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;
  29         if(tgt.model)
  30                 torg = torg + (tgt.mins + tgt.maxs) * 0.5;
  31
  32         grav = cvar("sv_gravity");
  33
  34         zdist = torg_z - org_z;
  35         sdist = vlen(torg - org - zdist * '0 0 1');
  36         sdir = normalize(torg - org - zdist * '0 0 1');
  37
  38         // how high do we need to push the player?
  39         jumpheight = fabs(ht);
  40         if(zdist > 0)
  41                 jumpheight = jumpheight + zdist;
  42
  43         /*
  44                 STOP.
  45
  46                 You will not understand the following equations anyway...
  47                 But here is what I did to get them.
  48
  49                 I used the functions
  50
  51                   s(t) = t * vs
  52                   z(t) = t * vz - 1/2 grav t^2
  53
  54                 and solved for:
  55
  56                   s(ti) = sdist
  57                   z(ti) = zdist
  58                   max(z, ti) = jumpheight
  59
  60                 From these three equations, you will find the three parameters vs, vz
  61                 and ti.
  62          */
  63
  64         // push him so high...
  65         vz = sqrt(2 * grav * jumpheight); // NOTE: sqrt(positive)!
  66         if(ht < 0)
  67                 if(zdist < 0)
  68                         vz = -vz;
  69
  70         // how far to push him?
  71         if(zdist == 0)
  72         {
  73                 trigger_push_calculatevelocity_flighttime = sqrt(jumpheight * 8 / grav);
  74                 vs = sdist / trigger_push_calculatevelocity_flighttime;
  75                         // trajsign is ignored (the high point MUST be inside the jump!)
  76         }
  77         else
  78         {
  79                 if(ht > 0)
  80                         trajsign = +1;
  81                 else
  82                         trajsign = -1;
  83
  84                 // >0: the lower speed that achieves "it"
  85                 //     (parabola's maximum inside the jump)
  86                 // <0: the higher speed that achieves "it"
  87                 //     (parabola's maximum outside the jump)
  88
  89                 vs = sqrt(jumpheight - zdist);
  90                 vs = sqrt(jumpheight) - trajsign * vs; // fteqcc sucks
  91                 vs = fabs(vs * sqrt(grav/2) / zdist);
  92                 //vs = fabs((sdist / zdist) * sqrt(grav/2) * (sqrt(jumpheight) - trajsign * sqrt(jumpheight - zdist)));
  93                 trigger_push_calculatevelocity_flighttime = 1 / vs;
  94                         // note: vs cannot be zero here. The difference between the sqrts is zero IFF zdist == 0, which we have excluded.
  95                 vs = vs * sdist;
  96
  97                 // cases to test: "jump up", "jump down" with positive and negative height
  98         }
  99
 100         // finally calculate the velocity
 101         return sdir * vs + '0 0 1' * vz;
 102 }
 103
 104 void() trigger_push_touch =
 105 {
 106         // FIXME: add a .float for whether an entity should be tossed by jumppads
 107         if (other.classname != "player")
 108         if (other.classname != "corpse")
 109         if (other.classname != "body")
 110         if (other.classname != "gib")
 111         if (other.classname != "missile")
 112         if (other.classname != "casing")
 113         if (other.classname != "grenade")
 114         if (other.classname != "plasma")
 115         if (other.classname != "plasma_prim")
 116         if (other.classname != "plasma_chain")
 117         if (other.classname != "droppedweapon")
 118                 return;
 119
 120         if (other.deadflag && other.classname == "player")
 121                 return;
 122
 123         if (!self.target)
 124         {
 125                 other.velocity = self.movedir;
 126                 other.flags = other.flags - (other.flags & FL_ONGROUND);
 127                 return;
 128         }
 129
 130         if (other.classname == "player")
 131         {
 132                 local float i;
 133                 local float found;
 134                 if(self.pushltime < time)  // prevent "snorring" sound when a player hits the jumppad more than once
 135                 {
