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 = 0
  self.dy = 0
end

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

function Ball:reset()
  self.x = VIRTUAL_WIDTH/2 - 2
  self.y = VIRTUAL_HEIGHT/2 - 2

  self.dx = 0
  self.dy = 0
end

function Ball:isCollision(paddle)
  -- collision along a vertical axis (ball hits from right or left)
  if (self.x > paddle.x + paddle.width) or (paddle.x > self.x + self.width) then
    return false
  -- collision along a horizontal axis (ball hits from top or bottom)
  elseif (self.y > paddle.y + paddle.height) or (paddle.y > self.y + self.height) then
    return false
  else
    return true
  end
end


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