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////////////////////////////////////////////////////////////////////////////////
// trigger_look (a.k.a. trigger_onlookat from NullPointPaladin!)
////////////////////////////////////////////////////////////////////////////////

//======================================================================
// forward declarations
//======================================================================

void() trigger_look_use;
void() trigger_look_touch;
void(entity e) trigger_look_init;
void() trigger_look;

//------------------------------------------------------------------------------

/*QUAKED trigger_look (.5 .5 .5) ? X X X X X X X X NOT_ON_EASY NOT_ON_NORMAL NOT_ON_HARD_OR_NIGHTMARE NOT_IN_DEATHMATCH NOT_IN_COOP NOT_IN_SINGLEPLAYER X NOT_ON_HARD_ONLY NOT_ON_NIGHTMARE_ONLY
This will trigger when a player is within the brush trigger and looks directly at a target entity.
Use the first target key for the "looked at entity" and use the subsequent targets (2-4) to trigger other events.

speed = Distance from player to search for trigger, adjust if the target is too far from the trigger  (default 500 units)
wait = Time between re-triggering (default 0)
sounds = 0-3 are standard Quake trigger choices, 4 allows a custom sound, requires a path set in noise1 key
noise1 = Path to custom sound. Use with sounds key set to 4  (e.g. fish/bite.wav)

See manual for complete details. See pd_cutscenes sample map for example
*/
//----------------------------------------------------------------------
// class trigger_look: base_multiple
// {
        //--------------------------------------------------------------
        void() trigger_look_use =
        {
                base_multiple_fire ();
        };

        //--------------------------------------------------------------
        void() trigger_look_touch =
        {
                // from Copper -- dumptruck_ds
                if (sub_checkvalidtouch(other) == FALSE)
                        return;

                if (self.nextthink > time)
                        // already been triggered
                        return;

                // added player view offset to make self more accurate
                // to the player crosshairs
                local vector player_offset = other.origin + other.view_ofs;

                makevectors (other.v_angle);

                // using speed to determine the reach of the trace
                if (!self.speed)
                        self.speed = 500;

                traceline (player_offset,
                        (player_offset + (v_forward * self.speed)),
                                FALSE, other);

                if (trace_ent.targetname == self.target)
                {
                        // Play message if available
                        if (self.message != "")
                                centerprint (other, self.message);

                        self.use = trigger_look_use;
                        sub_usetargets ();

                                if (self.noise != "")
                                        sound (self, CHAN_VOICE, self.noise, 1,
                                                ATTN_NORM);
                                else
                                        sound (self, CHAN_VOICE, self.noise1, 1,
                                                ATTN_NORM);

                        // added wait
                        if (self.wait > 0)
                        {
                                self.think = base_multiple_think_wait;
                                self.nextthink = time + self.wait;
                        }
                        else
                        {
                                // we can't just remove (self) here, because
                                // self is a touch function called while C
                                // code is looping through area links...
                                self.think = sub_remove;
                                self.touch = sub_null;
                                self.use = sub_null;
                                self.nextthink = time + 0.1;
                        }
                }
        };

        //--------------------------------------------------------------
        void(entity e) trigger_look_init =
        {
                e.classname = "trigger_look";
                e.classtype = CT_TRIGGER_LOOK;

                // play all the sounds available for a normal trigger
                if (e.sounds == 0)
                {
                        precache_sound ("misc/null.wav");
                        e.noise = "misc/null.wav";
                }
                else if (e.sounds == 1)
                {
                        precache_sound ("misc/secret.wav");
                        e.noise = "misc/secret.wav";
                }
                else if (e.sounds == 2)
                {
                        precache_sound ("misc/talk.wav");
                        e.noise = "misc/talk.wav";
                }
                else if (e.sounds == 3)
                {
                        precache_sound ("misc/trigger1.wav");
                        e.noise = "misc/trigger1.wav";
                }
                else if (e.sounds == 4)
                {
                        if (!e.noise1)
                        {
                                // dumptruck_ds
                                objerror ("trigger_look_init: no soundfile "
                                        "set in noise1!\n");
                                remove (e);
                                return;
                        }
                        else
                        {
                                precache_sound (e.noise1);
                        }
                        e.noise = e.noise1;
                }

                base_trigger_init (e);
                e.touch = trigger_look_touch;
                sub_checkwaiting (e);
        };

        //--------------------------------------------------------------
        void() trigger_look =
        {
                // new spawnflags for all entities -- iw
                if (SUB_Inhibit())
                        return;

                trigger_look_init (self);
        };
// };