public void OnContact(Box2DX.Collision.Shape other, ContactPoint point)
{
if (!collisionShapes.Contains(other))
{
collisionShapes.Add(other);
}
}
public ShapeEditing()
{
{
PolygonDef sd = new PolygonDef();
sd.SetAsBox(50.0f, 10.0f);
BodyDef bd = new BodyDef();
bd.Position.Set(0.0f, -10.0f);
Body ground = _world.CreateBody(bd);
ground.CreateShape(sd);
}
BodyDef bodydef = new BodyDef();
bodydef.Position.Set(0.0f, 10.0f);
_body = _world.CreateBody(bodydef);
PolygonDef sd_ = new PolygonDef();
sd_.SetAsBox(4.0f, 4.0f, new Vec2(0.0f, 0.0f), 0.0f);
sd_.Density = 10.0f;
_shape1 = _body.CreateShape(sd_);
_body.SetMassFromShapes();
_shape2 = null;
}
public PolygonContact(Shape s1, Shape s2)
: base(s1, s2)
{
Box2DXDebug.Assert(_shape1.GetType() == ShapeType.PolygonShape);
Box2DXDebug.Assert(_shape2.GetType() == ShapeType.PolygonShape);
_manifold.PointCount = 0;
}
public PolyAndCircleContact(Shape s1, Shape s2)
: base(s1, s2)
{
Box2DXDebug.Assert(this._shape1.GetType() == ShapeType.PolygonShape);
Box2DXDebug.Assert(this._shape2.GetType() == ShapeType.CircleShape);
this._manifold.PointCount = 0;
}
public DistanceTest()
{
PolygonDef sd = new PolygonDef();
sd.SetAsBox(1.0f, 1.0f);
sd.Density = 0.0f;
BodyDef bd = new BodyDef();
bd.Position.Set(0.0f, 10.0f);
_body1 = _world.CreateBody(bd);
_shape1 = _body1.CreateShape(sd);
PolygonDef sd2 = new PolygonDef();
sd2.VertexCount = 3;
sd2.Vertices[0].Set(-1.0f, 0.0f);
sd2.Vertices[1].Set(1.0f, 0.0f);
sd2.Vertices[2].Set(0.0f, 15.0f);
sd2.Density = 1.0f;
BodyDef bd2 = new BodyDef();
bd2.Position.Set(0.0f, 10.0f);
_body2 = _world.CreateBody(bd2);
_shape2 = _body2.CreateShape(sd2);
_body2.SetMassFromShapes();
_world.Gravity = new Vec2(0.0f, 0.0f);
}
public override void Keyboard(System.Windows.Forms.Keys key)
{
switch (key)
{
case System.Windows.Forms.Keys.C:
if (_shape2 == null)
{
CircleDef sd = new CircleDef();
sd.Radius = 3.0f;
sd.Density = 10.0f;
sd.LocalPosition.Set(0.5f, -4.0f);
_shape2 = _body.CreateShape(sd);
_body.SetMassFromShapes();
_body.WakeUp();
}
break;
case System.Windows.Forms.Keys.D:
if (_shape2 != null)
{
_body.DestroyShape(_shape2);
_shape2 = null;
_body.SetMassFromShapes();
_body.WakeUp();
}
break;
}
}
public TimeOfImpact()
{
{
PolygonDef sd = new PolygonDef();
sd.Density = 0.0f;
sd.SetAsBox(0.1f, 10.0f, new Vec2(10.0f, 0.0f), 0.0f);
BodyDef bd = new BodyDef();
bd.Position.Set(0.0f, 20.0f);
bd.Angle = 0.0f;
_body1 = _world.CreateBody(bd);
_shape1 = _body1.CreateShape(sd);
}
{
PolygonDef sd = new PolygonDef();
sd.SetAsBox(0.25f, 0.25f);
sd.Density = 1.0f;
BodyDef bd = new BodyDef();
bd.Position.Set(9.6363468f, 28.050615f);
bd.Angle = 1.6408679f;
_body2 = _world.CreateBody(bd);
_shape2 = (PolygonShape)_body2.CreateShape(sd);
_body2.SetMassFromShapes();
}
}
/// <summary>
/// Return true if the given shape should be considered for ray intersection.
