Switched get/setMeter from being a World method to a love.physics function

--HG--
branch : box2d-update

src/modules/physics/box2d/Body.cpp

@@ -23,6 +23,7 @@
 #include <common/math.h>
 
 #include "World.h"
+#include "Physics.h"
 
 namespace love
 {
@@ -35,7 +36,7 @@ namespace box2d
 	{
 		world->retain();
 		b2BodyDef def;
-		def.position = world->scaleDown(p);
+		def.position = Physics::scaleDown(p);
 		def.massData.mass = m;
 		def.massData.I = i;
 		body = world->world->CreateBody(&def);
@@ -50,24 +51,24 @@ namespace box2d
 
 	float Body::getX()
 	{
-		return world->scaleUp(body->GetPosition().x);
+		return Physics::scaleUp(body->GetPosition().x);
 	}
 
 	float Body::getY()
 	{
-		return world->scaleUp(body->GetPosition().y);
+		return Physics::scaleUp(body->GetPosition().y);
 	}
 
 	void Body::getPosition(float & x_o, float & y_o)
 	{
-		b2Vec2 v = world->scaleUp(body->GetPosition());
+		b2Vec2 v = Physics::scaleUp(body->GetPosition());
 		x_o = v.x;
 		y_o = v.y;
 	}
 
 	void Body::getLinearVelocity(float & x_o, float & y_o)
 	{
-		b2Vec2 v = world->scaleUp(body->GetLinearVelocity());
+		b2Vec2 v = Physics::scaleUp(body->GetLinearVelocity());
 		x_o = v.x;
 		y_o = v.y;
 	}
@@ -79,14 +80,14 @@ namespace box2d
 
 	void Body::getWorldCenter(float & x_o, float & y_o)
 	{
-		b2Vec2 v = world->scaleUp(body->GetWorldCenter());
+		b2Vec2 v = Physics::scaleUp(body->GetWorldCenter());
 		x_o = v.x;
 		y_o = v.y;
 	}
 
 	void Body::getLocalCenter(float & x_o, float & y_o)
 	{
-		b2Vec2 v = world->scaleUp(body->GetLocalCenter());
+		b2Vec2 v = Physics::scaleUp(body->GetLocalCenter());
 		x_o = v.x;
 		y_o = v.y;
 	}
@@ -123,7 +124,7 @@ namespace box2d
 
 	void Body::applyImpulse(float jx, float jy, float rx, float ry)
 	{
-		body->ApplyImpulse(b2Vec2(jx, jy), world->scaleDown(b2Vec2(rx, ry)));
+		body->ApplyImpulse(b2Vec2(jx, jy), Physics::scaleDown(b2Vec2(rx, ry)));
 	}
 
 	void Body::applyTorque(float t)
@@ -133,7 +134,7 @@ namespace box2d
 
 	void Body::applyForce(float fx, float fy, float rx, float ry)
 	{
-		body->ApplyForce(b2Vec2(fx, fy), world->scaleDown(b2Vec2(rx, ry)));
+		body->ApplyForce(b2Vec2(fx, fy), Physics::scaleDown(b2Vec2(rx, ry)));
 	}
 
 	void Body::applyForce(float fx, float fy)
@@ -143,17 +144,17 @@ namespace box2d
 
 	void Body::setX(float x)
 	{
-		body->SetXForm(world->scaleDown(b2Vec2(x, getY())), getAngle());
+		body->SetXForm(Physics::scaleDown(b2Vec2(x, getY())), getAngle());
 	}
 
 	void Body::setY(float y)
 	{
-		body->SetXForm(world->scaleDown(b2Vec2(getX(), y)), getAngle());
+		body->SetXForm(Physics::scaleDown(b2Vec2(getX(), y)), getAngle());
 	}
 
 	void Body::setLinearVelocity(float x, float y)
 	{
-		body->SetLinearVelocity(world->scaleDown(b2Vec2(x, y)));
+		body->SetLinearVelocity(Physics::scaleDown(b2Vec2(x, y)));
 	}
 
 	void Body::setAngle(float d)
@@ -168,7 +169,7 @@ namespace box2d
 
 	void Body::setPosition(float x, float y)
 	{
-		body->SetXForm(world->scaleDown(b2Vec2(x, y)), body->GetAngle());
+		body->SetXForm(Physics::scaleDown(b2Vec2(x, y)), body->GetAngle());
 	}
 
 	void Body::setAngularDamping(float d)
@@ -189,7 +190,7 @@ namespace box2d
 	void Body::setMass(float x, float y, float m, float i)
 	{
 		b2MassData massData;
-		massData.center = world->scaleDown(b2Vec2(x, y));
+		massData.center = Physics::scaleDown(b2Vec2(x, y));
 		massData.mass = m;
 		massData.I = i;
 		body->SetMass(&massData);
@@ -206,42 +207,42 @@ namespace box2d
 
 	void Body::getWorldPoint(float x, float y, float & x_o, float & y_o)
 	{
-		b2Vec2 v = world->scaleUp(body->GetWorldPoint(world->scaleDown(b2Vec2(x, y))));
+		b2Vec2 v = Physics::scaleUp(body->GetWorldPoint(Physics::scaleDown(b2Vec2(x, y))));
 		x_o = v.x;
 		y_o = v.y;
 	}
 
 	void Body::getWorldVector(float x, float y, float & x_o, float & y_o)
 	{
-		b2Vec2 v = world->scaleUp(body->GetWorldVector(world->scaleDown(b2Vec2(x, y))));
+		b2Vec2 v = Physics::scaleUp(body->GetWorldVector(Physics::scaleDown(b2Vec2(x, y))));
 		x_o = v.x;
 		y_o = v.y;
 	}
 
