Setting a DigitalPaint Clipping Region

Clipping is used by the toolkit to limit the output to a user-defined region. This can be done using the L_PntSetClipRgn function. To get the last clipping region set, call L_PntGetClipRgn. To offset a clipping region, call L_PntOffsetClipRgn.

L_INT OnPaintShape ( HWND hWnd ) 
{ 
   pPAINTHANDLE pPaint ; 
   HDC hDC ; 
   HRGN hClipRgn ; 
   RECT rcShapeRect ; 
   /* Initiate the Paint toolkit */ 
   if ( SUCCESS != L_PntInit ( &pPaint ) ) 
   { 
      return FAILURE ; 
   } 
   /* Get device context to draw on */ 
   hDC = GetDC ( hWnd ) ; 
   /*Set the rectangle coordinates with respect to the DC dimensions*/ 
   SetRect ( &rcShapeRect, 10, 10, 110, 110 ) ; 
   /*Use the current shape properties to draw an ellipse to DC (hDC) */ 
   L_PntDrawShapeEllipse ( pPaint, hDC, &rcShapeRect ) ; 
   hClipRgn = CreateRectRgn ( 120, 20, 200, 100 ) ; 
   /*Set painting clip region */ 
   L_PntSetClipRgn ( pPaint, hClipRgn ) ; 
   /*Set the rectangle coordinates with respect to the DC dimensions*/ 
   SetRect ( &rcShapeRect, 110, 10, 210, 110 ) ; 
   /*Use the current shape properties to draw an ellipse to DC (hDC) */ 
   L_PntDrawShapeEllipse ( pPaint, hDC, &rcShapeRect ) ; 
   /*Delete the clip region */ 
   DeleteObject ( ( HRGN ) hClipRgn ) ; 
   /*Release the device context */ 
   ReleaseDC ( hWnd, hDC ) ; 
   /* Free the paint tools handle */ 
   L_PntFree ( pPaint ) ; 
   return SUCCESS ; 
} 

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