/// </summary>
public bool RayCollide(object userData, Shape shape)
{
//By default, cast userData as a shape, and then collide if the shapes would collide
if (userData == null)
return true;
return ShouldCollide((Shape)userData, shape);
}
public Fixture()
{
UserData = null;
Body = null;
_next = null;
ProxyId = BroadPhase.NullProxy;
Shape = null;
}
public CircleContact(Shape s1, Shape s2)
: base(s1, s2)
{
Box2DXDebug.Assert(this._shape1.GetType() == ShapeType.CircleShape);
Box2DXDebug.Assert(this._shape2.GetType() == ShapeType.CircleShape);
this._manifold.PointCount = 0;
this._manifold.Points[0].NormalImpulse = 0f;
this._manifold.Points[0].TangentImpulse = 0f;
}
/// <summary>
/// Return true if contact calculations should be performed between these two shapes.
/// If you implement your own collision filter you may want to build from this implementation.
/// @warning for performance reasons this is only called when the AABBs begin to overlap.
/// </summary>
public virtual bool ShouldCollide(Shape shape1, Shape shape2)
{
FilterData filter1 = shape1.FilterData;
FilterData filter2 = shape2.FilterData;
if (filter1.GroupIndex == filter2.GroupIndex && filter1.GroupIndex != 0)
{
return filter1.GroupIndex > 0;
}
bool collide = (filter1.MaskBits & filter2.CategoryBits) != 0 && (filter1.CategoryBits & filter2.MaskBits) != 0;
return collide;
}
protected Shape(ShapeDef def)
{
this._userData = def.UserData;
this._friction = def.Friction;
this._restitution = def.Restitution;
this._density = def.Density;
this._body = null;
this._sweepRadius = 0f;
this._next = null;
this._proxyId = PairManager.NullProxy;
this._filter = def.Filter;
this._isSensor = def.IsSensor;
}
public virtual bool ShouldCollide(Shape shape1, Shape shape2)
{
FilterData filterData = shape1.FilterData;
FilterData filterData2 = shape2.FilterData;
bool result;
if (filterData.GroupIndex == filterData2.GroupIndex && filterData.GroupIndex != 0)
{
result = (filterData.GroupIndex > 0);
}
else
{
bool flag = (filterData.MaskBits & filterData2.CategoryBits) != 0 && (filterData.CategoryBits & filterData2.MaskBits) != 0;
result = flag;
}
return result;
}
public Contact(Shape s1, Shape s2)
{
this._flags = (Contact.CollisionFlags)0;
if (s1.IsSensor || s2.IsSensor)
{
this._flags |= Contact.CollisionFlags.NonSolid;
}
this._shape1 = s1;
this._shape2 = s2;
this._manifoldCount = 0;
this._prev = null;
this._next = null;
this._node1 = new ContactEdge();
this._node1.Contact = null;
this._node1.Prev = null;
this._node1.Next = null;
this._node1.Other = null;
this._node2 = new ContactEdge();
this._node2.Contact = null;
this._node2.Prev = null;
this._node2.Next = null;
this._node2.Other = null;
}
public SensorTest()
{
{
BodyDef bd = new BodyDef();
bd.Position.Set(0.0f, -10.0f);
Body ground = _world.CreateBody(bd);
PolygonDef sd = new PolygonDef();
sd.SetAsBox(50.0f, 10.0f);
ground.CreateShape(sd);
CircleDef cd = new CircleDef();
cd.IsSensor = true;
cd.Radius = 5.0f;
cd.LocalPosition.Set(0.0f, 20.0f);
_sensor = ground.CreateShape(cd);
}
{
CircleDef sd = new CircleDef();
sd.Radius = 1.0f;
sd.Density = 1.0f;
for (int i = 0; i < 7; ++i)
{
BodyDef bd = new BodyDef();
bd.Position.Set(-10.0f + 3.0f * i, 20.0f);
Body body = _world.CreateBody(bd);
body.CreateShape(sd);
body.SetMassFromShapes();
}
}
}
static void Distance(out DistanceOutput output, ref SimplexCache cache, ref DistanceInput input, Shape shapeA, Shape shapeB)
{
output = new DistanceOutput();
Transform transformA = input.TransformA;
Transform transformB = input.TransformB;
// Initialize the simplex.
