262 lines
8.1 KiB
C++
262 lines
8.1 KiB
C++
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/****************************************************************************
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SKEW.c
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The SKEW module handles rotating a rectangular object.
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****************************************************************************/
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#include "stdafx.h"
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#include "global.h"
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#include "pbrush.h"
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#include "pbrusdoc.h"
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#include "imgwnd.h"
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#include "imgbrush.h"
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#include "imgsuprt.h"
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#include "bmobject.h"
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#include "undo.h"
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#include "props.h"
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#ifdef _DEBUG
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#undef THIS_FILE
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static CHAR BASED_CODE THIS_FILE[] = __FILE__;
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#endif
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#include "memtrace.h"
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static int miAngle;
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/***************************************************************************/
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static int CalcOffset( int iValue )
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{
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// tan[angle] is the 100000/tangent of angles 1 to 89deg.
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static int invtan[90] = { -1, 5728996, 2863625, 1908114, 1430067,
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1143005, 951436, 814436, 711537, 631375,
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567128, 514455, 470463, 433148, 401078,
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373205, 348741, 327085, 307768, 290421,
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274748, 260509, 247509, 235585, 224604,
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214451, 205030, 196261, 188073, 180405,
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173205, 166428, 160034, 153987, 148256,
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142815, 137638, 132705, 127994, 123490,
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119175, 115037, 111061, 107237, 103553,
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100000, 96569, 93252, 90040, 86929,
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83910, 80978, 78129, 75355, 72654,
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70021, 67451, 64941, 62487, 60086,
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57735, 55431, 53171, 50953, 48773,
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46631, 44523, 42448, 40403, 38386,
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36397, 34433, 32492, 30573, 28675,
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26795, 24933, 23087, 21256, 19438,
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17633, 15838, 14054, 12279, 10510,
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8749, 6993, 5241, 3492, 1746 };
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return (((iValue * 1000000 / invtan[miAngle]) + 5) / 10);
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}
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/***************************************************************************/
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void CImgWnd::CmdSkewBrush( int iAngle, BOOL bHorz )
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{
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BOOL bFullImage = FALSE;
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CDC* pdcImg = CDC::FromHandle( m_pImg->hDC );
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CDC* pdcSrc = &theImgBrush.m_dc;
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CRect rectSlct( 0, 0, theImgBrush.m_size.cx, theImgBrush.m_size.cy );
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if (theImgBrush.m_pImg == NULL && ! g_bCustomBrush)
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{
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bFullImage = TRUE;
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pdcSrc = pdcImg;
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rectSlct.SetRect( 0, 0, m_pImg->cxWidth, m_pImg->cyHeight );
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}
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CRect rectSkew = rectSlct;
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if (!iAngle || rectSlct.IsRectEmpty() || abs(iAngle) > 89 || abs(iAngle) < 1 )
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return;
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if (! bFullImage)
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{
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PrepareForBrushChange( TRUE, TRUE );
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HideBrush();
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}
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// angle is the angle of skew 0 to 90 degrees
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// axis is the direction to skew TRUE: horizontal
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// the y axis moves by angle
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// FALSE: verticle
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// the x axis moves by angle
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int iWidthSlct = rectSlct.Width();
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int iHeightSlct = rectSlct.Height();
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miAngle = abs(iAngle);
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if (bHorz) // horizontal - create a new bitmap of size = x + y * tan (angle)
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rectSkew.right += CalcOffset( iHeightSlct );
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else // verticale - create a new bitmap of size = y + x * tan (angle)
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rectSkew.bottom += CalcOffset( iWidthSlct );
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int iWidthSkew = rectSkew.Width();
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int iHeightSkew = rectSkew.Height();
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// angle is the angle of skew 0 to 90 degrees
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// axis is the direction to skew TRUE: horizontal
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// the y axis moves by angle
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// FALSE: verticle
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// the x axis moves by angle
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CDC dcWork;
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CBitmap bmWork;
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CBrush brBackground;
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if (! dcWork.CreateCompatibleDC( pdcImg )
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|| ! bmWork.CreateCompatibleBitmap( pdcImg, iWidthSkew, iHeightSkew )
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|| ! brBackground.CreateSolidBrush( crRight ))
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{
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theApp.SetGdiEmergency( TRUE );
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return;
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}
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CBitmap* pbmOld = dcWork.SelectObject( &bmWork );
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CPalette* ppalOld = SetImgPalette( &dcWork, FALSE );
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dcWork.FillRect( rectSkew, &brBackground );
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CPalette* ppalOldSrc = SetImgPalette( pdcSrc, FALSE );