 136                         sound (other, CHAN_ITEM, "misc/jumppad.ogg", 1, ATTN_NORM);
 137                         self.pushltime = time + 0.5;
 138                 }
 139                 found = FALSE;
 140                 for(i = 0; i < other.jumppadcount && i < NUM_JUMPPADSUSED; ++i)
 141                         if(other.(jumppadsused[i]) == self)
 142                                 found = TRUE;
 143                 if(!found)
 144                 {
 145                         other.(jumppadsused[math_mod(other.jumppadcount, NUM_JUMPPADSUSED)]) = self;
 146                         other.jumppadcount = other.jumppadcount + 1;
 147                 }
 148         }
 149
 150         self.movedir = trigger_push_calculatevelocity(other.origin, self.enemy, self.height);
 151
 152         other.flags = other.flags - (other.flags & FL_ONGROUND);
 153         // reset tracking of oldvelocity for impact damage (sudden velocity changes)
 154         other.oldvelocity = other.velocity = self.movedir;
 155         // reset tracking of who pushed you into a hazard (for kill credit)
 156         other.pushltime = 0;
 157
 158         if (other.classname == "missile")
 159                 other.angles = vectoangles (other.velocity);
 160
 161         if (self.spawnflags & PUSH_ONCE)
 162         {
 163                 self.touch = SUB_Null;
 164                 self.think = SUB_Remove;
 165                 self.nextthink = time;
 166         }
 167 };
 168
 169 .vector dest;
 170
 171 void() trigger_push_findtarget =
 172 {
 173         local entity e;
 174         local vector org;
 175         local float flighttime;
 176
 177         // first calculate a typical start point for the jump
 178         org = (self.absmin + self.absmax) * 0.5;
 179         org_z = self.absmax_z - PL_MIN_z;
 180
 181         if (self.target)
 182         {
 183                 // find the target
 184                 self.enemy = find(world, targetname, self.target);
 185                 if (!self.enemy)
 186                 {
 187                         objerror("trigger_push: target not found\n");
 188                         remove(self);
 189                         return;
 190                 }
 191
 192                 self.movedir = trigger_push_calculatevelocity(org, self.enemy, self.height);
 193                 flighttime = trigger_push_calculatevelocity_flighttime;
 194         }
 195         else
 196                 flighttime = 0;
 197
 198         // calculate the destination and spawn a teleporter waypoint
 199         e = spawn();
 200         setorigin(e, org);
 201         setsize(e, PL_MIN, PL_MAX);
 202         e.velocity = self.movedir;
 203         tracetoss(e, e);
 204         self.dest = trace_endpos;
 205         remove(e);
 206
 207         waypoint_spawnforteleporter(self, self.dest, flighttime);
 208 };
 209
 210 /*
 211  * ENTITY PARAMETERS:
 212  *
 213  *   target:  target of jump
 214  *   height:  the absolute value is the height of the highest point of the jump
 215  *            trajectory above the higher one of the player and the target.
 216  *            the sign indicates whether the highest point is INSIDE (positive)
 217  *            or OUTSIDE (negative) of the jump trajectory. General rule: use
 218  *            positive values for targets mounted on the floor, and use negative
 219  *            values to target a point on the ceiling.
 220  *   movedir: if target is not set, this * speed * 10 is the velocity to be reached.
 221  */
 222 void() trigger_push =
 223 {
 224         if (self.angles != '0 0 0')
 225                 SetMovedir ();
 226
 227         self.solid = SOLID_TRIGGER;
 228         setmodel (self, self.model);
 229         self.movetype = MOVETYPE_NONE;
 230         self.modelindex = 0;
 231         self.model = "";
 232
 233         self.touch = trigger_push_touch;
 234
 235         // normal push setup
 236         if (!self.speed)
 237                 self.speed = 1000;
 238         self.movedir = self.movedir * self.speed * 10;
 239
 240         // this must be called to spawn the teleport waypoints for bots
 241         self.think = trigger_push_findtarget;
 242         self.nextthink = time + 0.2;
 243 };
 244
 245 void() target_push = {};
 246 void() info_notnull = {};
 247 void() target_position = {};