Simplex simplex = new Simplex();
#if ALLOWUNSAFE
fixed (SimplexCache* sPtr = &cache)
{
simplex.ReadCache(sPtr, shapeA, transformA, shapeB, transformB);
}
#else
simplex.ReadCache(cache, shapeA, transformA, shapeB, transformB);
#endif
// Get simplex vertices as an array.
#if ALLOWUNSAFE
SimplexVertex* vertices = &simplex._v1;
#else
SimplexVertex[] vertices = new SimplexVertex[] { simplex._v1, simplex._v2, simplex._v3 };
#endif
// These store the vertices of the last simplex so that we
// can check for duplicates and prevent cycling.
#if ALLOWUNSAFE
int* lastA = stackalloc int[4], lastB = stackalloc int[4];
#else
int[] lastA = new int[4];
int[] lastB = new int[4];
#endif // ALLOWUNSAFE
int lastCount;
// Main iteration loop.
int iter = 0;
const int k_maxIterationCount = 20;
while (iter < k_maxIterationCount)
{
// Copy simplex so we can identify duplicates.
lastCount = simplex._count;
int i;
for (i = 0; i < lastCount; ++i)
{
lastA[i] = vertices[i].indexA;
lastB[i] = vertices[i].indexB;
}
switch (simplex._count)
{
case 1:
break;
case 2:
simplex.Solve2();
break;
case 3:
simplex.Solve3();
break;
default:
#if DEBUG
Box2DXDebug.Assert(false);
#endif
break;
}
// If we have 3 points, then the origin is in the corresponding triangle.
if (simplex._count == 3)
{
break;
}
// Compute closest point.
Vector2 p = simplex.GetClosestPoint();
float distanceSqr = p.sqrMagnitude;
// Ensure the search direction is numerically fit.
if (distanceSqr < Common.Settings.FLT_EPSILON_SQUARED)
{
// The origin is probably contained by a line segment
// or triangle. Thus the shapes are overlapped.
// We can't return zero here even though there may be overlap.
// In case the simplex is a point, segment, or triangle it is difficult
// to determine if the origin is contained in the CSO or very close to it.
break;
}
// Compute a tentative new simplex vertex using support points.
#if ALLOWUNSAFE
SimplexVertex* vertex = vertices + simplex._count;
vertex->indexA = shapeA.GetSupport(transformA.InverseTransformDirection(p));
vertex->wA = transformA.TransformPoint(shapeA.GetVertex(vertex->indexA));
//Vec2 wBLocal;
vertex->indexB = shapeB.GetSupport(transformB.InverseTransformDirection(-p));
vertex->wB = transformB.TransformPoint(shapeB.GetVertex(vertex->indexB));
vertex->w = vertex->wB - vertex->wA;
#else
SimplexVertex vertex = vertices[simplex._count - 1];
vertex.indexA = shapeA.GetSupport(transformA.InverseTransformDirection(p));
vertex.wA = transformA.TransformPoint(shapeA.GetVertex(vertex.indexA));
//Vec2 wBLocal;
vertex.indexB = shapeB.GetSupport(transformB.InverseTransformDirection(-p));
vertex.wB = transformB.TransformPoint(shapeB.GetVertex(vertex.indexB));
vertex.w = vertex.wB - vertex.wA;
#endif // ALLOWUNSAFE
// Iteration count is equated to the number of support point calls.
++iter;
// Check for convergence.
#if ALLOWUNSAFE
float lowerBound = Vector2.Dot(p, vertex->w);
#else
float lowerBound = Vector2.Dot(p, vertex.w);
#endif
float upperBound = distanceSqr;
const float k_relativeTolSqr = 0.01f * 0.01f; // 1:100
if (upperBound - lowerBound <= k_relativeTolSqr * upperBound)
{
// Converged!
break;
}
// Check for duplicate support points.
bool duplicate = false;
for (i = 0; i < lastCount; ++i)
{
#if ALLOWUNSAFE
if (vertex->indexA == lastA[i] && vertex->indexB == lastB[i])
#else
if (vertex.indexA == lastA[i] && vertex.indexB == lastB[i])
#endif
{
duplicate = true;
break;
}
}
// If we found a duplicate support point we must exit to avoid cycling.
if (duplicate)
{
break;
}
// New vertex is ok and needed.
