Function arti_light_radius

src/light.c:880–911

light emitting artifact's range depends upon its curse/bless state */

/* light emitting artifact's range depends upon its curse/bless state */
int
arti_light_radius(struct obj *obj)
{
    int res;

    /*
     * Used by begin_burn() when setting up a new light source
     * (obj->lamplit will already be set by this point) and
     * also by bless()/unbless()/uncurse()/curse() to decide
     * whether to call obj_adjust_light_radius().
     */

    /* sanity check [simplifies usage by bless()/curse()/&c] */
    if (!obj->lamplit || !artifact_light(obj))
        return 0;

    /* cursed radius of 1 is not noticeable for an item that's
       carried by the hero but is if it's carried by a monster
       or left lit on the floor (not applicable for Sunsword) */
    res = (obj->blessed ? 3 : !obj->cursed ? 2 : 1);

    /* if poly'd into gold dragon with embedded scales, make the scales
       have minimum radiance (hero as light source will use light radius
       based on monster form); otherwise, worn gold DSM gives off more
       light than other light sources */
    if (obj == uskin)
        res = 1;
    else if (obj->otyp == GOLD_DRAGON_SCALE_MAIL) /* DSM but not scales */
        ++res;

    return res;
}

/* adverb describing lit artifact's light; radius varies depending upon
   curse/bless state; also used for gold dragon scales/scale mail */