add a helper W_Crylink_LinkJoin to be used by tZork's balance in the future

diff --git a/qcsrc/server/w_crylink.qc b/qcsrc/server/w_crylink.qc
index 86306e5fa3ebb46977a2883acf4d7af1c7684a5b..1a05c8a4a2fc09c4bb7796299063fcf63812b85a 100644 (file)
--- a/qcsrc/server/w_crylink.qc
+++ b/qcsrc/server/w_crylink.qc
@@ -20,6 +20,82 @@ void W_Crylink_LinkExplode (entity e, entity e2)
        remove (e);
 }
 
+// adjust towards center
+// returns the origin where they will meet... and the time till the meeting is
+// stored in w_crylink_linkjoin_time.
+// could possibly network this origin and time, and display a special particle
+// effect when projectiles meet there :P
+float w_crylink_linkjoin_time;
+vector W_Crylink_LinkJoin(entity e, float joinspeed)
+{
+       vector avg_origin, avg_velocity;
+       vector targ_origin;
+       float avg_dist, n;
+       entity p;
+
+       avg_origin = e.origin;
+       avg_velocity = e.velocity;
+       n = 1;
+       for(p = e; (p = p.queuenext) != e; )
+       {
+               avg_origin += p.origin;
+               avg_velocity += p.velocity;
+               ++n;
+       }
+       avg_origin *= (1.0 / n);
+       avg_velocity *= (1.0 / n);
+
+       // yes, mathematically we can do this in ONE step, but beware of 32bit floats...
+       avg_dist = pow(vlen(e.origin - avg_origin), 2);
+       for(p = e; (p = p.queuenext) != e; )
+               avg_dist += pow(vlen(e.origin - avg_origin), 2);
+       avg_dist *= (1.0 / n);
+
+       w_crylink_linkjoin_time = 0;
+       if(avg_dist == 0)
+               return avg_origin; // no change needed
+
+       if(joinspeed == 0)
+       {
+               e.velocity = avg_velocity;
+               UpdateCSQCProjectile(e);
+               for(p = e; (p = p.queuenext) != e; )
+               {
+                       p.velocity = avg_velocity;
+                       UpdateCSQCProjectile(p);
+               }
+       }
+       else
+       {
+               w_crylink_linkjoin_time = avg_dist / joinspeed;
+               targ_origin = avg_origin + w_crylink_linkjoin_time * avg_velocity;
+
+               e.velocity = (targ_origin - e.origin) * (joinspeed / avg_dist);
+               UpdateCSQCProjectile(e);
+               for(p = e; (p = p.queuenext) != e; )
+               {
+                       p.velocity = (targ_origin - p.origin) * (joinspeed / avg_dist);
+                       UpdateCSQCProjectile(p);
+               }
+
+               // analysis:
+               //   joinspeed -> +infinity:
+               //      w_crylink_linkjoin_time -> +0
+               //      targ_origin -> avg_origin
+               //      p->velocity -> HUEG towards center
+               //   joinspeed -> 0:
+               //      w_crylink_linkjoin_time -> +/- infinity
+               //      targ_origin -> avg_velocity * +/- infinity
+               //      p->velocity -> avg_velocity
+               //   joinspeed -> -infinity:
+               //      w_crylink_linkjoin_time -> -0
+               //      targ_origin -> avg_origin
+               //      p->velocity -> HUEG away from center
+       }
+
+       return targ_origin;
+}
+
 // NO bounce protection, as bounces are limited!
 void W_Crylink_Touch (void)
 {