_parent = -4;
_index = 0;
_increment = 0.4487989505128276;
_radius = 186;
_enemy_list = [];
_active = false;

create_enemy = function(arg0, arg1, arg2, arg3, arg4)
{
    var new_enemy = instance_create(arg1.x, arg1.y, obj_ch5_DW29_power_up_enemy);
    new_enemy.init(id, arg0, arg1, arg2, arg3, arg4);
    return new_enemy;
};

start = function(arg0)
{
    _parent = arg0;
    var sprite_list = [8442, 8039, 1830, 4675, 3435, 5659, 8324, 6329];
    var bullet_list = [4965, 5241, 6419, 5241, 7307, 2250, 95, 7740];
    var a = 2 * pi;
    while (a >= 0)
    {
        var xx = 1634 + (cos(a) * (_radius + 80));
        var yy = 460 + (sin(a) * _radius);
        var angle = point_direction(xx, yy, view_wport[0] / 2, yy);
        var modifier = ((_index % 2) == 0) ? -1 : 1;
        _enemy_list[_index] = create_enemy(sprite_list[_index], new Vector2(xx, yy), bullet_list[_index], angle, modifier);
        _index++;
        if (_index > (array_length(sprite_list) - 1))
            break;
        a -= _increment;
    }
    var fade_index = 0;
    var i = array_length(_enemy_list) - 1;
    while (i >= 0)
    {
        _enemy_list[i].set_index(fade_index);
        _enemy_list[i].fade_in(fade_index * 6);
        fade_index++;
        i--;
    }
    _active = true;
};

start_bullets = function()
{
    var i = array_length(_enemy_list) - 1;
    while (i >= 0)
    {
        _enemy_list[i].start_bullets();
        i--;
    }
};

is_active = function()
{
    return _active;
};

stop = function()
{
    var i = array_length(_enemy_list) - 1;
    while (i >= 0)
    {
        _enemy_list[i].stop();
        i--;
    }
};

end_sequence = function()
{
    var i = array_length(_enemy_list) - 1;
    while (i >= 0)
    {
        _enemy_list[i].end_sequence();
        i--;
    }
};

trigger_event = function(arg0)
{
    if (arg0 != "enemy_finished")
        exit;
    with (_parent)
        trigger_event("power_up_finished");
};

clean_up = function()
{
    var i = array_length(_enemy_list) - 1;
    while (i >= 0)
    {
        _enemy_list[i].clean_up();
        i--;
    }
    instance_destroy();
};