#include <complex>
#include <ifmwindow>
using namespace std;

int main()
{
    const int    nMax      = 150;
    const double maxNorm   = 1e2;
    const int    width     = wio.xmax() - wio.xmin();
    const int    height    = wio.ymax() - wio.ymin();
    const int    maxColor  = wio.number_of_colors() - 2; 

    double       x0 = -2., y0 = -2., h = 4./width;

    while (true) {
        int col, row, n;
        for (row = 0; row <= height; row++) {
            for (col = 0; col <= width; col++) {
                complex<double> c(x0+col*h, y0+row*h), z(0,0);
    
                for (n = 0; n < nMax && norm(z) < maxNorm; n++) z = z*z+c; 
    
                wio << color(n*maxColor / nMax) << Point(col,row);
            }
	    wio << flush;
	}

	while (!wio.check_key() && !wio.check_mouse_click()); // wait for event
	if (wio.check_key()) break;

        int button = wio.get_mouse_click(col, row); 

        switch (button) {         // L: zoom in, M: set center, R: zoom out
	    case 1: h /= 2.;  x0 += col*h;  y0 += row*h;             break;
            case 2: x0 -= (width/2.-col)*h; y0 -= (height/2.-row)*h; break;
	    case 3: x0 -= col*h;  y0 -= row*h;  h *= 2.;             break;
	}
    }
    return 0;
}