++simplex._count;
}
#if ALLOWUNSAFE
fixed (DistanceOutput* doPtr = &output)
{
// Prepare output.
simplex.GetWitnessPoints(&doPtr->PointA, &doPtr->PointB);
doPtr->Distance = Vector2.Distance(doPtr->PointA, doPtr->PointB);
doPtr->Iterations = iter;
}
fixed (SimplexCache* sPtr = &cache)
{
// Cache the simplex.
simplex.WriteCache(sPtr);
}
#else
// Prepare output.
simplex.GetWitnessPoints(out output.PointA, out output.PointB);
output.Distance = Vector2.Distance(output.PointA, output.PointB);
output.Iterations = iter;
// Cache the simplex.
simplex.WriteCache(cache);
#endif
// Apply radii if requested.
if (input.UseRadii)
{
float rA = shapeA._radius;
float rB = shapeB._radius;
if (output.Distance > rA + rB && output.Distance > Common.Settings.FLT_EPSILON)
{
// Shapes are still no overlapped.
// Move the witness points to the outer surface.
output.Distance -= rA + rB;
Vector2 normal = output.PointB - output.PointA;
normal.Normalize();
output.PointA += rA * normal;
output.PointB -= rB * normal;
}
else
{
// Shapes are overlapped when radii are considered.
// Move the witness points to the middle.
Vector2 p = 0.5f * (output.PointA + output.PointB);
output.PointA = p;
output.PointB = p;
output.Distance = 0.0f;
}
}
}
internal void ReadCache(SimplexCache cache, Shape shapeA, Transform transformA, Shape shapeB, Transform transformB)
{
Box2DXDebug.Assert(0 <= cache.Count && cache.Count <= 3);
// Copy data from cache.
_count = cache.Count;
SimplexVertex[] vertices = new SimplexVertex[] { _v1, _v2, _v3 };
for (int i = 0; i < _count; ++i)
{
SimplexVertex v = vertices[i];
v.indexA = cache.IndexA[i];
v.indexB = cache.IndexB[i];
Vector2 wALocal = shapeA.GetVertex(v.indexA);
Vector2 wBLocal = shapeB.GetVertex(v.indexB);
v.wA = transformA.TransformPoint(wALocal);
v.wB = transformB.TransformPoint(wBLocal);
v.w = v.wB - v.wA;
v.a = 0.0f;
}
// Compute the new simplex metric, if it is substantially different than
// old metric then flush the simplex.
if (_count > 1)
{
float metric1 = cache.Metric;
float metric2 = GetMetric();
if (metric2 < 0.5f * metric1 || 2.0f * metric1 < metric2 || metric2 < Common.Settings.FLT_EPSILON)
{
// Reset the simplex.
_count = 0;
}
}
// If the cache is empty or invalid ...
if (_count == 0)
{
SimplexVertex v = vertices[0];
v.indexA = 0;
v.indexB = 0;
Vector2 wALocal = shapeA.GetVertex(0);
Vector2 wBLocal = shapeB.GetVertex(0);
v.wA = transformA.TransformPoint(wALocal);
v.wB = transformB.TransformPoint(wBLocal);
v.w = v.wB - v.wA;
_count = 1;
}
}
internal unsafe void ReadCache(SimplexCache* cache, Shape shapeA, Transform TransformA, Shape shapeB, Transform TransformB)
{
Box2DXDebug.Assert(0 <= cache->Count && cache->Count <= 3);
// Copy data from cache.
