mandelbrot.c

#include <windows.h>
#include <conio.h>
#include <stdlib.h>
char *title = "Mandelbrot Set";
#define SIZE 600
#define ITERS 25
int main()
{
    int x, y, i;
    double zx, zy, cx, cy, tmp;

    HWND hwnd;
    HDC hdc;
    system("cls");
    SetConsoleTitle(title);
    hwnd = FindWindow(NULL, title);
    hdc = GetDC(hwnd);
    /***/
    for (y = 1; y < SIZE; y++)
        for (x = 1; x < SIZE; x++)
        {
            zx = cx = 	 -2+2.5*x/SIZE;
            zy = cy = -1.25+2.5*y/SIZE;
            for (i = 0; i < ITERS; i++)
            {
                tmp = zx * zx - zy * zy + cx;
                zy = 2.0 * zx * zy + cy;
                zx = tmp;

                if (zx*zx + zy*zy > 4) break;
            }
            i = 250 - 250/ITERS*i;
            SetPixel(hdc, x, y, RGB(i,i,i));
        }

    /***/
    ReleaseDC(hwnd, hdc);
    DeleteDC(hdc);
    _getch();
    return(0);
}