From 9623feb8667b9aa5a47343a13d5b9acb2312cbf8 Mon Sep 17 00:00:00 2001
From: Stijn Buys <ingar@osirion.org>
Date: Wed, 24 Nov 2010 20:13:56 +0000
Subject: Exposed ship physics damping factors through ships.ini and the specs
 command.

---
 src/game/base/game.cc      |  8 ++++++++
 src/game/base/ship.cc      |  5 +----
 src/game/base/shipmodel.cc | 16 ++++++++++++++++
 src/game/base/shipmodel.h  | 29 ++++++++++++++++++++++++++++-
 4 files changed, 53 insertions(+), 5 deletions(-)

(limited to 'src/game')

diff --git a/src/game/base/game.cc b/src/game/base/game.cc
index c171711..7ed01e1 100644
--- a/src/game/base/game.cc
+++ b/src/game/base/game.cc
@@ -461,6 +461,7 @@ void Game::func_specs(core::Player *player, const std::string &args)
 		con_print << "  ^Nradius  = ^B" << ship->radius() << std::endl;
 		con_print << "  ^Ncargo   = ^B" << ship->inventory()->capacity() << std::endl;
 		con_print << "Engines:"  << std::endl;
+		con_print << "  ^Ndamping = ^B" << ship->body()->getLinearDamping() << " " << ship->body()->getAngularDamping() << std::endl;
 		con_print << "  ^Nthrust  = ^B" << ship->thrust_force() << std::endl;
 		con_print << "  ^Nimpulse = ^B" << ship->impulse_force() << std::endl;
 		con_print << "  ^Nstrafe  = ^B" << ship->strafe_force() << std::endl;
@@ -502,6 +503,13 @@ void Game::func_specs(core::Player *player, const std::string &args)
 		} else if (str.compare("roll") == 0) {
 			ship->set_roll_force(value);
 			msgstr << "Ship roll force set to " << value;
+		
+		} else if (str.compare("damping") == 0) {
+			float a;
+			if (!(is >> a)) {
+				a = value;
+			}
+			ship->body()->setDamping(value, a);
 			
 		} else {
 			msgstr << "^WUnknown ship engine specification '" << str << "'";
diff --git a/src/game/base/ship.cc b/src/game/base/ship.cc
index 40b7812..86a467b 100644
--- a/src/game/base/ship.cc
+++ b/src/game/base/ship.cc
@@ -92,9 +92,7 @@ Ship::Ship(core::Player *owner, const ShipModel *shipmodel) : core::EntityContro
 	// initialize physics
 	reset();
 	
-	const float linear_damp = 0.8f;
-	const float angular_damp = 0.8f;
-	body()->setDamping(linear_damp, angular_damp);
+	body()->setDamping(ship_shipmodel->linear_damping(), ship_shipmodel->angular_damping());
 }
 
 Ship::~Ship()
@@ -370,7 +368,6 @@ void Ship::frame(float seconds)
 
 	math::Vector3f n;				// normal of a plane	
 	math::Axis target_axis(axis());			// target axis
-	entity_movement = 0;
 
 	/* -- update state ----------------------------------------- */
 
diff --git a/src/game/base/shipmodel.cc b/src/game/base/shipmodel.cc
index 4d5db69..126557c 100644
--- a/src/game/base/shipmodel.cc
+++ b/src/game/base/shipmodel.cc
@@ -116,6 +116,20 @@ bool ShipModel::init()
 				} else if (inifile.got_key_float("radius", f)) {
 					shipmodel->set_radius(f);
 					continue;
+				} else if (inifile.got_key_string("damping", str)) {
+					float linear, angular;
+					std::istringstream sstr("str");
+					if (sstr >> linear) {
+						if (sstr >> angular) {
+							shipmodel->set_linear_damping(linear);
+							shipmodel->set_angular_damping(angular);
+						} else {
+							shipmodel->set_linear_damping(linear);
+							shipmodel->set_angular_damping(linear);
+						}
+					} else {
+						inifile.unknown_value();
+					}
 				} else if (inifile.got_key_label("template", str)) {
 					Template *entitytemplate = Template::find(str);
 					if (!entitytemplate) {
@@ -184,6 +198,8 @@ ShipModel::ShipModel() : core::Info(shipmodel_infotype)
 	//default specifications
 	shipmodel_radius = 0.0f;
 	shipmodel_mass = 0.0f;
+	shipmodel_linear_damping = 0.8f;
+	shipmodel_angular_damping = 0.8f;
 	
 	shipmodel_thrust_force = 0.8f;
 	shipmodel_impulse_force = 4.0f;
diff --git a/src/game/base/shipmodel.h b/src/game/base/shipmodel.h
index bbb5798..f790bcd 100644
--- a/src/game/base/shipmodel.h
+++ b/src/game/base/shipmodel.h
@@ -70,6 +70,16 @@ public:
 		return shipmodel_roll_force;
 	}
 
+	/// linear damping factor
+	inline const float linear_damping() const {
+		return shipmodel_linear_damping;
+	}
+	
+	/// angular damping factor
+	inline const float angular_damping() const {
+		return shipmodel_angular_damping;
+	}
+	
 	/// maximum thrust speed
 	inline const float maxspeed() const {
 		return shipmodel_maxspeed;
@@ -127,7 +137,7 @@ protected:
 		shipmodel_strafe_force = strafe;
 	}
 	
-	/// set turn force
+	/// set turn forceshipmodel_lineardamping
 	inline void set_turn_force(const float turn) {
 		shipmodel_turn_force = turn;
 	}
@@ -167,6 +177,20 @@ protected:
 		shipmodel_template = model_template;
 	}
 
+	/**
+	 * @brief set physics linear damping factor
+	 */
+	inline void set_linear_damping(const float linear_damping) {
+		shipmodel_linear_damping = linear_damping;
+	}
+	
+	/**
+	 * @brief set physics linear damping factor
+	 */
+	inline void set_angular_damping(const float angular_damping) {
+		shipmodel_angular_damping = angular_damping;
+	}
+	
 public:
 	void generate_info();
 	
@@ -193,6 +217,9 @@ private:
 	
 	float 			shipmodel_radius;
 	float 			shipmodel_mass;
+	float			shipmodel_linear_damping;
+	float			shipmodel_angular_damping;
+	
 	float			shipmodel_impulse_force;
 	float			shipmodel_thrust_force;
 	float			shipmodel_strafe_force;
-- 
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