demos/fractal/fractal.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        fractal.cpp
   3 // Purpose:     demo of wxConfig and related classes
   4 // Author:      Andrew Davison
   5 // Modified by:
   6 // Created:     05.04.94
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1994 Andrew Davison
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12
  13 /*
  14 Date: Tue, 5 Apr 1994 12:01:18 +1000
  15 From: Andrew Davison <andrewd@au.com.sfe>
  16 To: wxwin-users@ed.aiai
  17 Subject: Fractal mountains
  18
  19 Hi,
  20
  21 This is a quick port of a fractal mountain generator originally
  22 done for MS-Windows. On a Sun the colours look a little washed
  23 out and there is not as much snow or high mountains (maybe the
  24 random number generators fault). The viewing plane is not
  25 quite right as the original code used SetViewportOrg() which there
  26 doesn't seem to be an equivalent of under wxWindows, and my quick
  27 hack doesn't fix.
  28 */
  29
  30 #ifdef __GNUG__
  31 #pragma implementation
  32 #pragma interface
  33 #endif
  34
  35 #include "wx/wxprec.h"
  36
  37 #ifndef  WX_PRECOMP
  38   #include "wx/wx.h"
  39 #endif //precompiled headers
  40
  41 #include <stdlib.h>
  42 #include <math.h>
  43 #include <time.h>
  44
  45 #define Random(x) (rand() % x)
  46 #define Randomize() (srand((unsigned int)time(NULL)))
  47
  48 static int detail = 9;          // CHANGE THIS... 7,8,9 etc
  49
  50 static bool running = FALSE;
  51 static wxMenuBar *menuBar = NULL;
  52
  53 // Define a new application type
  54 class MyApp: public wxApp
  55 { public:
  56         bool OnInit();
  57 };
  58
  59 IMPLEMENT_APP(MyApp)
  60
  61 // Define a new frame type
  62 class MyFrame: public wxFrame
  63 {
  64 public:
  65         MyFrame(wxFrame *frame, const wxString& title, const wxPoint& pos, const wxSize& size);
  66
  67         void OnCloseWindow(wxCloseEvent& event);
  68     void OnExit(wxCommandEvent& event);
  69 DECLARE_EVENT_TABLE()
  70 };
  71
  72 // Define a new canvas which can receive some events
  73 class MyCanvas: public wxWindow
  74 {
  75 public:
  76         MyCanvas(wxFrame *frame);
  77         void Draw(wxDC& dc);
  78
  79 private:
  80         void OnPaint(wxPaintEvent& event);
  81         void Fractal(wxDC& dc, int X1, int Y1, int X2, int Y2, int Z1, int Z2, int Z3, int Z4, int Iteration, double Std, double Ratio);
  82         wxPen SnowPen, MtnPen, GreenPen;
  83         wxBrush WaterBrush;
  84         int Sealevel;
  85
  86 DECLARE_EVENT_TABLE()
  87 };
  88
  89 // `Main program' equivalent, creating windows and returning main app frame
  90 bool MyApp::OnInit()
  91 {
  92   // Create the main frame window
  93   MyFrame *frame = new MyFrame(NULL, _T("Fractal Mountains for wxWindows"), wxPoint(-1, -1), wxSize(640, 480));
  94
  95   // Make a menubar
  96   wxMenu *file_menu = new wxMenu;
  97   file_menu->Append(wxID_EXIT, _T("E&xit"));
  98   menuBar = new wxMenuBar;
  99   menuBar->Append(file_menu, _T("&File"));
 100   frame->SetMenuBar(menuBar);
 101
 102   int width, height;
 103   frame->GetClientSize(&width, &height);
 104
 105   (void) new MyCanvas(frame);
 106
 107   // Show the frame
 108   frame->Show(TRUE);
 109
 110   return TRUE;
 111 }
 112
 113 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 114   EVT_CLOSE(MyFrame::OnCloseWindow)
 115   EVT_MENU(wxID_EXIT, MyFrame::OnExit)
 116 END_EVENT_TABLE()
 117
 118 // My frame constructor
 119 MyFrame::MyFrame(wxFrame *frame, const wxString& title, const wxPoint& pos, const wxSize& size):
 120   wxFrame(frame, -1, title, pos, size)
 121 {
 122 }
 123
 124 // Intercept menu commands
 125 void MyFrame::OnExit(wxCommandEvent& WXUNUSED(event))
 126 {
 127     this->Destroy();
 128 }
 129
 130 void MyFrame::OnCloseWindow(wxCloseEvent& WXUNUSED(event))
 131 {
 132     static bool destroyed = FALSE;
 133     if (destroyed)
 134         return;
 135
 136     this->Destroy();
 137
 138     destroyed = TRUE;
