public static Vector3 AIGetNewPosition(Butterfly b, int tier, Vector3 tetherPoint)
{
switch (tier)
{
case 0:
goto default;
case 1:
return Wander(b, new Vector2(tetherPoint.X, tetherPoint.Y), 0.025f);
case 2:
return Wander(b, new Vector2(tetherPoint.X, tetherPoint.Y), 0.03f);
case 3:
return Wander(b, new Vector2(tetherPoint.X, tetherPoint.Y), 0.035f);
case 4:
return Wander(b, new Vector2(tetherPoint.X, tetherPoint.Y), .040f);
case 5:
return Wander(b, new Vector2(tetherPoint.X, tetherPoint.Y), .045f);
case 6:
return Wander(b, new Vector2(tetherPoint.X, tetherPoint.Y), .050f);
case 7:
return Wander(b, new Vector2(tetherPoint.X, tetherPoint.Y), .55f);
case 8:
return Wander(b, new Vector2(tetherPoint.X, tetherPoint.Y), .60f);
case 9:
return Wander(b, new Vector2(tetherPoint.X, tetherPoint.Y), .225f);
default:
return Wander(b, new Vector2(b.getPosition().X, b.getPosition().Y), 0f);
}
}
/// <summary>
/// This code heavily influenced by http://xbox.create.msdn.com/en-US/education/catalog/sample/chase_evade
/// </summary>
/// <param name="b"> the butterfly I wish to operate on</param>
/// <param name="tether">that butterfly's tether point</param>
/// <param name="speed">the speed at which we can move the butterfly</param>
/// <returns></returns>
private static Vector3 Wander(Butterfly b, Vector2 tether, float speed)
{
float wanderX = b.WanderDirection.X;
float wanderY = b.WanderDirection.Y;
Vector3 ButterflyPosition = b.getPosition();
wanderX += MathHelper.Lerp(-.25f, .25f, (float)rand.NextDouble());
wanderY += MathHelper.Lerp(-.25f, .25f, (float)rand.NextDouble());
Vector2 wanderDirection = new Vector2(wanderX, wanderY);
if (wanderDirection != Vector2.Zero)
{
wanderDirection.Normalize();
}
b.WanderDirection = wanderDirection;
float distanceFromTether = Vector2.Distance(new Vector2(b.getPosition().X, b.getPosition().Y), tether);
float maxDistanceFromTether = 1f;
float normalizedDistance = distanceFromTether / maxDistanceFromTether;
float turnBackToTetherSpeed = normalizedDistance;
float angle = getRotationAngle(new Vector2(ButterflyPosition.X, ButterflyPosition.Y), tether, wanderDirection, turnBackToTetherSpeed * .15f);
wanderDirection = Vector2.Transform(wanderDirection, Matrix.CreateRotationZ(angle));
Vector3 displacement = new Vector3(wanderDirection, 0);
Vector3 updateVect = ButterflyPosition + (displacement * speed);
Vector3 clampedVect = Vector3.Clamp(updateVect, new Vector3(-6, -6, 0), new Vector3(6,5,0));
if(updateVect.Length() != clampedVect.Length()) // we may be at an edge, lets flip ourselves 90 degrees
{
b.WanderDirection = b.WanderDirection * -1;
}
return clampedVect;
}
void WrongChoice(Butterfly b)
{
soundBank.PlayCue("73581__benboncan__sad-trombone");
spriteQueue.Add(new Tuple<Vector3,int>(b.getPosition(), 1));
queueTimers.Add(30);
scoreStrings.Add("x 0");
b.Hide();
mistakeCount++;
}
void RightChoice(Butterfly b)
{
spriteQueue.Add(new Tuple<Vector3, int>(b.getPosition(), 0));
queueTimers.Add(30);
soundBank.PlayCue("145459__soughtaftersounds__menu-click-sparkle");
int score = playerProfile.Score;
score += Math.Max(1, tier);
playerProfile.Score = score;
scoreStrings.Add(String.Format("x {0}", Math.Max(1, tier)));
b.Hide();
}