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 wxWidgets, and my quick
  27 hack doesn't fix.
  28 */
  29
  30 #include "wx/wxprec.h"
  31
  32 #ifdef __BORLANDC__
  33     #pragma hdrstop
  34 #endif
  35
  36 #ifndef  WX_PRECOMP
  37   #include "wx/wx.h"
  38 #endif //precompiled headers
  39
  40 #include "wx/math.h"
  41 #include "wx/stockitem.h"
  42
  43 #include <stdlib.h>
  44 #include <time.h>
  45
  46 #define Random(x) (rand() % x)
  47 #define Randomize() (srand((unsigned int)time(NULL)))
  48
  49 static int detail = 9; // CHANGE THIS... 7,8,9 etc
  50
  51 static bool running = false;
  52 static wxMenuBar *menuBar = NULL;
  53
  54 // Define a new application type
  55 class MyApp: public wxApp
  56 {
  57 public:
  58     bool OnInit();
  59 };
  60
  61 IMPLEMENT_APP(MyApp)
  62
  63 // Define a new frame type
  64 class MyFrame: public wxFrame
  65 {
  66 public:
  67     MyFrame(wxFrame *frame, const wxString& title, const wxPoint& pos, const wxSize& size);
  68
  69     void OnCloseWindow(wxCloseEvent& event);
  70     void OnExit(wxCommandEvent& event);
  71
  72     DECLARE_EVENT_TABLE()
  73 };
  74
  75 // Define a new canvas which can receive some events
  76 class MyCanvas: public wxWindow
  77 {
  78 public:
  79     MyCanvas(wxFrame *frame);
  80     void Draw(wxDC& dc);
  81
  82 private:
  83     void OnPaint(wxPaintEvent& event);
  84     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);
  85     wxPen SnowPen, MtnPen, GreenPen;
  86     wxBrush WaterBrush;
  87     int Sealevel;
  88
  89 DECLARE_EVENT_TABLE()
  90 };
  91
  92 // `Main program' equivalent, creating windows and returning main app frame
  93 bool MyApp::OnInit()
  94 {
  95   // Create the main frame window
  96   MyFrame *frame = new MyFrame(NULL, wxT("Fractal Mountains for wxWidgets"), wxDefaultPosition, wxSize(640, 480));
  97
  98   // Make a menubar
  99   wxMenu *file_menu = new wxMenu;
 100   file_menu->Append(wxID_EXIT, wxGetStockLabel(wxID_EXIT));
 101   menuBar = new wxMenuBar;
 102   menuBar->Append(file_menu, wxT("&File"));
 103   frame->SetMenuBar(menuBar);
 104
 105   int width, height;
 106   frame->GetClientSize(&width, &height);
 107
 108   (void) new MyCanvas(frame);
 109
 110   // Show the frame
 111   frame->Show(true);
 112
 113   return true;
 114 }
 115
 116 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 117   EVT_CLOSE(MyFrame::OnCloseWindow)
 118   EVT_MENU(wxID_EXIT, MyFrame::OnExit)
 119 END_EVENT_TABLE()
 120
 121 // My frame constructor
 122 MyFrame::MyFrame(wxFrame *frame, const wxString& title, const wxPoint& pos, const wxSize& size):
 123   wxFrame(frame, wxID_ANY, title, pos, size, wxDEFAULT_FRAME_STYLE | wxFULL_REPAINT_ON_RESIZE )
 124 {
 125 }
 126
 127 // Intercept menu commands
 128 void MyFrame::OnExit(wxCommandEvent& WXUNUSED(event))
 129 {
 130     this->Destroy();
 131 }
 132
 133 void MyFrame::OnCloseWindow(wxCloseEvent& WXUNUSED(event))
 134 {
 135     static bool destroyed = false;
 136     if (destroyed)
 137         return;
 138
 139     this->Destroy();
 140
 141     destroyed = true;
 142 }
 143
 144 BEGIN_EVENT_TABLE(MyCanvas, wxWindow)
 145   EVT_PAINT(MyCanvas::OnPaint)
 146 END_EVENT_TABLE()
 147
 148 // Define a constructor for my canvas
 149 MyCanvas::MyCanvas(wxFrame *frame):
 150  wxWindow(frame, wxID_ANY)
