public static SpatialGrid GetInstance()
{
if (instance == null)
{
instance = new SpatialGrid(0, 0, 1);
}
return(instance);
}
public void SetDimensions(int gridWidth, int gridHeight, float gridSize)
{
if (setup)
{
throw new Exception("Dimensions already set!");
}
instance = new SpatialGrid(gridWidth, gridHeight, gridSize);
instance.setup = true;
}
/// <summary>
/// Rotates the shape
/// </summary>
/// <param name="angle">Number of degrees to rotate</param>
protected void Rotate(float angle)
{
SpatialGrid.GetInstance().RemoveObject(this);
for (int i = 0; i < sourceVertices.Length; i++)
{
sourceVertices[i] = RotateAroundPoint(sourceVertices[i], centre, Vector3.Backward, angle);
}
BoundingBox = new BoundingRectangle(sourceVertices);
TriangulatePoly();
SpatialGrid.GetInstance().AddObject(this);
}
public void initSimulation()
{
theParticles = new List <BlobParticle>();
theSprings = new List <Spring>();
//TODO: SHOULD BE DONE SOMEWHERE ELSE!!!
SpatialGrid.GetInstance().SetDimensions(800, 600, disconnectThreshold);
connected = new Spring[maxParticles + 1][];
for (int i = 0; i < maxParticles; i++)
{
connected[i] = new Spring[maxParticles + 1];
}
}
public override void Draw()
{
SpatialGrid.GetInstance().RemoveObject(this);
// Apply Velocity
for (int i = 0; i < sourceVertices.Length; i++)
{
sourceVertices[i] += this.velocity;
}
BoundingBox = new BoundingRectangle(sourceVertices);
TriangulatePoly();
SpatialGrid.GetInstance().AddObject(this);
// Call Parent Draw Methods
base.Draw();
}
public void addParticles(int num)
{
for (int i = 0; i < num; i++)
{
Random RandomGenerator = new Random();
float randomXVelocity = 5;
Vector2 mousePos = camera.MouseToWorld();
float xPos = mousePos.X;
float yPos = mousePos.Y;
if (xPos < drawingOffset)
{
xPos = drawingOffset + 1;
}
else if (xPos > 800 - drawingOffset)
{
xPos = 800 - drawingOffset - 1;
}
if (yPos < 0)
{
yPos = 1;
}
else if (yPos > 500)
{
yPos = 499;
}
BlobParticle theParticle = new BlobParticle(Game, new Vector2(xPos, yPos), theSprite, PhysicsOverlord.GetInstance().GetID(), particleRadius);
theParticle.colour = Color.Red;
theParticle.velocity = new Vector2(5, 5);
theParticles.Add(theParticle);
SpatialGrid.GetInstance().AddObject(theParticle);
particleCount++;
currentNumParticles--;
}
}
/*
* Currently Being Performed in a ... really odd fashion
*/
public virtual void UpdatePoint()
{
doCollisionCheck();
oldPosition = Position;
SpatialGrid.GetInstance().RemoveObject(this);
velocity += force;
if (IKPoint != null)
{
IKPoint.update();
}
velocity *= 0.95f;
Position += velocity;
if (Position.Y > 500)
{
Position.Y = 500;
velocity.Y = 0;
}
else if (Position.Y < 0)
{
Position.Y = 0;
velocity.Y = 0;
}
if (Position.X > 800)
{
Position.X = 800;
velocity.X *= -0.5f;
}
else if (Position.X < 0)
{
Position.X = 0;
velocity.X *= -0.5f;
}
SpatialGrid.GetInstance().AddObject(this);
}
public void moveParticles()
{
BlobParticle theParticle;
PhysicsObject neighbourObject;
Vector2 differenceVector;
int neighourCount;
int j;
float distance;
List <PhysicsObject> neighbours;
for (int i = 0; i < particleCount; i++)
{
theParticle = theParticles[i];
SpatialGrid.GetInstance().RemoveObject(theParticle);
theParticle.oldPosition = theParticle.Position;
theParticle.Position += theParticle.velocity;
// Apply Gravity
theParticle.applyForce(gravity);
simpleCollisionDetection(theParticle);
SpatialGrid.GetInstance().AddObject(theParticle);
//BEGIN CHECK SPRINGS
neighbours = SpatialGrid.GetInstance().GetNeighbours(theParticle);
neighourCount = neighbours.Count;
for (j = 0; j < neighourCount; j++)
{
neighbourObject = neighbours[j];
// If PARTICLE
if (neighbourObject.type == PhysicsObjectType.potBlobParticle)
{
differenceVector = theParticle.Position - ((BlobParticle)neighbourObject).Position;
distance = differenceVector.Length();
if (distance <= threshold && connected[theParticle.id][((BlobParticle)neighbourObject).id] == null)
{
theParticle.addNeighbour(((BlobParticle)neighbourObject));
((BlobParticle)neighbourObject).addNeighbour(theParticle);
connected[theParticle.id][((BlobParticle)neighbourObject).id] = new Spring(theParticle, ((BlobParticle)neighbourObject), springStiffness, springLength, springFriction);
}
else if (distance > disconnectThreshold && connected[theParticle.id][((BlobParticle)neighbourObject).id] != null)
{
theParticle.removeNeighbour(((BlobParticle)neighbourObject));
((BlobParticle)neighbourObject).removeNeighbour(theParticle);
connected[theParticle.id][((BlobParticle)neighbourObject).id] = null;
}
if (connected[theParticle.id][((BlobParticle)neighbourObject).id] != null)
{
//connected[theParticle.id][neighbourParticle.id].viscoSolve();
connected[theParticle.id][((BlobParticle)neighbourObject).id].solve();
}
}
else if (neighbourObject.type == PhysicsObjectType.potStaticBody)
{
// IF STATIC BODY
Vector2 result;
if ((result = ((StaticBody)neighbourObject).Collides(theParticle)) != Vector2.Zero)
{
// Collision Code from 'Devin Horsman' Message
float kr = 0.5f;
float friction = 1f;
//Vector2 tempVel = theParticle.oldPosition - theParticle.Position;
Vector2 tempVel = theParticle.velocity;
Vector2 velocityN = Vector2.Dot(tempVel, result) * result;
Vector2 velocityT = tempVel - velocityN;
// Check if object is moving towards wall.
