public void ShapesProperty()
{
var space = new Space();
var body = new Body(1, 1.66);
var body2 = new Body(1, 1.66);
var shape = new Box(body, 100, 100, 0);
var shape2 = new Box(body2, 100, 100, 0);
body.Position = new Vect(10, 10);
body.Position = new Vect(20, 20);
Assert.AreEqual(0, space.Shapes.Count, "#1");
space.AddBody(body);
space.AddShape(shape);
Shape[] shapes = space.Shapes.ToArray();
Assert.AreEqual(1, shapes.Length, "#2.1");
Assert.AreSame(shape, shapes[0], "#2.2");
space.AddBody(body2);
space.AddShape(shape2);
shapes = space.Shapes.ToArray();
Assert.AreEqual(2, shapes.Length, "#3.1");
Assert.AreSame(shape, shapes[0], "#3.2");
Assert.AreSame(shape2, shapes[1], "#3.3");
body.Dispose();
space.Dispose();
}
public void BodiesProperty()
{
var space = new Space();
var body = new Body(1, 1.66);
var body2 = new Body(1, 1.66);
body.Position = new Vect(10, 10);
body.Position = new Vect(20, 20);
Assert.AreEqual(0, space.Bodies.Count, "#1");
space.AddBody(body);
Body[] bodies = space.Bodies.ToArray();
Assert.AreEqual(1, bodies.Length, "#2.1");
Assert.AreSame(body, bodies[0], "#2.2");
space.AddBody(body2);
bodies = space.Bodies.ToArray();
Assert.AreEqual(2, bodies.Length, "#3.1");
Assert.AreSame(body, bodies[0], "#3.2");
Assert.AreSame(body2, bodies[1], "#3.3");
body.Dispose();
space.Dispose();
}
public void PositionUpdateFunctionCallback()
{
myUpdateFunctionDt = 0.0;
myUpdateFunctionBody = null;
var body = new Body(1, 1.66);
var space = new Space();
space.AddBody(body);
body.PositionUpdateFunction = MyPositionUpdateFunction;
body.Velocity = new Vect(10, 0);
space.Step(0.2);
Assert.True(calledMyPositionUpdateFunction, "#1");
Assert.AreSame(myUpdateFunctionBody, body, "#2");
Assert.AreEqual(0.2, myUpdateFunctionDt, "#3");
body.PositionUpdateFunction = null;
calledMyPositionUpdateFunction = false;
space.Step(0.2);
Assert.False(calledMyVelocityUpdateFunction, "#4");
space.Dispose();
}
public void SegmentTest()
{
var space = new Space();
var body = new Body(10, 224.037008503093);
var shape = new Segment(body, new Vect(1, 2), new Vect(3, 5), 2);
body.Position = new Vect(3, 2);
shape.Density = 10;
space.AddBody(body);
space.AddShape(shape);
Assert.AreEqual(new Vect(1, 2), shape.A, "#1");
Assert.AreEqual(new Vect(3, 5), shape.B, "#2");
Assert.AreEqual(2, shape.Radius, "#3");
Assert.AreEqual(0.832050294337844, shape.Normal.X, 0.00001, "#3");
Assert.AreEqual(-0.554700196225229, shape.Normal.Y, 0.00001, "#4");
double moment = shape.MomentForMass(10);
double area = shape.Area;
Assert.AreEqual(224.037008503093, moment, 0.0000001, "#5");
Assert.AreEqual(26.9885757162151, area, 0.0000001, "#6");
space.Dispose();
}
public void UnsafePolygon()
{
var space = new Space();
var body = new Body(10, 16.666);
Vect[] vertexs = { new Vect(-1, 0), new Vect(0, -1), new Vect(1, 0), new Vect(0, 1) };
var polygon = new Polygon(body, vertexs, 2.0);
space.AddBody(body);
space.AddShape(polygon);
Vect[] vertexs2 = { new Vect(-2, 0), new Vect(0, -2), new Vect(2, 0), new Vect(0, 2) };
polygon.SetVertexes(vertexs2);
for (int i = 0; i < vertexs.Length; i++)
{
Assert.AreEqual(vertexs2[i], polygon.GetVertex(i), "#2.1." + i);
}
polygon.SetRadius(1.33);
Assert.AreEqual(1.33, polygon.Radius, "#3");
