//usr/bin/clang "$0" && exec ./a.out

// mandelbrot

#include <stdio.h>

int RESOLUTION_X = 150;

int RESOLUTION_Y = 60;

double OUTPUT_RES_X = 3.5;

double OUTPUT_RES_Y = 2;

double OUTPUT_OFFSET_X = -2.5;

int OUTPUT_OFFSET_Y = -1;

int MAX_ITERATIONS=27;

int calc(double xi, double yi) {

    xi = xi/ RESOLUTION_X * OUTPUT_RES_X + OUTPUT_OFFSET_X;

    yi = yi / RESOLUTION_Y * OUTPUT_RES_Y + OUTPUT_OFFSET_Y;

    double x = 0.0;

    double y = 0.0;

    int iteration = 0;

    while( x*x + y*y < 4 && iteration < MAX_ITERATIONS) {

        double xtemp = x*x - y*y + xi;

        y = 2*x*y + yi;

        x = xtemp;

        iteration += 1;

    }

    return iteration;

}

char show(int value) {

    return  value <= 26 ? ('A' + value - 1) : ' ';

}

void draw_window(int w, int h) {

  for (int yi = 0; yi < h; yi++) {

    for (int xi = 0; xi < w; xi++) {

        char value = show(calc(xi, yi));

        printf("%c", value);

    }

    puts("");

  }

}

int main() {

  draw_window(RESOLUTION_X, RESOLUTION_Y);

}