private Vector2D Wander()
{
//this behavior is dependent on the update rate, so this line must
//be included when using time independent framerate.
var jitterThisTimeSlice = m_dWanderJitter * _entity.TimeEllapsed;
if (jitterThisTimeSlice <= 0)
jitterThisTimeSlice = 1;
//first, add a small random vector to the target's position
m_vWanderTarget += new Vector2D((float)(VectorHelper.RandomClamped() * jitterThisTimeSlice),
(float)(VectorHelper.RandomClamped() * jitterThisTimeSlice));
//reproject this new vector back on to a unit circle
m_vWanderTarget.Normalize();
//increase the length of the vector to the same as the radius
//of the wander circle
m_vWanderTarget *= (float)_mDWanderRadius;
//move the target into a position WanderDist in front of the agent
Vector2D target = m_vWanderTarget + new Vector2D(m_dWanderDistance, 0);
//project the target into world space
_entity.Target = PointToWorldSpace(target,
_entity.Heading,
_entity.Side,
_entity.Pos);
//and steer towards it
return _entity.Target - _entity.Pos;
}
