Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
GDI+: copying to the Clipboard (a) image of active FoxPro window/form, (b) image file
GDI+: Storing content of the Clipboard to a bitmap file
How to change display settings: screen resolution, screen refresh rate
GDI+: saving image of FoxPro form to graphics file (BMP, GIF, JPG, PNG, TIF)
Using FoxTray ActiveX control: System Tray Icon and menu attached to VFP form
Custom GDI+ class
How to convert a bitmap file to monochrome format (1 bpp)
GDI+: Implementing image scrolling with inertia
Using Video Capture: displaying on FoxPro form frames and previewing video obtained from a digital camera
Capturing keyboard activity of another application with the Raw Input API (VFP9)
Storing content of the Clipboard to a bitmap file
Retrieving the name of the primary domain controller (PDC) and join status information
How to put a horizontal text scrolling on the form (a news line, marquee)
How to display Windows On-Screen Keyboard
Custom HttpRequest class (WinHTTP)
How to detect if additional monitor is connected and active
Winsock: sending email messages (SMTP, port 25)
GDI+: creating scaled copy of image file
Extended MessageBox Class
The SQLGetProp() creates a bridge between Visual FoxPro and the ODBC API
Using EnumPrinters function to enumerate locally installed printers
Custom HttpRequest class (WinINet)
Displaying the associated icons and descriptions for files and folders
Enumerating raw input devices attached to the system (keyboard, mouse, human interface device)
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: 25  
    Listed functions:
    GdipCreateMatrix
    GdipDeleteMatrix
    GdipResetWorldTransform
    GdipRotateWorldTransform
    GdipScaleMatrix
    GdipShearMatrix
    GdipTranslateMatrix
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