public List <PhysicsObject> GetNeighbours(BlobParticle particle)
{
if (!setup)
{
throw new Exception("SetDimensions must be called first!");
}
int x = (int)(particle.Position.X / gridSize);
int y = (int)(particle.Position.Y / gridSize);
List <PhysicsObject> returnList = new List <PhysicsObject>(100);
/*for (int i = x - (x == 0 ? 0 : 1); i <= x + (x == width + 1 ? 0 : 1); i++)
* {
* for (int j = y - (y == 0 ? 0 : 1); j <= y + (y == height + 1 ? 0 : 1); j++)
* {
* returnList.AddRange(grid[i][j]);
* }
* }*/
int xStart = x - 1;
int xEnd = x + 1;
int yStart = y - 1;
int yEnd = y + 1;
if (xStart <= 0)
{
xStart = 0;
}
if (xEnd >= width)
{
xEnd = width;
}
if (yStart <= 0)
{
yStart = 0;
}
if (yEnd >= height)
{
yEnd = height;
}
for (int i = xStart; i <= xEnd; i++)
{
for (int j = yStart; j <= yEnd; j++)
{
returnList.AddRange(grid[i][j].Values);
}
}
returnList.Remove(particle);
return(returnList);
}
public Spring(BlobParticle object1, BlobParticle object2, float springConstant, float springLength, float frictionConstant)
{
this.object1 = object1;
this.object2 = object2;
this.springConstant = springConstant;
this.springLength = springLength;
this.frictionConstant = frictionConstant;
}
public float CalculateFieldStrength(BlobParticle particle, Vector2 point)
{
float fieldStrength = 0.0f;
float distance = Vector2.Distance(particle.Position, point);
if (distance < particle.radiusSquared)
{
fieldStrength = 1.0f;
}
return(fieldStrength);
}
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--;
}
}
private void simpleCollisionDetection(BlobParticle theParticle)
{
if (theParticle.Position.X < 0 + drawingOffset)
{
theParticle.velocity.X *= -0.5f;
if (theParticle.velocity.X < 2.0f && theParticle.velocity.X > -2.0f)
{
theParticle.velocity.X = 0.0f;
}
theParticle.Position.X = 0 + drawingOffset;
}
else if (theParticle.Position.X > 800 - drawingOffset)
{
theParticle.velocity.X *= -0.5f;
if (theParticle.velocity.X < 2.0f && theParticle.velocity.X > -2.0f)
{
theParticle.velocity.X = 0.0f;
}
theParticle.Position.X = 800 - drawingOffset;
}
if (theParticle.Position.Y < 0)
{
theParticle.velocity.Y *= -0.5f;
theParticle.Position.Y = 1;
}
else if (theParticle.Position.Y > 500)
{
theParticle.velocity.Y *= -0.5f;
if (theParticle.velocity.Y < 2.0f && theParticle.velocity.Y > -2.0f)
{
theParticle.velocity.Y = 0.0f;
}
theParticle.Position.Y = 500;
}
}
public void removeNeighbour(BlobParticle theNeighbour)
{
neighbours.Remove(theNeighbour);
}
public void addNeighbour(BlobParticle theNeighbour)
{
neighbours.Add(theNeighbour);
}