LAnnPoint::SetTransparent

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#include "ltwrappr.h"

virtual L_INT LAnnPoint::SetTransparent(bTransparent, uFlags=0)

L_BOOL bTransparent;	/* flag that indicates whether to make the bitmap transparent */
L_UINT uFlags;	/* flags that determine which objects to process */

Sets the bitmap associated with the Point object to use a transparent color. A transparent color is not painted when the image is painted.

Parameter	Description
bTransparent	Flag that indicates whether to make the bitmap transparent. Possible values are:
	Value	Meaning
	TRUE	Make the bitmap transparent.
	FALSE	Do not make the bitmap transparent. This is the default.
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 LAnnotation::IsSelected and LAnnotation::SetSelected functions.
	ANNFLAG_NOINVALIDATE	[0x0010] Do not invalidate the affected rectangle in the window. Use this to avoid generating unwanted paint messages.

Returns

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

Comments

Only Point and Stamp objects that are using a bitmap can be set to use a transparent color. By default the transparent color is white (0x00FFFFFF). In order for the transparent bitmaps to be painted properly the LTEFX15u.dll needs to be present for WIN32. If the appropriate DLL is not present, the transparent bitmap stamps will be painted as non-transparent bitmap stamps.

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.

Platforms

Win32, x64.

See Also

Functions:	Class Members
Topics:	Annotation Functions (Document/Medical only) Displaying Annotations
	Displaying and Manipulating Annotation Objects
	Using Color Values in LEADTOOLS

Example

#define MAKE_IMAGE_PATH(pFileName) TEXT("C:\\Users\\Public\\Documents\\LEADTOOLS Images\\")pFileName
L_INT LAnnPoint_SetTransparentExample(HWND hWnd)
{
   LBitmap MyBitmap;
   RECT rect;
   L_TCHAR szTemp[100];
   //Load an image containing color RED
   LBitmapBase BitmapBase;
   BitmapBase.Load(MAKE_IMAGE_PATH(TEXT("ImageProcessingDemo\\FadeMask.bmp")));
   LAnnPoint MyAnnPoint;
   //Make RED transparent
   MyAnnPoint.SetBitmap(&BitmapBase);
   //Make WHITE transparent
   MyAnnPoint.SetTransparentColor(RGB(255,255,255));
   //Get old transparent state
   if (!MyAnnPoint.GetTransparent())
      AfxMessageBox(TEXT("Originally, no transparent color"));
   else
   {
      COLORREF ColorRef;
      MyAnnPoint.GetTransparentColor(&ColorRef);
      wsprintf( szTemp, 
      TEXT("Old Transparent Color: %x"),
      ColorRef);
      AfxMessageBox(szTemp); 
   }
   MyAnnPoint.SetTransparent(TRUE);
   //Display the Point annotation
   ANNPOINT annPoint = {100,100 };
   MyAnnPoint.SetPoints(&annPoint);
   //Verify location of point
   ANNPOINT annPointTemp;
   MyAnnPoint.GetPoints(&annPointTemp);
   wsprintf( szTemp, 
         TEXT("Center of AnnPoint(%d, %d)"),
         (int)annPointTemp.x,
         (int)annPointTemp.y );
   AfxMessageBox(szTemp); 
   MyAnnPoint.SetVisible(TRUE);
   MyAnnPoint.GetBoundingRect(&rect) ;
   //Draw the annotation
   HDC hDC = ::GetDC(hWnd);
   MyAnnPoint.Draw(hDC,&rect);
   ::ReleaseDC(hWnd, hDC); 
   return SUCCESS;
}