Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Custom GDI+ class
Storing content of the Clipboard to a bitmap file
Displaying icons in the system tray (VFP9)
GDI+: Implementing image scrolling with inertia
Displaying dimmed window behind VFP top-level form
How to make a VFP form fading out when released (GDI version)
How to print FoxPro form
Obtaining names and positions for shortcuts located on the Windows Desktop
Capturing keyboard activity of another application with the Raw Input API (VFP9)
GDI+: reading and writing metadata in JPEG and TIFF files
How to print a bitmap file
Browsing Windows Known Folders (Special Folders)
Custom HttpRequest class (WinHTTP)
Storing screen shot of a form to bitmap file
Enumerating raw input devices attached to the system (keyboard, mouse, human interface device)
A class that encrypts and decrypts files using Cryptography API Functions
Monitoring clipboard content changes (VFP9)
How to change display settings: screen resolution, screen refresh rate
Testing serial ports
Printing Image File, programmatically set print page orientation to landscape
Using NetWkstaTransportEnum to obtain MAC Address of remote server
Using the LoadImage function to have a bitmap file loaded and displayed on VFP main window
Vertical Label control
Subclassing CommandButton control to create BackColor property
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: 87  
    Listed functions:
    GdipCreateMatrix
    GdipDeleteMatrix
    GdipResetWorldTransform
    GdipRotateWorldTransform
    GdipScaleMatrix
    GdipShearMatrix
    GdipTranslateMatrix
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