L_FrameBitmapRgn

#include "l_bitmap.h"

L_INT EXT_FUNCTION L_FrameBitmapRgn(hDC, pBitmap, pXForm, uType)

HDC hDC;	/* handle to a device context where the image is displayed */
pBITMAPHANDLE pBitmap;	/* pointer to the bitmap handle */
pRGNXFORM pXForm;	/* pointer to a structure for coordinate translation */
L_UINT uType;	/* type of frame to display */

Displays an outline of the bitmap region. If the region includes noncontiguous shapes, each shape is outlined. The outline, itself, is inside the region.

Parameter	Description
hDC	Handle to a device context where the image is displayed and where the frame is to appear.
pBitmap	Pointer to the bitmap handle referencing the bitmap that has the region.
pXForm	Pointer to an RGNXFORM structure that LEADTOOLS uses to translate between display coordinates and bitmap coordinates.
	If you specify NULL in this parameter, the scalar fields default to 1, the offsets default to 0, and the view perspective defaults to the bitmap's view perspective.
uType	The type of frame to display. The following are valid values. To animate the frame, you must cycle through the values using a timer event.
	L_FRAME_MOVING0 [0]
	L_FRAME_MOVING1 [1]
	L_FRAME_MOVING2 [2]
	L_FRAME_MOVING3 [3]
	L_FRAME_MOVING4 [4]
	L_FRAME_MOVING5 [5]
	L_FRAME_MOVING6 [6]
	L_FRAME_MOVING7 [7]

Returns

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

Comments

Before calling this function, you must declare an RGNXFORM structure and set its values, which LEADTOOLS uses to translate between device context coordinates and bitmap coordinates. For details about how the structure works refer to the RGNXFORM structure description. For a description of common usage, refer to Translating Coordinates for a Bitmap Region.

This function is designed to produce an animated frame, which you can implement by calling the function with a timer event that cycles through the possible frame types.

Required DLLs and Libraries

LTDIS

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

Windows 95 / 98 / Me, Windows 2000 / XP.

See Also

Functions:	L_PaintRgnDC, L_PaintRgnDCBuffer, L_PaintRgnDCEffect
Topics:	Raster Image Functions: Displaying Images
	Raster Image Functions: Palettes
	Defining and Using a Bitmap Region
	Handling Palette Changes

Example

For complete sample code, refer to the CHILD.C module of the DEMO example.

/****************************************************************************************
This example, which displays an animated frame around a bitmap region, includes
sections from a program’s message-processing function. The sample code uses the
following global variables: */
BITMAPHANDLE LeadBitmap;   /* Bitmap handle to hold the loaded image. */
L_INT DisplayWidth, DisplayHeight; /* Dimensions of the displayed image */
/****************************************************************************************/
L_INT32 EXT_FUNCTION MainWndProc (HWND hWnd, L_UINT Message, WPARAM wParam,
                                   LPARAM lParam)
{
   HDC hdc; /* Device context used with the palette functions */
   RGNXFORM XFormFromBitmap; /* Structure for transforming bitmap coordinates */
   RECT rClientSize;
   static L_UINT FrameType;

   GetClientRect (hWnd, &rClientSize);
   switch (Message)
   {
   case WM_CREATE:
      /* Load the bitmap and create the region */
      TestFunction(hWnd);
      /* Set the timer for the region frame */
      SetTimer( hWnd, 1, 400, NULL);
   case WM_TIMER:
      /* Do nothing if there is no region */
      if (!L_BitmapHasRgn(&LeadBitmap))
         return(0);
      /* Set the frame type */
      FrameType = (FrameType + 1) % 8;
      /* Get the device context */
      hdc = GetDC (hWnd);
      /* Set XFormFromBitmap fields, assuming that the display rectangle is the same
      as the client area of the current window */
      XFormFromBitmap.uViewPerspective = TOP_LEFT;
      XFormFromBitmap.nXScalarNum = rClientSize.right - rClientSize.left;
      XFormFromBitmap.nXScalarDen = DisplayWidth;
      XFormFromBitmap.nYScalarNum = rClientSize.bottom - rClientSize.top;
      XFormFromBitmap.nYScalarDen = DisplayHeight;
      XFormFromBitmap.nXOffset = 0;
      XFormFromBitmap.nYOffset = 0;
      /* Display the frame */
      L_FrameBitmapRgn(hdc, &LeadBitmap, &XFormFromBitmap, FrameType);

}
return (0);
}