//if (Vector2.Dot(theParticle.velocity, result) < 0)
//{
SpatialGrid.GetInstance().RemoveObject(theParticle);
// No Friction
Vector2 newVel = velocityT - kr * velocityN;
// Fake Friction
/*Vector2 newVTan = Vector2.Max(Vector2.Zero, velocityT - velocityT * friction);
* Vector2 newVel = newVTan + kr * velocityN;*/
theParticle.velocity = newVel;
theParticle.Position = theParticle.oldPosition;
float check = Vector2.Dot(tempVel, result);
//if (check < theParticle.radius/2)
//{
Vector2 contactForce = -Vector2.Dot(result, theParticle.velocity) * result;
//theParticle.applyForce(contactForce);
theParticle.velocity = contactForce;
//}
// Friction
//if (velocityT > new Vector2(5,5))
//{
//Vector2 frictionForce = -friction * Vector2.Dot(-result, theParticle.velocity) * velocityT;
//theParticle.applyForce(frictionForce);
//}
SpatialGrid.GetInstance().AddObject(theParticle);
//}
}
}
}
//END CHECK SPRINGS
}
}
public override void NewBody(PhysicsObject newbody)
{
bodies.Add(newbody.id, newbody);
SpatialGrid.GetInstance().AddObject(newbody);
}
public void doCollisionCheck()
{
List <PhysicsObject> neighbours;
PhysicsObject neighbourObject;
int neighbourCount;
int particleCount = 0;
neighbours = SpatialGrid.GetInstance().GetPNeighbours(this);
neighbourCount = neighbours.Count;
for (int j = 0; j < neighbourCount; j++)
{
neighbourObject = neighbours[j];
// IF STATIC BODY
Vector2 result;
if (neighbourObject.type == PhysicsObjectType.potStaticBody)
{
if ((result = ((StaticBody)neighbourObject).Collides(this)) != Vector2.Zero)
{
// ATTEMPTED NEW COLLISION CODE
float kr = 0f;
float friction = 1f;
Vector2 tempVel = this.velocity;
//Vector2 tempVel = this.velocity;
Vector2 velocityN = Vector2.Dot(tempVel, result) * result;
Vector2 velocityT = tempVel - velocityN;
// Check if object is moving towards wall.
//if (Vector2.Dot(tempVel, result) < 0)
//{
SpatialGrid.GetInstance().RemoveObject(this);
// No Friction
//Vector2 newVel = velocityT - kr * velocityN;
// Fake Friction
Vector2 newVTan = Vector2.Max(Vector2.Zero, velocityT - velocityT * friction);
Vector2 newVel = newVTan + kr * velocityN;
this.velocity = newVel;
this.Position = this.oldPosition;
//if (Vector2.Dot(tempVel, result) < 1)
//{
Vector2 contactForce = -(Vector2.Dot(result, Position - oldPosition) * result);
//this.velocity = contactForce;
this.ApplyForce(contactForce);
//}
this.Position += this.velocity;
SpatialGrid.GetInstance().AddObject(this);
//}
//status = ParasiteStatus.crawling;
}
}
else if (neighbourObject.type == PhysicsObjectType.potBlobParticle)
{
// IF COLLIDING : DISABLE GRAVITY
relativeGravity = new Vector2(0, 1.5f);
particleCount++;
}
else
{
// relativeGravity = new Vector2(0, 0.9f);
}
}
if (particleCount == 0)
{
relativeGravity = new Vector2(0, 0.9f);
status = ParasiteStatus.crawling;
}
else
{
this.velocity *= 0.93f;
status = ParasiteStatus.swimming;
}
}
