public override void UpdateEntity(uint entity)
{
CPosition position = (CPosition)positions[entity];
CDimension dimension = (CDimension)dimensions[entity];
partitioner.Add(new PartitionerEntry(entity, position, dimension));
}
private VertexTransform CreateVertexTransform(CPosition position, CDimension dimension, CTransform transform)
{
Vector3 translation = new Vector3(position.X + transform.Translation.X, position.Y + transform.Translation.Y, position.Z + transform.Translation.Z);
Vector3 scale = new Vector3(dimension.Width * transform.Scale.X, dimension.Height * transform.Scale.Y, transform.Scale.Z);
return(new VertexTransform(translation, scale, transform.Origin, transform.Rotation));
}
public override void UpdateEntity(uint entity)
{
CPosition position = (CPosition)positions[entity];
CDimension dimension = (CDimension)dimensions[entity];
CTransform transform = (CTransform)transforms[entity];
CColor color = (CColor)colors[entity];
transformData[entity] = CreateVertexTransform(position, dimension, transform);
colorData[entity] = new VertexColor(color.Color);
}
private void Simulate(uint entity)
{
CPosition position = (CPosition)positions[entity];
CKinetic kinetic = (CKinetic)kinetics[entity];
kinetic.Accumulator += (float)(Engine.TotalGameTime - kinetic.LastUpdate).TotalSeconds;
kinetic.LastUpdate = new TimeSpan(Engine.TotalGameTime.Ticks);
while (kinetic.Accumulator >= target)
{
Integrate(position, kinetic, integrator, target);
kinetic.Accumulator -= target;
}
}
private void Integrate(CPosition position, CKinetic kinetic, Integrator integrator, float deltaTime)
{
switch (integrator)
{
case Integrator.SemiImplictEuler:
kinetic.Velocity += kinetic.Acceleration * deltaTime;
position.X += kinetic.Velocity.X * deltaTime;
position.Y += kinetic.Velocity.Y * deltaTime;
break;
case Integrator.VelocityVerlet:
position.X += kinetic.Velocity.X * deltaTime + 0.5f * kinetic.Acceleration.X * deltaTime * deltaTime;
position.Y += kinetic.Velocity.Y * deltaTime + 0.5f * kinetic.Acceleration.Y * deltaTime * deltaTime;
kinetic.Velocity += kinetic.Acceleration * deltaTime;
break;
}
}
public PartitionerEntry(uint entity, CPosition position, CDimension dimension)
{
Identifier = (int)entity;
Span = new RectangleF(position.X, position.Y, dimension.Width, dimension.Height);
}
