public cpConstraint(cpBody a, cpBody b)
{
/// The first body connected to this constraint.
this.a = a;
/// The second body connected to this constraint.
this.b = b;
this.space = null;
this.next_a = null;
this.next_b = null;
/// The maximum force that this constraint is allowed to use.
this.maxForce = cp.Infinity;
/// The rate at which joint error is corrected.
/// Defaults to pow(1 - 0.1, 60) meaning that it will
/// correct 10% of the error every 1/60th of a second.
this.errorBias = cp.cpfpow(1f - 0.1f, 60f);
/// The maximum rate at which joint error is corrected.
this.maxBias = cp.Infinity;
this.collideBodies = true;
//Not clear
preSolve = DefaultPreSolve;
postSolve = DefaultPostSolve;
}
//public CollisionHandler DefaultHandler { get; set; }
#endregion
//MARK: Misc Helper Funcs
// Default collision functions.
static bool DefaultBegin(cpArbiter arb, cpSpace space, object data)
{
bool retA = arb.CallWildcardBeginA(space); // cpArbiterCallWildcardBeginA(arb, space);
bool retB = arb.CallWildcardBeginB(space); // cpArbiterCallWildcardBeginB(arb, space);
return(retA && retB);
}
//public static cpShapeFilter FILTER_ALL = new cpShapeFilter(cp.NO_GROUP, (int)cpShapeFilterMask.All, (int)cpShapeFilterMask.All);
//public static cpShapeFilter FILTER_NONE = new cpShapeFilter(cp.NO_GROUP, (int)cpShapeFilterMask.None, (int)cpShapeFilterMask.None);
public cpShape(cpBody body, cpShapeMassInfo massInfo)
{
/// The rigid body this collision shape is attached to.
this.body = body;
this.massInfo = massInfo;
/// The current bounding box of the shape.
/// The current bounding box of the shape.
///
//this.bb_l = this.bb_b = this.bb_r = this.bb_t = 0;
this.bb = new cpBB(0, 0, 0, 0);
//this.hashid = (cp.shapeIDCounter++).ToString();
/// Sensor flag.
/// Sensor shapes call collision callbacks but don't produce collisions.
this.sensor = false;
filter = new cpShapeFilter(cp.NO_GROUP, (int)cpShapeFilterMask.Default, (int)cpShapeFilterMask.Default);
/// Coefficient of restitution. (elasticity)
this.e = 0;
/// Coefficient of friction.
this.u = 0;
/// Surface velocity used when solving for friction.
this.surfaceV = cpVect.Zero;
/// Collision type of this shape used when picking collision handlers.
this.type = 0;
this.space = null;
}
static bool DefaultPreSolve(cpArbiter arb, cpSpace space, object data)
{
bool retA = arb.CallWildcardPreSolveA(space);
bool retB = arb.CallWildcardPreSolveB(space);
return(retA && retB);
}
public void CallWildcardSeparateB(cpSpace space)
{
cpCollisionHandler handler = this.handlerB;
this.swapped = !this.swapped;
handler.separateFunc(this, space, handler.userData);
this.swapped = !this.swapped;
}
public void CallWildcardPostSolveB(cpSpace space)
{
cpCollisionHandler handler = this.handlerB;
this.swapped = !this.swapped;
handler.postSolveFunc(this, space, handler.userData);
this.swapped = !this.swapped;
}
public bool CallWildcardPreSolveB(cpSpace space)
{
cpCollisionHandler handler = this.handlerB;
this.swapped = !this.swapped;
bool retval = handler.preSolveFunc(this, space, handler.userData);
this.swapped = !this.swapped;
return(retval);
}
/// <summary>
/// CREATES A BODY WITH MASS AND INERTIA
/// </summary>
/// <param name="mass"></param>
/// <param name="moment"></param>
public cpBody(float mass, float moment)
{
transform = new cpTransform();
this.cog = cpVect.Zero;
this.space = null;
this.shapeList = null;
this.arbiterList = null; // These are both wacky linked lists.
this.constraintList = null;
velocity_func = UpdateVelocity;
position_func = UpdatePosition;
// This stuff is used to track information on the collision graph.
this.nodeRoot = null;
this.nodeNext = null;
this.nodeIdleTime = 0;
/// Position of the rigid body's center of gravity.
this.p = cpVect.Zero;
/// Velocity of the rigid body's center of gravity.
this.v = cpVect.Zero;
/// Force acting on the rigid body's center of gravity.
this.f = cpVect.Zero;
/// Angular velocity of the body around it's center of gravity in radians/second.
this.w = 0;
/// Torque applied to the body around it's center of gravity.
this.t = 0;
// This stuff is all private.
this.v_bias = cpVect.Zero; //x = this.v_biasy = 0;
this.w_bias = 0;
this.userData = null;
this.SetMass(mass);
this.SetMoment(moment);
this.SetAngle(0.0f);
}
// Defined in cpSpace.c
// Wake up a sleeping or idle body.
public void Activate()
{
if (bodyType == cpBodyType.DYNAMIC)
{
nodeIdleTime = 0.0f;
cpBody root = nodeRoot;
if (root != null && root.IsSleeping())
{
// TODO should cpBodyIsSleeping(root) be an assertion?
cp.AssertSoft(root.bodyType == cpBodyType.DYNAMIC, "Internal Error: Non-dynamic body component root detected.");
cpSpace space = root.space;
cpBody body = root;
while (body != null)
{
cpBody next = body.nodeNext;
body.nodeIdleTime = 0.0f;
body.nodeRoot = null;
body.nodeNext = null;
space.ActivateBody(body);
body = next;
}
space.sleepingComponents.Remove(root);
}
eachArbiter((arb, o) =>
{
// Reset the idle timer of things the body is touching as well.
