ball.lua

ball = Class{}

function ball:init(x, y, width, height)
  self.x = x
  self.y = y
  self.width = width
  self.height = height

  self.dx = math.random(2) == 1 and 100 or -100
  self.dy = math.random(-50, 50)
end

function ball:collides(paddle)
  if self.x > paddle.x + paddle.width or
  self.x + self.width < paddle.x then
    return false
  end

  if self.y > paddle.y + paddle.height or
  self.y + self.height < paddle.y then
    return false
  end

    return true
end

-- Places the ball in the center of the screen with a random x and y velocity to start.

function ball:reset()
  self.x = virtual_width / 2 - self.width / 2
  self.y = virtual_height / 2 - self.height / 2
  self.dx = math.random(2) == 1 and 100 or -100
  self.dy = math.random(-50, 50)
end

function ball:update(dt)
  self.x = self.x + self.dx * dt
  self.y = self.y + self.dy * dt
end

function ball:render()
  love.graphics.rectangle('fill', self.x, self.y, self.width, self.height)
end