part25-state-system.p8

pico-8 cartridge // http://www.pico-8.com
version 16
__lua__

debug = false

cutscene = {}
cutscene.scene = {}
cutscene.step = 1
cutscene.timer = 0
cutscene.wait = function(t)
  cutscene.timer += 1
  if cutscene.timer > t then
    cutscene.advance()
  end
end
cutscene.advance = function()
  if #cutscene.scene > 0 then
    cutscene.step += 1
    cutscene.timer = 0
  end
end
cutscene.update = function()
  if #cutscene.scene > 0 then
    if cutscene.step > #cutscene.scene then
      -- reset
      cutscene.scene = {}
      cutscene.step = 1
      cutscene.timer = 0
    else
      -- run the next part of the scene
      local f = cutscene.scene[cutscene.step][1]
      local p1 = cutscene.scene[cutscene.step][2]
      local p2 = cutscene.scene[cutscene.step][3]
      local p3 = cutscene.scene[cutscene.step][4]
      f(p1,p2,p3)
    end
  end
end

curtain = {}
curtain.state = 'up'
curtain.height = 0
curtain.speed = 4
curtain.set = function(s)
 curtain.state = s
 cutscene.advance()
end
curtain.draw = function()
  -- top
  rectfill(0,0,128,curtain.height,0)
  --bottom
  rectfill(0,129,128,129-curtain.height,0)
end
curtain.update = function()
 if curtain.state == 'up' then
   if curtain.height > 0 then
     curtain.height -= curtain.speed
   end
 end
 if curtain.state == 'down' then
   if curtain.height <= 64 then
     curtain.height += curtain.speed
   end
 end
end

outside = {}
outside.x = 0
outside.y = 0
outside.w = 22
outside.h = 11
outside.bg = 3

shop = {}
shop.x = 22
shop.y = 0
shop.w = 12
shop.h = 8
shop.bg = 2

currentroom = outside
function setcurrentroom(room)
 currentroom = room
 cutscene.advance()
end
function moveroom(room,entity,x,y)
 cutscene.scene = {
   {curtain.set,'down'},
   {cutscene.wait,20},
   {setcurrentroom,room},
   {entity.position.setposition,x,y},
   {curtain.set,'up'},
   {cutscene.wait,20}
 }
end

-- a table comtaining all game entities
entities = {}

function printoutline(t,x,y,c)
  -- draw the outline
  for xoff=-1,1 do
    for yoff=-1,1 do
      print(t,x+xoff,y+yoff,0)
    end
  end
  --draw the text
  print(t,x,y,c)
end

function ycomparison(a,b)
  if a.position == nil or b.position == nil then return false end
  return a.position.y + a.position.h >
         b.position.y + b.position.h
end

function sort(list, comparison)
  for i = 2,#list do
    local j = i
    while j > 1 and comparison(list[j-1], list[j]) do
      list[j],list[j-1] = list[j-1],list[j]
      j -= 1
    end
  end
end

function canwalk(x,y)
  return not fget(mget(x/8,y/8),7)
end

function touching(x1,y1,w1,h1,x2,y2,w2,h2)
  return x1+w1 > x2 and
  x1 < x2+w2 and
  y1+h1 > y2 and
  y1 < y2+h2
end

function newdialogue()
  local d = {}
  d.text = {nil,nil}
  d.timed = false
  d.timeremaining = 0
  d.cursor = 0
  d.set = function(text,timed)
    -- split text into 2 lines
    if #text > 15 then

      local splitpos = 15
      local spacefound = false

      while splitpos < #text and spacefound == false do
        if sub(text,splitpos,splitpos) == ' ' then
          spacefound = true
        end
        splitpos += 1
      end
      d.text[0] = sub(text,0,splitpos-1)
      d.text[1] = sub(text,splitpos,#text)
    else
      d.text[0] = text
      d.text[1] = nil
    end
    d.timed = timed
    d.cursor = 0
    if timed then d.timeremaining = 100 end
    cutscene.advance()
  end
  return d
end

function newstate(initialstate,r)
  local s = {}
  s.current = initialstate
  s.previous = initialstate
  s.rules = r
  return s
end

function newbounds(xoff,yoff,w,h)
  local b = {}
  b.xoff = xoff
  b.yoff = yoff
  b.w = w
  b.h = h
  return b
end

function newtrigger(xoff,yoff,w,h,f,type)
  local t = {}
  t.xoff = xoff
  t.yoff = yoff
  t.w = w
  t.h = h
  t.f = f
  -- type = 'once', 'always' and 'wait'
  t.type = type
  t.active = false
  return t
end

-- creates and returns a new control component
function newcontrol(left,right,up,down,input)
  local c = {}
  c.left = left
  c.right = right
  c.up = up
  c.down = down
  c.input = input
  return c
end

