game.lua

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local function init(std, game)
    game.highscore = game.highscore or 0
    game.player_size = game.height/8
    game.player_pos = game.height/2 - game.player_size/2
    game.ball_pos_x = game.width/2
    game.ball_pos_y = game.height/2
    game.ball_spd_x = 0.3
    game.ball_spd_y = 0.06
    game.ball_size = 8
    game.score = 0
end
 
local function loop(std, game)
    -- inputs
    game.player_dir = std.key.press.down - std.key.press.up
    -- moves
    game.player_pos = std.math.clamp(game.player_pos + (game.player_dir * 7), 0, game.height - game.player_size)
    game.ball_pos_x = game.ball_pos_x + (game.ball_spd_x * game.dt)
    game.ball_pos_y = game.ball_pos_y + (game.ball_spd_y * game.dt)
    -- colisions
    if game.ball_pos_x >= (game.width - game.ball_size) then
        game.ball_spd_x = -std.math.abs(game.ball_spd_x)
    end
    if game.ball_pos_y >= (game.height - game.ball_size) then
        game.ball_spd_y = -std.math.abs(game.ball_spd_y)
    end
    if game.ball_pos_y <= 0 then
        game.ball_spd_y = std.math.abs(game.ball_spd_y)
    end
    if game.ball_pos_x <= 0 then 
        if std.math.clamp(game.ball_pos_y, game.player_pos, game.player_pos + game.player_size) == game.ball_pos_y then
            local new_spd_y = std.math.clamp(game.ball_spd_y + (game.player_pos % 10) - 5, -10, 10)
            game.ball_spd_y = game.ball_spd_y == 0 and new_spd_y == 0 and 20 or new_spd_y -- WOW!
            game.ball_spd_y = game.ball_spd_y / 16
            game.ball_spd_x = std.math.abs(game.ball_spd_x) * 1.003
            game.score = game.score + 1
        else
            std.game.reset()
        end
    end
end
 
local function draw(std, game)
    std.draw.clear(std.color.black)
    std.draw.color(std.color.white)
    std.draw.rect(0, 4, game.player_pos, 8, game.player_size)
    std.draw.rect(0, game.ball_pos_x, game.ball_pos_y, game.ball_size, game.ball_size)
    std.draw.font('Tiresias', 32)
    std.draw.text(game.width/4, 16, game.score)
    std.draw.text(game.width/4 * 3, 16, game.highscore)
end
 
local function exit(std, game)
    game.highscore = std.math.max(game.highscore, game.score)
end
 
local P = {
    meta={
        title='Ping Pong',
        author='RodrigoDornelles',
        description='simple pong',
        version='1.0.0'
    },
    callbacks={
        init=init,
        loop=loop,
        draw=draw,
        exit=exit
    }
}
 
return P;