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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);
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 = {};