LRasterPaint::DrawShapePolygon

#include "Ltwrappr.h"

L_INT LRasterPaint::DrawShapePolygon(UserDC, pptPoints, nCount)

Draws a polygon using the specified points.

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 pptPoints

Pointer to an array of POINT structures that specify the vertices of the polygon.

L_INT nCount

Specifies the number of vertices in the array. This value must be greater than 2.

Returns

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

Comments

The polygon is closed automatically by drawing a line from the last vertex to the first.

The polygon will be drawn using the current shape properties. To determine the current shape properties, call LRasterPaint::GetProperty. To set or change the current shape properties, call LRasterPaint::SetProperty. For more information on the shape properties, refer to the PAINTSHAPE structure.

If UserDC is not NULL, the toolkit will paint the polygon on the specified device context. If UserDC is NULL, the polygon will not be painted on a device context.

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

If a bitmap has been set using the LRasterPaint::SetMetrics function, the polygon will be drawn on the specified bitmap. If UserDC is not NULL and a bitmap has been set using the LRasterPaint::SetMetrics function, then the polygon will be drawn to both the device context and the bitmap.

Required DLLs and Libraries

See Also

Functions

Topics

Example

L_INT LRasterPaint_DrawShapePolygonExample( CWnd* pWnd )  
{ 
   L_INT          nRet; 
   LRasterPaint   rstp; 
   CDC*           pDC = pWnd->GetDC( ) ; 
   PAINTSHAPE     shape ;  
   POINT          ptPolyPoints [ 5 ] ; 
   RECT           rcDCExtents ; 
 
   /* 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_BORDERCOLOR  | 
                                PSF_BACKGROUNDCOLOR ; 
   shape.nBorderWidth         = 2 ;  
   shape.crBorderColor        = RGB ( 255, 0, 0 ) ; 
   shape.crBackgroundColor    = RGB ( 255, 255, 192 ) ; 
 
   /* 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*/ 
   ptPolyPoints [ 0 ].x = 10 ; 
   ptPolyPoints [ 0 ].y = 10 ; 
   ptPolyPoints [ 1 ].x = 50 ; 
   ptPolyPoints [ 1 ].y = 15 ; 
   ptPolyPoints [ 2 ].x = 100 ; 
   ptPolyPoints [ 2 ].y = 160 ; 
   ptPolyPoints [ 3 ].x = 100 ; 
   ptPolyPoints [ 3 ].y = 100; 
   ptPolyPoints [ 4 ].x = 20 ; 
   ptPolyPoints [ 4 ].y = 60 ; 
 
    
   /* 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 a polygon to the DC (hDC) */ 
   nRet = rstp.DrawShapePolygon ( pDC->m_hDC, ptPolyPoints, 5 ) ; 
   if(nRet != SUCCESS) 
      return nRet; 
 
   /* Free the paint tools handle */ 
   nRet = rstp.Free ( ) ; 
   if(nRet != SUCCESS) 
      return nRet; 
 
   pWnd->ReleaseDC( pDC ) ; 
 
   return SUCCESS ; 
} 
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