 	void Body::getLocalPoint(float x, float y, float & x_o, float & y_o)
 	{
-		b2Vec2 v = world->scaleUp(body->GetLocalPoint(world->scaleDown(b2Vec2(x, y))));
+		b2Vec2 v = Physics::scaleUp(body->GetLocalPoint(Physics::scaleDown(b2Vec2(x, y))));
 		x_o = v.x;
 		y_o = v.y;
 	}
 
 	void Body::getLocalVector(float x, float y, float & x_o, float & y_o)
 	{
-		b2Vec2 v = world->scaleUp(body->GetLocalVector(world->scaleDown(b2Vec2(x, y))));
+		b2Vec2 v = Physics::scaleUp(body->GetLocalVector(Physics::scaleDown(b2Vec2(x, y))));
 		x_o = v.x;
 		y_o = v.y;
 	}
 
 	void Body::getLinearVelocityFromWorldPoint(float x, float y, float & x_o, float & y_o)
 	{
-		b2Vec2 v = world->scaleUp(body->GetLinearVelocityFromWorldPoint(world->scaleDown(b2Vec2(x, y))));
+		b2Vec2 v = Physics::scaleUp(body->GetLinearVelocityFromWorldPoint(Physics::scaleDown(b2Vec2(x, y))));
 		x_o = v.x;
 		y_o = v.y;
 	}
 
 	void Body::getLinearVelocityFromLocalPoint(float x, float y, float & x_o, float & y_o)
 	{
-		b2Vec2 v = world->scaleUp(body->GetLinearVelocityFromLocalPoint(world->scaleDown(b2Vec2(x, y))));
+		b2Vec2 v = Physics::scaleUp(body->GetLinearVelocityFromLocalPoint(Physics::scaleDown(b2Vec2(x, y))));
 		x_o = v.x;
 		y_o = v.y;
 	}

src/modules/physics/box2d/Contact.cpp

@@ -20,6 +20,7 @@
 
 #include "Contact.h"
 #include "World.h"
+#include "Physics.h"
 
 namespace love
 {
@@ -41,30 +42,30 @@ namespace box2d
 	int Contact::getPosition(lua_State * L)
 	{
 		love::luax_assert_argc(L, 1, 1);
-		lua_pushnumber(L, world->scaleUp(point.position.x));
-		lua_pushnumber(L, world->scaleUp(point.position.y));
+		lua_pushnumber(L, Physics::scaleUp(point.position.x));
+		lua_pushnumber(L, Physics::scaleUp(point.position.y));
 		return 2;
 	}
 
 	int Contact::getVelocity(lua_State * L)
 	{
 		love::luax_assert_argc(L, 1, 1);
-		lua_pushnumber(L, world->scaleUp(point.velocity.x));
-		lua_pushnumber(L, world->scaleUp(point.velocity.y));
+		lua_pushnumber(L, Physics::scaleUp(point.velocity.x));
+		lua_pushnumber(L, Physics::scaleUp(point.velocity.y));
 		return 2;
 	}
 
 	int Contact::getNormal(lua_State * L)
 	{
 		love::luax_assert_argc(L, 1, 1);
-		lua_pushnumber(L, world->scaleUp(point.normal.x));
-		lua_pushnumber(L, world->scaleUp(point.normal.y));
+		lua_pushnumber(L, Physics::scaleUp(point.normal.x));
+		lua_pushnumber(L, Physics::scaleUp(point.normal.y));
 		return 2;
 	}
 
 	float Contact::getSeparation() const
 	{
-		return world->scaleUp(point.separation);
+		return Physics::scaleUp(point.separation);
 	}
 
 	float Contact::getFriction() const

src/modules/physics/box2d/DistanceJoint.cpp

@@ -23,6 +23,7 @@
 // Module
 #include "Body.h"
 #include "World.h"
+#include "Physics.h"
 
 namespace love
 {
@@ -34,7 +35,7 @@ namespace box2d
 		: Joint(body1, body2), joint(NULL)
 	{
 		b2DistanceJointDef def;
-		def.Initialize(body1->body, body2->body, world->scaleDown(b2Vec2(x1,y1)), world->scaleDown(b2Vec2(x2,y2)));
+		def.Initialize(body1->body, body2->body, Physics::scaleDown(b2Vec2(x1,y1)), Physics::scaleDown(b2Vec2(x2,y2)));
 		def.collideConnected = collideConnected;
 		joint = (b2DistanceJoint*)createJoint(&def);
 	}
@@ -47,12 +48,12 @@ namespace box2d
 
 	void DistanceJoint::setLength(float length)
 	{
-		joint->SetLength(world->scaleDown(length));
+		joint->SetLength(Physics::scaleDown(length));
 	}
 
 	float DistanceJoint::getLength() const
 	{
-		return world->scaleUp(joint->GetLength());
+		return Physics::scaleUp(joint->GetLength());
 	}
 
 	void DistanceJoint::setFrequency(float hz)

src/modules/physics/box2d/FrictionJoint.cpp

@@ -25,6 +25,7 @@
 // Module
 #include "Body.h"
 #include "World.h"
+#include "Physics.h"
 
 namespace love
 {
@@ -36,7 +37,7 @@ namespace box2d
 		: Joint(body1, body2), joint(NULL)
 	{	
 		b2FrictionJointDef def;
-		def.Initialize(body1->body, body2->body, world->scaleDown(b2Vec2(x,y)));
+		def.Initialize(body1->body, body2->body, Physics::scaleDown(b2Vec2(x,y)));
 		def.collideConnected = collideConnected;
 		joint = (b2FrictionJoint*)createJoint(&def);
 	}