_count = cache->Count;
SimplexVertex** vertices = stackalloc SimplexVertex*[3];
fixed (SimplexVertex* v1Ptr = &_v1, v2Ptr = &_v2, v3Ptr = &_v3)
{
vertices[0] = v1Ptr;
vertices[1] = v2Ptr;
vertices[2] = v3Ptr;
for (int i = 0; i < _count; ++i)
{
SimplexVertex* v = vertices[i];
v->indexA = cache->IndexA[i];
v->indexB = cache->IndexB[i];
Vector2 wALocal = shapeA.GetVertex(v->indexA);
Vector2 wBLocal = shapeB.GetVertex(v->indexB);
v->wA = TransformA.TransformPoint(wALocal);
v->wB = TransformB.TransformPoint(wBLocal);
v->w = v->wB - v->wA;
v->a = 0.0f;
}
// Compute the new simplex metric, if it is substantially different than
// old metric then flush the simplex.
if (_count > 1)
{
float metric1 = cache->Metric;
float metric2 = GetMetric();
if (metric2 < 0.5f * metric1 || 2.0f * metric1 < metric2 || metric2 < Common.Settings.FLT_EPSILON)
{
// Reset the simplex.
_count = 0;
}
}
// If the cache is empty or invalid ...
if (_count == 0)
{
SimplexVertex* v = vertices[0];
v->indexA = 0;
v->indexB = 0;
Vector2 wALocal = shapeA.GetVertex(0);
Vector2 wBLocal = shapeB.GetVertex(0);
v->wA = TransformA.TransformPoint(wALocal);
v->wB = TransformB.TransformPoint(wBLocal);
v->w = v->wB - v->wA;
_count = 1;
}
}
}
private static void CollideCircles(ref Manifold manifold, Shape shape1, XForm xf1, Shape shape2, XForm xf2)
{
Collision.Collision.CollideCircles(ref manifold, (CircleShape)shape1, xf1, (CircleShape)shape2, xf2);
}
/// Creates a fixture from a shape and attach it to this body.
/// This is a convenience function. Use b2FixtureDef if you need to set parameters
/// like friction, restitution, user data, or filtering.
/// This function automatically updates the mass of the body.
/// @param shape the shape to be cloned.
/// @param density the shape density (set to zero for static bodies).
/// @warning This function is locked during callbacks.
public Fixture CreateFixture(Shape shape, float density)
{
FixtureDef def = new FixtureDef();
def.Shape = shape;
def.Density = density;
return CreateFixture(def);
}
public void Destroy(BroadPhase broadPhase)
{
// Remove proxy from the broad-phase.
if (ProxyId != BroadPhase.NullProxy)
{
broadPhase.DestroyProxy(ProxyId);
ProxyId = BroadPhase.NullProxy;
}
// Free the child shape.
switch (Shape.Type)
{
case ShapeType.CircleShape:
{
//CircleShape s = (CircleShape)Shape;
//s->~b2CircleShape();
//allocator->Free(s, sizeof(b2CircleShape));
}
break;
case ShapeType.PolygonShape:
{
//b2PolygonShape* s = (b2PolygonShape*)m_shape;
//s->~b2PolygonShape();
//allocator->Free(s, sizeof(b2PolygonShape));
}
break;
default:
Box2DXDebug.Assert(false);
break;
}
Shape = null;
}
/// <summary>
/// Performs a raycast as with Raycast, finding the first intersecting shape.
/// </summary>
/// <param name="segment">Defines the begin and end point of the ray cast, from p1 to p2.
/// Use Segment.Extend to create (semi-)infinite rays.</param>
/// <param name="lambda">Returns the hit fraction. You can use this to compute the contact point
/// p = (1 - lambda) * segment.p1 + lambda * segment.p2.</param>
/// <param name="normal">Returns the normal at the contact point. If there is no intersection, the normal is not set.</param>
/// <param name="solidShapes">Determines if shapes that the ray starts in are counted as hits.</param>
/// <param name="userData"></param>
/// <returns>Returns the colliding shape shape, or null if not found.</returns>
public Shape RaycastOne(Segment segment, out float lambda, out Vec2 normal, bool solidShapes, object userData)
{
lambda = 0;
normal = new Vec2(0,0);
int maxCount = 1;
Shape[] shape = new Shape[maxCount];
int count = Raycast(segment, shape, maxCount, solidShapes, userData);
if (count == 0)
return null;
Box2DXDebug.Assert(count == 1);
//Redundantly do TestSegment a second time, as the previous one's results are inaccessible
XForm xf = shape[0].GetBody().GetXForm();
shape[0].TestSegment(xf, out lambda, out normal, segment, 1);
//We already know it returns true
return shape[0];
}
/// <summary>
/// Mouse interaction event.
