[Add] Smart seeker missiles. Not aquirable yet :P.

[Fix] Potential fix of a floating point exceoption.

dat/outfit.xml

@@ -55,4 +55,38 @@
       </damage>
     </specific>
   </outfit>
+ <outfit name="Headhunter Launcer">
+		<general>
+			<max>2</max>
+			<tech>8</tech>
+      <mass>12</mass>
+			<price>40000</price>
+		</general>
+    <specific type="5" secondary="1">
+      <ammo>Headhunter</ammo>
+      <delay>1400</delay>
+    </specific>
+  </outfit>
+  <outfit name="Headhunter">
+		<general>
+			<max>40</max>
+			<tech>4</tech>
+      <mass>1</mass>
+			<price>2000</price>
+		</general>
+    <specific type="6">
+      <gfx>missile</gfx>
+			<sound>missile</sound>
+			<spfx>ExpM</spfx>
+      <duration>7</duration>
+			<lockon>0.5</lockon>
+      <thrust>1200</thrust>
+      <turn>200</turn>
+      <speed>600</speed>
+      <damage>
+        <armour>23</armour>
+        <shield>18</shield>
+      </damage>
+    </specific>
+  </outfit>
 </Outfits>

src/physics.c

@@ -14,7 +14,12 @@ double angle_diff(const double ref, double a) {
   return (d <= M_PI) ? d : d - 2*M_PI;
 }
 
-void limit_speed(Vec2* vel, const double speed, const double dt) {
+void limit_speed(Vec2* vel, const double speed) {
+	if(VMOD(*vel) > speed) // Should not go faster.
+		vect_pset(vel, speed, VANGLE(*vel));
+}
+
+void limit_speeddt(Vec2* vel, const double speed, const double dt) {
 	double vmod;
 	vmod = VMOD(*vel);
 	if(vmod > speed) // Should not go faster.

src/physics.h

@@ -22,7 +22,8 @@ typedef struct Vec2_ {
 
 // Misc
 double angle_diff(const double ref, double a);
-void limit_speed(Vec2* vel, const double speed, const double dt);
+void limit_speed(Vec2* vel, const double speed);
+void limit_speeddt(Vec2* vel, const double speed, const double dt);
 
 // Vector manupulation.
 void vect_cset(Vec2* v, const double x, const double y);

src/pilot.c

@@ -172,7 +172,7 @@ static void pilot_shootWeapon(Pilot* p, PilotOutfit* w, const unsigned int t) {
     }
   }
   // Missile launchers.
-  // Must be secondary weapon, Shootee can't be the target.
+  // Must be secondary weapon, Shooter can't be the target.
   else if(outfit_isLauncher(w->outfit) && (w == p->secondary) && (p->id != t)) {
     if(p->ammo && (p->ammo->quantity > 0)) {
       weapon_add(p->ammo->outfit, p->solid->dir, &p->solid->pos, &p->solid->vel, p->id, t);
@@ -329,7 +329,7 @@ static void pilot_update(Pilot* pilot, const double dt) {
   
   if(!pilot_isFlag(pilot, PILOT_HYPERSPACE))
     // Should not go faster.
-		limit_speed(&pilot->solid->vel, pilot->ship->speed, dt);
+		limit_speeddt(&pilot->solid->vel, pilot->ship->speed, dt);
 }
 
 // Pilot is getting ready or is in, hyperspace.

src/weapon.c

@@ -113,14 +113,14 @@ void weapons_delay(unsigned int delay) {
 		wfrontLayer[i]->timer += delay;
 }
 
+// Seeker brain, You get what you pay for. :)
 static void think_seeker(Weapon* w) {
 	double diff;
   if(w->target == w->parent) return; // HEY! Self harm is not allowed.
 
