breakout

local w,h = term.getSize()
local running = true

local refreshRate = 0.15
local gtID = os.startTimer(refreshRate)

wall = {
  bricks = { };

  initialize = function(self)
    local wallcolours = {
      [3] = colours.lime;
      [4] = colours.yellow;
      [5] = colours.orange;
      [6] = colours.red;
    }

    for i=3,6 do
      self.bricks[i] = { }
      for x=1,w do
        self.bricks[i][x] = wallcolours[i]
      end
    end
  end;
  update = function(self) end;
  draw = function(self)
    for yval,v in pairs(self.bricks) do
      for xval,color in pairs(v) do
        term.setCursorPos(xval,yval)
        term.setBackgroundColour(color)
        term.write(" ")
      end
    end
  end;
}

ball = {
  xpos = math.floor(w/2);
  ypos = math.floor(h/2);
  xvel = 1;
  yvel = -1;

  update = function(self)
    self.xpos = self.xpos + self.xvel
    self.ypos = self.ypos + self.yvel

    if self.ypos == bat.ypos - 1 and
        self.xpos >= bat.xpos and self.xpos <= bat.xpos + bat.width - 1 then
      self.yvel = self.yvel * -1
    end

    if self.xpos <= 1 and self.xvel == -1 then
      self.xvel = self.xvel * -1
    elseif self.xpos >= w and self.xvel == 1 then
      self.xvel = self.xvel * -1
    end
    if self.ypos <= 1 and self.yvel == -1 then
      self.yvel = self.yvel * -1
    elseif self.ypos >= h and self.yvel == 1 then
      running = false
    end

    --Vertical collisions
    if wall.bricks[self.ypos + self.yvel] and
        wall.bricks[self.ypos + self.yvel][self.xpos] ~= nil then
      for i=-1,1 do
        wall.bricks[self.ypos + self.yvel][self.xpos + i] = nil
      end
      self.yvel = self.yvel * -1
    end

    --Horizontal collisions
    if wall.bricks[self.ypos] and
        wall.bricks[self.ypos][self.xpos + self.xvel] ~= nil then
      for i=-1,1 do
        if wall.bricks[self.ypos + i] then
          wall.bricks[self.ypos + i][self.xpos + self.xvel] = nil
        end
      end
      self.xvel = self.xvel * -1
    end

    --Diagonal collisions
    if wall.bricks[self.ypos + self.yvel] and
        wall.bricks[self.ypos + self.yvel][self.xpos + self.xvel] ~= nil then
      wall.bricks[self.ypos + self.yvel][self.xpos + self.xvel] = nil
      self.xvel = self.xvel * -1
      self.yvel = self.yvel * -1
    end
  end;

  draw = function(self)
    term.setCursorPos(self.xpos, self.ypos)
    term.setBackgroundColour(colours.white)
    term.write(" ")
  end;
}

bat = {
  xpos = math.floor(w/2);
  ypos = h-1;
  width = 5;

  update = function(self, key)
    if key == keys.left and self.xpos > 1 then
      self.xpos = self.xpos-1
    elseif key == keys.right and self.xpos < w - self.width + 1 then
      self.xpos = self.xpos+1
    end
  end;

  draw = function(self)
    term.setCursorPos(self.xpos, self.ypos)
    term.setBackgroundColour(colours.white)
    term.write(string.rep(" ", self.width))
  end
}

function drawGame()
  term.setBackgroundColour(colours.black)
  term.clear()
  wall:draw()
  bat:draw()
  ball:draw()
end

function updateGame()
  local id,p1 = os.pullEvent()

  if id == "key" then
    if p1 == keys.q then running = false end
    bat:update(p1)
  elseif id == "timer" and p1 == gtID then
    ball:update()
    wall:update()
    gtID = os.startTimer(refreshRate)
  end
end

function gameLoop()
  while running do
    drawGame()
    updateGame()
  end
end

wall:initialize()
gameLoop()
term.setBackgroundColour(colours.black)
shell.run("clear")
sleep(0.01)