src/modules/physics/box2d/Joint.cpp

@@ -26,6 +26,7 @@
 // Module
 #include "Body.h"
 #include "World.h"
+#include "Physics.h"
 
 namespace love
 {
@@ -87,10 +88,10 @@ namespace box2d
 
 	int Joint::getAnchors(lua_State * L)
 	{
-		lua_pushnumber(L, world->scaleUp(joint->GetAnchorA().x));
-		lua_pushnumber(L, world->scaleUp(joint->GetAnchorA().y));
-		lua_pushnumber(L, world->scaleUp(joint->GetAnchorB().x));
-		lua_pushnumber(L, world->scaleUp(joint->GetAnchorB().y));
+		lua_pushnumber(L, Physics::scaleUp(joint->GetAnchorA().x));
+		lua_pushnumber(L, Physics::scaleUp(joint->GetAnchorA().y));
+		lua_pushnumber(L, Physics::scaleUp(joint->GetAnchorB().x));
+		lua_pushnumber(L, Physics::scaleUp(joint->GetAnchorB().y));
 		return 4;
 	}
 

src/modules/physics/box2d/MouseJoint.cpp

@@ -23,6 +23,7 @@
 // Module
 #include "Body.h"
 #include "World.h"
+#include "Physics.h"
 
 namespace love
 {
@@ -38,7 +39,7 @@ namespace box2d
 		def.bodyA = body1->world->getGroundBody();
 		def.bodyB = body1->body;
 		def.maxForce = 1000.0f * body1->body->GetMass();
-		def.target = body1->world->scaleDown(b2Vec2(x,y));
+		def.target = Physics::scaleDown(b2Vec2(x,y));
 		joint = (b2MouseJoint*)createJoint(&def);
 	}
 
@@ -50,13 +51,13 @@ namespace box2d
 
 	void MouseJoint::setTarget(float x, float y)
 	{
-		joint->SetTarget(world->scaleDown(b2Vec2(x, y)));
+		joint->SetTarget(Physics::scaleDown(b2Vec2(x, y)));
 	}
 
 	int MouseJoint::getTarget(lua_State * L)
 	{
-		lua_pushnumber(L, world->scaleUp(joint->GetTarget().x));
-		lua_pushnumber(L, world->scaleUp(joint->GetTarget().y));
+		lua_pushnumber(L, Physics::scaleUp(joint->GetTarget().x));
+		lua_pushnumber(L, Physics::scaleUp(joint->GetTarget().y));
 		return 2;
 	}
 

src/modules/physics/box2d/Physics.cpp

@@ -193,6 +193,70 @@ namespace box2d
 	{
 		return new RopeJoint(body1, body2, x1, y1, x2, y2, maxLength, collideConnected);
 	}
+	
+	
+	
+	void Physics::setMeter(int meter)
+	{
+		Physics::meter = meter;
+	}
+	
+	int Physics::getMeter()
+	{
+		return meter;
+	}
+	
+	void Physics::scaleDown(float & x, float & y)
+	{
+		x /= (float)meter;
+		y /= (float)meter;
+	}
+	
+	void Physics::scaleUp(float & x, float & y)
+	{
+		x *= (float)meter;
+		y *= (float)meter;
+	}
+	
+	float Physics::scaleDown(float f)
+	{
+		return f/(float)meter;
+	}
+	
+	float Physics::scaleUp(float f)
+	{
+		return f*(float)meter;
+	}
+	
+	b2Vec2 Physics::scaleDown(const b2Vec2 & v)
+	{
+		b2Vec2 t = v;
+		scaleDown(t.x, t.y);
+		return t;
+	}
+	
+	b2Vec2 Physics::scaleUp(const b2Vec2 & v)
+	{
+		b2Vec2 t = v;
+		scaleUp(t.x, t.y);
+		return t;
+	}
+	
+	b2AABB Physics::scaleDown(const b2AABB & aabb)
+	{
+		b2AABB t;
+		t.lowerBound = scaleDown(aabb.lowerBound);
+		t.upperBound = scaleDown(aabb.upperBound);
+		return t;
+	}
+	
+	b2AABB Physics::scaleUp(const b2AABB & aabb)
+	{
+		b2AABB t;
+		t.lowerBound = scaleUp(aabb.lowerBound);
+		t.upperBound = scaleUp(aabb.upperBound);
+		return t;
+	}
 
 } // box2d
 } // physics

src/modules/physics/box2d/Physics.h

@@ -50,6 +50,11 @@ namespace box2d
 {
 	class Physics : public Module
 	{
+	private:
+		
+		// The length of one meter in pixels.
+		static int meter;
+
 	public:
 