-- creates and returns a new intention component
function newintention()
  local i = {}
  i.left = false
  i.right = false
  i.up = false
  i.down = false
  i.moving = false
  return i
end

-- creates and returns a new position
function newposition(x,y,w,h)
  local p = {}
  p.x = x
  p.y = y
  p.w = w
  p.h = h
  p.setposition = function(x,y)
    p.x = x
    p.y = y
    cutscene.advance()
  end
  return p
end

-- creates and returns a new sprite
function newsprite(sl)
  local s = {}
  s.spritelist = sl
  s.index = 1
  --s.flip = false
  return s
end

function newanimation(l)
  local a = {}
  a.timer = 0
  a.delay = 3
  a.list = l
  return a
end

-- creates and returns a new entity
function newentity(componenttable)
  local e = {}
  e.position = componenttable.position or nil
  e.sprite = componenttable.sprite or nil
  e.control = componenttable.control or nil
  e.intention = componenttable.intention or nil
  e.bounds = componenttable.bounds or nil
  e.animation = componenttable.animation or nil
  e.trigger = componenttable.trigger or nil
  e.dialogue = componenttable.dialogue or nil
  e.state = componenttable.state or {current='idle'}
  return e
end

function playerinput(ent)

  if #cutscene.scene > 0 then
    ent.intention.left = false
    ent.intention.right = false
    ent.intention.up = false
    ent.intention.down = false
    ent.intention.moving = false
  else
    ent.intention.left = btn(ent.control.left)
    ent.intention.right = btn(ent.control.right)
    ent.intention.up = btn(ent.control.up)
    ent.intention.down = btn(ent.control.down)
    ent.intention.moving = ent.intention.left or ent.intention.right or
                           ent.intention.up or ent.intention.down
  end
end

function npcinput(ent)
  ent.intention.left = true
end

controlsystem = {}
controlsystem.update = function()
  for ent in all(entities) do
    if ent.control ~= nil and ent.intention ~= nil then
      ent.control.input(ent)
    end
  end
end

physicssystem = {}
physicssystem.update = function()
  for ent in all(entities) do
    if ent.position and ent.bounds then

      local newx = ent.position.x
      local newy = ent.position.y

      if ent.intention then
        if ent.intention.left then newx -= 1 end
        if ent.intention.right then newx += 1 end
        if ent.intention.up then newy -= 1 end
        if ent.intention.down then newy += 1 end
      end

      local canmovex = true
      local canmovey = true

      --
      -- map collision
      --

      -- update x position if allowed to move
      if not canwalk(newx+ent.bounds.xoff,ent.position.y+ent.bounds.yoff) or
         not canwalk(newx+ent.bounds.xoff+ent.bounds.w-1,ent.position.y+ent.bounds.yoff+ent.bounds.h-1) or
         not canwalk(newx+ent.bounds.xoff,ent.position.y+ent.bounds.yoff) or
         not canwalk(newx+ent.bounds.xoff+ent.bounds.w-1,ent.position.y+ent.bounds.yoff+ent.bounds.h-1) then
        canmovex = false
      end

      -- update y position if allowed to move
      if not canwalk(ent.position.x+ent.bounds.xoff,newy+ent.bounds.yoff) or
         not canwalk(ent.position.x+ent.bounds.xoff+ent.bounds.w-1,newy+ent.bounds.yoff) or
         not canwalk(ent.position.x+ent.bounds.xoff+ent.bounds.w-1,newy+ent.bounds.yoff+ent.bounds.h-1) or
         not canwalk(ent.position.x+ent.bounds.xoff+ent.bounds.w-1,newy+ent.bounds.yoff+ent.bounds.h-1) then
        canmovey = false
      end

      --
      -- entity collision
      --

      -- check x
      for o in all(entities) do
        if o.position and o.bounds then
          if o ~= ent and
             touching(newx+ent.bounds.xoff,ent.position.y+ent.bounds.yoff,ent.bounds.w,ent.bounds.h,
                      o.position.x+o.bounds.xoff,o.position.y+o.bounds.yoff,o.bounds.w,o.bounds.h) then
            canmovex = false
          end
        end
      end

