Pong - Purebasic

Pong is my first game written in Purebasic. It features the most basic of AI.

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Pong was compiled using Purebasic v3.94, However, It should be fairly easy to make changes to get it to recompile in the most recent version, or just to convert it into another language.

My old procedural code :D

;*************************************************
; PROJECT   PONG
; AUTHOR    Kenneth Cason
; EMAIL     magus_fireball@yahoo.com
; VERSION   1.0
; DATE      2005 November 25
;*************************************************
InitSprite()
InitSound()
InitKeyboard()

 DataSection     ; ********* a includebinary file bigger .exe but noone can steal stuff :)
   ball:    IncludeBinary "pongball.bmp"
   paddle1: IncludeBinary "pongpaddle_1.bmp"
   paddle2: IncludeBinary "pongpaddle_2.bmp"
   doot:    IncludeBinary "doot.wav"
 EndDataSection

#BALL = 0
#PADDLE1 = 1
#PADDLE2 = 3
#DOOT = 0
#WINDOWSCREEN = 0
#SCREENX = 640
#SCREENY = 480

If OpenWindow(#WINDOWSCREEN,200,200,#SCREENX,#SCREENY,#PB_Window_SystemMenu | #PB_Window_MinimizeGadget| #PB_Window_MaximizeGadget | #PB_Window_TitleBar | #PB_Window_SizeGadget,"PONG")
  OpenWindowedScreen(WindowID(0),0,0,#SCREENX,#SCREENY,1,0,0)

  CatchSprite(#BALL, ?ball)
  CatchSprite(#PADDLE1, ?paddle1)
  CatchSprite(#PADDLE2, ?paddle2)
  CatchSound(#DOOT, ?doot)

  NEWGAME:

    #MOVE = 5
    BALLHEIGHT = SpriteHeight(#BALL)
    PADDLEHEIGHT = SpriteHeight(#PADDLE1)
    score.f  = 0
    eScore.f = 0
    setSpeed.f = 1.1
    speed.f = setSpeed
    compErrPercent = 60
    level = 0
    Gosub SCORE
    Gosub INITPOSITION

  MAIN:

    If window = #WINDOWSCREEN
      Event = WindowEvent()
      If Event    
        Delay(10)
      EndIf
    EndIf

  ; player movement
  ExamineKeyboard()
  If KeyboardPushed(#PB_Key_Up) And p1Y - #MOVE >= 0
    p1Y - #MOVE
  ElseIf KeyboardPushed(#PB_Key_Down) And p1Y + #MOVE < #SCREENY - PADDLEHEIGHT
    p1Y + #MOVE
  ElseIf KeyboardPushed(#PB_Key_Escape)
    End
  EndIf
  ; computer AI
  If Random(100) > compErrPercent
    If p2Y < ballY ; paddle above ball
      If p2Y + #MOVE < #SCREENY - PADDLEHEIGHT
        p2Y + #MOVE
      EndIf
    ElseIf p2Y > ballY ; paddle below ball
      If p2Y - #MOVE >= 0
        p2Y - #MOVE
      EndIf
    EndIf
  EndIf

  ;ball movement
  If speed < 1
    speed = setSpeed
    ballX + ballSpeed * ballDirX
    ballY + ballSpeed * ballDirY
    If ballY <= 0
      ballDirY = 1
    ElseIf ballY >= #SCREENY - BALLHEIGHT
      ballDirY = -1
    EndIf
    If SpriteCollision(#BALL, ballX, ballY, #PADDLE1, p1X, p1Y)
      ballDirX = 1
      PlaySound(#DOOT)
    ElseIf SpriteCollision(#BALL, ballX, ballY, #PADDLE2, p2X, p2Y)
      ballDirX = -1
      PlaySound(#DOOT)
    EndIf
    If ballX <=0
      eScore + 1
      If eScore >= 10
        Gosub GAMEOVER
        Goto NEWGAME
      EndIf
      Gosub SCORE
    ElseIf ballX >= #SCREENX
      score + 1
      If score >= 10
        Gosub LEVELUP
      EndIf
      Gosub SCORE
    EndIf
  Else
    speed - 0.5
  EndIf

  ClearScreen(0,0,0)
  DisplaySprite(#BALL,ballX,ballY)
  DisplaySprite(#PADDLE1,p1X,p1Y)
  DisplaySprite(#PADDLE2,p2X,p2Y)
  StartDrawing(ScreenOutput())
    BackColor(0,0,0)
    FrontColor(255,255,255)
    Locate(#SCREENX/2-10,10)
    DrawText(Str(level))
    Locate(100,10)
    DrawText(Str(score))
    Locate(#SCREENX - 100,10)
    DrawText(Str(eScore))
  StopDrawing()
  FlipBuffers()

  Goto MAIN

  SCORE:

  INITPOSITION:
    ballX = #SCREENX/2
    ballY = #SCREENY/2

    p1X = 5
    p1Y = #SCREENY/2-SpriteHeight(#PADDLE1)  
    p2X = #SCREENX-20
    p2Y = #SCREENY/2-SpriteHeight(#PADDLE2)

    ballSpeed = 5
    ballDirX = Pow(-1, Random(1))
    ballDirY = Pow(-1, Random(1))
  Return

  LEVELUP:
    compErrPercent - 5
    If compErrPercent < 1
      compErrPercent = 1
    EndIf
    score = 0
    eScore = 0
    level + 1
    Gosub SPEEDUP
    Gosub INITPOSITION
  Return

  GAMEOVER:
    switch = 0
    For k = 0 To 60    
      ClearScreen(switch,switch,switch)
      StartDrawing(ScreenOutput())
        BackColor(switch,switch,switch)
        FrontColor(255 - switch,255 - switch,255 - switch)
        Locate(#SCREENX/2-TextLength("GAMEOVER")/2,#SCREENY/2)
        DrawText("GAME OVER")
      StopDrawing()
      FlipBuffers()
      If switch = 0
        switch = 255
      Else
        switch = 0
      EndIf
      Delay(20)
    Next

  Return

  SPEEDUP:
    setSpeed = 1.1 - level/2 * 0.1
    speed = setSpeed
    If setSpeed < 0
      setSpeed = 0
    EndIf
  Return   
Else
  MessageRequester("PONG","Unable To open DirectX 7.0 Or later!",#MB_ICONERROR)
EndIf