 		// Implements Module.
@@ -242,6 +247,74 @@ namespace box2d
 		* @param collideConnected Whether the connected bodies should collide with each other. Defaults to false.
 		**/
 		RopeJoint * newRopeJoint(Body * body1, Body * body2, float x1, float y1, float x2, float y2, float maxLength, bool collideConnected);
+		
+		/**
+		 * Sets the number of pixels in one meter.
+		 * @param pixels The number of pixels in one meter. (1m ~= 3.3ft).
+		 **/
+		static void setMeter(int meter);
+		
+		/**
+		 * Gets the number of pixels in one meter.
+		 * @param pixels The number of pixels in one meter. (1m ~= 3.3ft).
+		 **/
+		static int getMeter();
+		
+		/**
+		 * Scales a value down according to the current meter in pixels.
+		 * @param f The unscaled input value.
+		 **/
+		static float scaleDown(float f);
+		
+		/**
+		 * Scales a value up according to the current meter in pixels.
+		 * @param f The unscaled input value.
+		 **/
+		static float scaleUp(float f);
+		
+		/**
+		 * Scales a point down according to the current meter
+		 * in pixels, for instance x = x0/meter, y = x0/meter.
+		 * @param x The x-coordinate of the point to scale.
+		 * @param y The y-coordinate of the point to scale.
+		 **/
+		static void scaleDown(float & x, float & y);
+		
+		/**
+		 * Scales a point up according to the current meter
+		 * in pixels, for instance x = x0/meter, y = x0/meter.
+		 * @param x The x-coordinate of the point to scale.
+		 * @param y The y-coordinate of the point to scale.
+		 **/
+		static void scaleUp(float & x, float & y);
+		
+		/**
+		 * Scales a b2Vec2 down according to the current meter in pixels.
+		 * @param v The unscaled input vector.
+		 * @return The scaled vector.
+		 **/
+		static b2Vec2 scaleDown(const b2Vec2 & v);
+		
+		/**
+		 * Scales a b2Vec up according to the current meter in pixels.
+		 * @param v The unscaled input vector.
+		 * @return The scaled vector.
+		 **/
+		static b2Vec2 scaleUp(const b2Vec2 & v);
+		
+		/**
+		 * Scales a b2AABB down according to the current meter in pixels.
+		 * @param v The unscaled input AABB.
+		 * @return The scaled AABB.
+		 **/
+		static b2AABB scaleDown(const b2AABB & aabb);
+		
+		/**
+		 * Scales a b2AABB up according to the current meter in pixels.
+		 * @param v The unscaled input AABB.
+		 * @return The scaled AABB.
+		 **/
+		static b2AABB scaleUp(const b2AABB & aabb);
 
 
 	}; // Physics

src/modules/physics/box2d/PrismaticJoint.cpp

@@ -23,6 +23,7 @@
 // Module
 #include "Body.h"
 #include "World.h"
+#include "Physics.h"
 
 namespace love
 {
@@ -35,7 +36,7 @@ namespace box2d
 	{
 		b2PrismaticJointDef def;
 		
-		def.Initialize(body1->body, body2->body, world->scaleDown(b2Vec2(x,y)), b2Vec2(ax,ay));
+		def.Initialize(body1->body, body2->body, Physics::scaleDown(b2Vec2(x,y)), b2Vec2(ax,ay));
 		def.lowerTranslation = 0.0f;
 		def.upperTranslation = 100.0f;
 		def.enableLimit = true;
@@ -51,12 +52,12 @@ namespace box2d
 
 	float PrismaticJoint::getJointTranslation() const
 	{
-		return world->scaleDown(joint->GetJointTranslation());
+		return Physics::scaleDown(joint->GetJointTranslation());
 	}
 
 	float PrismaticJoint::getJointSpeed() const
 	{
-		return world->scaleDown(joint->GetJointSpeed());
+		return Physics::scaleDown(joint->GetJointSpeed());
 	}
 
 	void PrismaticJoint::enableMotor(bool motor)
@@ -71,22 +72,22 @@ namespace box2d
 
 	void PrismaticJoint::setMaxMotorForce(float force)
 	{
-		joint->SetMaxMotorForce(world->scaleDown(force));
+		joint->SetMaxMotorForce(Physics::scaleDown(force));
 	}
 	
 	void PrismaticJoint::setMotorSpeed(float speed)
 	{
-		joint->SetMotorSpeed(world->scaleDown(speed));
+		joint->SetMotorSpeed(Physics::scaleDown(speed));
 	}
 
 	float PrismaticJoint::getMotorSpeed() const
 	{
-		return world->scaleUp(joint->GetMotorSpeed());
+		return Physics::scaleUp(joint->GetMotorSpeed());
 	}
 
 	float PrismaticJoint::getMotorForce(float inv_dt) const
 	{
-		return world->scaleUp(joint->GetMotorForce(inv_dt));
+		return Physics::scaleUp(joint->GetMotorForce(inv_dt));
 	}
 
 	void PrismaticJoint::enableLimit(bool limit)
@@ -101,33 +102,33 @@ namespace box2d
 
 	void PrismaticJoint::setUpperLimit(float limit)
 	{
-		joint->SetLimits(joint->GetLowerLimit(), world->scaleDown(limit));
+		joint->SetLimits(joint->GetLowerLimit(), Physics::scaleDown(limit));
 	}
 
 	void PrismaticJoint::setLowerLimit(float limit)
 	{
-		joint->SetLimits(world->scaleDown(limit), joint->GetUpperLimit());
+		joint->SetLimits(Physics::scaleDown(limit), joint->GetUpperLimit());
 	}
 
 	void PrismaticJoint::setLimits(float lower, float upper)
 	{
-		joint->SetLimits(world->scaleDown(lower), world->scaleDown(upper));
+		joint->SetLimits(Physics::scaleDown(lower), Physics::scaleDown(upper));
 	}
 
 	float PrismaticJoint::getLowerLimit() const
 	{
-		return world->scaleUp(joint->GetLowerLimit());
+		return Physics::scaleUp(joint->GetLowerLimit());
 	}
 
 	float PrismaticJoint::getUpperLimit() const
 	{
-		return world->scaleUp(joint->GetUpperLimit());
+		return Physics::scaleUp(joint->GetUpperLimit());
 	}
 
 	int PrismaticJoint::getLimits(lua_State * L)
 	{
-		lua_pushnumber(L, world->scaleUp(joint->GetLowerLimit()));
-		lua_pushnumber(L, world->scaleUp(joint->GetUpperLimit()));
+		lua_pushnumber(L, Physics::scaleUp(joint->GetLowerLimit()));
+		lua_pushnumber(L, Physics::scaleUp(joint->GetUpperLimit()));
 		return 2;
 	}
 

