Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
How to change display settings: screen resolution, screen refresh rate
Capturing keyboard activity of another application with the Raw Input API (VFP9)
Converting Unicode data from the Clipboard to a character string using a given code page
Copying picture of the active form to the Clipboard using Enhanced Metafile API functions
Enumerating raw input devices attached to the system (keyboard, mouse, human interface device)
Enumerating data formats currently available on the clipboard
GDI+: copying to the Clipboard (a) image of active FoxPro window/form, (b) image file
Disabling mouse and keyboard input for the main VFP window (with the app still running)
Custom HttpRequest class (WinINet)
Storing content of the Clipboard to a bitmap file
Current keyboard type
Displaying icons in the system tray (VFP9)
Attaching menu to a top-level form
Using Beep and Sleep functions to make the old tin buzz sing (WinNT only?)
Storing screen shot of a form to bitmap file
Sending email messages with Simple MAPI
Using InternetSetFilePointer when resuming interrupted download from the Internet
How to activate Windows Calculator
Minimizing all running applications
Drawing Windows predefined bitmaps using the LoadBitmap functions
Confining Windows calculator inside the VFP main window
How to print a bitmap file
Retrieving information about the specified icon
Retrieving top-child window for the VFP form
GDI+: Using Scale and Shear transformations

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Before you begin:
The code is based on custom GDI+ class. Download the class module first and save it in gdiplus.prg file.

See also:
  • extending user interface: controls that shake
  • scaling images
  • cropping images
  • rotating images


    A transformation is a process that changes graphics objects from one state to another.

    Rotation, scaling, reflection, translation, and shearing are some examples of transformation.

    Transformations can be applied to graphics shapes, curves, images and to image colors.

  • SET PROCEDURE TO gdiplus ADDITIVE
    
    DO declare
    
    PRIVATE gdiplus As gdiplusinit
    gdiplus = CREATEOBJECT("gdiplusinit")
    
    LOCAL img As gdiimage
    img = CREATEOBJECT("gdiimage", "c:\windows\forest.bmp")
    
    LOCAL matrix1, matrix2, xFactor, yFactor
    xFactor=0.32
    yFactor=0.24
    STORE 0 TO matrix1, matrix2
    
    * create two Matrix objects 
    * and apply scale and shear transformations
    = GdipCreateMatrix(@matrix1)
    = GdipScaleMatrix(matrix1, 1, yFactor, 0)
    = GdipShearMatrix(matrix1, xFactor, 0, 0)
    
    = GdipCreateMatrix(@matrix2)
    = GdipScaleMatrix(matrix2, xFactor, 1, 0)
    = GdipShearMatrix(matrix2, 0, yFactor, 0)
    
    * create a virtual bitmap object and draw the image on it
    * with several transformations applied
    LOCAL memorybitmap As gdibitmap
    memorybitmap = CREATEOBJECT("gdibitmap", 500,500)
    WITH memorybitmap.graphics
        .drawimage(img, 0, 0)
    
        = GdipSetWorldTransform(.graphics, matrix1)
        .drawimage(img, 0, 0)
    
        = GdipSetWorldTransform(.graphics, matrix2)
        .drawimage(img, 0, 0)
    
        = GdipResetWorldTransform(.graphics)
        .drawimage(img, img.imgwidth*xFactor+5, img.imgheight*yFactor+5)
    ENDWITH
    
    = GdipDeleteMatrix(matrix1)
    = GdipDeleteMatrix(matrix2)
    
    * draw the virtual bitmap on FoxPro main window
    WITH CREATEOBJECT("graphics", _screen.HWnd)
        .drawimage(memorybitmap, 100, 100)
    ENDWITH
    * end of main
    
    PROCEDURE declare
        DECLARE INTEGER GdipCreateMatrix IN gdiplus INTEGER @matrix
        DECLARE INTEGER GdipDeleteMatrix IN gdiplus INTEGER matrix
        DECLARE INTEGER GdipResetWorldTransform IN gdiplus INTEGER graphics
    
        DECLARE INTEGER GdipTranslateWorldTransform IN gdiplus;
            INTEGER graphics, SINGLE dx, SINGLE dy, INTEGER ord
    
        DECLARE INTEGER GdipRotateWorldTransform IN gdiplus;
            INTEGER graphics, SINGLE angle, INTEGER ord
    
        DECLARE INTEGER GdipShearMatrix IN gdiplus;
            INTEGER matrix, SINGLE shearX, SINGLE shearY, INTEGER ord
    
        DECLARE INTEGER GdipScaleMatrix IN gdiplus;
            INTEGER matrix, SINGLE scaleX, SINGLE scaleY, INTEGER ord
    
        DECLARE INTEGER GdipTranslateMatrix IN gdiplus;
            INTEGER matrix, SINGLE offsetX, SINGLE offsetY, INTEGER ord
    
        DECLARE INTEGER GdipSetWorldTransform IN gdiplus;
            INTEGER graphics, INTEGER matrix
    
    
    

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    2189 bytes  
    Created: 2005-02-15 20:12:04  
    Modified: 2007-03-19 19:08:13  
    Visits in 7 days: 31  
    Listed functions:
    GdipCreateMatrix
    GdipDeleteMatrix
    GdipResetWorldTransform
    GdipRotateWorldTransform
    GdipScaleMatrix
    GdipShearMatrix
    GdipTranslateMatrix
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