space.Dispose();
}
public void BoundBoxQueryTest()
{
var space = new Space();
var body = new Body(1, 1.66);
var shape = new Box(body, 5, 5, 0);
var pos = new Vect(3, 3);
body.Position = pos;
var bb = new BoundingBox();
bb.Left = -20;
bb.Top = -20;
bb.Right = +20;
bb.Bottom = +20;
Shape[] shapes = space.BoundBoxQuery(bb, ShapeFilter.All).ToArray();
Assert.AreEqual(0, shapes.Length, "#1");
space.AddBody(body);
space.AddShape(shape);
space.ReindexShape(shape);
shapes = space.BoundBoxQuery(bb, ShapeFilter.All).ToArray();
Assert.AreEqual(1, shapes.Length, "#2");
Assert.AreSame(shape, shapes[0], "#3");
shape.Dispose();
body.Dispose();
space.Dispose();
}
public void SegmentQueryTest()
{
var space = new Space();
var body = new Body(1, 1.66);
var shape = new Box(body, 100, 100, 0);
body.Position = new Vect(0, 0);
var end = new Vect(0, 1);
SegmentQueryInfo[] infos = space.SegmentQuery(body.Position, end, 2.0, ShapeFilter.All).ToArray();
Assert.AreEqual(0, infos.Length, "#1");
space.AddBody(body);
space.AddShape(shape);
infos = space.SegmentQuery(body.Position, end, 2.0, ShapeFilter.All).ToArray();
SegmentQueryInfo first = space.SegmentQueryFirst(body.Position, end, 2.0, ShapeFilter.All);
Assert.AreEqual(1, infos.Length, "#2");
Assert.AreSame(shape, infos[0].Shape, "#3");
Assert.AreEqual(infos[0], first, "#4");
shape.Dispose();
body.Dispose();
space.Dispose();
}
public void PolygonTest()
{
var space = new Space();
var body = new Body(10, 3.33333333333333);
var body2 = new Body(10, 3.33333333333333);
Vect[] vertexs = { new Vect(-1, 0), new Vect(0, -1), new Vect(1, 0), new Vect(0, 1) };
var polygon = new Polygon(body, vertexs, 2.0);
var polygon2 = new Polygon(body2, vertexs, Transform.Identity, 1.0);
space.AddBody(body);
space.AddShape(polygon);
space.AddBody(body2);
space.AddShape(polygon2);
double area = polygon.Area;
double area2 = polygon.Area;
Assert.AreEqual(25.8800791133439, area, 0.000001, "#0.1");
Assert.AreEqual(25.8800791133439, area2, 0.000001, "#0.1");
Assert.IsTrue(vertexs.SequenceEqual(polygon.Vertices), "#0");
Assert.AreEqual(vertexs.Length, polygon.Count, "#1");
Assert.AreEqual(vertexs.Length, polygon2.Count, "#1.1");
for (int i = 0; i < vertexs.Length; i++)
{
Assert.AreEqual(vertexs[i], polygon.GetVertex(i), "#2.1." + i);
Assert.AreEqual(vertexs[i], polygon2.GetVertex(i), "#2.2." + i);
}
Assert.AreEqual(2.0, polygon.Radius, "#3.1");
Assert.AreEqual(1.0, polygon2.Radius, "#3.1");
Assert.AreEqual(Vect.Zero, polygon.Centroid, "#3");
double moment = Polygon.MomentForPolygon(body.Mass, polygon.Vertices, Vect.Zero, polygon.Radius);
Assert.AreEqual(3.33333333333333, moment, 0.0000001, "#4");
space.Dispose();
}
public void MiscPropertyTest()
{
var space = new Space();
var body = new Body(10, 16.666);
var shape = new Box(body, 2, 2, 0);
body.Position = new Vect(3, 2);
shape.Density = 10;
space.AddBody(body);
space.AddShape(shape);
Assert.AreEqual(10, shape.Density, "#1");
double moment = shape.Moment;
Assert.AreEqual(26.666666666, moment, 0.0000001, "#2");
double area = shape.Area;
Assert.AreEqual(4, area, "#3");
Vect center = shape.CenterOfGravity;
Assert.AreEqual(new Vect(0, 0), center, "#4");
BoundingBox boundBox = shape.BoundingBox;
