自定义浏览DWG控件的实现方法

// fcGsPreviewCtrl.cpp : 实现文件 // #include "StdAfx.h" #include "resource.h" #include "fcGsPreviewCtrl.h" #include "dbents.h" #include "dbapserv.h" #include "dbxentrypoint.h" #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif #define RXASSERT ASSERT IMPLEMENT_DYNAMIC(fcGsPreviewCtrl, CStatic) fcGsPreviewCtrl::fcGsPreviewCtrl() { m_hPanCursor = NULL; // 移动时的图标 m_hCrossCursor = NULL; // 十字图标 m_hOrbitCursor = NULL; // 旋转图标 m_pView = NULL; // 图形系统中的视图，用来绘制图形的区域 m_pDevice = NULL; // 图形系统中的设备， m_pModel = NULL; m_bPanning = false; // 是否处于移动图形状态 m_bOrbiting = false; // 是否处于旋转图形状态 m_pDb = NULL; // 该预览空间绑定的数据库 } fcGsPreviewCtrl::~fcGsPreviewCtrl() { Clear(); } BEGIN_MESSAGE_MAP(fcGsPreviewCtrl, CStatic) //{{AFX_MSG_MAP(fcGsPreviewCtrl) ON_WM_PAINT() ON_WM_SIZE() ON_WM_MOUSEWHEEL() ON_WM_LBUTTONDOWN() ON_WM_MBUTTONDOWN() ON_WM_MBUTTONUP() ON_WM_MOUSEMOVE() ON_WM_NCHITTEST() ON_WM_SETFOCUS() ON_WM_LBUTTONUP() //}}AFX_MSG_MAP END_MESSAGE_MAP() ///////////////////////////////////////////////////////////////////////////// // fcGsPreviewCtrl message handlers void fcGsPreviewCtrl::OnPaint() { CPaintDC dc(this); //刷新图形系统视图 if (m_pView) { m_pView->invalidate(); m_pView->update(); } } void fcGsPreviewCtrl::OnSize(UINT nType, int cx, int cy) { CRect rect; if (m_pDevice) { GetClientRect(&rect); m_pDevice->onSize(rect.Width(), rect.Height()); } } BOOL fcGsPreviewCtrl::OnMouseWheel(UINT nFlags, short zDelta, CPoint pt) { if (m_pView) { if (zDelta < 0) m_pView->zoom(0.5); else m_pView->zoom(1.5); Invalidate(); } return TRUE; } void fcGsPreviewCtrl::OnLButtonDown(UINT nFlags, CPoint point) { SetFocus(); //设置光标样式 m_bOrbiting = true; SetCapture(); ::SetClassLong(m_hWnd, GCL_HCURSOR, NULL); ::SetCursor(m_hOrbitCursor); m_StartPt = point; } void fcGsPreviewCtrl::OnMButtonDown(UINT nFlags, CPoint point) { //开始移动 m_bPanning = true; SetCapture(); ::SetClassLong(m_hWnd,GCL_HCURSOR,NULL); ::SetCursor(m_hPanCursor); m_StartPt = point; } void fcGsPreviewCtrl::OnMButtonUp(UINT nFlags, CPoint point) { ReleaseCapture(); m_bPanning = false; ::SetClassLong(m_hWnd,GCL_HCURSOR,(long)m_hCrossCursor); } //函数功能:鼠标滚轮放大缩小视图 void fcGsPreviewCtrl::OnMouseMove(UINT nFlags, CPoint point) { if (m_pView) { if (m_bPanning) { //完成从设备坐标系统到世界坐标系统的转换 AcGeVector3d pan_vec(-(point.x-m_StartPt.x),point.y-m_StartPt.y,0); pan_vec.transformBy(m_pView->viewingMatrix() * m_pView->worldToDeviceMatrix().inverse()); m_pView->dolly(pan_vec); Invalidate(); m_StartPt = point; } else if (m_bOrbiting) { const double Half_Pi = 1.570796326795; AcGsDCRect view_rect; m_pView->getViewport (view_rect); int nViewportX = (view_rect.m_max.x - view_rect.m_min.x) + 1; int nViewportY = (view_rect.m_max.y - view_rect.m_min.y) + 1; int centerX = int(nViewportX / 2.0f) + view_rect.m_min.x; int centerY = int(nViewportY / 2.0f) + view_rect.m_min.y; const double radius = min (nViewportX, nViewportY) * 0.4f; // 从最后和新的鼠标位置计算出两个矢量 AcGeVector3d last_vector ((m_StartPt.x - centerX) / radius, -(m_StartPt.y - centerY) / radius, 0.0); if (last_vector.lengthSqrd () > 1.0) // 超出半径范围 last_vector.normalize (); else last_vector.z = sqrt (1.0 - last_vector.x * last_vector.x - last_vector.y * last_vector.y); AcGeVector3d new_vector((point.x - centerX) / radius, -(point.y - centerY) / radius, 0.0); if (new_vector.lengthSqrd () > 1.0) // 超出半径范围 new_vector.normalize (); else new_vector.z = sqrt (1.0 - new_vector.x * new_vector.x - new_vector.y * new_vector.y); // 确定相机操作的角度 AcGeVector3d rotation_vector (last_vector); rotation_vector = rotation_vector.crossProduct (new_vector); // rotation_vector = last_vector x new_vector AcGeVector3d work_vector (rotation_vector); work_vector.z = 0.0f; // rotation_vector到xy平面的投影 double roll_angle = atan2 (work_vector.x, work_vector.y); // 假设相机的向上矢量是朝上的 // 计算向上的矢量和工作矢量的夹角 double length = rotation_vector.length (); double orbit_y_angle = (length != 0.0) ? acos (rotation_vector.z / length) + Half_Pi : Half_Pi; // represents inverse cosine of the dot product of the if (length > 1.0f) length = 1.0f; double rotation_angle = asin (length); // view操作 m_pView->roll( roll_angle); m_pView->orbit( 0.0f, orbit_y_angle); m_pView->orbit( rotation_angle, 0.0f); m_pView->orbit( 0.0f, -orbit_y_angle); m_pView->roll(-roll_angle); Invalidate(); m_StartPt = point; } else { ::SetClassLong(m_hWnd,GCL_HCURSOR,(long)m_hCrossCursor); SetFocus(); } } } UINT fcGsPreviewCtrl::OnNcHitTest(CPoint point) { return HTCLIENT; } void fcGsPreviewCtrl::OnSetFocus(CWnd* pOldWnd) { ::SetClassLong(m_hWnd, GCL_HCURSOR, (long)m_hCrossCursor); } void fcGsPreviewCtrl::OnLButtonUp(UINT nFlags, CPoint point) { m_bOrbiting = false; ::SetClassLong(m_hWnd,GCL_HCURSOR,(long)m_hCrossCursor); ReleaseCapture(); } void fcGsPreviewCtrl::Clear() { AcGsManager *pGsManager = acgsGetGsManager(); RXASSERT(pGsManager); if (m_pView) { m_pView->eraseAll(); if (m_pDevice) { bool b = m_pDevice->erase(m_pView); RXASSERT(b); } AcGsClassFactory *pFactory = pGsManager->getGSClassFactory(); RXASSERT(pFactory); pFactory->deleteView(m_pView); m_pView = NULL; } if (m_pModel) { pGsManager->destroyAutoCADModel(m_pModel); m_pModel = NULL; } if (m_pDevice) { pGsManager->destroyAutoCADDevice(m_pDevice); m_pDevice = NULL; } if (m_pDb) { delete m_pDb; m_pDb = NULL; } } //函数功能:传入dwg文件即可预览 BOOL fcGsPreviewCtrl::Init(LPCTSTR szDwgFile) { Clear(); m_pDb = new AcDbDatabase(false,true); Acad::ErrorStatus es = m_pDb->readDwgFile(szDwgFile); if (es != Acad::eOk) { delete m_pDb; m_pDb = NULL; } return InitInner(m_pDb); } //函数功能:传入数据库指针即可预览数据库中的实体 BOOL fcGsPreviewCtrl::Init(AcDbDatabase *pDb) { Clear(); return InitInner(pDb); } //函数功能:获得当前视口的信息。 //输出参数:height 视口高度，width 视口宽度，target 视口中心点，viewDir 视口的观察向量，twist 扭曲的视口 bool fcGsPreviewCtrl::GetActiveViewPortInfo (ads_real &height, ads_real &width, AcGePoint3d &target, AcGeVector3d &viewDir, ads_real &viewTwist, bool getViewCenter) { AcDbDatabase *pDb = acdbHostApplicationServices()->workingDatabase();