   Pilot* p = pilot_get(w->target);
   if(p == NULL) {
-		if(VMOD(w->solid->vel) > w->outfit->u.amm.speed) // Should not go faster.
+		limit_speed(&w->solid->vel, w->outfit->u.amm.speed);
-			vect_pset(&w->solid->vel, w->outfit->u.amm.speed, VANGLE(w->solid->vel));
 		return;
 	}
 
@@ -134,10 +134,41 @@ static void think_seeker(Weapon* w) {
 	}
 
   vect_pset(&w->solid->force, w->outfit->u.amm.thrust, w->solid->dir);
+	
+	limit_speed(&w->solid->vel, w->outfit->u.amm.speed);
+}
+
+// Smart seeker brain. Much better at homing.
+static void think_smart(Weapon* w) {
+	double diff;
+	Vec2 tv, sv;
+
+	if(w->target == w->parent) return; // No self shooting here.
+
+	Pilot* p = pilot_get(w->target); // No null pilots..
+
+	if(p == NULL) {
+		limit_speed(&w->solid->vel, w->outfit->u.amm.speed);
+		return;
+	}
+
+	if(SDL_GetTicks() > (w->timer + w->outfit->u.amm.lockon)) {
+		vect_cset(&tv, VX(p->solid->pos) + VX(p->solid->vel),
+					VY(p->solid->pos) + VY(p->solid->vel));
+		vect_cset(&sv, VX(w->solid->pos) + VX(w->solid->vel),
+					VY(w->solid->pos) + VY(w->solid->vel));
+		diff = angle_diff(w->solid->dir, vect_angle(&tv, &sv));
+		w->solid->dir_vel = 10*diff*w->outfit->u.amm.turn; // Face the target.
+		if(w->solid->dir_vel > w->outfit->u.amm.turn)
+			w->solid->dir_vel = w->outfit->u.amm.turn;
+		else if(w->solid->dir_vel < -w->outfit->u.amm.turn)
+			w->solid->dir_vel = -w->outfit->u.amm.turn;
+	}
+
+	vect_pset(&w->solid->force, w->outfit->u.amm.thrust, w->solid->dir);
+
+	limit_speed(&w->solid->vel, w->outfit->u.amm.speed);
 
-  if(VMOD(w->solid->vel) > w->outfit->u.amm.speed)
-    // We should not go any faster.
-    vect_pset(&w->solid->vel, w->outfit->u.amm.speed, VANGLE(w->solid->vel));
 }
 
 // Update all the weapon layers.
@@ -166,7 +197,11 @@ static void weapons_updateLayer(const double dt, const WeaponLayer layer) {
   for(i = 0; i < (*nlayer); i++) {
     w = wlayer[i];
     switch(wlayer[i]->outfit->type) {
+			// Most missiles behave the same.
       case OUTFIT_TYPE_MISSILE_SEEK_AMMO:
+			case OUTFIT_TYPE_MISSILE_SEEK_SMART_AMMO:
+			case OUTFIT_TYPE_MISSILE_SWARM_AMMO:
+			case OUTFIT_TYPE_MISSILE_SWARM_SMART_AMMO:
         if(SDL_GetTicks() > (wlayer[i]->timer + wlayer[i]->outfit->u.amm.duration)) {
           weapon_destroy(wlayer[i], layer);
           continue;
@@ -302,6 +337,7 @@ static Weapon* weapon_create(const Outfit* outfit, const double dir, const Vec2*
       if((rdir > 2.*M_PI) || (rdir < 0.)) rdir = fmod(rdir, 2.*M_PI);
       vectcpy(&v, vel);
       vect_cadd(&v, outfit->u.wpn.speed*cos(rdir), outfit->u.wpn.speed*sin(rdir));
+			w->timer += 1000*(unsigned int)outfit->u.wpn.range/outfit->u.wpn.speed;
       w->solid = solid_create(mass, rdir, pos, &v);
 			w->voice = sound_addVoice(VOICE_PRIORITY_BOLT,
 						w->solid->pos.x, w->solid->pos.y,
@@ -314,8 +350,15 @@ static Weapon* weapon_create(const Outfit* outfit, const double dir, const Vec2*
 			w->voice = sound_addVoice(VOICE_PRIORITY_AMMO,
 						w->solid->pos.x, w->solid->pos.y,
 						w->solid->vel.x, w->solid->vel.y, w->outfit->u.amm.sound, 0);
-
       break;
+		case OUTFIT_TYPE_MISSILE_SEEK_SMART_AMMO:
+			mass = w->outfit->mass;
+			w->solid = solid_create(mass, dir, pos, vel);
+			w->think = think_smart; // Smartass.
+			w->voice = sound_addVoice(VOICE_PRIORITY_AMMO,
+						w->solid->pos.x, w->solid->pos.y,
+						w->solid->vel.x, w->solid->vel.y, w->outfit->u.amm.sound, 0);
+			break;
     default:
       // Just dump it where the player is.
 			w->voice = NULL;