MFC的CRectTracker类 重新实现及扩展

//=============================== // QTransformTracker.cpp //=============================== // Version 1.03, August 31, 2005: // Resolved MS KB 208856 issue (cursors disappearing under static link) // // Version 1.02, August 14, 2005: // Resolved ambiguous call to atan2, to make it compile with VC++ 7.1 // // Version 1.01, August 30, 2003: // Added check for Windows version at pen creation (PS_ALTERNATE only on Win2000 and later) // // Version 1.0, August 20, 2003: // (c) Sjaak Priester, Amsterdam // www.sjaakpriester.nl #include "StdAfx.h" #include "QTransformTracker.h" #include <math.h> #include <conio.h> /*#define _winmajor 5*/ namespace { const double pi = 4.0 * atan(1.0); // Note: Do _not_ use const REAL pi... etc. // For some reason beyond my comprehension, VC++ 7.1 then makes pi = 0.0000f! enum Handle { HandleTopLeft = 0, HandleTop = 1, HandleTopRight = 2, HandleRight = 3, HandleBottomRight = 4, HandleBottom = 5, HandleBottomLeft = 6, HandleLeft = 7, HandleCenter = 8, HandleBody = 9, HandleNothing = -1 }; } HCURSOR QTransformTracker::g_hCursor[10] = { 0 }; QTransformTracker::QTransformTracker(CWnd * pWnd) : QTracker(pWnd) , m_Options(OptionDefault) , m_Mode(TransformNone) , m_Handle(HandleNothing) , m_bLoaded(false) , m_bSpace(false) , m_bMapFlip(false) , m_bAlt(false) , m_colorMark(RGB(192, 192, 192)) , m_colorHandles(RGB(0, 0, 0)) , m_colorCenter(RGB(0, 0, 0)) , m_colorTrack(RGB(0, 0, 0)) , m_colorPath(RGB(0, 0, 0)) , m_HandleSize(4) , m_InnerMargin(4) , m_OuterMargin(2) , m_FixedSrc(0) , m_FixedDest(0) , m_StartPhi(0.0f) , m_pGraphicsPath(NULL) , m_pPathPoints(NULL) , m_pPathTypes(NULL) , m_IndicatorString(_T("")) { if (g_hCursor[0] == NULL) { // Load static default cursors // Note: if linking to a static MFC-library, // do not define _AFX_NO_TRACKER_RESOURCES in the resource file. // Bug in Visual Studio. See: KB-article 208856 on MSDN. HINSTANCE hInst = ::AfxFindResourceHandle( MAKEINTRESOURCE(AFX_IDC_TRACKNWSE), RT_GROUP_CURSOR); UINT DefaultCursorIDs[] = { AFX_IDC_TRACKNWSE, AFX_IDC_TRACKNESW, AFX_IDC_TRACKNS, AFX_IDC_TRACKWE, AFX_IDC_TRACK4WAY, AFX_IDC_MOVE4WAY, AFX_IDC_MOVE4WAY, AFX_IDC_TRACK4WAY, AFX_IDC_TRACK4WAY, AFX_IDC_TRACK4WAY }; for (int i = 0; i < sizeof(DefaultCursorIDs)/sizeof(UINT); i++) { if (g_hCursor[i] != NULL) continue; // already loaded by user LoadCursor(i, DefaultCursorIDs[i], hInst); ASSERT(g_hCursor[i]); // If you get an assert here, there's probably something wrong // with your resources. } } } QTransformTracker::~QTransformTracker(void) { delete m_pGraphicsPath; delete[] m_pPathPoints; delete[] m_pPathTypes; } int QTransformTracker::OnBeginTrack(UINT nFlags, CPoint point) { m_Transform.Reset(); if (! m_bLoaded) return TrackFailed; m_Handle = HandleTest(point); if (m_Handle == HandleNothing) return TrackFailed; else if (m_Handle == HandleCenter) m_Mode = TransformCenter; else if (m_Handle == HandleBody) m_Mode = TransformMove; else { m_Mode = TransformScale; if (nFlags & MK_CONTROL) { if ((m_Handle & 1) && (m_Options & OptionShear)) m_Mode = TransformShear; if (! (m_Handle & 1) && (m_Options & OptionRotate)) m_Mode = TransformRotate; } m_bAlt = false; if (m_Options & OptionCenter) m_bAlt = ::GetKeyState(VK_MENU) < 0; if (m_Mode == TransformRotate && (m_Options & OptionRotateReverseAlt)) m_bAlt ^= true; SetFixedPoints(m_bAlt); } SetCursor(m_Handle); return TrackContinue; } int QTransformTracker::OnEndTrack(int trackResult) { if (m_Mode == TransformCenter && trackResult == TrackCopy) trackResult = TrackSucceeded; if (trackResult < 0) { m_Transform.Reset(); ::CopyMemory(m_PointDest, m_PointSrc, 5 * sizeof(POINT)); } m_Mode = TransformNone; m_IndicatorString.Empty(); return trackResult; } int QTransformTracker::OnMouseMessage(UINT msg, UINT nFlags, CPoint point) { bool bPrevAlt = m_bAlt; m_bAlt = false; if (m_Options & OptionCenter) m_bAlt = ::GetKeyState(VK_MENU) < 0; if (m_Mode == TransformRotate && (m_Options & OptionRotateReverseAlt)) m_bAlt ^= true; // Alt key changed; change fixed points if (m_bAlt != bPrevAlt) SetFixedPoints(m_bAlt); if (::GetKeyState(VK_SPACE) < 0) { // Space bar pressed, accumulate move in m_Transform CSize sz = point - m_PreviousPoint; m_Transform.Translate((REAL) sz.cx, (REAL) sz.cy, MatrixOrderAppend); SetIndicatorString(TransformMove, (REAL) point.x, (REAL) point.y); m_bSpace = true; return QTracker::OnMouseMessage(msg, nFlags, point); } if (m_bSpace) // Space bar released { SetFixedPoints(m_bAlt); m_bSpace = false; } switch (m_Mode) { case TransformMove: { if (nFlags & MK_SHIFT) point = RestrictPoint(point, m_StartPoint); CSize sz = point - m_StartPoint; m_Transform.Reset(); m_Transform.Translate((REAL) sz.cx, (REAL) sz.cy); SetIndicatorString(TransformMove, (REAL) point.x, (REAL) point.y); } break; case TransformCenter: { if (nFlags & MK_SHIFT) point = RestrictPoint(point, m_StartPoint); m_PointSrc[4] = m_PointDest[4] = point; // Center point is in m_PointSrc[4], no transformation, so Dest == Src SetIndicatorString(TransformCenter, (REAL) point.x, (REAL) point.y); } break; case TransformScale: { CSize sz = point - m_FixedDest; CSize szSrc = m_StartPoint - m_FixedSrc; REAL scaleX = 1.0f; REAL scaleY = 1.0f; if ((m_Handle & 1) == 0) // corner, scale both { if (szSrc.cx != 0) scaleX = (REAL) sz.cx / (REAL) szSrc.cx; if (! (m_Options & OptionAllowMirror) && scaleX < 0.0f) scaleX = 0.0f; if (szSrc.cy != 0) scaleY = (REAL) sz.cy / (REAL) szSrc.cy; if (! (m_Options & OptionAllowMirror) && scaleY < 0.0f) scaleY = 0.0f; if (nFlags & MK_SHIFT) // maintain proportions { REAL scaleXabs = fabsf(scaleX); REAL scaleYabs = fabsf(scaleY); if (scaleXabs > scaleYabs) scaleX = (scaleX < 0) ? - scaleYabs : scaleYabs; else scaleY = (scaleY < 0) ? - scaleXabs : scaleXabs; } // Set cursor; might be changed after flipping int curs = (m_Handle & 2) / 2; // 0 or 1 if (m_bMapFlip) curs ^= 1; curs ^= scaleX < 0; curs ^= scaleY < 0; HCURSOR h = g_hCursor[curs]; if (h) ::SetCursor(h); } else if ((m_Handle & 3) == 1) // horizontal edge, scale vertical { if (szSrc.cy != 0) scaleY = (REAL) sz.cy / (REAL) szSrc.cy; if (! (m_Options & OptionAllowMirror) && scaleY < 0.0f) scaleY = 0.0f; if (nFlags & MK_SHIFT) scaleX = scaleY; } else if ((m_Handle & 3) == 3) // vertical edge, scale horizontal { if (szSrc.cx != 0) scaleX = (REAL) sz.cx / (REAL) szSrc.cx; if (! (m_Options & OptionAllowMirror) && scaleX < 0.0f) scaleX = 0.0f; if (nFlags & MK_SHIFT) scaleY = scaleX; } m_Transform.Reset(); // Translate the fixed point to the origin. m_Transform.Translate((REAL) - m_FixedSrc.x, (REAL) - m_FixedSrc.y, MatrixOrderAppend); // Scale the object. m_Transform.Scale(scaleX, scaleY, MatrixOrderAppend); // Translate back to fixed point (which may be different). m_Transform.Translate((REAL) m_FixedDest.x, (REAL) m_FixedDest.y, MatrixOrderAppend); SetIndicatorString(TransformScale, (REAL) m_StartRect.Width() * scaleX, (REAL) m_StartRect.Height() * scaleY); } break; case TransformRotate: { CSize sz = point - m_FixedDest; REAL phi = 180.0f * atan2((REAL) sz.cy, (REAL) sz.cx) / (REAL) pi - m_StartPhi; while (phi <= -180.0f) phi += 360.0f; // (-180, 180] if (nFlags & MK_SHIFT) { int a = 15 * (int)((phi + 367.5f) / 15.0f); // multiple of 15 degrees while (a > 180) a -= 360; // (-180, 180] phi = (REAL) a; } m_Tran