part3-ecs.p8

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

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

-- 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
 return p
end

-- creates and returns a new sprite
function newsprite(x,y)
 local s = {}
 s.x = x
 s.y = y
 return s
end

-- creates and returns a new entity
function newentity(position,sprite)
 local e = {}
 e.position = position
 e.sprite = sprite
 add(entities,e)
 return e
end

gs = {}
gs.update = function()
  cls()
  --centre camera on player
  camera(-64+player.position.x+(player.position.w/2),
         -64+player.position.y+(player.position.h/2))
  map()

  -- draw all entities with sprites and positions
  for ent in all(entities) do
   if ent.sprite ~= nil and ent.position ~= nil then
    sspr(player.sprite.x, player.sprite.y,
         player.position.w, player.position.h,
         player.position.x, player.position.y)
   end
  end

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

function _init()
  -- create a player entity
  player = newentity(
   -- create a position component
   newposition(10,10,8,8),
   -- create a sprite component
   newsprite(8,0)
  )
end

function _update()
 --check player movement
 if btn(0) then player.position.x-=1 end
 if btn(1) then player.position.x+=1 end
 if btn(2) then player.position.y-=1 end
 if btn(3) then player.position.y+=1 end
end

function _draw()
 gs.update()
end


__gfx__
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__map__
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