data/qcsrc/server/t_jumppads.qc

   1 float PUSH_ONCE                 = 1;
   2 float PUSH_SILENT               = 2;
   3
   4 .float pushltime;
   5 .float height;
   6
   7 float trigger_push_calculatevelocity_flighttime;
   8
   9 /*
  10         trigger_push_calculatevelocity
  11
  12         Arguments:
  13           org - origin of the object which is to be pushed
  14           tgt - target entity (can be either a point or a model entity; if it is
  15                 the latter, its midpoint is used)
  16           ht  - jump height, measured from the higher one of org and tgt's midpoint
  17
  18         Returns: velocity for the jump
  19         the global trigger_push_calculatevelocity_flighttime is set to the total
  20         jump time
  21  */
  22
  23 vector(vector org, entity tgt, float ht) trigger_push_calculatevelocity =
  24 {
  25         local float grav, sdist, zdist, vs, vz, jumpheight, trajsign;
  26         local vector sdir, torg;
  27
  28         torg = tgt.origin + (tgt.mins + tgt.maxs) * 0.5;
  29
  30         grav = cvar("sv_gravity");
  31
  32         zdist = torg_z - org_z;
  33         sdist = vlen(torg - org - zdist * '0 0 1');
  34         sdir = normalize(torg - org - zdist * '0 0 1');
  35
  36         // how high do we need to push the player?
  37         jumpheight = fabs(ht);
  38         if(zdist > 0)
  39                 jumpheight = jumpheight + zdist;
  40
  41         /*
  42                 STOP.
  43
  44                 You will not understand the following equations anyway...
  45                 But here is what I did to get them.
  46
  47                 I used the functions
  48
  49                   s(t) = t * vs
  50                   z(t) = t * vz - 1/2 grav t^2
  51
  52                 and solved for:
  53
  54                   s(ti) = sdist
  55                   z(ti) = zdist
  56                   max(z, ti) = jumpheight
  57
  58                 From these three equations, you will find the three parameters vs, vz
  59                 and ti.
  60          */
  61
  62         // push him so high...
  63         vz = sqrt(2 * grav * jumpheight); // NOTE: sqrt(positive)!
  64         if(ht < 0)
  65                 if(zdist < 0)
  66                         vz = -vz;
  67
  68         // how far to push him?
  69         if(zdist == 0)
  70         {
  71                 trigger_push_calculatevelocity_flighttime = sqrt(jumpheight * 8 / grav);
  72                 vs = sdist / trigger_push_calculatevelocity_flighttime;
  73                         // trajsign is ignored (the high point MUST be inside the jump!)
  74         }
  75         else
  76         {
  77                 if(ht > 0)
  78                         trajsign = +1;
  79                 else
  80                         trajsign = -1;
  81
  82                 // >0: the lower speed that achieves "it"
  83                 //     (parabola's maximum inside the jump)
  84                 // <0: the higher speed that achieves "it"
  85                 //     (parabola's maximum outside the jump)
  86
  87                 vs = sqrt(jumpheight - zdist);
  88                 vs = sqrt(jumpheight) - trajsign * vs; // fteqcc sucks
  89                 vs = fabs(vs * sqrt(grav/2) / zdist);
  90                 //vs = fabs((sdist / zdist) * sqrt(grav/2) * (sqrt(jumpheight) - trajsign * sqrt(jumpheight - zdist)));
  91                 trigger_push_calculatevelocity_flighttime = 1 / vs;
  92                         // note: vs cannot be zero here. The difference between the sqrts is zero IFF zdist == 0, which we have excluded.
