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                        DataSection
  Data.f 0.0025,0.0026,0.00235
EndDataSection
Global SCREENWIDTH,SCREENHEIGHT
Define .f:bitplanes.b=32
SCREENWIDTH=GetSystemMetrics_(#SM_CXSCREEN)
SCREENHEIGHT=GetSystemMetrics_(#SM_CYSCREEN)
If InitSprite()=0 Or InitSprite3D()=0 Or InitKeyboard()=0
  MessageRequester("Error","Can't access DirectX",0)
  End
EndIf
desktop.l = CreateImage(0,DesktopWidth(0),DesktopHeight(0))
hdc.l = StartDrawing(ImageOutput(0))
SelectObject_(hdc,desktop)
BitBlt_(hdc,0,0,DesktopWidth(0),DesktopHeight(0),GetDC_(GetDesktopWindow_()),0,0,#SRCCOPY)
StopDrawing()
DeleteDC_(hdc)
While OpenScreen(SCREENWIDTH,SCREENHEIGHT,bitplanes.b,"FullScreen")=0
  If bitplanes.b>16
    bitplanes.b-8
  ElseIf SCREENHEIGHT>600
    SCREENWIDTH=800
    SCREENHEIGHT=600
  ElseIf SCREENHEIGHT>480
    SCREENWIDTH=640
    SCREENHEIGHT=480
  ElseIf SCREENHEIGHT>400
    SCREENWIDTH=640
    SCREENHEIGHT=400
  ElseIf SCREENHEIGHT>240
    SCREENWIDTH=320
    SCREENHEIGHT=240
  ElseIf SCREENHEIGHT>200
    SCREENWIDTH=320
    SCREENHEIGHT=200
  Else
    MessageRequester("Listen:","Can't open Screen!",0)
    End
  EndIf
Wend
w=DesktopWidth(0)
h=DesktopHeight(0)
z=1000/Sqr(3)
perspw=w
PerspectiveAngle.d=#PI/16
CreateSprite(0,w,h,#PB_Sprite_Texture)
StartDrawing(SpriteOutput(0))
DrawImage(ImageID(0),0,0)
StopDrawing()
DisplaySprite(0,0,0)
FlipBuffers()
DisplaySprite(0,0,0)
CreateSprite3D(0,0)
x3=w-1
x4=0
y3=h
y4=h
z3=z
z4=z
For t.b=1 To 3
  omega=-omega
  Read alfa
  Repeat
    ExamineKeyboard()
    ClearScreen(0)
    Incrz=h*Sin(Angle)
    x1=Incrz*Tan(PerspectiveAngle)
    x2=x3-x1
    y1=h-h*Cos(Angle)
    y2=y1
    z1=z+Incrz/4.75
    z2=z1:Start3D()
    TransformSprite3D(0,x1,y1,z1,x2,y2,z2,x3,y3,z3,x4,y4,z4)
    DisplaySprite3D(0,0,0,255)
    Stop3D()
    omega+alfa
    If omega<0
      Angle-Pow(omega,2)
    Else
      Angle+Pow(omega,2)
    EndIf
    If Angle<0 Or Angle>4/5*#PI
      Break
    EndIf
    FlipBuffers()
    Delay(10)
  Until KeyboardPushed(#PB_Key_Escape)
Next
DisplaySprite(0,0,0)
FlipBuffers()
Delay(10)
DisplaySprite(0,0,0)