References ▼
#include "LtPnt.h"
L_LTPNT_API L_INT L_PntRegionEllipse(pPaint, UserDC, prcRect, phDestRgn)
Creates an elliptical region using the bounding rectangle, specified in prcRect.
Pointer to a paint handle.
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.
Pointer to a RECT structure that specifies the region boundaries.
Pointer to the region handle to be updated with the resulting region.
| Value | Meaning |
|---|---|
| SUCCESS | The function was successful. |
| < 1 | An error occurred. Refer to Return Codes. |
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
L_INT PntRegionEllipseExample(HWND hWnd,pBITMAPHANDLE pBitmap,L_INT *g_nZoomFactor ,L_INT *g_nHScroll,L_INT *g_nVScroll ){L_INT nRet;pPAINTHANDLE pPaint ;HDC hDC ;RECT rcView ;PAINTXFORM PntXForm ;L_INT nXOffset, nYOffset ;HRGN hRgn ;RECT rcRegionRect ;/* 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 3:1 */nRet = L_PntSetTransformation ( pPaint, &PntXForm ) ;if(nRet != SUCCESS)return nRet;/* set the painting rectangel */SetRect ( &rcView, 0, 0, BITMAPWIDTH ( pBitmap ), BITMAPHEIGHT ( pBitmap ) ) ;if ( *g_nZoomFactor < 100 ){nXOffset = - MulDiv ( *g_nHScroll, 100, *g_nZoomFactor ) ;nYOffset = - MulDiv ( *g_nVScroll, 100, *g_nZoomFactor ) ;}else{nXOffset = - *g_nHScroll ;nYOffset = - *g_nVScroll ;}OffsetRect ( &rcView, nXOffset, nYOffset ) ;rcView.left = MulDiv ( rcView.left, *g_nZoomFactor, 100 ) ;rcView.top = MulDiv ( rcView.top, *g_nZoomFactor, 100 ) ;rcView.right = MulDiv ( rcView.right, *g_nZoomFactor, 100 ) ;rcView.bottom = MulDiv ( rcView.bottom, *g_nZoomFactor, 100 ) ;/* Get the device context */hDC = GetDC ( hWnd ) ;/* paint the bitmap */nRet = L_PaintDC( hDC, pBitmap, NULL, NULL, &rcView, NULL, SRCCOPY ) ;if(nRet != SUCCESS)return nRet;/* Set the rectangle coordinates with respect to the DC dimensions*//* Set the rectangle coordinates with respect to the DC dimensions*/SetRect ( &rcRegionRect, 10, 10, 110, 110 ) ;/* Use the current region properties and the current painting *//* transformations to create an ellipse region */nRet = L_PntRegionEllipse ( pPaint, hDC, &rcRegionRect, &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 ;}