Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
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GDI+: creating a gradient
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Enumerating devices installed on the local machine
Generating random cryptographic keys
Capturing keyboard activity of another application with the Raw Input API (VFP9)
Disconnecting USB Mass Storage Device programmatically
How to load a user profile
Using Month Calendar Control (VFP9, Comctl32.dll)
Displaying dimmed window behind VFP top-level form
Detecting changes in connections to removable drives (VFP9)
Displaying icons in the system tray (VFP9)
GDI+: custom Clock Control
How to find which fonts Windows uses for drawing captions, menus and message boxes
Customizing the frame of top-level form: removing the standard frame (VFP9, Vista)
Displaying Windows shell folders in TreeView control with Visual FoxPro FLL
Windows Shell Icons displayed and exported to ICO files (Vista)
Winsock: resolving an address to a host name
How to enumerate logon sessions on local computer
Adding a background image to VFP report (VFP9, ReportListener)
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: 21  
    Listed functions:
    GdipCreateMatrix
    GdipDeleteMatrix
    GdipResetWorldTransform
    GdipRotateWorldTransform
    GdipScaleMatrix
    GdipShearMatrix
    GdipTranslateMatrix
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