ey = jiggle[dat_as]
  self.as -= 1
 end
end

function panel:draw()
 pal(self.plt)
 sspr(72,0,9,9)
 sspr(self.sx,self.sy,
  5,5,
  2,self.ey) 
end
-->8
-- general drawing
function printz(str)
	return {draw=function()
	 print(str, 0, 0)
	end}
end

-- horizontal marching ants
ants = {
 w=60, h=1,
 stride=10,
 
 -- bgcolor=0,  --nil: transparent
 ldcolor=7,
 fgcolor=6,
 trcolor=5,
 
 speed=2/60,
 offset=0,
 
 progress=0.0,
}
mknew(ants)

function ants:update()
 local stride = self.stride
	local off = self.offset + self.speed * stride
	if (off > stride) off -= stride
	self.offset = off
end

function ants:draw()
 local w,h,s,p,bg=self.w, self.h, self.stride,self.progress,self.bgcolor
	if (bg) rectfill(0,0,w,h,bg)
	if (p<=0) return
	local x0 = (self.offset-s)&-1
	local bw = (p*s)&-1
	if bw > 1 then
	 local bwm2,c = bw-2,self.fgcolor
	 for x=x0,w,s do
		 rectfill(x,0,x+bwm2,h,c)
	 end
	end
	if bw > 0 then
		local c = self.ldcolor
		for x=x0+bw-1,w,s do
			rectfill(x,0,x,h,c)
		end
	end
	if p < 1 then
		local c = self.trcolor
		for x = x0-1+s,w,s do
			rectfill(x,0,x,h,c)
		end
	end
end
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