/// <summary>
/// Update according to Gametime
/// </summary>
public override void Update(GameTime gameTime)
{
// No active behavior does not mean no mouvement
// but in case of a demo is much easier
if (!Active || !Behavior.HasActiveBehavior())
{
return;
}
double timeElapsed = gameTime.ElapsedGameTime.TotalSeconds;
// Wander need time elapsed to be time independant
Vector2 steeringForce = Behavior.Calculate(timeElapsed);
// Get acceleration using steering forces
Vector2 acceleration = Vector2.Divide(steeringForce, Mass);
// Update velocity using acceleration
Velocity += Vector2.Multiply(acceleration, (float)timeElapsed);
// Trim back velocity using extension method
Velocity = Velocity.TruncateExt(MaxSpeed);
// To avoid stange behavior when agent arrive
// update only if velocity is not too close to 0
if (Velocity.LengthSquared() > 0.00000001)
{
// Update internal values
UpdateOrientation();
UpdateLocalBase();
}
// Update position
Pos += Vector2.Multiply(Velocity, (float)timeElapsed);
// Make world toroidal
WrapAround(_world.GraphicsDevice.Viewport.Bounds);
}