Sets the toolkit transformation information.
#include "Ltwrappr.h"
L_INT LRasterPaint::SetTransformation(pXForm)
Pointer to a PAINTXFORM structure that contains transform values used to transform input coordinates. If this parameter is NULL, the zoom will default to 100 and the offset values will default to 0.
Value | Meaning |
---|---|
SUCCESS | The function was successful. |
< 1 | An error occurred. Refer to Return Codes |
The toolkit will transform all input and output coordinates, using the values set by this function, unless otherwise stated.
L_INT LRasterPaint_SetTransformationExample( CWnd* pWnd, LBitmap* pBitmap, L_INT m_nZoomFactor, L_INT m_nHscroll, L_INT m_nVscroll)
{
//data member L_INT m_nZoomFactor = 500 ;
//data member L_INT m_nHscroll = 0 ;
//data member L_INT m_nVscroll = 0 ;
L_INT nRet;
LRasterPaint rstp ;
CDC* pDC = pWnd->GetDC() ;
RECT rcView ;
L_INT nXOffset, nYOffset ;
RECT rcShapeRect ;
PAINTXFORM PntXForm ;
RECT rcDCExtents ;
/* Initiate the Paint toolkit */
nRet = rstp.Initialize ();
if(nRet != SUCCESS)
return nRet;
/* set the painting rectangel */
SetRect ( &rcView, 0, 0, pBitmap->GetWidth() , pBitmap->GetHeight() ) ;
if ( m_nZoomFactor < 100 )
{
nXOffset = - MulDiv ( m_nHscroll, 100, m_nZoomFactor ) ;
nYOffset = - MulDiv ( m_nVscroll, 100, m_nZoomFactor ) ;
}
else
{
nXOffset = - m_nHscroll ;
nYOffset = - m_nVscroll ;
}
OffsetRect ( &rcView, nXOffset, nYOffset ) ;
rcView.left = MulDiv ( rcView.left, m_nZoomFactor, 100 ) ;
rcView.top = MulDiv ( rcView.top, m_nZoomFactor, 100 ) ;
rcView.right = MulDiv ( rcView.right, m_nZoomFactor, 100 ) ;
rcView.bottom = MulDiv ( rcView.bottom, m_nZoomFactor, 100 ) ;
// set the paintin transformatoins values.
PntXForm.nZoom = m_nZoomFactor ;
PntXForm.nXOffset = - rcView.left ;
PntXForm.nYOffset = - rcView.top ;
/* Set the painting transformations to reflect a zoom-in by 5:1 */
nRet = rstp.SetTransformation ( &PntXForm ) ;
if(nRet != SUCCESS)
return nRet;
/* paint the bitmap */
pBitmap->Paint()->SetDC( pDC->m_hDC );
pBitmap->SetDstRect( &rcView );
pBitmap->Paint()->PaintDC();
/* Set the rectangle coordinates with respect to the DC dimensions*/
SetRect ( &rcShapeRect, 10, 10, 150, 150 ) ;
/* 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 rectangle to DC (hDC) */
nRet = rstp.DrawShapeRectangle ( pDC->m_hDC, &rcShapeRect ) ;
if(nRet != SUCCESS)
return nRet;
/* Release the device context */
pWnd->ReleaseDC( pDC ) ;
/* Free the paint tools handle */
nRet = rstp.Free ( ) ;
if(nRet != SUCCESS)
return nRet;
return SUCCESS ;
}