// That way things don't get left hanging in the air.
cpBody other = (arb.body_a == this ? arb.body_b : arb.body_a);
if (other.bodyType != cpBodyType.STATIC)
{
other.nodeIdleTime = 0.0f;
}
}, null);
}
}
public void CallWildcardSeparateA(cpSpace space)
{
cpCollisionHandler handler = this.handlerA;
handler.separateFunc(this, space, handler.userData);
}
public void CallWildcardPostSolveA(cpSpace space)
{
cpCollisionHandler handler = this.handlerA;
handler.postSolveFunc(this, space, handler.userData);
}
public bool CallWildcardPreSolveA(cpSpace space)
{
cpCollisionHandler handler = this.handlerA;
return(handler.preSolveFunc(this, space, handler.userData));
}
//Function called after the solver runs. This can be overridden by the user
//to customize the constraint.
//Use the applied impulse to perform effects like breakable joints.
public virtual void DefaultPostSolve(cpSpace space)
{
}
public static bool AlwaysCollide(cpArbiter arb, cpSpace space, object data)
{
return(true);
}
public static void DefaultSeparate(cpArbiter arb, cpSpace space, object o)
{
}
public static void DefaultPostSolve(cpArbiter arb, cpSpace space, object o)
{
}
public static bool DefaultPreSolve(cpArbiter arb, cpSpace space, object o)
{
return(true);
}
public static bool DefaultBegin(cpArbiter arb, cpSpace space, object o)
{
return(true);
}
public void Update(cpCollisionInfo info, cpSpace space)
{
cpShape a = info.a, b = info.b;
// For collisions between two similar primitive types, the order could have been swapped since the last frame.
this.a = a; this.body_a = a.body;
this.b = b; this.body_b = b.body;
// Iterate over the possible pairs to look for hash value matches.
for (int i = 0; i < info.count; i++)
{
cpContact con = info.arr[i];
// r1 and r2 store absolute offsets at init time.
// Need to convert them to relative offsets.
con.r1 = cpVect.cpvsub(con.r1, a.body.p);
con.r2 = cpVect.cpvsub(con.r2, b.body.p);
// Cached impulses are not zeroed at init time.
con.jnAcc = con.jtAcc = 0.0f;
for (int j = 0; j < this.Count; j++)
{
cpContact old = this.contacts[j];
// This could trigger false positives, but is fairly unlikely nor serious if it does.
if (con.hash == old.hash)
{
// Copy the persistant contact information.
con.jnAcc = old.jnAcc;
con.jtAcc = old.jtAcc;
}
}
}
//TODO: revise
this.contacts = info.arr;
//this.count = info.count;
this.n = info.n;
this.e = a.e * b.e;
this.u = a.u * b.u;
cpVect surface_vr = cpVect.cpvsub(b.surfaceV, a.surfaceV);
this.surface_vr = cpVect.cpvsub(surface_vr, cpVect.cpvmult(info.n, cpVect.cpvdot(surface_vr, info.n)));
ulong typeA = info.a.type, typeB = info.b.type;
cpCollisionHandler defaultHandler = space.defaultHandler;
cpCollisionHandler handler = this.handler = space.LookupHandler(typeA, typeB, defaultHandler);
// Check if the types match, but don't swap for a default handler which use the wildcard for type A.
bool swapped = this.swapped = (typeA != handler.typeA && handler.typeA != cp.WILDCARD_COLLISION_TYPE);
if (handler != defaultHandler || space.usesWildcards)
{
// The order of the main handler swaps the wildcard handlers too. Uffda.
this.handlerA = space.LookupHandler(swapped ? typeB : typeA, cp.WILDCARD_COLLISION_TYPE, cpCollisionHandler.cpCollisionHandlerDoNothing);
this.handlerB = space.LookupHandler(swapped ? typeA : typeB, cp.WILDCARD_COLLISION_TYPE, cpCollisionHandler.cpCollisionHandlerDoNothing);
}
// mark it as new if it's been cached
if (this.state == cpArbiterState.Cached)
{
this.state = cpArbiterState.FirstCollision;
}
}
static void DefaultSeparate(cpArbiter arb, cpSpace space, object data)
{
arb.CallWildcardSeparateA(space);
arb.CallWildcardSeparateB(space);
}
/// ///////////////////////////////////////////////////////////////////////////
// **** Post Step Callback Functions
static void PostStepDoNothing(cpSpace space, object obj, object data)
{
}
protected XSpaceManager()
{
mSpace = new cpSpace();
mSpace.SetIterations(10);
}
public static void DoNothing(cpArbiter arb, cpSpace space, object data)
{
}
static void DefaultPostSolve(cpArbiter arb, cpSpace space, object data)
{
arb.CallWildcardPostSolveA(space);
arb.CallWildcardPostSolveB(space);
}
public static void AssertSpaceUnlocked(cpSpace space)
{
AssertSoft(!space.IsLocked, "This addition/removal cannot be done safely during a call to cpSpaceStep() or during a query. Put these calls into a post-step callback.");
}
public bool CallWildcardBeginA(cpSpace space)
{
cpCollisionHandler handler = this.handlerA;
return(handler.beginFunc(this, space, handler.userData));
}