Assert.AreEqual(new BoundingBox(2, 1, 4, 3), boundBox, "#5");
bool sensor = shape.Sensor;
Assert.AreEqual(false, sensor, "#6");
shape.Sensor = true;
Assert.AreEqual(true, shape.Sensor, "#6.1");
shape.Elasticity = 0.7;
Assert.AreEqual(0.7, shape.Elasticity, "#7");
shape.Friction = 0.4;
Assert.AreEqual(0.4, shape.Friction, "#8");
shape.SurfaceVelocity = new Vect(-1, 2);
Assert.AreEqual(new Vect(-1, 2), shape.SurfaceVelocity, "#9");
shape.CollisionType = 13;
Assert.AreEqual(13, shape.CollisionType, "#10");
ShapeFilter filter = shape.Filter;
shape.Filter = ShapeFilter.All;
Assert.AreEqual(ShapeFilter.All, shape.Filter, "#11");
space.Dispose();
}
public void SetUp()
{
space = new Space();
bodyA = new Body(1, 1.666);
shapeA = new Box(bodyA, 2, 2, 0);
bodyB = new Body(2, 3.222);
shape2 = new Box(bodyB, 3, 3, 0);
bodyA.Position = new Vect(2, 1);
bodyB.Position = new Vect(3, 2);
space.AddBody(bodyA);
space.AddShape(shapeA);
space.AddBody(bodyB);
space.AddShape(shape2);
}
public void SpaceProperty()
{
var space = new Space();
var body = new Body(1, 1.66);
Assert.IsNull(body.Space, "#1");
space.AddBody(body);
Assert.AreSame(space, body.Space, "#2");
body.Dispose();
space.Dispose();
}
public void CollideTest()
{
var space = new Space();
var body = new Body(1, 1.66);
var shape = new Box(body, 2, 2, 0);
var body2 = new Body(1, 1.66);
var shape2 = new Box(body2, 3, 3, 0);
body.Position = new Vect(2, 1);
body2.Position = new Vect(3, 2);
space.AddBody(body);
space.AddShape(shape);
space.AddBody(body2);
space.AddShape(shape2);
ContactPointSet pointSet = shape.Collide(shape2);
Assert.AreEqual(2, pointSet.Count, "#1");
Assert.AreEqual(new Vect(0, 1), pointSet.Normal, "#2");
Assert.AreEqual(2, pointSet.Points.Count, "#3.0");
Assert.AreEqual(new Vect(3, 2), pointSet.Points[0].PointA, "#3.1");
Assert.AreEqual(new Vect(3, 0.5), pointSet.Points[0].PointB, "#3.2");
Assert.AreEqual(-1.5, pointSet.Points[0].Distance, "#3.3");
Assert.AreEqual(new Vect(1.5, 2), pointSet.Points[1].PointA, "#4.1");
Assert.AreEqual(new Vect(1.5, 0.5), pointSet.Points[1].PointB, "#4.2");
Assert.AreEqual(-1.5, pointSet.Points[1].Distance, "#4.3");
space.Dispose();
}
public void SpaceTest()
{
var space = new Space();
var body = new Body(1, 1.66);
var shape = new Box(body, 2, 2, 0);
Assert.IsNull(shape.Space, "#1");
space.AddBody(body);
space.AddShape(shape);
Assert.AreSame(space, shape.Space, "#2");
space.Dispose();
}
void AddBox(Space space)
{
const double size = 10.0;
const double mass = 1.0;
Vect[] verts =
{
new Vect(-size, -size),
new Vect(-size, size),
new Vect(size, size),
new Vect(size, -size)
};
double radius = verts[0].Length();
Vect position = RandPosition(radius);
var body = new Body(mass, Polygon.MomentForPolygon(mass, verts, Vect.Zero, 0.0));
space.AddBody(body);
body.VelocityUpdateFunction = planetGravityFunctionCallback;
body.Position = position;
// Set the box's velocity to put it into a circular orbit from its
// starting position.
double r = position.Length();
double v = Math.Sqrt(gravityStrength / r) / r;
body.Velocity = position.Perpendicurlar * v;
// Set the box's angular velocity to match its orbital period and
// align its initial angle with its position.