  93                 vs = vs * sdist;
  94
  95                 // cases to test: "jump up", "jump down" with positive and negative height
  96         }
  97
  98         // finally calculate the velocity
  99         return sdir * vs + '0 0 1' * vz;
 100 }
 101
 102 void() trigger_push_touch =
 103 {
 104         // FIXME: add a .float for whether an entity should be tossed by jumppads
 105         if (other.classname != "player")
 106         if (other.classname != "corpse")
 107         if (other.classname != "body")
 108         if (other.classname != "gib")
 109         if (other.classname != "missile")
 110         if (other.classname != "casing")
 111         if (other.classname != "grenade")
 112         if (other.classname != "plasma")
 113         if (other.classname != "plasma_prim")
 114         if (other.classname != "plasma_chain")
 115         if (other.classname != "droppedweapon")
 116                 return;
 117
 118         if (other.deadflag && other.classname == "player")
 119                 return;
 120
 121         if (!self.target)
 122         {
 123                 other.velocity = self.movedir;
 124                 other.flags = other.flags - (other.flags & FL_ONGROUND);
 125                 return;
 126         }
 127
 128         if (other.classname == "player")
 129         {
 130                 local float i;
 131                 local float found;
 132                 if(self.pushltime < time)  // prevent "snorring" sound when a player hits the jumppad more than once
 133                 {
 134                         sound (other, CHAN_ITEM, "misc/jumppad.ogg", 1, ATTN_NORM);
 135                         self.pushltime = time + 0.5;
 136                 }
 137                 found = FALSE;
 138                 for(i = 0; i < other.jumppadcount && i < NUM_JUMPPADSUSED; ++i)
 139                         if(other.(jumppadsused[i]) == self)
 140                                 found = TRUE;
 141                 if(!found)
 142                 {
 143                         other.(jumppadsused[math_mod(other.jumppadcount, NUM_JUMPPADSUSED)]) = self;
 144                         other.jumppadcount = other.jumppadcount + 1;
 145                 }
 146         }
 147
 148         self.movedir = trigger_push_calculatevelocity(other.origin, self.enemy, self.height);
 149
 150         other.flags = other.flags - (other.flags & FL_ONGROUND);
 151         // reset tracking of oldvelocity for impact damage (sudden velocity changes)
 152         other.oldvelocity = other.velocity = self.movedir;
 153         // reset tracking of who pushed you into a hazard (for kill credit)
 154         other.pushltime = 0;
 155
 156         if (other.classname == "missile")
 157                 other.angles = vectoangles (other.velocity);
 158
 159         if (self.spawnflags & PUSH_ONCE)
 160         {
 161                 self.touch = SUB_Null;
 162                 self.think = SUB_Remove;
 163                 self.nextthink = time;
 164         }
 165 };
 166
 167 .vector dest;
 168
 169 void() trigger_push_findtarget =
 170 {
 171         local entity e;
 172         local vector org;
 173         local float flighttime;
 174
 175         // first calculate a typical start point for the jump
 176         org = (self.absmin + self.absmax) * 0.5;
 177         org_z = self.absmax_z - PL_MIN_z;
 178
 179         if (self.target)
 180         {
 181                 // find the target
 182                 self.enemy = find(world, targetname, self.target);
 183                 if (!self.enemy)
 184                 {
 185                         objerror("trigger_push: target not found\n");
 186                         remove(self);
 187                         return;
 188                 }
 189
 190                 self.movedir = trigger_push_calculatevelocity(org, self.enemy, self.height);
 191                 flighttime = trigger_push_calculatevelocity_flighttime;
 192         }
 193         else
 194                 flighttime = 0;
 195
 196         // calculate the destination and spawn a teleporter waypoint
 197         e = spawn();
 198         setorigin(e, org);
 199         setsize(e, PL_MIN, PL_MAX);
 200         e.velocity = self.movedir;
 201         tracetoss(e, e);
 202         self.dest = trace_endpos;
 203         remove(e);
 204
 205         waypoint_spawnforteleporter(self, self.dest, flighttime);
 206 };
 207
 208 /*
 209  * ENTITY PARAMETERS:
 210  *
 211  *   target:  target of jump
 212  *   height:  the absolute value is the height of the highest point of the jump
 213  *            trajectory above the higher one of the player and the target.
 214  *            the sign indicates whether the highest point is INSIDE (positive)
 215  *            or OUTSIDE (negative) of the jump trajectory. General rule: use
 216  *            positive values for targets mounted on the floor, and use negative
 217  *            values to target a point on the ceiling.
 218  *   movedir: if target is not set, this * speed * 10 is the velocity to be reached.
 219  */
 220 void() trigger_push =
 221 {
 222         if (self.angles != '0 0 0')
 223                 SetMovedir ();
 224
 225         self.solid = SOLID_TRIGGER;
 226         setmodel (self, self.model); // no precision needed
 227         self.movetype = MOVETYPE_NONE;
 228         self.modelindex = 0;
 229         self.model = "";
 230
 231         self.touch = trigger_push_touch;
 232
 233         // normal push setup
 234         if (!self.speed)
 235                 self.speed = 1000;
 236         self.movedir = self.movedir * self.speed * 10;
 237
 238         // this must be called to spawn the teleport waypoints for bots
 239         self.think = trigger_push_findtarget;
 240         self.nextthink = time + 0.2;
 241 };
 242
 243 void() target_push = {};
 244 void() info_notnull = {};
 245 void() target_position = {};