src/modules/physics/box2d/PulleyJoint.cpp

@@ -23,6 +23,7 @@
 // Module
 #include "Body.h"
 #include "World.h"
+#include "Physics.h"
 
 namespace love
 {
@@ -34,8 +35,8 @@ namespace box2d
 		: Joint(body1, body2), joint(NULL)
 	{
 		b2PulleyJointDef def;
-		def.Initialize(body1->body, body2->body, world->scaleDown(groundAnchor1), world->scaleDown(groundAnchor2), \
-			 world->scaleDown(anchor1), world->scaleDown(anchor2), ratio);
+		def.Initialize(body1->body, body2->body, Physics::scaleDown(groundAnchor1), Physics::scaleDown(groundAnchor2), \
+			 Physics::scaleDown(anchor1), Physics::scaleDown(anchor2), ratio);
 		def.collideConnected = collideConnected;
 		
 		joint = (b2PulleyJoint*)createJoint(&def);
@@ -49,21 +50,21 @@ namespace box2d
 
 	int PulleyJoint::getGroundAnchors(lua_State * L)
 	{
-		lua_pushnumber(L, world->scaleUp(joint->GetGroundAnchorA().x));
-		lua_pushnumber(L, world->scaleUp(joint->GetGroundAnchorA().y));
-		lua_pushnumber(L, world->scaleUp(joint->GetGroundAnchorB().x));
-		lua_pushnumber(L, world->scaleUp(joint->GetGroundAnchorB().y));
+		lua_pushnumber(L, Physics::scaleUp(joint->GetGroundAnchorA().x));
+		lua_pushnumber(L, Physics::scaleUp(joint->GetGroundAnchorA().y));
+		lua_pushnumber(L, Physics::scaleUp(joint->GetGroundAnchorB().x));
+		lua_pushnumber(L, Physics::scaleUp(joint->GetGroundAnchorB().y));
 		return 4;
 	}
 	
 	float PulleyJoint::getLength1() const
 	{
-		return world->scaleUp(joint->GetLength1());
+		return Physics::scaleUp(joint->GetLength1());
 	}
 		
 	float PulleyJoint::getLength2() const
 	{
-		return world->scaleUp(joint->GetLength2());
+		return Physics::scaleUp(joint->GetLength2());
 	}
 	
 	float PulleyJoint::getRatio() const

src/modules/physics/box2d/RevoluteJoint.cpp

@@ -25,6 +25,7 @@
 // Module
 #include "Body.h"
 #include "World.h"
+#include "Physics.h"
 
 namespace love
 {
@@ -36,7 +37,7 @@ namespace box2d
 		: Joint(body1, body2), joint(NULL)
 	{	
 		b2RevoluteJointDef def;
-		def.Initialize(body1->body, body2->body, world->scaleDown(b2Vec2(x,y)));
+		def.Initialize(body1->body, body2->body, Physics::scaleDown(b2Vec2(x,y)));
 		def.collideConnected = collideConnected;
 		joint = (b2RevoluteJoint*)createJoint(&def);
 	}

src/modules/physics/box2d/RopeJoint.cpp

@@ -23,6 +23,7 @@
 // Module
 #include "Body.h"
 #include "World.h"
+#include "Physics.h"
 
 namespace love
 {
@@ -36,9 +37,9 @@ namespace box2d
 		b2RopeJointDef def;
 		def.bodyA = body1->body;
 		def.bodyB = body2->body;
-		def.localAnchorA = world->scaleDown(b2Vec2(x1,y1));
-		def.localAnchorB = world->scaleDown(b2Vec2(x2,y2));
-		def.maxLength = world->scaleDown(maxLength);
+		def.localAnchorA = Physics::scaleDown(b2Vec2(x1,y1));
+		def.localAnchorB = Physics::scaleDown(b2Vec2(x2,y2));
+		def.maxLength = Physics::scaleDown(maxLength);
 		def.collideConnected = collideConnected;
 		joint = (b2RopeJoint*)createJoint(&def);
 	}
@@ -51,7 +52,7 @@ namespace box2d
 
 	float RopeJoint::getMaxLength() const
 	{
-		return world->scaleUp(joint->GetMaxLength());
+		return Physics::scaleUp(joint->GetMaxLength());
 	}
 
 

src/modules/physics/box2d/Shape.cpp

@@ -23,6 +23,7 @@
 // Module
 #include "Body.h"
 #include "World.h"
+#include "Physics.h"
 
 // STD
 #include <bitset>
@@ -33,8 +34,8 @@ namespace physics
 {
 namespace box2d
 {
-	Shape::Shape(World * world)
-		: world(world), shape(NULL)
+	Shape::Shape()
+		: shape(NULL)
 	{
 	}
 
@@ -62,7 +63,7 @@ namespace box2d
 	
 	float Shape::getRadius() const
 	{
-		return world->scaleUp(shape->m_radius);
+		return Physics::scaleUp(shape->m_radius);
 	}
 	
 	int Shape::getChildCount() const
@@ -73,19 +74,19 @@ namespace box2d
 	bool Shape::testPoint(float x, float y, float r, float px, float py) const
 	{
 		b2Vec2 point(px, py);
-		b2Transform transform(world->scaleDown(b2Vec2(x, y)), b2Rot(r));
-		return shape->TestPoint(transform, world->scaleDown(point));
+		b2Transform transform(Physics::scaleDown(b2Vec2(x, y)), b2Rot(r));
+		return shape->TestPoint(transform, Physics::scaleDown(point));
 	}
 	