/// </summary>
public void MouseDown(Vec2 p)
{
if (_mouseJoint != null)
{
return;
}
// Make a small box.
AABB aabb = new AABB();
Vec2 d = new Vec2();
d.Set(0.001f, 0.001f);
aabb.LowerBound = p - d;
aabb.UpperBound = p + d;
// Query the world for overlapping shapes.
int k_maxCount = 10;
Shape[] shapes = new Shape[k_maxCount];
int count = _world.Query(aabb, shapes, k_maxCount);
Body body = null;
for (int i = 0; i < count; ++i)
{
Body shapeBody = shapes[i].GetBody();
if (shapeBody.IsStatic() == false && shapeBody.GetMass() > 0.0f)
{
bool inside = shapes[i].TestPoint(shapeBody.GetXForm(), p);
if (inside)
{
body = shapes[i].GetBody();
break;
}
}
}
if (body != null)
{
MouseJointDef md = new MouseJointDef();
md.Body1 = _world.GetGroundBody();
md.Body2 = body;
md.Target = p;
md.MaxForce = 1000.0f * body.GetMass();
md.FrequencyHz = 30f;
_mouseJoint = (MouseJoint)_world.CreateJoint(md);
body.WakeUp();
}
}
public ContactCB()
{
PolygonDef sd = new PolygonDef();
sd.Friction = 0;
sd.VertexCount = 3;
sd.Vertices[0].Set(10, 10);
sd.Vertices[1].Set(9, 7);
sd.Vertices[2].Set(10, 0);
_world.GetGroundBody().CreateShape(sd);
sd.Vertices[0].Set(9, 7);
sd.Vertices[1].Set(8, 0);
sd.Vertices[2].Set(10, 0);
_world.GetGroundBody().CreateShape(sd);
sd.Vertices[0].Set(9, 7);
sd.Vertices[1].Set(8, 5);
sd.Vertices[2].Set(8, 0);
_world.GetGroundBody().CreateShape(sd);
sd.Vertices[0].Set(8, 5);
sd.Vertices[1].Set(7, 4);
sd.Vertices[2].Set(8, 0);
_world.GetGroundBody().CreateShape(sd);
sd.Vertices[0].Set(7, 4);
sd.Vertices[1].Set(5, 0);
sd.Vertices[2].Set(8, 0);
_world.GetGroundBody().CreateShape(sd);
sd.Vertices[0].Set(7, 4);
sd.Vertices[1].Set(5, 3);
sd.Vertices[2].Set(5, 0);
_world.GetGroundBody().CreateShape(sd);
sd.Vertices[0].Set(5, 3);
sd.Vertices[1].Set(2, 2);
sd.Vertices[2].Set(5, 0);
_world.GetGroundBody().CreateShape(sd);
sd.Vertices[0].Set(2, 2);
sd.Vertices[1].Set(0, 0);
sd.Vertices[2].Set(5, 0);
_world.GetGroundBody().CreateShape(sd);
sd.Vertices[0].Set(2, 2);
sd.Vertices[1].Set(-2, 2);
sd.Vertices[2].Set(0, 0);
_world.GetGroundBody().CreateShape(sd);
sd.Vertices[2].Set(-2, 2);
sd.Vertices[1].Set(0, 0);
sd.Vertices[0].Set(-5, 0);
_world.GetGroundBody().CreateShape(sd);
sd.Vertices[2].Set(-5, 3);
sd.Vertices[1].Set(-2, 2);
sd.Vertices[0].Set(-5, 0);
_world.GetGroundBody().CreateShape(sd);
sd.Vertices[2].Set(-7, 4);
sd.Vertices[1].Set(-5, 3);
sd.Vertices[0].Set(-5, 0);
_world.GetGroundBody().CreateShape(sd);
sd.Vertices[2].Set(-7, 4);
sd.Vertices[1].Set(-5, 0);
sd.Vertices[0].Set(-8, 0);
_world.GetGroundBody().CreateShape(sd);
sd.Vertices[2].Set(-8, 5);
sd.Vertices[1].Set(-7, 4);
sd.Vertices[0].Set(-8, 0);
_world.GetGroundBody().CreateShape(sd);
sd.Vertices[2].Set(-9, 7);
sd.Vertices[1].Set(-8, 5);
sd.Vertices[0].Set(-8, 0);
_world.GetGroundBody().CreateShape(sd);
