L_PntRegionPolygon

#include "LtPnt.h"

L_LTPNT_API L_INT L_PntRegionPolygon(pPaint, UserDC, pptPoints, nCount, phDestRgn)

pPAINTHANDLE pPaint;	/* pointer to a paint handle */
L_HDC UserDC;	/* handle to the device context */
const LPPOINT pptPoints;	/* pointer to an array of POINT structures */
L_INT nCount;	/* number of points */
pHRGN phDestRgn;	/* pointer to a region handle */

Creates a polygonal region using the specified points.

Parameter	Description
pPaint	Pointer to a paint handle.
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.
pptPoints	Pointer to an array of POINT structures that specify the vertices of the polygon.
nCount	Specifies the number of vertices in the array. This value must be greater than 2.
phDestRgn	Pointer to the region handle to be updated with the resulting region.

Returns

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 L_PntGetProperty. To set or change the current region properties, call L_PntSetProperty. 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 L_PntGetTransformation. To change or set the painting transformation information, call L_PntSetTransformation.

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

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

See Also

Functions:	L_PntSetProperty, L_PntSetTransformation, L_PntSetDCExtents, L_PntSetMetrics, L_PntDlgRegion, L_PntGetClipRgn, L_PntOffsetClipRgn, L_PntRegionBorder, L_PntRegionColor, L_PntRegionEllipse, L_PntRegionRect, L_PntRegionRoundRect, L_PntRegionScale, L_PntRegionSurface, L_PntRegionTranslate, L_PntSetClipRgn
Topics:	DigitalPaint Functions: Region Processing
	Creating a Region

Example

   L_INT PntRegionPolygonExample(HWND hWnd,
                                                L_INT *g_nZoomFactor,
                                                L_INT *g_nHScroll,
                                                L_INT *g_nVScroll)
                  {
   L_INT nRet;
   pPAINTHANDLE pPaint ;
   HDC          hDC ;
   POINT        ptPolyPoints [ 5 ] ;
   PAINTXFORM   PntXForm ;
   HRGN         hRgn ; 

   /* Initiate the Paint toolkit */
   nRet = L_PntInit ( &pPaint );
   if ( SUCCESS !=  nRet )
   {
      return nRet;
   }

   PntXForm.nZoom    = *g_nZoomFactor ;
   PntXForm.nXOffset = *g_nHScroll ;
   PntXForm.nYOffset = *g_nVScroll ;

   /* Set the painting transformations to relfect a zoom in by 5:1 */
   nRet = L_PntSetTransformation ( pPaint, &PntXForm ) ;
   if(nRet != SUCCESS)
      return nRet;

   /* Get the device context */
   hDC = GetDC ( hWnd ) ;

   /* Set the coordinates with respect to the DC dimensions*/
   ptPolyPoints [ 0 ].x = 10 ;
   ptPolyPoints [ 0 ].y = 10 ;
   ptPolyPoints [ 1 ].x = 50 ;
   ptPolyPoints [ 1 ].y = 15 ;
   ptPolyPoints [ 2 ].x = 70 ;
   ptPolyPoints [ 2 ].y = 60 ;
   ptPolyPoints [ 3 ].x = 120 ;
   ptPolyPoints [ 3 ].y = 100;
   ptPolyPoints [ 4 ].x = 20 ;
   ptPolyPoints [ 4 ].y = 80 ;

   /* Use the current region properties and the current painting */
   /*  trasnformations to create a polygon region */
   nRet = L_PntRegionPolygon ( pPaint, hDC, ptPolyPoints, 5, &hRgn) ;
   if(nRet != SUCCESS)
      return nRet;

   /* Display the resulted region */
   FrameRgn ( hDC, hRgn, ( HBRUSH ) GetStockObject ( BLACK_BRUSH ), 1, 1 ) ;
   
   /* Release the device context */
   ReleaseDC ( hWnd, hDC ) ;

   /*Delete the region */
   DeleteObject ( hRgn ) ;

   /* Free the paint tools handle */
   L_PntFree ( pPaint ) ;

   return SUCCESS ;
}