body.AngularVelocity = v;
body.Angle = Math.Atan2(position.Y, position.X);
var shape = new Polygon(body, verts, Transform.Identity, 0.0);
space.AddShape(shape);
shape.Elasticity = 0.0;
shape.Friction = 0.7;
}
public void ContainsRemove()
{
var space = new Space();
var body = new Body(1, 1.66);
Assert.IsFalse(space.Contains(body), "#1");
space.AddBody(body);
Assert.IsTrue(space.Contains(body), "#2");
space.RemoveBody(body);
Assert.IsFalse(space.Contains(body), "#3");
body.Dispose();
space.Dispose();
}
public void UnsafeSegment()
{
var space = new Space();
var body = new Body(10, 16.666);
var shape = new Segment(body, new Vect(1, 2), new Vect(3, 5), 2);
body.Position = new Vect(3, 2);
shape.Density = 10;
space.AddBody(body);
space.AddShape(shape);
shape.SetEndpoints(new Vect(2, 4), new Vect(6, 2));
shape.SetRadius(3);
Assert.AreEqual(new Vect(2, 4), shape.A, "#1");
Assert.AreEqual(new Vect(6, 2), shape.B, "#2");
Assert.AreEqual(3, shape.Radius, "#3");
}
[Ignore("TODO: ShapeQuery test better")] // TODO: ShapeQuery test better
public void ShapeQueryTest()
{
var space = new Space();
var body = new Body(1, 1.66);
var shape = new Box(body, 1, 1, 0);
body.Position = new Vect(0, 0);
ContactPointSet[] pointSet = space.ShapeQuery(shape).ToArray();
Assert.AreEqual(0, pointSet.Length, "#1");
space.AddBody(body);
space.AddShape(shape);
pointSet = space.ShapeQuery(shape).ToArray();
Assert.AreEqual(1, pointSet.Length, "#2");
shape.Dispose();
body.Dispose();
space.Dispose();
}
public void DebugDrawTest()
{
var space = new Space();
var body = new Body(1, 1.66);
var shape = new Box(body, 100, 100, 0);
string expected_calls = "DrawPolygon\nvectors[0] = (50,-50)\nvectors[1] = (50,50)\nvectors[2] = (-50,50)\nvectors[3] = (-50,-50)\nradius = 0\noutlineColor = (1,1,1,1)\nfillColor = (0,0,1,1)\n";
body.Position = new Vect(0, 0);
space.AddBody(body);
space.AddShape(shape);
var debugDraw = new FakeDebugDraw();
space.DebugDraw(debugDraw);
Assert.AreEqual(expected_calls, debugDraw.TracedCalls, "#1");
shape.Dispose();
body.Dispose();
space.Dispose();
}
public void UnsafeCircle()
{
var space = new Space();
var body = new Body(10, 16.666);
var shape = new Circle(body, 2, new Vect(3, 5));
body.Position = new Vect(3, 2);
shape.Density = 10;
space.AddBody(body);
space.AddShape(shape);
Assert.AreEqual(new Vect(3, 5), shape.Offset, "#1");
Assert.AreEqual(2, shape.Radius, "#2");
shape.SetOffset(new Vect(10, 13));
shape.SetRadius(4);
Assert.AreEqual(new Vect(10, 13), shape.Offset, "#3");
Assert.AreEqual(4, shape.Radius, "#4");
space.Dispose();
}
public void CircleOffset()
{
var space = new Space();
var body = new Body(10, 360);
var shape = new Circle(body, 2, new Vect(3, 5));
body.Position = new Vect(3, 2);
shape.Density = 10;
space.AddBody(body);
space.AddShape(shape);
Assert.AreEqual(new Vect(3, 5), shape.Offset, "#1");
Assert.AreEqual(2, shape.Radius, "#2");
double moment = shape.MomentForMass(10);
double area = shape.Area;
Assert.AreEqual(360, moment, "#3");
Assert.AreEqual(12.5663706143592, area, 0.00001, "#4");
space.Dispose();
}
public void PointQueryTest()
{
var space = new Space();
var body = new Body(1, 1.66);
var shape = new Box(body, 100, 100, 0);
body.Position = new Vect(0, 0);
PointQueryInfo[] infos = space.PointQuery(body.Position, 10.0, ShapeFilter.All).ToArray();
Assert.AreEqual(0, infos.Length, "#1");
space.AddBody(body);
