pico-8 cartridge // http://www.pico-8.com
version 32
__lua__
-- game code

function init_world()
  drops = {}
  frozen_drops = {}
  player = {}
  player.x = 64
  player.y = 16
  player.spr = 1
end

function _init()
  -- button-press initial delay
  poke(0x5f5c, 1)
  -- button-press repeat
  poke(0x5f5d, 2)
  init_world()
end

function _update()
  update_drops()
  update_player()
end

function update_player()
  if btn(0) then
    player.x -= 1
  end
  if btn(1) then
    player.x += 1
  end
  if btn(2) then
    player.y -= 1
  end
  if btn(3) then
    player.y += 1
  end
  if (player.y < 0) player.y = 0
  if (player.y > 127) player.y = 127
  if (player.x < 0) player.x = 0
  if (player.x > 127) player.x = 127

  if (btnp(🅾️)) then
    drop = {}
    drop.x = player.x
    drop.y = player.y
    drop.momentum = 0
    drop.fall_time = 0
    found_drop = false
    for i=1,#drops do
      if (drops[i].x == player.x and drops[i].y == player.y) then
        found_drop = true
        break
      end
    end
    if (not found_drop) then
      add(drops, drop)
    end
  end
end

function update_drops()
  cls()
  draw_drops()
  for i=1,#drops do
    drop = drops[i]
    try_left = rnd() < 0.5
    if drop.momentum == 0 then
      if try_left then
        drop.momentum = -1
      else
        drop.momentum = 1
      end
    end
    if pget(drop.x, drop.y+1) == black then
      drop.y += 1
      drop.momentum = 0
      drop.fall_time = 0
    elseif try_left and drop.x > 0 and
        pget(drop.x-1, drop.y+1) == black then
      drop.x -= 1
      drop.y += 1
      drop.fall_time = 0
    elseif drop.x < 127 and
        pget(drop.x+1, drop.y+1) == black then
      drop.x += 1
      drop.y += 1
      drop.fall_time = 0
    elseif drop.momentum == -1 then
      drop.fall_time += 1
      if drop.x > 0 and pget(drop.x-1, drop.y) == black then
        drop.x -= 1
      else
        drop.momentum = 0
      end
    elseif drop.momentum == 1 then
      drop.fall_time += 1
      if drop.x < 127 and pget(drop.x+1, drop.y) == black then
        drop.x += 1
      else
        drop.momentum = 0
      end
    end
    if drop.y > 127 then drop.y = 127 end
  end
  
  new_drops = {}
  for i=1,#drops do
    drop = drops[i]
    if drop.fall_time > 64 then
      add(frozen_drops, drop)
    else
      add(new_drops, drop)
    end
  end
  drops = new_drops
end

function _draw()
  cls()
  draw_drops()
  draw_player()
  --print("cpu: "..stat(1), 0, 0, light_gray)
  --print("drops: "..#drops, 0, 6, light_gray)
  --print("frozen: "..#frozen_drops, 0, 12, light_gray)
end

function draw_player()
  spr(player.spr,player.x-1,player.y-1)
end

function draw_drops()
  foreach(frozen_drops,draw_drop)
  foreach(drops,draw_drop)
  circfill(94, 94, 3, green)
  circfill(98, 105, 2, orange)
  line(98, 115, 98, 122, pink)
  line(105, 122)
  line(105, 115)

  line(70, 64, 90, 60, dark_purple)
  line(70, 65, 90, 61, dark_purple)
  
  line(60, 30, 80, 50, indigo)
  line(60, 31, 80, 51, indigo)

  line(64, 90, 74, 90)
  line(70, 86)
  line(68, 86, 64, 90)
  
  ovalfill(54, 95, 74, 100, pink)
  
  line(70, 116, 93, 112, green)
  line(70, 115, 93, 111, green)
  line(70, 116, 60, 112, green)
  line(70, 115, 60, 111, green)
    
  print("hello everybody", 63, 58, yellow)
  
end

function draw_drop(drop)
  pset(drop.x, drop.y, blue)
end

-->8
-- library

black = 0
dark_blue = 1
dark_purple = 2
dark_green = 3
brown = 4
dark_gray = 5
light_gray = 6
white = 7
red = 8
orange = 9
yellow = 10
green = 11
blue = 12
indigo = 13
pink = 14
peach = 15

function print_ctr(s,y,c)
  print(s,64 - #s * 2,y,c)
end
__gfx__
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00700700000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000