 	int Shape::rayCast(lua_State * L) const
 	{
-		float p1x = world->scaleDown((float)luaL_checknumber(L, 1));
-		float p1y = world->scaleDown((float)luaL_checknumber(L, 2));
-		float p2x = world->scaleDown((float)luaL_checknumber(L, 3));
-		float p2y = world->scaleDown((float)luaL_checknumber(L, 4));
+		float p1x = Physics::scaleDown((float)luaL_checknumber(L, 1));
+		float p1y = Physics::scaleDown((float)luaL_checknumber(L, 2));
+		float p2x = Physics::scaleDown((float)luaL_checknumber(L, 3));
+		float p2y = Physics::scaleDown((float)luaL_checknumber(L, 4));
 		float maxFraction = (float)luaL_checknumber(L, 5);
-		float x = world->scaleDown((float)luaL_checknumber(L, 6));
-		float y = world->scaleDown((float)luaL_checknumber(L, 7));
+		float x = Physics::scaleDown((float)luaL_checknumber(L, 6));
+		float y = Physics::scaleDown((float)luaL_checknumber(L, 7));
 		float r = (float)luaL_checknumber(L, 8);
 		int childIndex = (int)luaL_optint(L, 9, 0);
 		b2RayCastInput input;
@@ -95,22 +96,22 @@ namespace box2d
 		b2Transform transform(b2Vec2(x, y), b2Rot(r));
 		b2RayCastOutput output;
 		shape->RayCast(&output, input, transform, childIndex);
-		lua_pushnumber(L, world->scaleUp(output.normal.x));
-		lua_pushnumber(L, world->scaleUp(output.normal.y));
+		lua_pushnumber(L, Physics::scaleUp(output.normal.x));
+		lua_pushnumber(L, Physics::scaleUp(output.normal.y));
 		lua_pushnumber(L, output.fraction);
 		return 3;
 	}
 	
 	int Shape::computeAABB(lua_State * L) const
 	{
-		float x = world->scaleDown((float)luaL_checknumber(L, 1));
-		float y = world->scaleDown((float)luaL_checknumber(L, 2));
+		float x = Physics::scaleDown((float)luaL_checknumber(L, 1));
+		float y = Physics::scaleDown((float)luaL_checknumber(L, 2));
 		float r = (float)luaL_checknumber(L, 3);
 		int childIndex = (int)luaL_optint(L, 4, 0);
 		b2Transform transform(b2Vec2(x, y), b2Rot(r));
 		b2AABB box;
 		shape->ComputeAABB(&box, transform, childIndex);
-		box = world->scaleUp(box);
+		box = Physics::scaleUp(box);
 		lua_pushnumber(L, box.lowerBound.x);
 		lua_pushnumber(L, box.lowerBound.y);
 		lua_pushnumber(L, box.upperBound.x);
@@ -120,10 +121,10 @@ namespace box2d
 	
 	int Shape::computeMass(lua_State * L) const
 	{
-		float density = world->scaleDown((float)luaL_checknumber(L, 1));
+		float density = Physics::scaleDown((float)luaL_checknumber(L, 1));
 		b2MassData data;
 		shape->ComputeMass(&data, density);
-		b2Vec2 center = world->scaleUp(data.center);
+		b2Vec2 center = Physics::scaleUp(data.center);
 		lua_pushnumber(L, center.x);
 		lua_pushnumber(L, center.y);
 		lua_pushnumber(L, data.mass);

src/modules/physics/box2d/Shape.h

@@ -44,8 +44,6 @@ namespace box2d
 	**/
 	class Shape : public love::physics::Shape
 	{
-	private:
-		World * world; // We need a reference for scaling up/down
 	
 	protected:
 
@@ -57,7 +55,7 @@ namespace box2d
 		/**
 		* Creates a Shape.
 		**/
-		Shape(World * world);
+		Shape();
 
 		virtual ~Shape();
 

src/modules/physics/box2d/WeldJoint.cpp

@@ -25,6 +25,7 @@
 // Module
 #include "Body.h"
 #include "World.h"
+#include "Physics.h"
 
 namespace love
 {
@@ -36,7 +37,7 @@ namespace box2d
 		: Joint(body1, body2), joint(NULL)
 	{	
 		b2WeldJointDef def;
-		def.Initialize(body1->body, body2->body, world->scaleDown(b2Vec2(x,y)));
+		def.Initialize(body1->body, body2->body, Physics::scaleDown(b2Vec2(x,y)));
 		def.collideConnected = collideConnected;
 		joint = (b2WeldJoint*)createJoint(&def);
 	}

src/modules/physics/box2d/WheelJoint.cpp

@@ -23,6 +23,7 @@
 // Module
 #include "Body.h"
 #include "World.h"
+#include "Physics.h"
 
 namespace love
 {
@@ -35,7 +36,7 @@ namespace box2d
 	{
 		b2WheelJointDef def;
 		
-		def.Initialize(body1->body, body2->body, world->scaleDown(b2Vec2(x,y)), b2Vec2(ax,ay));
+		def.Initialize(body1->body, body2->body, Physics::scaleDown(b2Vec2(x,y)), b2Vec2(ax,ay));
 		def.collideConnected = collideConnected;
 		joint = (b2WheelJoint*)createJoint(&def);
 	}
@@ -48,12 +49,12 @@ namespace box2d
 
 	float WheelJoint::getJointTranslation() const
 	{
-		return world->scaleDown(joint->GetJointTranslation());
+		return Physics::scaleDown(joint->GetJointTranslation());
 	}
 
 	float WheelJoint::getJointSpeed() const
 	{
-		return world->scaleDown(joint->GetJointSpeed());
+		return Physics::scaleDown(joint->GetJointSpeed());
 	}
 
