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LRasterPaint::RegionSurface

Summary

Creates a region, starting at a specified point and continuing in all directions, that contains a specific color.

Syntax

#include "Ltwrappr.h"

L_INT LRasterPaint::RegionSurface(UserDC, pptPoint, phDestRgn)

Parameters

HDC UserDC

Handle to a device context, such as a screen, to use as a display surface. This parameter can also be NULL. The mapping mode of the device context must be MM_TEXT.

LPPOINT pptPoint

Pointer to a POINT structure that the toolkit will use as a starting point to create the region. The color located at this point will specify the surface color.

pHRGN phDestRgn

Pointer to the region handle to be updated with the resulting region.

Returns

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

Comments

The region creation procedure will be carried out using the current region properties. To determine the current region properties, call LRasterPaint::GetProperty. To set or change the current region properties, call LRasterPaint::SetProperty. For more information on the region properties, refer to the PAINTREGION structure.

This function will also use the current painting transformation information when creating the new region. To get the current painting transformation information, call LRasterPaint::GetTransformation. To change or set the painting transformation information, call LRasterPaint::SetTransformation.

If the user has set a bitmap in the toolkit, using the function LRasterPaint::SetMetrics, then the toolkit will create the region for the bitmap. Otherwise, the toolkit will create the region for the specified device context.

If the UserDC is not NULL, the user should set the DC boundaries before calling this function, by calling LRasterPaint::SetDCExtents.

The images below show the region created by clicking in the red area.

$image\g1.gif$

$image\g2.gif$

Required DLLs and Libraries

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

Example

L_INT LRasterPaint_RegionSurfaceExample( CWnd* pWnd )  
{ 
   L_INT          nRet; 
   LRasterPaint   rstp; 
   CDC*           pDC = pWnd->GetDC( ); 
   PAINTSHAPE     shape ;  
   RECT           rcShape ; 
   RECT           rcDCExtents ; 
   POINT          ptRegionStart ; 
   HRGN           hDestRgn ; 
 
   /* Initiate the Paint toolkit */ 
   nRet = rstp.Initialize ( ); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   /* Get the current shape properties */ 
   nRet = rstp.GetProperty (PAINT_GROUP_SHAPE, &shape ) ; 
   if(nRet != SUCCESS) 
      return nRet; 
 
   /* Set the required shape properties */ 
   shape.nSize             = sizeof ( PAINTSHAPE ) ; 
   shape.dwMask            = PSF_BORDERWIDTH  | 
                             PSF_BORDERSTYLE  | 
                             PSF_BORDERCOLOR  | 
                             PSF_BORDERENDCAP |  
                             PSF_BACKGROUNDCOLOR ; 
   shape.nBorderWidth      = 8 ;  
   shape.nBorderStyle      = PAINT_SHAPE_BORDER_STYLE_DASHDOT ;  
   shape.crBorderColor     = RGB ( 255, 0, 255 ) ; 
   shape.nBorderEndCap     = PAINT_SHAPE_BORDER_ENDCAP_ROUND ; 
   shape.crBackgroundColor = RGB ( 255, 255, 0 ) ; 
 
   /* Set the new shape properties  */ 
   nRet = rstp.SetProperty (PAINT_GROUP_SHAPE, &shape ) ; 
   if(nRet != SUCCESS) 
      return nRet; 
 
   /* Set the coordinates with respect to the DC dimensions*/ 
   SetRect ( &rcShape, 10, 10, 210, 210 ) ; 
 
   /* Get the destination DC dimensions */   
   pWnd->GetClientRect ( &rcDCExtents ) ; 
 
   /* Set the toolkit user DC extents */ 
   nRet = rstp.SetDCExtents (&rcDCExtents ) ; 
   if(nRet != SUCCESS) 
      return nRet; 
 
   /* Use the current shape properties to draw an ellipse to the DC (hDC) */ 
   nRet = rstp.DrawShapeEllipse ( pDC->m_hDC, &rcShape ) ; 
   if(nRet != SUCCESS) 
      return nRet; 
 
   /* Set the fill start point */ 
   ptRegionStart.x = 100 ; 
   ptRegionStart.y = 100 ; 
  
   /* Create the region */ 
   nRet = rstp.RegionSurface ( pDC->m_hDC, &ptRegionStart, &hDestRgn) ;  
   if(nRet != SUCCESS) 
      return nRet; 
 
   /* Display the create region */ 
   FrameRgn ( pDC->m_hDC, hDestRgn, ( HBRUSH ) GetStockObject ( BLACK_BRUSH ), 1, 1 ) ; 
 
   /*Delete the region */ 
   DeleteObject ( hDestRgn ) ; 
 
   /* Free the paint tools handle */ 
   nRet = rstp.Free ( ) ; 
   if(nRet != SUCCESS) 
      return nRet; 
 
   pWnd->ReleaseDC( pDC ) ; 
 
   return SUCCESS ; 
}

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