///Moving the menu position
var move_vertical   = 0;
move_vertical   -= max(keyboard_check_pressed(vk_up),    keyboard_check_pressed(ord('Z')), 0);
move_vertical   += max(keyboard_check_pressed(vk_down),  keyboard_check_pressed(ord('S')), 0);

//move the menu position
if (move_vertical != 0) {
    menu_vpos += move_vertical;
    if (menu_vpos < 0) {
        menu_vpos = 3;
    }
    if (menu_vpos > 3) {
        menu_vpos = 0;
    }
}

//check if enter
var enter = max(keyboard_check_pressed(vk_enter), keyboard_check_pressed(vk_space), 0);

if (enter == 1) {
    switch (menu_vpos) {
        case 0:
            room_goto(rm_play);
            break;
        case 1:
            room_goto(rm_options);
            break;
        case 2:
            room_goto(rm_heart);
            break;
        case 3:
            game_end();
            break;
    }
}

switch (menu_vpos) {
    case 0:
        a_menu = 1;
        b_menu = 0;
        c_menu = 0;
        d_menu = 0;
        break;
    case 1:
        a_menu = 0;
        b_menu = 1;
        c_menu = 0;
        d_menu = 0;
        break;
    case 2:
        a_menu = 0;
        b_menu = 0;
        c_menu = 1;
        d_menu = 0;
        break;
    case 3:
        a_menu = 0;
        b_menu = 0;
        c_menu = 0;
        d_menu = 1;
        break;
}