public void RemoveBody( PhysBody body )
{
#if DEBUG
//if ( !bodies.Contains( body ) || body.Released )
// throw new InvalidOperationException( "invalid body release" );
#endif
body.Released = true;
}
public Collision( bool collided, float time, PhysBody bodyA, PhysBody bodyB, Vector2 normal, Vector2 isect )
{
Collided = collided;
Time = time;
BodyA = bodyA;
BodyB = bodyB;
Normal = normal;
Intersection = isect;
}
// public methods
public void AddBody( PhysBody body )
{
#if DEBUG
if ( bodies.Contains( body ) && !body.Released )
throw new InvalidOperationException( "body already in space" );
#endif
// if Released is marked true, then the body hasn't been removed yet
if ( !bodies.Contains( body ) )
bodies.Add( body );
body.Released = false;
}
public static Collision TestForCollision( PhysBody bodyA, PhysBody bodyB, float elapsed )
{
if ( bodyA.MotionBounds.Left > bodyB.MotionBounds.Right ||
bodyB.MotionBounds.Left > bodyA.MotionBounds.Right ||
bodyA.MotionBounds.Top < bodyB.MotionBounds.Bottom ||
bodyB.MotionBounds.Top < bodyA.MotionBounds.Bottom )
return new Collision();
if ( bodyA is PhysCircle && bodyB is PhysCircle )
return CircleVsCircle( (PhysCircle)bodyA, (PhysCircle)bodyB, elapsed );
if ( bodyA is PhysCircle && bodyB is PhysPolygon )
return CircleVsPolygon( (PhysCircle)bodyA, (PhysPolygon)bodyB, elapsed );
if ( bodyA is PhysPolygon && bodyB is PhysCircle )
return CircleVsPolygon( (PhysCircle)bodyB, (PhysPolygon)bodyA, elapsed ).GetInvert();
if ( bodyA is PhysPolygon && bodyB is PhysPolygon )
return PolygonVsPolygon( (PhysPolygon)bodyA, (PhysPolygon)bodyB, elapsed );
throw new InvalidCastException( "Unknown physbody type." );
}
// Constructor
public PhysBody( Vector2 pos, Vector2 vel, float mass )
{
Position = pos;
Velocity = vel;
Mass = mass;
MomentOfInertia = 1f;
Force = Vector2.Zero;
Angle = 0.0f;
AngularVelocity = 0.0f;
Torque = 0f;
Flags = BodyFlags.None;
Elasticity = .5f;
Friction = .5f;
TouchNormal = Vector2.Zero;
Touching = null;
Parent = null;
CollisionList = new List<PhysBody>( 4 );
}
public BoundaryTubeObject()
{
Body = null;
Object = null;
Path = new Path();
StartSpeed = 10f;
FinalSpeed = 3.5f;
Time = 0f;
}
// private helpers
private void MoveBody( PhysBody body, float timeStep, float pullBackPct )
{
if ( body.Velocity == Vector2.Zero ) return;
if ( timeStep <= 0f ) return;
body.Moved = true;
Vector2 disp = body.Velocity * timeStep;
if ( pullBackPct != 0f )
disp *= ( 1f - pullBackPct );
body.Position += disp;
body.Angle += body.AngularVelocity * timeStep;
}
