[C++ / GrAPic] Circular Squares Fractal

#include <Grapic.h>
#include <math.h>
const int DIMW = 900;
using namespace grapic;
const double rayon = 1.f;
const double range = 0.0000001f;

const int depth = 12;
// the higher it is, the more squares there are !

struct Point {
    double x;
    double y;
};
struct square {
    Point coord;
    double length;
};
square initsqr () {
    square ret;
    ret.coord.x = 1;
    ret.coord.y = 1;
    return ret;
}
Point coord (double x, double y) {
    Point ret;
    ret.x = x;
    ret.y = y;
    return ret;
}
void solve (square &sq, Point start) {
    sq.coord = start;
    sq.length = 0;
    while ((sq.coord.x)*(sq.coord.x)
          +(sq.coord.y)*(sq.coord.y) > (1+range)*(1+range)) {
        sq.coord.x -= range;
        sq.coord.y -= range;
        sq.length += range;
    }
    color(127,127,127,255);
    rectangleFill(sq.coord.x*(DIMW-10),sq.coord.y*(DIMW-10),
             (sq.coord.x+sq.length)*(DIMW-10),
             (sq.coord.y+sq.length)*(DIMW-10));
    color(255,255,255,255);
    rectangle(sq.coord.x*(DIMW-10),sq.coord.y*(DIMW-10),
             (sq.coord.x+sq.length)*(DIMW-10),
             (sq.coord.y+sq.length)*(DIMW-10));
    winDisplay();
}
void tree (square sq, int d = 0) {
    if (d == depth) printf("");
    else {
        square L = sq, R = sq;
        L.coord.y += sq.length;
        R.coord.x += sq.length;
        solve(L,L.coord);
        solve(R,R.coord);
        tree(L,d+1);
        tree(R,d+1);
    }
}
int main(int, char**) {
    winInit("Bruh",DIMW,DIMW);
    backgroundColor(0,0,0);
    color(0,0,0);
    pressSpace();
    winClear();
    color(255,255,255);
    circle(0,0,DIMW-10);
    line(0,DIMW-10,DIMW-10,DIMW-10);
    line(DIMW-10,0,DIMW-10,DIMW-10);
    square sq = initsqr();
    solve(sq,sq.coord);
    tree(sq);
    pressSpace();
    winQuit();
}