LAnnStamp::SetTransparentColor

#include "ltwrappr.h"

virtual L_INT LAnnStamp::SetTransparentColor(crTransparent, uFlags=0)

COLORREF crTransparent;	/* transparent color */
L_UINT uFlags;	/* flags that determine which objects to process */

Sets the transparent color. This function is available in the Document/Medical Toolkits.

Parameter	Description
crTransparent	The fill color. The standard Windows values for COLORREF represent either red, green, and blue color values, or an index into the bitmap's palette. A COLORREF value with the format 0x00BBGGRR represents the blue, green, and red color values for the specified pixel, where 0xBB is the blue value, 0xGG is the green value and 0xRR is the red value. If 0x01000000 is set in the COLORREF value (0x010000ZZ), the lower 8 bits (0xZZ) represent an index into the bitmap's palette, which holds the color value. These COLORREF values can be used with any Windows function and macro that takes a COLORREF parameter.
	In the Document/Medical toolkits, the COLORREF value may represent a 16 bit grayscale value if pBitmap is a 12 or 16-bit grayscale bitmap. So that the value is not confused with an RGB value, the COLORREF_GRAY16 mask (0x04000000) is set. In this case (0x0400YYYY), the lower 16 bits (0xYYYY) of the COLORREF value represent the 16-bit grayscale value. (0x0400FFFF is 16-bit white and 0x04000000is 16-bit black.) This is not a standard Windows value. Therefore, LEADTOOLS functions will recognize a COLORREF having this format, but Windows functions will not. For information on how to use a 16-bit grayscale COLORREF in a non-LEADTOOLS function, refer to LBitmapBase::GetPixelColor.
uFlags	Flags that determine which objects to process. Most of the flags apply only to container objects. You can combine values when appropriate by using a bitwise OR ( \| ). The following are valid values:
	Value	Meaning
	0	Process only the specified object.
	ANNFLAG_SELECTED	[0x0001] Process only objects that have the selected property set to TRUE. For getting and setting the selected property, use the LAnnContainer::GetSelectItems and LAnnotation::SetSelected functions.
	ANNFLAG_NOTTHIS	[0x0004] Process only one level of objects within the specified container, not the container itself. If there are containers within the container, they are modified, but the objects within them are not.
	ANNFLAG_RECURSE	[0x0008] Process objects within a container, and within any subcontainers, down to any level.
	ANNFLAG_NOTCONTAINER	[0x0002] (Used with ANNFLAG_RECURSE) Process objects within containers, not the containers themselves.
	ANNFLAG_NOINVALIDATE	[0x0010] Do not invalidate the affected rectangle in the window. Use this to avoid generating unwanted paint messages.
	ANNFLAG_CHECKMENU	[0x0020] Process objects only if the ANNAUTOTEXT_MENU_TRANSPARENTCOLOR menu item has been selected.

Returns

SUCCESS	The function was successful.
< 1	An error occurred. Refer to Return Codes.

Comments

Only stamp objects that have a bitmap will use the transparent color.

This transparent color is used only if the object is set to transparent using LAnnStamp::SetTransparent.

By default, the transparent color is white (0x00FFFFFF).

All objects created by this automation object will have this transparent color.

In design mode, the transparent color can be picked by selecting the Transparent color from the properties menu. If the objects bitmap has a palette, a dialog box will come up allowing you to select a color from the palette colors. If the objects bitmap does not have a palette, the standard Windows color pick dialog box is used to select a transparent color.

Required DLLs and Libraries

LTANN

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

See Also

Functions:	LAnnStamp::GetTransparentColor, LAnnStamp::SetTransparent
Topics:	Annotation Functions: Object Properties
	Annotation Objects - Default Values
	Annotation Objects - Automated Features
	Displaying and Manipulating Annotation Objects
	Using Color Values in LEADTOOLS

Example

L_INT LAnnStamp_SetTransparentColorExample(HWND hWnd)
{
   LBitmap MyBitmap;
   RECT rect;
   ANNRECT annRect;
   L_TCHAR szTemp[100];
   LSettings::UnlockSupport(L_SUPPORT_DOCUMENT, L_KEY_DOCUMENT);
   //Load an image containing color RED
   LBitmapBase BitmapBase;
   BitmapBase.Load(TEXT("d:\\work\\images\\rgbw.bmp"));
   LAnnStamp MyAnnStamp;
   //Make RED transparent
   MyAnnStamp.SetBitmap(&BitmapBase);
   MyAnnStamp.SetTransparentColor(RGB(255,0,0));
   MyAnnStamp.SetTransparent(TRUE);
   //Verify transparent color
   COLORREF ColorRef;
   MyAnnStamp.GetTransparentColor(&ColorRef);
   wsprintf(szTemp, 
            TEXT("Transparent Color: %x"),
            ColorRef);
   AfxMessageBox(szTemp);
   //Display the stamp annotation
   annRect.left = 50;
   annRect.top = 50;
   annRect.right = 150;
   annRect.bottom = 150;
   MyAnnStamp.SetRect(&annRect);
   MyAnnStamp.SetVisible(TRUE);
   MyAnnStamp.GetBoundingRect(&rect) ;
   //Draw the annotation
   HDC hDC = ::GetDC(hWnd);
   MyAnnStamp.Draw(hDC,&rect);
   ::ReleaseDC(hWnd, hDC);
   return SUCCESS;
}