旋转的三维方块（计算机图形学）

//3DCube.cpp #include <afxwin.h> #include <math.h> #include "3DCube.h" #define PI 3.1415926 #define INCREMENT PI/30 CMyApp myApp; ///////////////////////////////////////////////////////////////////////// // CMyApp member functions BOOL CMyApp::InitInstance () { m_pMainWnd = new CMainWindow; m_pMainWnd->ShowWindow (m_nCmdShow); m_pMainWnd->UpdateWindow (); return TRUE; } ///////////////////////////////////////////////////////////////////////// // CMainWindow message map and member functions BEGIN_MESSAGE_MAP (CMainWindow, CFrameWnd) ON_WM_CREATE () ON_WM_MOUSEMOVE () ON_WM_MOUSEWHEEL () ON_WM_PAINT () END_MESSAGE_MAP () CMainWindow::CMainWindow () { Create (NULL, _T ("三维立方体"), WS_OVERLAPPEDWINDOW&~WS_SIZEBOX&~WS_MAXIMIZEBOX); } int CMainWindow::OnCreate (LPCREATESTRUCT lpCreateStruct) { if (CFrameWnd::OnCreate (lpCreateStruct) == -1) return -1; // // Initialize datas of the 3D cube. InitPoints (); InitLines (); // // Initialize theta. theta_z = PI/3; theta = PI/5; // // initialize the distance between cube and eyes. nDistance = 500; // // Shift points of the 3D cube to view. ShiftToView (); // // Shift points of the 3D cube to screen. ShiftToScreen (); return 0; } void CMainWindow::OnMouseMove (UINT nFlags, CPoint point) { // static CPoint last_point; if (last_point.x>point.x) { theta += INCREMENT; } else if (last_point.x<point.x) { theta -= INCREMENT; } if (last_point.y>point.y) { theta_z -= INCREMENT; } else if (last_point.y<point.y) { theta_z += INCREMENT; } last_point = point; CRect rect; GetClientRect (&rect); CClientDC dc (this); dc.SetViewportOrg (rect.Width ()/2, rect.Height ()/2); // // Draw new cube. DrawNew (&dc); } BOOL CMainWindow::OnMouseWheel (UINT nFlags, short zDelta, CPoint point) { // int dis = 30; if (zDelta < 0) { dis = -30; } nDistance += dis; if (nDistance < 150) { nDistance = 150; } else if (nDistance > 1000) { nDistance = 1000; } CRect rect; GetClientRect (&rect); CClientDC dc (this); dc.SetViewportOrg (rect.Width ()/2, rect.Height ()/2); // // Draw new cube. DrawNew (&dc); return TRUE; } void CMainWindow::OnPaint () { CRect rect; GetClientRect (&rect); CPaintDC dc (this); dc.SetViewportOrg (rect.Width ()/2, rect.Height ()/2); // // Draw the cube. DrawCube (&dc); } void CMainWindow::InitPoints () { // // initialize the points of 3D cube. n3DPoint[0].SetPoint (-50, -50, -50); n3DPoint[1].SetPoint (-50, 50, -50); n3DPoint[2].SetPoint ( 50, 50, -50); n3DPoint[3].SetPoint ( 50, -50, -50); n3DPoint[4].SetPoint (-50, -50, 50); n3DPoint[5].SetPoint (-50, 50, 50); n3DPoint[6].SetPoint ( 50, 50, 50); n3DPoint[7].SetPoint ( 50, -50, 50); } void CMainWindow::InitLines () { // // initialize the lines of 3D cube. nLine[0][0] = 0;nLine[0][1] = 1; nLine[1][0] = 1;nLine[1][1] = 2; nLine[2][0] = 2;nLine[2][1] = 3; nLine[3][0] = 3;nLine[3][1] = 0; nLine[4][0] = 4;nLine[4][1] = 5; nLine[5][0] = 5;nLine[5][1] = 6; nLine[6][0] = 6;nLine[6][1] = 7; nLine[7][0] = 7;nLine[7][1] = 4; nLine[8][0] = 0;nLine[8][1] = 4; nLine[9][0] = 1;nLine[9][1] = 5; nLine[10][0] = 2;nLine[10][1] = 6; nLine[11][0] = 3;nLine[11][1] = 7; } void CMainWindow::ShiftToView () { int length_x, length_y, length_z; double temp; length_z = (int) (nDistance*cos (theta_z)); temp = nDistance*sin (theta_z); length_x = (int) (temp*cos (theta)); length_y = (int) (temp*sin (theta)); // // Shift points of the 3D cube to view. for (int i=0; i<NUM_POINTS; i++) { n3DPoint[i].ShiftToView (length_x, length_y, length_z); } } void CMainWindow::ShiftToScreen () { // // Shift points of the 3D cube to screen. for (int i=0; i<NUM_POINTS; i++) { n3DPoint[i].ShiftToScreen (400); } } void CMainWindow::CleanCube (CDC *pDC) { pDC->SelectStockObject (WHITE_PEN); // // Draw the lines of the cube. for (int i=0; i<NUM_LINES; i++) { pDC->MoveTo (n3DPoint[nLine[i][0]].GetPoint ()); pDC->LineTo (n3DPoint[nLine[i][1]].GetPoint ()); } pDC->SelectStockObject (BLACK_PEN); } void CMainWindow::DrawCube (CDC *pDC) { // // Draw the lines of the cube. for (int i=0; i<NUM_LINES; i++) { pDC->MoveTo (n3DPoint[nLine[i][0]].GetPoint ()); pDC->LineTo (n3DPoint[nLine[i][1]].GetPoint ()); } } void CMainWindow::DrawNew (CDC *pDC) { // // Clean the last cube CleanCube (pDC); // // Shift points of the 3D cube to view. ShiftToView (); // // Shift points of the 3D cube to screen. ShiftToScreen (); // // Draw the cube. DrawCube (pDC); }