if (i_ex(target))
{
    if (init == 0)
    {
        if (is_string(pointa))
            pointa = variable_instance_get(target, varname);
        init = 1;
    }
    time++;
    if (easetype == 0)
    {
        variable_instance_set(target, varname, lerp(pointa, pointb, time / maxtime));
    }
    else
    {
        if (easeinout == "out")
            variable_instance_set(target, varname, lerp_ease_out(pointa, pointb, time / maxtime, easetype));
        if (easeinout == "in")
            variable_instance_set(target, varname, lerp_ease_in(pointa, pointb, time / maxtime, easetype));
        if (easeinout == "inout")
            variable_instance_set(target, varname, lerp_ease_inout(pointa, pointb, time / maxtime, easetype));
    }
    if (time >= maxtime)
        instance_destroy();
}
else
{
    instance_destroy();
}