Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Using FoxTray ActiveX control: System Tray Icon and menu attached to VFP form
Custom GDI+ class
GDI+: Implementing image scrolling with inertia
Obtaining names and positions for shortcuts located on the Windows Desktop
Displaying dimmed window behind VFP top-level form
Enumerating devices installed on the local machine
Printing Image File, programmatically set print page orientation to landscape
Browsing Windows Known Folders (Special Folders)
Moving shortcut to a specified position on the Windows Desktop
Customizing the frame of top-level form: removing the standard frame (VFP9, Vista)
How to control Adobe Reader 9.0 (SDI mode) from VFP application
How to display Windows On-Screen Keyboard
GDI+: creating a gradient
Detecting changes in connections to removable drives (VFP9)
Adding a background image to VFP report (VFP9, ReportListener)
Capturing keyboard activity of another application with the Raw Input API (VFP9)
Displaying icons in the system tray (VFP9)
Starting a dialog box for connecting to network resources and passing input parameters
Disconnecting USB Mass Storage Device programmatically
Reading and setting system access privileges for the current process
Windows Shell Icons displayed and exported to ICO files (Vista)
GDI+: Scrolling through large image using the mouse
Enumerating raw input devices attached to the system (keyboard, mouse, human interface device)
How to load a user profile
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: 24  
    Listed functions:
    GdipCreateMatrix
    GdipDeleteMatrix
    GdipResetWorldTransform
    GdipRotateWorldTransform
    GdipScaleMatrix
    GdipShearMatrix
    GdipTranslateMatrix
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