References ▼
#include "Ltwrappr.h"
L_INT LRasterPaint::SetClipRgn(hClipRgn)
Sets the current clipping region for the toolkit.
A handle to the region to be used to clip the painting output. If this parameter is NULL, there is no clipping region.
| Value | Meaning |
|---|---|
| SUCCESS | The function was successful. |
| < 1 | An error occurred. Refer to Return Codes |
This function creates a copy of the specified region and uses it to clip the painting output. The toolkit will use the region as it is, without doing any transformations.
If a bitmap has been set using the LRasterPaint::SetMetrics function, the toolkit will perform any necessary clipping, draw to the bitmap, and finally draw the resulting bitmap to the specified device context.
Required DLLs and Libraries
L_INT LRasterPaint_SetClipRgnExample( CWnd* pWnd ){L_INT nRet;LRasterPaint rstp;CDC* pDC = pWnd->GetDC() ;HRGN hClipRgn ;RECT rcShapeRect ;RECT rcDCExtents ;/* Initiate the Paint toolkit */nRet = rstp.Initialize ( );if(nRet != SUCCESS)return nRet;/* Set the rectangle coordinates with respect to the DC dimensions*/SetRect ( &rcShapeRect, 10, 10, 110, 110 ) ;/* 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 */nRet = rstp.DrawShapeEllipse ( pDC->m_hDC, &rcShapeRect ) ;if(nRet != SUCCESS)return nRet;hClipRgn = CreateRectRgn ( 120, 20, 200, 100 ) ;/* Set painting clip region */nRet = rstp.SetClipRgn ( hClipRgn ) ;if(nRet != SUCCESS)return nRet;/* 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*/nRet = rstp.DrawShapeEllipse ( pDC->m_hDC, &rcShapeRect ) ;if(nRet != SUCCESS)return nRet;/* Delete the clip region */DeleteObject ( ( HRGN ) hClipRgn ) ;/* Free the paint tools handle */nRet = rstp.Free ( ) ;if(nRet != SUCCESS)return nRet;pWnd->ReleaseDC( pDC ) ;return SUCCESS ;}