space.AddShape(shape);
infos = space.PointQuery(body.Position, 10.0, ShapeFilter.All).ToArray();
Assert.AreEqual(1, infos.Length, "#2");
Assert.AreSame(shape, infos[0].Shape, "#3");
shape.Dispose();
body.Dispose();
space.Dispose();
}
/// <seealso cref="Silver.Weight.Raw.BroadCollisionStrategy.CollideBodies(Silver.Weight.Raw.CollisionContext, Silver.Weight.Raw.BodyList, float)">
/// </seealso>
public virtual void CollideBodies(CollisionContext context, BodyList bodies, float dt)
{
spaces.Clear();
Space space = new Space( 0, 0, 0, 0);
for (int i = 0; i < bodies.Size(); i++)
{
Body body = bodies.Item(i);
space.AddAABox(body.Shape.Bounds, body.GetPosition().X, body.GetPosition().Y);
space.AddBody(body);
}
SplitSpace(space, 0, maxInSpace, spaces);
for (int i = 0; i < spaces.Count; i++)
{
context.Resolve((Space) spaces[i], dt);
}
}
public void TestCollisionHandler()
{
var space = new Space();
space.CollisionBias = 1.0;
float radius = 5.0f;
var body1 = new Body(1, 1)
{
Position = new Vect(0 * radius * 1.5, 0)
};
space.AddBody(body1);
space.AddShape(new Circle(body1, radius));
var body2 = new Body(1, 1)
{
Position = new Vect(0 * radius * 1.5, 0)
};
space.AddBody(body2);
var shape2 = new Circle(body2, radius);
space.AddShape(shape2);
CollisionHandler <StringBuilder> handler = space.GetOrCreateCollisionHandler <StringBuilder>(0, 0);
CollisionHandler <StringBuilder> handler2 = space.GetOrCreateCollisionHandler <StringBuilder>(0, 0);
Assert.AreSame(handler, handler2, "#0");
handler.Data = new StringBuilder();
handler.Begin = (a, s, builder) =>
{
builder.Append("Begin-");
return(true);
};
handler.PreSolve = (a, s, builder) =>
{
builder.Append("PreSolve-");
return(true);
};
handler.PostSolve = (a, s, builder) => builder.Append("PostSolve-");
handler.Separate = (a, s, builder) => builder.Append("Separete-");
space.Step(0.1);
Assert.AreEqual("Begin-PreSolve-PostSolve-", handler.Data.ToString(), "#1");
space.Step(0.1);
Assert.AreEqual("Begin-PreSolve-PostSolve-PreSolve-PostSolve-", handler.Data.ToString(), "#2");
shape2.Dispose();
body1.Dispose();
body2.Dispose();
space.Dispose();
}
public void TestArbiterProperties()
{
Space space;
using (space = new Space())
{
space.CollisionBias = 1.0;
float radius = 5.0f;
var body1 = new Body(1, 1.666)
{
Position = new Vect(0 * radius * 1.5, 0)
};
space.AddBody(body1);
Shape shape = new Circle(body1, radius);
space.AddShape(shape);
var body2 = new Body(1, 1.666)
{
Position = new Vect(0 * radius * 1.5, 0)
};
space.AddBody(body2);
var shape2 = new Circle(body2, radius);
space.AddShape(shape2);
CollisionHandler <object> handler = space.GetOrCreateCollisionHandler(0, 0);
handler.Data = "object data";
Body bodyA = null;
Body bodyB = null;
Shape shapeA = null;
Shape shapeB = null;
double restituition = -1;
double fricction = -1;
Vect surfaceVelocity = new Vect(-1, -1);
Vect totalImpulse = new Vect(-1, -1);
double ke = -1;
ContactPointSet pointSet = null;
bool first = false;
bool removal = true;
int count = -1;
Vect normal = new Vect(-1, -1);
Vect pointA = new Vect(-1, -1);
Vect pointB = new Vect(-1, -1);
double depth = -1;
var arb = default(Arbiter);
handler.Begin = (arbiter, s, obj) =>
{
Assert.IsNull(arbiter.Data, "arbiter.Data");
arbiter.Data = "another data";
arbiter.GetBodies(out bodyA, out bodyB);
arbiter.GetShapes(out shapeA, out shapeB);
restituition = arbiter.Restitution;
