#include "svg.h"
#define XSTEP 24
#define YSTEP 24
#define SIZE  60
#define XN 3
#define YN 3
#define MARGIN_X ((297.0-SIZE*XN)/(XN+1))
#define MARGIN_Y ((210.0-SIZE*YN)/(YN+1))

void gradationSquare(double l, double x, double y, double w, double h) {
    int i, j;

    for (i=0; i<XSTEP; i++) {
        for (j=0; j<YSTEP; j++){
            fill(hsl360(i*360/XSTEP, (j+1)*100/YSTEP, l));
            rect(x+w*i/XSTEP, y+h*j/YSTEP, w/XSTEP, h/YSTEP);
        }
    }
}

int main(void) {
    int i, j;
    double y = MARGIN_Y;
    int k=1;

    start();
    noStroke();
    textFont("Courier New", 4);
    for (i=0; i<YN; i++) {
        double x = MARGIN_X;
        for (j=0; j<XN; j++) {
            double l = k*100.0/(XN*YN+1);
            fill(0);
            text("l=%0.2f", x, y-1, l);
            gradationSquare(l, x, y, SIZE, SIZE);
            k++;
            x += MARGIN_X + SIZE;
        }
        y += MARGIN_Y + SIZE;
    }

    finish();
    return 0;
}