utils/glcanvas/samples/cube/cube.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        cube.cpp
   3 // Purpose:     wxGLCanvas demo program
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13 #pragma implementation
  14 #pragma interface
  15 #endif
  16
  17 // For compilers that support precompilation, includes "wx.h".
  18 #include "wx/wxprec.h"
  19
  20 #ifdef __BORLANDC__
  21 #pragma hdrstop
  22 #endif
  23
  24 #ifndef WX_PRECOMP
  25 #include "wx/wx.h"
  26 #endif
  27
  28 #include "wx/log.h"
  29
  30 #include "cube.h"
  31
  32 // `Main program' equivalent, creating windows and returning main app frame
  33 bool MyApp::OnInit(void)
  34 {
  35   wxLog::SetTraceMask(wxTraceMessages);
  36
  37   // Create the main frame window
  38   MyFrame *frame = new MyFrame(NULL, "Cube OpenGL Demo", wxPoint(50, 50), wxSize(400, 300));
  39
  40   // Give it an icon
  41 #ifdef wx_msw
  42   frame->SetIcon(wxIcon("mondrian"));
  43 #endif
  44
  45   // Make a menubar
  46   wxMenu *fileMenu = new wxMenu;
  47
  48   fileMenu->Append(wxID_EXIT, "E&xit");
  49   wxMenuBar *menuBar = new wxMenuBar;
  50   menuBar->Append(fileMenu, "&File");
  51   frame->SetMenuBar(menuBar);
  52
  53   frame->m_canvas = new TestGLCanvas(frame, -1, wxPoint(0, 0), wxSize(200, 200));
  54
  55   // Show the frame
  56   frame->Show(TRUE);
  57
  58   return TRUE;
  59 }
  60
  61 IMPLEMENT_APP(MyApp)
  62
  63 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
  64     EVT_MENU(wxID_EXIT, MyFrame::OnExit)
  65 END_EVENT_TABLE()
  66
  67 // My frame constructor
  68 MyFrame::MyFrame(wxFrame *frame, const wxString& title, const wxPoint& pos,
  69     const wxSize& size, long style):
  70   wxFrame(frame, -1, title, pos, size, style)
  71 {
  72     m_canvas = NULL;
  73 }
  74
  75 // Intercept menu commands
  76 void MyFrame::OnExit(wxCommandEvent& event)
  77 {
  78     Destroy();
  79 }
  80
  81 bool MyFrame::OnClose(void)
  82 {
  83     return TRUE;
  84 }
  85
  86 BEGIN_EVENT_TABLE(TestGLCanvas, wxGLCanvas)
  87     EVT_SIZE(TestGLCanvas::OnSize)
  88     EVT_PAINT(TestGLCanvas::OnPaint)
  89     EVT_ERASE_BACKGROUND(TestGLCanvas::OnEraseBackground)
  90 END_EVENT_TABLE()
  91
  92 TestGLCanvas::TestGLCanvas(wxWindow *parent, wxWindowID id,
  93     const wxPoint& pos, const wxSize& size, long style, const wxString& name):
  94   wxGLCanvas(parent, id, pos, size, style, name)
  95 {
  96   m_init = FALSE;
  97 }
  98
  99 TestGLCanvas::~TestGLCanvas(void)
 100 {
 101 }
 102
 103 void TestGLCanvas::OnPaint( wxPaintEvent& event )
 104 {
 105     // This is a dummy, to avoid an endless succession of paint messages.
 106     // OnPaint handlers must always create a wxPaintDC.
 107     wxPaintDC dc(this);
 108
 109     if (!GetContext()) return;
 110
 111     SetCurrent();
 112
 113     /* init OpenGL once, but after SetCurrent */
 114     if (!m_init)
 115     {
 116        InitGL();
 117        m_init = TRUE;
 118     }
 119
 120     /* clear color and depth buffers */
 121     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 122
 123     /* draw six faces of a cube */
 124     glBegin(GL_QUADS);
 125     glNormal3f( 0.0F, 0.0F, 1.0F);
 126     glVertex3f( 0.5F, 0.5F, 0.5F); glVertex3f(-0.5F, 0.5F, 0.5F);
 127     glVertex3f(-0.5F,-0.5F, 0.5F); glVertex3f( 0.5F,-0.5F, 0.5F);
 128
 129     glNormal3f( 0.0F, 0.0F,-1.0F);
 130     glVertex3f(-0.5F,-0.5F,-0.5F); glVertex3f(-0.5F, 0.5F,-0.5F);
 131     glVertex3f( 0.5F, 0.5F,-0.5F); glVertex3f( 0.5F,-0.5F,-0.5F);
 132
 133     glNormal3f( 0.0F, 1.0F, 0.0F);
 134     glVertex3f( 0.5F, 0.5F, 0.5F); glVertex3f( 0.5F, 0.5F,-0.5F);
 135     glVertex3f(-0.5F, 0.5F,-0.5F); glVertex3f(-0.5F, 0.5F, 0.5F);
 136
 137     glNormal3f( 0.0F,-1.0F, 0.0F);
 138     glVertex3f(-0.5F,-0.5F,-0.5F); glVertex3f( 0.5F,-0.5F,-0.5F);
 139     glVertex3f( 0.5F,-0.5F, 0.5F); glVertex3f(-0.5F,-0.5F, 0.5F);
 140
 141     glNormal3f( 1.0F, 0.0F, 0.0F);
 142     glVertex3f( 0.5F, 0.5F, 0.5F); glVertex3f( 0.5F,-0.5F, 0.5F);
 143     glVertex3f( 0.5F,-0.5F,-0.5F); glVertex3f( 0.5F, 0.5F,-0.5F);
 144
 145     glNormal3f(-1.0F, 0.0F, 0.0F);
 146     glVertex3f(-0.5F,-0.5F,-0.5F); glVertex3f(-0.5F,-0.5F, 0.5F);
 147     glVertex3f(-0.5F, 0.5F, 0.5F); glVertex3f(-0.5F, 0.5F,-0.5F);
 148     glEnd();
 149
 150     SwapBuffers();
 151 }
 152
 153 void TestGLCanvas::OnSize(wxSizeEvent& event)
 154 {
 155     int width, height;
 156     GetClientSize(& width, & height);
 157
 158     if (GetContext())
 159     {
 160         SetCurrent();
 161         glViewport(0, 0, width, height);
 162     }
 163 }
 164
 165 void TestGLCanvas::OnEraseBackground(wxEraseEvent& event)
 166 {
 167     // Do nothing, to avoid flashing.
 168 }
 169
 170 void TestGLCanvas::InitGL(void)
 171 {
 172     /* set viewing projection */
 173     glMatrixMode(GL_PROJECTION);
 174     glFrustum(-0.5F, 0.5F, -0.5F, 0.5F, 1.0F, 3.0F);
 175
 176     /* position viewer */
 177     glMatrixMode(GL_MODELVIEW);
 178     glTranslatef(0.0F, 0.0F, -2.0F);
 179
 180     /* position object */
 181     glRotatef(30.0F, 1.0F, 0.0F, 0.0F);
 182     glRotatef(30.0F, 0.0F, 1.0F, 0.0F);
 183
 184     glEnable(GL_DEPTH_TEST);
 185     glEnable(GL_LIGHTING);
 186     glEnable(GL_LIGHT0);
 187 }
 188