sd.Vertices[2].Set(-9, 7);
sd.Vertices[1].Set(-8, 0);
sd.Vertices[0].Set(-10, 0);
_world.GetGroundBody().CreateShape(sd);
sd.Vertices[2].Set(-10, 10);
sd.Vertices[1].Set(-9, 7);
sd.Vertices[0].Set(-10, 0);
_world.GetGroundBody().CreateShape(sd);
sd.SetAsBox(.5f, 6, new Vec2(10.5f, 6), 0);
_world.GetGroundBody().CreateShape(sd);
sd.SetAsBox(.5f, 6, new Vec2(-10.5f, 6), 0);
_world.GetGroundBody().CreateShape(sd);
BodyDef bd = new BodyDef();
bd.Position.Set(9.5f, 60);
Body _ball = _world.CreateBody(bd);
PolygonDef cd = new PolygonDef();
cd.VertexCount = 8;
float w = 1.0f;
float b = w / (2.0f + (float)System.Math.Sqrt(2.0f));
float s = (float)System.Math.Sqrt(2.0f) * b;
cd.Vertices[0].Set(0.5f * s, 0.0f);
cd.Vertices[1].Set(0.5f * w, b);
cd.Vertices[2].Set(0.5f * w, b + s);
cd.Vertices[3].Set(0.5f * s, w);
cd.Vertices[4].Set(-0.5f * s, w);
cd.Vertices[5].Set(-0.5f * w, b + s);
cd.Vertices[6].Set(-0.5f * w, b);
cd.Vertices[7].Set(-0.5f * s, 0.0f);
cd.Density = 1.0f;
_ball_shape = _ball.CreateShape(cd);
_ball.SetMassFromShapes();
}
private static void Collide(ref Manifold manifold, Shape shape1, XForm xf1, Shape shape2, XForm xf2) { }
public void OnContactRemove(Box2DX.Collision.Shape other, ContactPoint point)
{
}
new public static Contact Create(Shape shape1, Shape shape2)
{
return new PolygonContact(shape1, shape2);
}
public static new Contact Create(Shape shape1, Shape shape2)
{
return new CircleContact(shape1, shape2);
}
/// <summary> /// Called when any shape is about to be destroyed due /// to the destruction of its parent body. /// </summary> public abstract void SayGoodbye(Shape shape);
internal static void Destroy(Shape s)
{
switch (s.GetType())
{
case ShapeType.CircleShape:
{
if (s != null)
{
((IDisposable)s).Dispose();
}
s = null;
break;
}
case ShapeType.PolygonShape:
{
if (s != null)
{
((IDisposable)s).Dispose();
}
s = null;
break;
}
default:
{
Box2DXDebug.Assert(false);
break;
}
}
}
// We need separation create/destroy functions from the constructor/destructor because
// the destructor cannot access the allocator or broad-phase (no destructor arguments allowed by C++).
public void Create(BroadPhase broadPhase, Body body, Transform xf, FixtureDef def)
{
UserData = def.UserData;
Friction = def.Friction;
Restitution = def.Restitution;
Body = body;
_next = null;
Filter = def.Filter;
IsSensor = def.IsSensor;
Shape = def.Shape.Clone();
Shape.ComputeMass(out _massData, def.Density);
// Create proxy in the broad-phase.
Shape.ComputeAABB(out Aabb, ref xf);
ProxyId = broadPhase.CreateProxy(Aabb, this);
}
/// The constructor sets the default fixture definition values.
public FixtureDef()
{
Shape = null;
UserData = null;
Friction = 0.2f;
Restitution = 0.0f;
Density = 0.0f;
Filter.CategoryBits = 0x0001;
Filter.MaskBits = 0xFFFF;
Filter.GroupIndex = 0;
IsSensor = false;
}