      -- check y
      for o in all(entities) do
        if o.position and o.bounds then
          if o ~= ent and
             touching(ent.position.x+ent.bounds.xoff,newy+ent.bounds.yoff,ent.bounds.w,ent.bounds.h,
                      o.position.x+o.bounds.xoff,o.position.y+o.bounds.yoff,o.bounds.w,o.bounds.h) then
            canmovey = false
          end
        end
      end

      if canmovex then ent.position.x = newx end
      if canmovey then ent.position.y = newy end

    end
  end
end

animationsystem = {}
animationsystem.update = function()
  for ent in all(entities) do
    if ent.sprite and ent.animation and ent.state then

      if ent.animation.list[ent.state.current] then
       -- increment timer
       ent.animation.timer += 1
       -- if timer is higher than the delay
       if ent.animation.timer > ent.animation.delay then
        -- increment the index and reset the timer
        ent.sprite.index += 1
        if ent.sprite.index > #ent.sprite.spritelist[ent.state.current]['images'] then
         ent.sprite.index = 1
        end
        ent.animation.timer = 0
       end
      end

    end
  end

end

triggersystem = {}
triggersystem.update = function()
  for ent in all(entities) do
    if ent.trigger and ent.position then
      local triggered = false
      for o in all(entities) do
        if ent ~= o and o.bounds and o.position then
          if touching(ent.position.x+ent.trigger.xoff,ent.position.y+ent.trigger.yoff,ent.trigger.w,ent.trigger.h,
                      o.position.x+o.bounds.xoff,o.position.y+o.bounds.yoff,o.bounds.w,o.bounds.h) then
            -- trigger is activated
            triggered = true
            if ent.trigger.type == 'once' then
              ent.trigger.f(ent,o)
              ent.trigger = nil
              break
            end
            if ent.trigger.type == 'always' then
              ent.trigger.f(ent,o)
              ent.trigger.active = true
            end
            if ent.trigger.type == 'wait' then
              if ent.trigger.active == false then
                ent.trigger.f(ent,o)
                ent.trigger.active = true
              end
            end
          end
        end
      end

      if triggered == false then
        ent.trigger.active = false
      end

    end
  end
end

dialoguesystem = {}
dialoguesystem.update = function()
  for ent in all(entities) do
    if ent.dialogue then
      if ent.dialogue.text[0] then

        -- calculate length of text
        local len = #ent.dialogue.text[0]
        if ent.dialogue.text[1] and #ent.dialogue.text[1] > 0 then
          len += #ent.dialogue.text[1]
        end

        if ent.dialogue.cursor < len then
          ent.dialogue.cursor += 1
        end
        if ent.dialogue.timed and
           ent.dialogue.timeremaining > 0 then
          ent.dialogue.timeremaining -= 1
        end
      end
    end
  end
end

statesystem = {}
statesystem.update = function()
 for ent in all(entities) do
  if ent.state and ent.state.rules then

   ent.state.previous = ent.state.current

   for s,r in pairs(ent.state.rules) do
    if r() then ent.state.current = s end
   end

  end
 end
end

gs = {}
gs.update = function()
  cls()
  sort(entities, ycomparison)

  local camerax = -64+player.position.x+(player.position.w/2)
  local cameray = -64+player.position.y+(player.position.h/2)

  --centre camera on player
  camera(camerax,cameray)
  map()

  -- draw all entities with sprites and positions
  for ent in all(entities) do

    -- draw entity
    if ent.sprite and ent.position and ent.state then

     -- reset sprite index if state has changed
     if ent.state.current != ent.state.previous then
      ent.sprite.index = 1
     end

      sspr(ent.sprite.spritelist[ent.state.current]['images'][ent.sprite.index][1],
           ent.sprite.spritelist[ent.state.current]['images'][ent.sprite.index][2],
           ent.position.w, ent.position.h,
           ent.position.x, ent.position.y,
           ent.position.w, ent.position.h,
           ent.sprite.spritelist[ent.state.current]['flip'],false)
    end

    -- draw bounding boxes
    if debug then
      -- bounding boxes
      if ent.position and ent.bounds then
        rect(ent.position.x+ent.bounds.xoff,
             ent.position.y+ent.bounds.yoff,
             ent.position.x+ent.bounds.xoff+ent.bounds.w-1,
             ent.position.y+ent.bounds.yoff+ent.bounds.h-1,9)
      end
      -- trigger boxes
      if ent.position and ent.trigger then
        local colour
        if ent.trigger.active then colour = 11 else colour = 10 end
        rect(ent.position.x+ent.trigger.xoff,
             ent.position.y+ent.trigger.yoff,
             ent.position.x+ent.trigger.xoff+ent.trigger.w-1,
             ent.position.y+ent.trigger.yoff+ent.trigger.h-1,colour)
      end
    end
  end

  camera()
  --crosshair sprite
  --spr(16,64-4,64-4)

  -- draw room border
  -- top border
  rectfill(-1,-1,128,(currentroom.y*8)-cameray-1,currentroom.bg)
  -- left border
  rectfill(-1,-1,(currentroom.x*8)-camerax-1,128,currentroom.bg)
  -- right border
  rectfill((currentroom.x+currentroom.w)*8-camerax,-1,128,128,currentroom.bg)
  -- bottom border
  rectfill(-1,(currentroom.y+currentroom.h)*8-cameray,128,128,currentroom.bg)

  camera(camerax,cameray)

