Using Win32 functions in Visual FoxPro Image Gallery
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How to put a vertical text scrolling on the form (a movie cast)

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See also:
  • Scrolling text on the form horizontally (a newsreel)
  • Shaking VFP form controls
  • Playing AVI on _screen
  • Displaying animated images
  • Form Magnifier

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    6659 bytes  
    Created: 2002-12-23 15:25:30  
    Modified: 2011-12-10 09:20:22  
    Visits in 7 days: 352  
    Listed functions:
    BitBlt
    CreateCompatibleBitmap
    CreateCompatibleDC
    CreateSolidBrush
    DeleteDC
    DeleteObject
    FillRect
    GetActiveWindow
    GetDesktopWindow
    GetFocus
    GetWindowDC
    GradientFill
    Polygon
    ReleaseDC
    SelectObject
    SetBkColor
    SetBkMode
    SetTextColor
    TextOut
    Printer friendly API declarations
    My comment:
    This is a simple example of double buffered video output.

    The first buffer, which is the largest one, contains all lines of text printed as a long column.

    The second buffer is of size of the output frame. Triggered by each timer event, the program code:
    - draws a gradient background ( GradientFill )
    - puts some stars ( Polygon )
    - copies a rectangle part with text lines from the first buffer ( BitBlt )

    After this the second buffer is drawn completely, and it is copied to the output frame on the form with the BitBlt function.

    The timing is important for creating a smooth scrolling. Fortunately there are not too many FoxPro commands involved in this cycle, mostly Win32 functions do the job. So the performance is almost the same as it could be for a similar VB code.
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