console mandelbrot zoomer

mandelbrot_zoom.c

#include <stdio.h>
#include <complex.h>
#include <math.h>


double tx = -0.1;
double ty = 0.651;

void mandelbrot_draw(const unsigned int width, const unsigned int height)
{
#define MAX_ITER 50
    unsigned int x, y;
    const char *magnitude = " .*oO@@@@@";
    
    for (y = 0; y < height; y++) {
        for (x = 0; x < width; x++) {
            double x_t = ((double) x / width * 2.0) - 1.5; /* [-2.5, 1] */
            double y_t = ((double) y / height * 1.5) - .5;  /* [ -1,  1] */
            double _Complex z = 0. + 0.*_Complex_I;
            double _Complex c = x_t/tx + y_t/ty*_Complex_I;
 
            unsigned int n = 0;
 
            while ( (cabs(z) < 2.0) && n++ != MAX_ITER ) {
                z = z * z + c;
            }                   
                        
            n = ((double) n / MAX_ITER) * 9; /* [0, 9] */
            putchar(magnitude[n]);
 
        }
        printf("\n");
    }
#undef MAX_ITER
}
 

int main(int argc, char *argv[])
{   
    while (1) { 
        mandelbrot_draw(70, 22);
        tx += 0.01;
        ty += 0.01;
        system("cls");
    }
    return 0;
}