  -- draw dialogue boxes
  for ent in all(entities) do
    if ent.dialogue and ent.position then
      if ent.dialogue.text[0] then
        if (ent.dialogue.timed == false) or
           (ent.dialogue.timed and ent.dialogue.timeremaining > 0) then

          -- move text up if there are 2 lines
          local offset = 0
          if ent.dialogue.text[1] then
            if #ent.dialogue.text[1] > 0 then
              offset -= 8
            end
          end

          -- draw line 1
          local texttodraw = sub(ent.dialogue.text[0],0,ent.dialogue.cursor)
          printoutline(texttodraw,ent.position.x-10,ent.position.y+offset-8,7)

          -- draw line 2
          if ent.dialogue.text[1] then
            texttodraw = sub(ent.dialogue.text[1],0,max(0,ent.dialogue.cursor - #ent.dialogue.text[0]))
            printoutline(texttodraw,ent.position.x-10,ent.position.y+offset,7)
          end

        end
      end
    end
  end

  camera()
  curtain.draw()

end

function _init()

  -- create a player entity
  player = newentity({
    -- create a position component
    position = newposition(10,10,4,8),
    -- create a sprite component
    --sprite = newsprite({{8,0},{12,0},{16,0},{20,0}},1),
    sprite = newsprite({
                         standleft  = { images = {{8,0}}, flip = true },
                         moveleft   = { images = {{8,0},{12,0},{16,0},{20,0}}, flip = true },
                         standright = { images = {{8,0}}, flip = false },
                         moveright  = { images = {{8,0},{12,0},{16,0},{20,0}}, flip = false },
                         standup    = { images = {{24,0}}, flip = true },
                         moveup     = { images = {{24,0},{28,0},{32,0},{36,0}}, flip = true },
                         standdown  = { images = {{24,8}}, flip = false },
                         movedown   = { images = {{24,8},{28,8},{32,8},{36,8}}, flip = false },
                      }),
    -- create a control component
    control = newcontrol(0,1,2,3,playerinput),
    -- create an intention component
    intention = newintention(),
    -- create a new bounding box
    bounds = newbounds(0,6,4,2),
    -- create a new animation component
    animation = newanimation({moveleft=true,moveright=true,moveup=true,movedown=true}),
    -- dialogue component
    dialogue = newdialogue(),
    -- state component
    state = newstate('standright',{ moveup = function() return player.intention.up end,
                                    movedown = function() return player.intention.down end,
                                    moveleft = function() return player.intention.left end,
                                    moveright = function() return player.intention.right end,
                                    standup = function() return not player.intention.up and player.state.current == 'moveup' end,
                                    standdown = function() return not player.intention.down and player.state.current == 'movedown' end,
                                    standleft = function() return not player.intention.left and player.state.current == 'moveleft' end,
                                    standright = function() return not player.intention.right and player.state.current == 'moveright' end
                                  })
  })
  add(entities,player)

  -- create a tree entity
  add(entities,
    newentity({
      -- create a position component
      position = newposition(30,30,16,16),
      -- create a sprite component
      sprite = newsprite({ idle = { images = {{8,8}}, flip = false } }),
      -- create a new bounding box
      bounds = newbounds(6,12,4,4),
      -- trigger component
      trigger = newtrigger(4,10,8,8,
        function(self,other)
          if other == player then
            -- cutscene
            cutscene.scene = {
              {other.dialogue.set,'oh look, a tree. how beautiful!',true},
              {cutscene.wait,100},
              {other.dialogue.set,'some more text!',true},
              {cutscene.wait,100}
            }

          end
        end,'wait')
    })
  )

  -- create a shop entity
  add(entities,
    newentity({
      -- create a position component
      position = newposition(60,40,16,16),
      -- create a sprite component
      sprite = newsprite({ idle = { images = {{40,0}}, flip = false } }),
      -- create a new bounding box
      bounds = newbounds(0,8,16,8),
      -- create a new trigger component
      trigger = newtrigger(10,16,5,3,
        function(self,other)
          if other == player then
            moveroom(shop,other,242,44)
          end
        end,'wait')
    })
  )

  -- create a shop door exit trigger
  add(entities,
    newentity({
      -- create a position component
      position = newposition(240,55,16,3),
      -- create a new trigger component
      trigger = newtrigger(0,0,8,3,
        function(self,other)
          if other == player then
            moveroom(outside,other,70,55)
          end
        end,'wait')
    })
  )

end

function _update()
  --check player input
  controlsystem.update()
  -- move entities
  physicssystem.update()
  -- animate entities
  animationsystem.update()
  -- check triggers
  triggersystem.update()
  -- state system
  statesystem.update()
  -- update dialogue
  dialoguesystem.update()
  -- update cutscene
  cutscene.update()
  -- update curtain
  curtain.update()
end

function _draw()
  gs.update()
end


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