1 files changed, 148 insertions, 0 deletions
diff --git a/src/game/base/npc.cc b/src/game/base/npc.cc
new file mode 100644
index 0000000..2cd193b
--- /dev/null
+++ b/src/game/base/npc.cc
@@ -0,0 +1,148 @@
+/*
+   base/npc.cc
+   This file is part of the Osirion project and is distributed under
+   the terms of the GNU General Public License version 2
+*/
+
+#include "base/npc.h"
+#include "base/game.h"
+
+namespace game {
+	
+// NPC Wingman factory function
+NPC *NPC::add_wingman(Ship *leader)
+{
+	if (!leader) {
+		return 0;
+	}
+	
+	if (leader->state() != Entity::Normal) {
+		return 0;
+	}
+
+	NPC *npc = new NPC(ProfileWingman, leader->shipmodel());
+	
+	npc->set_leader(leader);
+	npc->set_owner(leader->owner());
+	npc->set_name("Wingman");
+	npc->set_mood(MoodFormation);
+	
+	npc->set_color(npc->leader()->color());
+	npc->set_color_second(npc->leader()->color_second());
+	
+	npc->set_location(leader->location() - leader->axis().forward() *  2.0f * (leader->radius() + npc->radius()));
+	
+	npc->set_axis(leader->axis());
+	npc->set_zone(leader->zone());
+	
+	npc->reset();
+	
+	return npc;
+}
+	
+NPC::NPC(const Profile profile, const ShipModel *shipmodel) : Ship(0, shipmodel)
+{
+	npc_profile = profile;
+	npc_mood = MoodWander;
+	npc_destroyed_timestamp = 0;
+}
+
+void NPC::set_mood(const Mood mood)
+{
+	npc_mood = mood;
+}
+
+void NPC::set_leader(Ship *leader)
+{
+	npc_leader = leader;
+}
+
+void NPC::frame(const unsigned long elapsed)
+{
+	if (state() == core::Entity::Destroyed) {
+		
+		if (!npc_destroyed_timestamp) {
+			npc_destroyed_timestamp = core::game()->time();
+			
+		} else if (npc_destroyed_timestamp + 10.0f < core::game()->time()) {
+		// stay alive for 10 more seconds while explosion particles are drawn
+		
+			die();
+		}
+
+	} else {
+	
+		// FIXME verify the leader is still alive
+		
+		// TODO pilot magic and mood witchcraft
+		
+		if (leader()) {
+			
+			// verify leader still exists
+			if (!core::Entity::find(leader())) {
+				
+				set_leader(0);
+				explode();
+				npc_destroyed_timestamp = core::game()->time();
+			
+			} else if (leader()->zone() == zone()) {
+				
+				// rotate towards leader: direction
+				math::Vector3f d(leader()->location() - location());
+				float distance = d.length();
+				
+				d.normalize();
+				
+				float direction_angle = math::dotproduct(axis().forward(), d);
+				float direction_sign = math::sgnf(math::dotproduct(axis().left(), d));
+				
+				if (direction_sign < 0 ) {
+					target_direction = direction_sign;
+				} else if (direction_angle + MIN_DELTA < 1.0f ) {
+					target_direction = direction_sign * direction_angle;
+				} else {
+					target_direction = 0.0f;
+				}
+				
+				// rotate towards leader: pitch
+				direction_angle = math::dotproduct(axis().forward(), d);
+				direction_sign = math::sgnf(math::dotproduct(axis().up(), d));
+				
+				if (direction_sign < 0 ) {
+					target_pitch = direction_sign;
+				} else if (direction_angle + MIN_DELTA < 1.0f ) {
+					target_pitch = direction_sign * direction_angle;
+				} else {
+					target_pitch = 0.0f;
+				}
+				
+				const float r =  2.0f * (radius() + leader()->radius());
+				
+				if (distance > 2.0f * r) {
+					target_thrust = 1.0f;
+				} else if (distance > r) {
+					target_thrust = (distance - r ) / r;
+				} else {
+					target_thrust = 0.0f;
+				}
+				
+			} else {
+				
+				target_direction = 0;
+				target_pitch = 0;
+				target_roll = 0;
+				target_strafe = 0.0f;
+				target_vstrafe = 0.0f;
+				
+				target_afterburner = 0.0f;
+				target_thrust = 0;
+			}
+		}
+	}
+	
+	// run a ship game frame
+	Ship::frame(elapsed);
+}
+
+} // namespace game
+