Code for classic Pong clone made with PICO-8

pong-8.p8

pico-8 cartridge // http://www.pico-8.com
version 16
__lua__
-- pong-8
-- https://baraujo42.itch.io

-- globals
player_speed = 1
ball_speed = 0.75

-- game objects
ball = {}
p1 = {}
p2 = {}

function _init()
    p1.x = 1
    p1.w = 3
    p1.h = 15
    p2.x = 124
    p2.w = 3
    p2.h = 15
    reset()
end

-- update with 60 fps
function _update60()
    move_ball()
    move_player(p1, 1)
    move_player(p2, 0)
    detect_ball_collisions()
end

function _draw()
    cls()
    -- ball
    circfill(ball.x,
             ball.y,
             ball.r,
             7)
    -- players
    draw_player(p1)
    draw_player(p2)
    draw_score()
end

function reset()
    reset_ball()
    reset_player(p1)
    reset_player(p2)
end

function reset_player(p)
    p.y = 56
    p.vy = 0
    p.score = 0
end

function reset_ball()
    ball.x = 64
    ball.y = 64
    ball.vx = 0
    ball.vy = 0
    ball.r = 3
    ball_speed = 0.75

    -- initial ball direction
    srand(time())
    ball_dir = flr(rnd(4))
    if(ball_dir == 0) then
        ball.vx = ball_speed
        ball.vy = ball_speed
    elseif (ball_dir == 1) then
        ball.vx = -ball_speed
        ball.vy = ball_speed        
    elseif (ball_dir == 2) then
        ball.vx = ball_speed
        ball.vy = -ball_speed        
    elseif (ball_dir == 3) then
        ball.vx = -ball_speed
        ball.vy = -ball_speed
    end
end

function draw_player(p)
 rectfill(p.x,
          p.y,
          p.x + p.w,
          p.y + p.h,
          7)
end

function draw_score()
    print("baraujo42.itch.io/pong-8", 15, 0)
    print(p1.score, 50, 10)
    print(p2.score, 70, 10)
    print("p1: keys e/d", 0,120)
    print("p2: keys	up/down", 65,120)
end

-- see player keys in https://neko250.github.io/pico8-api/
function move_player(p, i)
    if(btn(2, i)) then
        p.vy = -player_speed
    elseif(btn(3, i)) then
        p.vy = player_speed
    else p.vy = 0
    end

    p.y += p.vy

    if(p.y < 0) then
        p.y = 0
    elseif(p.y + p.h > 128) then
        p.y = 128 - p.h
    end
    
end

function move_ball()
    ball.x += ball.vx
    ball.y += ball.vy    
end

function detect_ball_collisions()
    if(ball.x + ball.r > 128) then
        p1.score += 1
        sfx(1)
        reset_ball()
    elseif(ball.x - ball.r < 0) then
        p2.score += 1
        sfx(2)
        reset_ball()
    elseif(ball.y + ball.r > 128 or
       ball.y - ball.r < 0) then
        ball.vy *= -1
        sfx(0)
    end


 -- p1
 if(ball.y + ball.r> p1.y and
    ball.y - ball.r < p1.y + p1.h and
    ball.x - ball.r < p1.x + p1.w) then
     ball.vx = ball_speed
     if(p1.vy > 0) then ball.vy -= 0.4
     elseif(p1.vy < 0) then ball.vy += 0.4
     end
     sfx(0)
     ball_speed += 0.1
 end

 -- p2
 if(ball.y + ball.r > p2.y and
    ball.y - ball.r < p2.y + p2.h and
    ball.x + ball.r > p2.x) then
     ball.vx = -ball_speed
     if(p2.vy > 0) then ball.vy -= 0.4
     elseif(p2.vy < 0) then ball.vy += 0.4
     end
					sfx(0)
					ball_speed += 0.1
 end

end
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__sfx__
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