public Vector2 Update(Vehicle vehicle, GameTime gameTime)
{
_currentWanderAngle += RateOfChangeOfDirection * (float) (_random.NextDouble() * 2 - 1);
_lastDirectionChangeTime = (int) gameTime.TotalGameTime.TotalSeconds;
var circlePosition = Vector2.Normalize(vehicle.Velocity)*CircleDistance +vehicle.Position;
var circleOffset = new Vector2((float)(CircleRadius * Math.Cos(_currentWanderAngle)),
(float)(CircleRadius * Math.Sin(_currentWanderAngle)));
var steeringDirection = (circlePosition+ circleOffset) - vehicle.Position;
return steeringDirection;
}
public Vector2 Update(Vehicle vehicle, GameTime gameTime)
{
// Todo:
// Add a value of between -RateOfChangeOfDirection and RateOfChangeOfDirection to the _currentWanderAngle variable.
// Update the variable every half second, so the changes in steering are more obvious
// Hint:
// You can use the _random variable that was passed in to the constructor to get a random value between -1 and 1.
// Todo:
// Figure out the circle position by taking the vehicles velocity (vehicle is a parameter passed into this method),
// normalising it, multiplying by the circle distance, and finally adding the vehicles position.
// Todo:
// Calculate an offset on the steering circle based on the value in the _currentWanderAngle variable and the radius
// of the circle, whose value is stored in CircleRadius.
// Todo:
// Return a steering direction that represents a vector from the vehicles position to the point on the steering cirle
// you just calculated.
return Vector2.Zero;
}
public Entity(Game game, SpriteBatch spriteBatch, Vehicle vehicle)
: base(game)
{
_spriteBatch = spriteBatch;
_vehicle = vehicle;
}