public void FindRotationAdjustmentTest()
{
Assert.AreEqual(3 * MathHelper.PiOver4, VectorHelpers.FindRotationAdjustment(new Vector2(1, 0), new Vector2(0, 1), MathHelper.ToRadians(0)), 0.01);
Assert.AreEqual(1 * MathHelper.PiOver4, VectorHelpers.FindRotationAdjustment(new Vector2(1, 0), new Vector2(0, 1), MathHelper.ToRadians(90)), 0.01);
Assert.AreEqual(-1 * MathHelper.PiOver4, VectorHelpers.FindRotationAdjustment(new Vector2(1, 0), new Vector2(0, 1), MathHelper.ToRadians(180)), 0.01);
Assert.AreEqual(-3 * MathHelper.PiOver4, VectorHelpers.FindRotationAdjustment(new Vector2(1, 0), new Vector2(0, 1), MathHelper.ToRadians(270)), 0.01);
Assert.AreEqual(-1 * MathHelper.PiOver4, VectorHelpers.FindRotationAdjustment(new Vector2(0, 1), new Vector2(1, 0), MathHelper.ToRadians(0)), 0.01);
}
public override void Update()
{
Point target = TargetEntity != null ? TargetEntity.Position : Target;
Vector2 targetPositionVector = new Vector2(target.X, target.Y);
float rotationDiff = VectorHelpers.FindRotationAdjustment(PositionVector, targetPositionVector, Rotation);
float turnFactor = Math.Min(TurnRate / Math.Abs(rotationDiff), 1);
float amountToTurn = rotationDiff * turnFactor;
Rotation += amountToTurn;
float distanceToTarget = Vector2.Distance(targetPositionVector, PositionVector);
float distanceToFly = Math.Min(distanceToTarget, MovementSpeed);
PositionVector = VectorHelpers.MoveInDirection(PositionVector, Rotation, distanceToFly);
if (Vector2.Distance(targetPositionVector, PositionVector) < ExplosionRadius)
{
Explode();
}
}
