Grid of Concentric Circles

Code

#include <sketch.h>

float max(float a, float b) {
    return a>b? a: b;
}

void concentric_circles(float x, float y, float radius, int n)
{
    float r = radius/n;

    for (int i=1; i<=n; i++) {
        draw_circle(x, y, i*r);
    }
}

void draw_shape(float x, float y, float size, int i, int j, int n) {
    concentric_circles(x, y, size/2, 1+max(i, j));
}

void make_grid(int n)
{
    float dx = 600/n;
    float dy = dx;

    float x0 = -300+dx/2;
    float y0 = -300+dy/2;

    for (int i=0; i<n; i++)
    {
        for (int j=0; j<n; j++)
        {
            float x = x0+i*dx;
            float y = y0+j*dy;
            draw_shape(x, y, dx, i, j, n);
        }
    }
}

int main() {
    make_grid(5);
    save_sketch("grid-of-concentric-circles.svg");
}