Canon Ball Launcher

Canon Ball Launcher

If your code isn’t working or you want to get my numbers exactly, here’s my entire while loop. Feel free to use it (but add a comment in the code saying where you got this).

while (!hit_ground) {
    frame++;
    time += delta_t;

    // Euler integration step
    y = y + v_y * delta_t;
    v_y = v_y + a_y * delta_t;
    x = x + v_x * delta_t;

    // vx does not change.

    if (v_y < 0 && y <= radius) {
        hit_ground = true;
    }

    if (y > max_height) {
        max_height = y;
    }

    // Clear and draw
    StdDraw.clear(StdDraw.WHITE);
    StdDraw.setPenColor(StdDraw.BLUE);
    StdDraw.filledCircle(x, y, radius);

    StdDraw.show();
    StdDraw.pause(1000 / fps);

    // Print data rows (optional)
    System.out.printf("%-15.3f %-15.3f %-15.3f %-15.3f %-15.3f%n",
            time, x, y, v_x, v_y);
}