Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Placing an arbitrary rectangular area of main VFP window on the Clipboard
Disabling mouse and keyboard input for the main VFP window (with the app still running)
Testing Transparent Menu Class with top-level form (requires VFP9)
Disk in drive A:
Retrieving configuration information for the specified server (Win98/Me)
Obtaining provider name for a specific type of network
Initiating Inet connection using a modem
Testing an ODBC connection for supporting specific functionality
Comparing dimensions of the VFP main window with _SCREEN properties
Current keyboard type
Managing Cookies
Obtaining window class name for the main VFP window
Simple Window Viewer
Using Custom FTP class (DEFINE CLASS ftp As Custom)
Converting long file names to the short format and vice versa
Finding the path to the VFP executable running
Locking mouse and keyboard input for the VFP application
Obtaining the external IP address of local computer
Reading Internet Query options
Sending a standard message with one or more attached files using default email client
Using Video Capture: enumerating installed capture drivers
WAV file recorder
GDI+: Color Transparency
GetFocus returns a HWND value
GDI+: loading image file, drawing on it, saving the result to another file

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Before you begin:
The example shows how to load an image file, put semi-transparent frame with a text on it, and save the result to another file.

Make sure the source and target file names are valid. The source file can be in any of graphics formats supported by the GDI+: BMP, GIF, JPG, TIF, EMF...

The code is based on custom GDI+ class. Download the class module first and save it in gdiplus.prg file.
SET PROCEDURE TO gdiplus ADDITIVE

PRIVATE gdiplus, src, dst, himage
gdiplus = CREATEOBJECT("gdiplusinit")

src = CREATEOBJECT("gdiimage", "c:\windows\forest.bmp")
dst = CREATEOBJECT("gdiimage", src)

IF dst.imgtype=0 OR VARTYPE(dst.graphics) <> "O"
    ? "Error code:", dst.errorcode
    RETURN
ENDIF

LOCAL gdibrush, gdipen, fnt
STORE 0 TO gdibrush, gdipen

* creating brush, pen and font objects
* note that the alpha channel is defined for the solid brush,
* which creates semi-transparent fill
= GdipCreateSolidFill(ARGB(255,255,255, 128), @gdibrush)
= GdipCreatePen1(ARGB(220,220,255), 2, 2, @gdipen)
fnt = CREATEOBJECT("gdifont", "Arial", 24, 1, ARGB(220,220,255))

* drawing filled semi-transparent rectangle with a border
= GdipFillRectangle(dst.graphics.graphics, gdibrush, 5,5, 160,50)
= GdipDrawRectangle(dst.graphics.graphics, gdipen, 5,5, 160,50)

* printing text
= dst.graphics.DrawText("SAMPLE",;
    fnt, 10,10, dst.imgwidth-10, 0)

* releasing system resources
= GdipDeletePen(gdipen)
= GdipDeleteBrush(gdibrush)

* creating drawing surface based on main VFP window
LOCAL gr
gr = CREATEOBJECT("graphics", _screen.HWnd)

gr.DrawImage(src, 20,20)
gr.DrawImage(dst, 20+src.imgwidth+5,20)

*= dst.SaveToFile("d:\temp\tmp.bmp")

* end of main



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1294 bytes  
Created: 2004-07-22 12:43:04  
Modified: 2005-10-13 10:33:55  
Visits in 7 days: 53  
Listed functions:
Printer friendly API declarations
My comment:
The transparency is controlled by the alpha-channel value. In this particular example a semi-transparent solid brush is used.

#kwd: sln_gdiplus.
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