 	void WheelJoint::enableMotor(bool motor)
@@ -68,47 +69,47 @@ namespace box2d
 	
 	void WheelJoint::setMotorSpeed(float speed)
 	{
-		joint->SetMotorSpeed(world->scaleDown(speed));
+		joint->SetMotorSpeed(Physics::scaleDown(speed));
 	}
 
 	float WheelJoint::getMotorSpeed() const
 	{
-		return world->scaleUp(joint->GetMotorSpeed());
+		return Physics::scaleUp(joint->GetMotorSpeed());
 	}
 	
 	void WheelJoint::setMaxMotorTorque(float torque)
 	{
-		joint->SetMaxMotorTorque(world->scaleDown(torque));
+		joint->SetMaxMotorTorque(Physics::scaleDown(torque));
 	}
 	
 	float WheelJoint::getMaxMotorTorque() const
 	{
-		return world->scaleUp(joint->GetMaxMotorTorque());
+		return Physics::scaleUp(joint->GetMaxMotorTorque());
 	}
 
 	float WheelJoint::getMotorTorque(float inv_dt) const
 	{
-		return world->scaleUp(joint->getMotorTorque(inv_dt));
+		return Physics::scaleUp(joint->GetMotorTorque(inv_dt));
 	}
 	
 	void WheelJoint::setSpringFrequencyHz(float hz)
 	{
-		joint->SetSpringFrequencyHz(world->scaleDown(hz));
+		joint->SetSpringFrequencyHz(Physics::scaleDown(hz));
 	}
 	
 	float WheelJoint::getSpringFrequencyHz() const
 	{
-		return world->scaleUp(joint->GetSpringFrequencyHz());
+		return Physics::scaleUp(joint->GetSpringFrequencyHz());
 	}
 	
 	void WheelJoint::setSpringDampingRatio(float ratio)
 	{
-		joint->SetSpringDampingRatio(world->scaleDown(ratio));
+		joint->SetSpringDampingRatio(Physics::scaleDown(ratio));
 	}
 	
 	float WheelJoint::getSpringDampingRatio() const
 	{
-		return world->scaleUp(joint->GetSpringDampingRatio());
+		return Physics::scaleUp(joint->GetSpringDampingRatio());
 	}
 
 

src/modules/physics/box2d/World.cpp

@@ -22,6 +22,7 @@
 
 #include "Shape.h"
 #include "Contact.h"
+#include "Physics.h"
 #include <common/Reference.h>
 
 namespace love
@@ -98,7 +99,7 @@ namespace box2d
 	World::World(b2AABB aabb)
 		: world(NULL), meter(DEFAULT_METER)
 	{
-		world = new b2World(scaleDown(aabb), b2Vec2(0,0), true);
+		world = new b2World(Physics::scaleDown(aabb), b2Vec2(0,0), true);
 		world->SetContactListener(this);
 		b2BodyDef def;
 		groundBody = world->CreateBody(def);
@@ -107,7 +108,7 @@ namespace box2d
 	World::World(b2AABB aabb, b2Vec2 gravity, bool sleep, int meter)
 		: world(NULL), meter(meter)
 	{
-		world = new b2World(scaleDown(aabb), scaleDown(gravity), sleep);
+		world = new b2World(Physics::scaleDown(aabb), Physics::scaleDown(gravity), sleep);
 		world->SetContactListener(this);
 	}
 
@@ -183,12 +184,12 @@ namespace box2d
 
 	void World::setGravity(float x, float y)
 	{
-		world->SetGravity(scaleDown(b2Vec2(x, y)));
+		world->SetGravity(Physics::scaleDown(b2Vec2(x, y)));
 	}
 
 	int World::getGravity(lua_State * L)
 	{
-		b2Vec2 v = scaleUp(world->m_gravity);
+		b2Vec2 v = Physics::scaleUp(world->m_gravity);
 		lua_pushnumber(L, v.x);
 		lua_pushnumber(L, v.y);
 		return 2;
@@ -213,68 +214,6 @@ namespace box2d
 	{
 		return world->GetJointCount();
 	}
-
-	void World::setMeter(int meter)
-	{
-		this->meter = meter;
-	}
-
-	int World::getMeter() const
-	{
-		return this->meter;
-	}
-
-	void World::scaleDown(float & x, float & y)
-	{
-		x /= (float)meter;
-		y /= (float)meter;
-	}
-
-	void World::scaleUp(float & x, float & y)
-	{
-		x *= (float)meter;
-		y *= (float)meter;
-	}
-
-	float World::scaleDown(float f)
-	{
-		return f/(float)meter;
-	}
-
-	float World::scaleUp(float f)
-	{
-		return f*(float)meter;
-	}
-
-	b2Vec2 World::scaleDown(const b2Vec2 & v)
-	{
-		b2Vec2 t = v;
-		scaleDown(t.x, t.y);
-		return t;
-	}
-
-	b2Vec2 World::scaleUp(const b2Vec2 & v)
-	{
-		b2Vec2 t = v;
-		scaleUp(t.x, t.y);
-		return t;
-	}
-
-	b2AABB World::scaleDown(const b2AABB & aabb)
-	{
-		b2AABB t;
-		t.lowerBound = scaleDown(aabb.lowerBound);
-		t.upperBound = scaleDown(aabb.upperBound);
-		return t;
-	}
-
-	b2AABB World::scaleUp(const b2AABB & aabb)
-	{
-		b2AABB t;
-		t.lowerBound = scaleUp(aabb.lowerBound);
-		t.upperBound = scaleUp(aabb.upperBound);
-		return t;
-	}
 	
 	b2Body * World::getGroundBody()
 	{

src/modules/physics/box2d/World.h

@@ -84,9 +84,6 @@ namespace box2d
 		// Contact callbacks.
 		ContactCallback add, persist, remove, result;
 