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// Skew the bitmap
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int mx = 1;
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int my = 1; // local variables for the skew
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int x = rectSlct.left;
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int y = rectSlct.top;
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BeginWaitCursor();
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if (bHorz) // horizontal
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{
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if (iAngle > 0)
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{
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mx = x + CalcOffset( iHeightSlct - y );
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// Start at Bottom
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for (y = rectSlct.bottom; y >= rectSlct.top; )
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{
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dcWork.BitBlt( mx, y, iWidthSlct, 1, pdcSrc, x, y, SRCCOPY );
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mx = x + CalcOffset( iHeightSlct - y-- );
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}
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}
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else
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{
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x = rectSkew.right - iWidthSlct;
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mx = x - CalcOffset( iHeightSlct - y );
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for (y = rectSlct.bottom; y >= rectSlct.top; )
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{
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dcWork.BitBlt( mx, y, iWidthSlct, 1, pdcSrc, rectSlct.left, y, SRCCOPY );
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mx = x - CalcOffset( iHeightSlct - y-- );
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}
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}
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}
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else
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{ // vertical
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if (iAngle > 0)
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{
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my = y + CalcOffset( iWidthSlct - x );
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// Start at left
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for (x = rectSlct.left - 1; x <= rectSlct.right; )
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{
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dcWork.BitBlt( x, my, 1, iHeightSlct, pdcSrc, x, y, SRCCOPY );
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my = y + CalcOffset( iWidthSlct - x++ );
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}
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}
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else
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{
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y = rectSkew.bottom - iHeightSlct;
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my = y - CalcOffset( iWidthSlct - x );
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for (x = rectSlct.left - 1; x <= rectSlct.right; )
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{
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dcWork.BitBlt( x, my, 1, iHeightSlct, pdcSrc, x, rectSlct.top, SRCCOPY );
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my = y - CalcOffset( iWidthSlct - x++ );
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}
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}
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}
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if (ppalOldSrc)
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pdcSrc->SelectPalette( ppalOldSrc, FALSE );
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if (bFullImage)
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{
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theUndo.BeginUndo( TEXT("Skew Bitmap") );
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m_pImg->m_pBitmapObj->SetSizeProp( P_Size, CSize( iWidthSkew, iHeightSkew ) );
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m_pImg->cxWidth = iWidthSkew;
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m_pImg->cyHeight = iHeightSkew;
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SetUndo( m_pImg );
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pdcImg->BitBlt( 0, 0, m_pImg->cxWidth, m_pImg->cyHeight, &dcWork, 0, 0, SRCCOPY );
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InvalImgRect ( m_pImg, &rectSkew );
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CommitImgRect( m_pImg, &rectSkew );
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FinishUndo( rectSkew );
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theUndo.EndUndo();
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DirtyImg( m_pImg );
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InvalidateRect( NULL );
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UpdateWindow();
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dcWork.SelectObject( pbmOld );
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bmWork.DeleteObject();
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}
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else
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{
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CBitmap bmMask;
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if (! bmMask.CreateBitmap( iWidthSkew, iHeightSkew, 1, 1, NULL ))
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{
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if (ppalOld)
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dcWork.SelectPalette( ppalOld, FALSE );
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theApp.SetMemoryEmergency( TRUE );
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return;
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}
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dcWork.SelectObject( pbmOld );
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theImgBrush.m_dc.SelectObject( &bmWork );
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theImgBrush.m_bitmap.DeleteObject();
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theImgBrush.m_bitmap.Attach( bmWork.Detach() );
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theImgBrush.m_size.cx = iWidthSkew;
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theImgBrush.m_size.cy = iHeightSkew;
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VERIFY( theImgBrush.m_maskDC.SelectObject( &bmMask ) ==
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&theImgBrush.m_maskBitmap );
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theImgBrush.m_maskBitmap.DeleteObject();
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theImgBrush.m_maskBitmap.Attach( bmMask.Detach() );
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theImgBrush.RecalcMask( crRight );
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rectSkew = theImgBrush.m_rcSelection;
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mx = 0;
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my = 0;
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if (bHorz)
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mx = CalcOffset( iHeightSlct ) / 2;
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else
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my = CalcOffset( iWidthSlct ) / 2;
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rectSkew.InflateRect( mx, my );
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MoveBrush( rectSkew );
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}
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if (ppalOld)
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dcWork.SelectPalette( ppalOld, FALSE );
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dcWork.DeleteDC();
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EndWaitCursor();
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}
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/***************************************************************************/
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