ball.lua

require('player')

Ball = {}
setmetatable(Ball, {
    __call = function(self, x, y, color, speed, dir, ascend)
        ball = {
            x = x,
            y = y,
            color = color,
            speed = 5,
            dir = 1,
            ascend = math.random(-8, 8)
        }
        return setmetatable(ball, {__index = Ball})
    end
})

function Ball:spawn()
    self.x = width/2
    self.y = trueHeight/2
    self.color = randColor()
    self.speed = 3
    self.dir = math.random(2)
    self.ascend = math.random(-8, 8)
end

function Ball:checkCollision()
    -- Paddle collision
    local leftCol = (self.x >= width-20 and self.y >= players[2].pos and self.y <= players[2].pos+64)
    local rightCol = (self.x <= 20 and self.y >= players[1].pos and self.y <= players[1].pos+64)
    if leftCol or rightCol then
        self.ascend = math.random(-8, 8)
        self.speed = math.random(6, 11)
        if self.ascend < 0 then
            self.ascend = self.ascend * -1
        end
        self.dir = leftCol and 2 or 1
    end
    -- Screen collision
    if (self.y >= gfx.getHeight()) or (self.y <= 4) then
        self.ascend = self.ascend * -1
    end
end

function Ball:move()
    -- Update ball positions
    self.x = (self.dir == 1) and (self.x + self.speed) or (self.x - self.speed)
    self.y = self.y + self.ascend
    self:checkCollision()
    -- Spawn ball & add score
    local offLeft, offRight = (self.x < 0), (self.x > width)
    if offLeft or offRight then
        players[offLeft and 2 or 1]:updateScore()
        ball:spawn()
        love.timer.sleep(1)
    end
end