 151 {
 152     wxColour wxCol1(255,255,255);
 153     SnowPen = wxPen(wxCol1, 2, wxSOLID);
 154
 155     wxColour wxCol2(128,0,0);
 156     MtnPen = wxPen(wxCol2, 1, wxSOLID);
 157
 158     wxColour wxCol3(0,128,0);
 159     GreenPen = wxPen(wxCol3, 1, wxSOLID);
 160
 161     wxColour wxCol4(0,0,128);
 162     WaterBrush = wxBrush(wxCol4, wxSOLID);
 163 }
 164
 165 void MyCanvas::OnPaint(wxPaintEvent& WXUNUSED(event))
 166 {
 167     wxPaintDC dc(this);
 168     PrepareDC(dc);
 169     Draw(dc);
 170 }
 171
 172 void MyCanvas::Draw(wxDC& dc)
 173 {
 174     if (running) return;
 175
 176     running = true;
 177     menuBar->EnableTop(0, false);
 178
 179     Randomize();
 180
 181     dc.SetBackground(*wxLIGHT_GREY_BRUSH);
 182     dc.Clear();
 183
 184     int Left, Top, Right, Bottom;
 185     GetClientSize(&Right, &Bottom);
 186
 187     Right *= 3; Right /= 4;
 188     Bottom *= 3; Bottom /= 4;
 189     Left = 0;
 190     Top = Bottom/8;
 191
 192     wxPoint Water[4];
 193     Water[0].x = Left;            Water[0].y = Top;
 194     Water[1].x = Right;           Water[1].y = Top;
 195     Water[2].x = Right+Bottom/2;  Water[2].y = Bottom;
 196     Water[3].x = Bottom/2;        Water[3].y = Bottom;
 197
 198     dc.SetBrush(WaterBrush);
 199     dc.DrawPolygon(4, Water);
 200
 201     double H = 0.75;
 202     double Scale = Bottom;
 203     double Ratio = 1.0 / pow(2.0, H);
 204     double Std = Scale * Ratio;
 205     Sealevel = Random(18) - 8;
 206
 207     Fractal(dc, Left, Top, Right, Bottom, 0, 0, 0, 0, detail, Std, Ratio);
 208
 209     menuBar->EnableTop(0, true);
 210     running = false;
 211 }
 212
 213 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)
 214 {
 215     int Xmid = (X1 + X2) / 2;
 216     int Ymid = (Y1 + Y2) / 2;
 217     int Z23 = (Z2 + Z3) / 2;
 218     int Z41 = (Z4 + Z1) / 2;
 219     int Newz = (int)((Z1 + Z2 + Z3 + Z4) / 4 + (double)(Random(17) - 8) / 8.0 * Std);
 220
 221     if (--Iteration)
 222     {
 223         int Z12 = (Z1 + Z2) / 2;
 224         int Z34 = (Z3 + Z4) / 2;
 225         double Stdmid = Std * Ratio;
 226
 227         Fractal(dc, Xmid, Y1, X2, Ymid, Z12, Z2, Z23, Newz, Iteration, Stdmid, Ratio);
 228         Fractal(dc, X1, Y1, Xmid, Ymid, Z1, Z12, Newz, Z41, Iteration, Stdmid, Ratio);
 229         Fractal(dc, Xmid, Ymid, X2, Y2, Newz, Z23, Z3, Z34, Iteration, Stdmid, Ratio);
 230         Fractal(dc, X1, Ymid, Xmid, Y2, Z41, Newz, Z34, Z4, Iteration, Stdmid, Ratio);
 231     }
 232     else
 233     {
 234         if (Newz <= Sealevel)
 235         {
 236             wxPoint P[4];
 237             P[0].x = Y1 / 2 + X1;    P[0].y = Y1 + Z1;
 238             P[1].x = Y1 / 2 + X2;    P[1].y = Y1 + Z2;
 239             P[2].x = Y2 / 2 + X2;    P[2].y = Y2 + Z3;
 240             P[3].x = Y2 / 2 + X1;    P[3].y = Y2 + Z4;
 241
 242             dc.SetPen(* wxBLACK_PEN);
 243             dc.SetBrush(* wxBLACK_BRUSH);
 244
 245             dc.DrawPolygon(4, P);
 246
 247             if (Z1 >= -(60+Random(25)))
 248                 dc.SetPen(GreenPen);
 249             else if (Z1 >= -(100+Random(25)))
 250                 dc.SetPen(MtnPen);
 251             else
 252                 dc.SetPen(SnowPen);
 253
 254             dc.DrawLine(Ymid/2+X2, Ymid+Z23, Ymid/2+X1, Ymid+Z41);
 255         }
 256     }
 257 }
 258