class Lignes {

    public static void main(String[] args) {
        DrawingWindow w = new DrawingWindow("Lignes", 640, 480);

        final int dx = 20;
        final int dy = (dx * w.height) / w.width;
        int x = 0;
        int y = dy;
        while (x < w.width) {
            w.drawLine(x, 0, w.width - 1, y);
            x += dx;
            y += dy;
        }
    }
}