fricction = arbiter.Friction;
surfaceVelocity = arbiter.SurfaceVelocity;
totalImpulse = arbiter.TotalImpulse;
ke = arbiter.TotalKE;
pointSet = arbiter.ContactPointSet;
first = arbiter.IsFirstContact;
removal = arbiter.IsRemoval;
count = arbiter.Count;
normal = arbiter.Normal;
pointA = arbiter.GetPointA(0);
pointB = arbiter.GetPointB(0);
depth = arbiter.GetDepth(0);
arb = arbiter;
return(true);
};
space.Step(0.1);
Assert.AreSame(body2, bodyA, "#1");
Assert.AreSame(body1, bodyB, "#1.1");
var arbiters = bodyA.Arbiters;
Assert.AreEqual(1, arbiters.Count, "#0");
Assert.AreEqual(arb, arbiters[0], "#0.1");
Assert.AreEqual("another data", arbiters[0].Data, "#0.2");
Assert.AreSame(shape2, shapeA, "#2");
Assert.AreSame(shape, shapeB, "#2.1");
Assert.AreEqual(0, restituition, 0.00001, "#3");
Assert.AreEqual(0, fricction, 0.00001, "#4");
Assert.AreEqual(Vect.Zero, surfaceVelocity, "#5");
Assert.AreEqual(Vect.Zero, totalImpulse, "#6");
Assert.AreEqual(double.NaN, ke, "#7");
Assert.AreEqual(1, pointSet.Count, "8.1");
Assert.AreEqual(new Vect(1, 0), pointSet.Normal, "8.2");
Assert.AreEqual(-10, pointSet.Points[0].Distance, 0.00001, "8.3");
Assert.AreEqual(new Vect(5, 0), pointSet.Points[0].PointA, "8.4");
Assert.AreEqual(new Vect(-5, 0), pointSet.Points[0].PointB, "8.5");
Assert.AreEqual(0, pointSet.Points[1].Distance, 0.00001, "8.6");
Assert.AreEqual(new Vect(0, 0), pointSet.Points[1].PointA, "8.7");
Assert.AreEqual(new Vect(0, 0), pointSet.Points[1].PointB, "8.8");
Assert.IsTrue(first, "#9");
Assert.IsFalse(removal, "#10");
Assert.AreEqual(1, count, "#11");
Assert.AreEqual(new Vect(1, 0), normal, "#12");
Assert.AreEqual(new Vect(5, 0), pointA, "#13");
Assert.AreEqual(new Vect(-5, 0), pointB, "#14");
Assert.AreEqual(-10, depth, 0.00001, "#15");
}
}
public Space Initialize()
{
space = new Space();
space.Iterations = 30;
space.Gravity = new Vect(0, -100);
space.SleepTimeThreshold = 0.5f;
space.CollisionSlop = 0.5f;
Body body;
Body staticBody = space.StaticBody;
Shape shape = new Segment(staticBody, new Vect(-320, -240), new Vect(-320, 240), 0.0f);
space.AddShape(shape);
obj.Add(shape);
shape.Elasticity = 1.0f;
shape.Friction = 1.0f;
shape.Filter = NotGrabbableFilter;
shape = new Segment(staticBody, new Vect(320, -240), new Vect(320, 240), 0.0f);
space.AddShape(shape);
obj.Add(shape);
shape.Elasticity = 1.0f;
shape.Friction = 1.0f;
shape.Filter = NotGrabbableFilter;
shape = new Segment(staticBody, new Vect(-320, -240), new Vect(320, -240), 0.0f);
space.AddShape(shape);
obj.Add(shape);
shape.Elasticity = 1.0f;
shape.Friction = 1.0f;
shape.Filter = NotGrabbableFilter;
// Add lots of boxes.
for (int i = 0; i < 14; i++)
{
for (int j = 0; j <= i; j++)
{
body = new Body(1.0f, Box.MomentForBox(1.0f, 30.0f, 30.0f));
space.AddBody(body);
obj.Add(body);
body.Position = new Vect(j * 32 - i * 16, 300 - i * 32);
shape = new Box(body, 30.0f, 30.0f, 0.5f);
space.AddShape(shape);
obj.Add(shape);
shape.Elasticity = 0.0f;
shape.Friction = 0.8f;
}
}
// Add a ball to make things more interesting
double radius = 15.0f;
body = new Body(10.0f, Circle.MomentForCircle(10.0f, 0.0f, radius, Vect.Zero));
space.AddBody(body);
obj.Add(body);
body.Position = new Vect(0, -240 + radius + 5);
shape = new Circle(body, radius);
space.AddShape(shape);
obj.Add(shape);
shape.Elasticity = 0.0f;
shape.Friction = 0.9f;
return(space);
}