 139 }
 140
 141 BEGIN_EVENT_TABLE(MyCanvas, wxWindow)
 142   EVT_PAINT(MyCanvas::OnPaint)
 143 END_EVENT_TABLE()
 144
 145 // Define a constructor for my canvas
 146 MyCanvas::MyCanvas(wxFrame *frame):
 147  wxWindow(frame, -1)
 148 {
 149     wxColour wxCol1(255,255,255);
 150     SnowPen = wxPen(wxCol1, 2, wxSOLID);
 151
 152     wxColour wxCol2(128,0,0);
 153     MtnPen = wxPen(wxCol2, 1, wxSOLID);
 154
 155     wxColour wxCol3(0,128,0);
 156     GreenPen = wxPen(wxCol3, 1, wxSOLID);
 157
 158     wxColour wxCol4(0,0,128);
 159     WaterBrush = wxBrush(wxCol4, wxSOLID);
 160 }
 161
 162 void MyCanvas::OnPaint(wxPaintEvent& WXUNUSED(event))
 163 {
 164     wxPaintDC dc(this);
 165         Draw(dc);
 166 }
 167
 168 void MyCanvas::Draw(wxDC& dc)
 169 {
 170     if (running) return;
 171
 172     running = TRUE;
 173     menuBar->EnableTop(0, FALSE);
 174
 175         Randomize();
 176
 177         int Left, Top, Right, Bottom;
 178         GetClientSize(&Right, &Bottom);
 179
 180         Right *= 3; Right /= 4;
 181         Bottom *= 3; Bottom /= 4;
 182         Left = 0;
 183         Top = Bottom/8;
 184
 185         wxPoint Water[4];
 186         Water[0].x = Left;                          Water[0].y = Top;
 187         Water[1].x = Right;                             Water[1].y = Top;
 188         Water[2].x = Right+Bottom/2;    Water[2].y = Bottom;
 189         Water[3].x = Bottom/2;                  Water[3].y = Bottom;
 190
 191         dc.SetBrush(WaterBrush);
 192         dc.DrawPolygon(4, Water);
 193
 194         double H = 0.75;
 195         double Scale = Bottom;
 196         double Ratio = 1.0 / pow(2.0, H);
 197         double Std = Scale * Ratio;
 198         Sealevel = Random(18) - 8;
 199
 200         Fractal(dc, Left, Top, Right, Bottom, 0, 0, 0, 0, detail, Std, Ratio);
 201
 202     menuBar->EnableTop(0, TRUE);
 203     running = FALSE;
 204 }
 205
 206 void MyCanvas::Fractal(wxDC& dc, int X1, int Y1, int X2, int Y2, int Z1, int Z2, int Z3, int Z4, int Iteration, double Std, double Ratio)
 207 {
 208         int Xmid = (X1 + X2) / 2;
 209         int Ymid = (Y1 + Y2) / 2;
 210         int Z23 = (Z2 + Z3) / 2;
 211         int Z41 = (Z4 + Z1) / 2;
 212         int Newz = (int)((Z1 + Z2 + Z3 + Z4) / 4 + (double)(Random(17) - 8) / 8.0 * Std);
 213
 214         if (--Iteration)
 215         {
 216                 int Z12 = (Z1 + Z2) / 2;
 217                 int Z34 = (Z3 + Z4) / 2;
 218                 double Stdmid = Std * Ratio;
 219
 220                 Fractal(dc, Xmid, Y1, X2, Ymid, Z12, Z2, Z23, Newz, Iteration, Stdmid, Ratio);
 221                 Fractal(dc, X1, Y1, Xmid, Ymid, Z1, Z12, Newz, Z41, Iteration, Stdmid, Ratio);
 222                 Fractal(dc, Xmid, Ymid, X2, Y2, Newz, Z23, Z3, Z34, Iteration, Stdmid, Ratio);
 223                 Fractal(dc, X1, Ymid, Xmid, Y2, Z41, Newz, Z34, Z4, Iteration, Stdmid, Ratio);
 224         }
 225         else
 226         {
 227                 if (Newz <= Sealevel)
 228                 {
 229                         wxPoint P[4];
 230                         P[0].x = Y1 / 2 + X1;   P[0].y = Y1 + Z1;
 231                         P[1].x = Y1 / 2 + X2;   P[1].y = Y1 + Z2;
 232                         P[2].x = Y2 / 2 + X2;   P[2].y = Y2 + Z3;
 233                         P[3].x = Y2 / 2 + X1;   P[3].y = Y2 + Z4;
 234
 235                         dc.SetPen(* wxBLACK_PEN);
 236                         dc.SetBrush(* wxBLACK_BRUSH);
 237
 238                         dc.DrawPolygon(4, P);
 239
 240                         if (Z1 >= -(60+Random(25)))
 241                                 dc.SetPen(GreenPen);
 242                         else if (Z1 >= -(100+Random(25)))
 243                                 dc.SetPen(MtnPen);
 244                         else
 245                                 dc.SetPen(SnowPen);
 246
 247                         dc.DrawLine(Ymid/2+X2, Ymid+Z23, Ymid/2+X1, Ymid+Z41);
 248                 }
 249         }
 250 }
 251