function scr_marker_centered(arg0, arg1, arg2, arg3 = 1, arg4 = 1, arg5 = 0, arg6 = 0, arg7 = 16777215, arg8 = depth, arg9 = false, arg10 = -1, arg11 = 1, arg12 = 0, arg13 = false)
{
    var thismarker = instance_create(arg0, arg1, obj_marker_centerpoint);
    with (thismarker)
    {
        depth = arg8;
        sprite_index = arg2;
        image_speed = arg5;
        image_xscale = arg3;
        image_yscale = arg4;
        image_index = arg6;
        image_blend = arg7;
        image_alpha = arg11;
        if (arg9)
            scr_depth_alt();
        blend = arg12;
        fog = arg13;
    }
    if (arg10 > 0)
        scr_doom(thismarker, arg10);
    return thismarker;
}

function scr_afterimage_centered(arg0 = id, arg1 = 30, arg2 = 0, arg3 = false, arg4 = image_blend, arg5 = image_alpha)
{
    var _centermarker = instance_create(arg0.x, arg0.y, obj_marker_centerpoint);
    _centermarker.sprite_index = arg0.sprite_index;
    _centermarker.image_angle = arg0.image_angle;
    _centermarker.image_index = arg0.image_index;
    _centermarker.image_speed = arg0.image_speed;
    _centermarker.image_xscale = arg0.image_xscale;
    _centermarker.image_yscale = arg0.image_yscale;
    _centermarker.mask_index = arg0.mask_index;
    _centermarker.depth = arg0.depth;
    _centermarker.blend = arg2;
    _centermarker.fog = arg3;
    _centermarker.image_blend = arg4;
    _centermarker.image_alpha = arg5;
    with (_centermarker)
    {
        var offset_x = (sprite_width / 2) - (sprite_get_xoffset(sprite_index) * image_xscale);
        var offset_y = (sprite_height / 2) - (sprite_get_yoffset(sprite_index) * image_yscale);
        var rotated_x = lengthdir_x(offset_x, image_angle) - lengthdir_y(offset_y, image_angle);
        var rotated_y = lengthdir_y(offset_x, image_angle) + lengthdir_x(offset_y, image_angle);
        var xloc = x + rotated_x;
        var yloc = y + rotated_y;
        setxy(xloc, yloc);
    }
    with (_centermarker)
        scr_lerpvar("image_alpha", image_alpha, 0, arg1);
    scr_doom(_centermarker, arg1 + 1);
    return _centermarker;
}

function scr_marker_centered_frominstance(arg0, arg1 = false, arg2 = image_blend, arg3 = 0)
{
    var _centermarker = instance_create(arg0.x, arg0.y, obj_marker_centerpoint);
    _centermarker.sprite_index = arg0.sprite_index;
    _centermarker.image_angle = arg0.image_angle;
    _centermarker.image_index = arg0.image_index;
    _centermarker.image_speed = arg0.image_speed;
    _centermarker.image_xscale = arg0.image_xscale;
    _centermarker.image_yscale = arg0.image_yscale;
    _centermarker.mask_index = arg0.mask_index;
    _centermarker.depth = arg0.depth;
    _centermarker.blend = arg3;
    _centermarker.fog = arg1;
    _centermarker.image_blend = arg2;
    with (_centermarker)
    {
        var offset_x = (sprite_width / 2) - (sprite_get_xoffset(sprite_index) * image_xscale);
        var offset_y = (sprite_height / 2) - (sprite_get_yoffset(sprite_index) * image_yscale);
        var rotated_x = lengthdir_x(offset_x, image_angle) - lengthdir_y(offset_y, image_angle);
        var rotated_y = lengthdir_y(offset_x, image_angle) + lengthdir_x(offset_y, image_angle);
        var xloc = x + rotated_x;
        var yloc = y + rotated_y;
        setxy(xloc, yloc);
    }
    return _centermarker;
}