-		// The length of one meter in pixels.
-		int meter;
-
 	public:
 
 		/**
@@ -176,74 +173,6 @@ namespace box2d
 		* @return The number of joints.
 		**/
 		int getJointCount();
-
-		/**
-		* Sets the number of pixels in one meter.
-		* @param pixels The number of pixels in one meter. (1m ~= 3.3ft).
-		**/
-		void setMeter(int meter);
-
-		/**
-		* Gets the number of pixels in one meter.
-		* @param pixels The number of pixels in one meter. (1m ~= 3.3ft).
-		**/
-		int getMeter() const;
-
-		/**
-		* Scales a value down according to the current meter in pixels.
-		* @param f The unscaled input value.
-		**/
-		float scaleDown(float f);
-
-		/**
-		* Scales a value up according to the current meter in pixels.
-		* @param f The unscaled input value.
-		**/
-		float scaleUp(float f);
-
-		/**
-		* Scales a point down according to the current meter
-		* in pixels, for instance x = x0/meter, y = x0/meter.
-		* @param x The x-coordinate of the point to scale.
-		* @param y The y-coordinate of the point to scale.
-		**/
-		void scaleDown(float & x, float & y);
-
-		/**
-		* Scales a point up according to the current meter
-		* in pixels, for instance x = x0/meter, y = x0/meter.
-		* @param x The x-coordinate of the point to scale.
-		* @param y The y-coordinate of the point to scale.
-		**/
-		void scaleUp(float & x, float & y);
-
-		/**
-		* Scales a b2Vec2 down according to the current meter in pixels.
-		* @param v The unscaled input vector.
-		* @return The scaled vector.
-		**/
-		b2Vec2 scaleDown(const b2Vec2 & v);
-
-		/**
-		* Scales a b2Vec up according to the current meter in pixels.
-		* @param v The unscaled input vector.
-		* @return The scaled vector.
-		**/
-		b2Vec2 scaleUp(const b2Vec2 & v);
-
-		/**
-		* Scales a b2AABB down according to the current meter in pixels.
-		* @param v The unscaled input AABB.
-		* @return The scaled AABB.
-		**/
-		b2AABB scaleDown(const b2AABB & aabb);
-
-		/**
-		* Scales a b2AABB up according to the current meter in pixels.
-		* @param v The unscaled input AABB.
-		* @return The scaled AABB.
-		**/
-		b2AABB scaleUp(const b2AABB & aabb);
         
         /**
         * Gets the ground body.

src/modules/physics/box2d/wrap_Physics.cpp

@@ -262,6 +262,19 @@ namespace box2d
 		luax_newtype(L, "RopeJoint", PHYSICS_ROPE_JOINT_T, (void*)j);
 		return 1;
 	}
+	
+	int w_setMeter(lua_State * L)
+	{
+		int arg1 = luaL_checkint(L, 1);
+		Physics::setMeter(arg1);
+		return 0;
+		
+	}
+	int w_getMeter(lua_State * L)
+	{
+		lua_pushinteger(L, Physics::getMeter());
+		return 1;
+	}
 
 	// List of functions to wrap.
 	static const luaL_Reg functions[] = {
@@ -281,6 +294,8 @@ namespace box2d
 		{ "newWeldJoint", w_newWeldJoint },
 		{ "newWheelJoint", w_newWheelJoint },
 		{ "newRopeJoint", w_newRopeJoint },
+		{ "getMeter", w_getMeter },
+		{ "setMeter", w_setMeter },
 		{ 0, 0 },
 	};
 

src/modules/physics/box2d/wrap_Physics.h

@@ -65,6 +65,8 @@ namespace box2d
 	int w_newWeldJoint(lua_State * L);
 	int w_newWheelJoint(lua_State * L);
 	int w_newRopeJoint(lua_State * L);
+	int w_setMeter(lua_State * L);
+	int w_getMeter(lua_State * L);
 	extern "C" LOVE_EXPORT int luaopen_love_physics(lua_State * L);
 
 } // box2d

src/modules/physics/box2d/wrap_World.cpp

@@ -98,21 +98,6 @@ namespace box2d
 		lua_pushinteger(L, t->getJointCount());
 		return 1;
 	}
-	
-	int w_World_setMeter(lua_State * L)
-	{
-		World * t = luax_checkworld(L, 1);
-		int arg1 = luaL_checkint(L, 2);
-		t->setMeter(arg1);
-		return 0;
-		
-	}
-	int w_World_getMeter(lua_State * L)
-	{
-		World * t = luax_checkworld(L, 1);
-		lua_pushinteger(L, t->getMeter());
-		return 1;
-	}
 
 	static const luaL_Reg functions[] = {
 		{ "update", w_World_update },
@@ -124,8 +109,6 @@ namespace box2d
 		{ "isAllowSleep", w_World_isAllowSleep },
 		{ "getBodyCount", w_World_getBodyCount },
 		{ "getJointCount", w_World_getJointCount },
-		{ "setMeter", w_World_setMeter },
-		{ "getMeter", w_World_getMeter },
 		{ 0, 0 }
 	};
 

src/modules/physics/box2d/wrap_World.h

@@ -41,8 +41,6 @@ namespace box2d
 	int w_World_isAllowSleep(lua_State * L);
 	int w_World_getBodyCount(lua_State * L);
 	int w_World_getJointCount(lua_State * L);
-	int w_World_setMeter(lua_State * L);
-	int w_World_getMeter(lua_State * L);
 	int luaopen_world(lua_State * L);
 
 } // box2d