Mandelbrot Fractal

This is a simple version of drawing fractal program using MFC.


// menus.h

#define IDM_DODRAW 1001
#define IDM_EXIT 1002


#include <windows.h>
#include <afxres.h>

#include "menus.h"

MainMenu MENU
{
  POPUP "&File"
  {
    MENUITEM "&Draw", IDM_DODRAW MENUITEM "E&xit", IDM_EXIT
  }
}

#include "afxwin.h"
#include "menus.h"
#pragma comment(lib,"nafxcw")
#define NUM_ITERATIONS 64

const double left =  - 1.0;
const double right = 1.0;
const double top =  - 1.0;
const double bottom = 1.0;

DWORD colors[64];

typedef struct
{
  double real;
  double imag;
} complex;

// Define the application object class
class CManApp: public CWinApp
{
  public:
    virtual BOOL InitInstance();
};

// Define the edit window class
class CManWindow: public CFrameWnd
{
  public:
    CManWindow();
    void RunMandel();
    void SetPix(int x, int y, WORD iter);
    afx_msg void OnPaint();
    afx_msg void OnDoDraw();
    afx_msg void OnExit();
    DECLARE_MESSAGE_MAP()
};

// Create an instance of the application object
CManApp manApp;

// member function used to set pixel colors in
// the window
void CManWindow::SetPix(int x, int y, WORD iter)
{
  CClientDC dc(this);
  dc.SetPixel(x, y, colors[iter]);
}

// member function used to redraw the
// mandelbrot set
void CManWindow::RunMandel()

{
  CRect r;
  double xstep, ystep;
  double x, y;
  int i, j;
  WORD iter;
  complex k;
  complex z;
  double real, imag, spread;

  GetClientRect(&r);

  ystep = (double)(bottom - top) / r.Height();
  xstep = (double)(right - left) / r.Width();

  for (y = top, j = 0; y <= bottom; y += ystep, j++)
  {
    for (x = left, i = 0; x <= right; x += xstep, i++)
    {
      k.real = x;
      k.imag = y;
      z.real = z.imag = 0.0;
      for (iter = 0; iter 4.0)
        break;
    }
    ((CManWindow*)manApp.m_pMainWnd)->SetPix(i, j, iter);
  }
}

}

// The message map
BEGIN_MESSAGE_MAP(CManWindow, CFrameWnd)ON_WM_PAINT()ON_COMMAND(IDM_DODRAW,
  OnDoDraw)ON_COMMAND(IDM_EXIT, OnExit)END_MESSAGE_MAP()

// Handler for the Draw menu option
void CManWindow::OnDoDraw()
{
  // clear the window
  CClientDC dc(this);
  CRect r;
  GetClientRect(&r);
  dc.PatBlt(0, 0, r.Width(), r.Height(), WHITENESS);
  // Redraw the set
  RunMandel();
}

// Handler for WM_PAINT messages
void CManWindow::OnPaint()
{
  // Do not do anything in response to
  // paint events
  ValidateRect(NULL);
}

// Handler for the Exit menu option
void CManWindow::OnExit()
{
  DestroyWindow();
}

// CManWindow constructor
CManWindow::CManWindow()
{
  WORD x;
  BYTE red = 0, green = 0, blue = 0;

  Create(NULL, ONormal Mandel ExampleO, WS_OVERLAPPEDWINDOW, CRect(0, 0, 150,
    150), NULL, OMainMenuO);
  for (x = 0; x < 64; x++)
  {
    colors[x] = RGB(red, green, blue);
    if (!(red += 64))
      if (!(green += 64))
        blue += 64;
  }
  colors[63] = RGB(255, 255, 255);
} 
  // Initialize the CManApp m_pMainWnd data member BOOL CManApp::InitInstance() { m_pMainWnd = new CManWindow(); m_pMainWnd -> ShowWindow( m_nCmdShow );
m_pMainWnd->UpdateWindow();

return TRUE;
}

Compile resource: rc mandel.rc
Compile project: cl /EHsc mandel.cpp /link /SUBSYSTEM:WINDOWS /RELEASE mandel.res
Download project here