public void ManhattanDistanceTest( )
{
ManhattanDistance dist = new ManhattanDistance( );
Assert.Throws <ArgumentException>(() => dist.GetDistance(p0, q4));
double result = dist.GetDistance(p0, q0);
Assert.AreEqual(result, 1);
result = dist.GetDistance(p1, q1);
Assert.AreEqual(result, 1.5);
result = dist.GetDistance(p2, q2);
Assert.AreEqual(result, 0);
result = dist.GetDistance(p3, q3);
Assert.AreEqual(result, 0);
result = dist.GetDistance(p4, q4);
Assert.AreEqual(result, 4.5);
result = dist.GetDistance(p5, q5);
Assert.AreEqual(result, 12);
}
protected void ChooseTarget(Unit[] potentialTargets)
{
if (potentialTargets.Length > 0)
{
//order units by their manhattan distance from the units coord.
IEnumerable <Unit> iter = potentialTargets.OrderBy(unit => ManhattanDistance.GetDistance(cubeCoordinate, unit.CubeCoordinate));
//choose the lowest distance (first item)
Unit closestTarget = iter.First();
//choose the closest unit as the target if
// 1. unit currently has no target
// OR 2. target has died
// OR 3. current target is further away than the closest potential target
if (target == null ||
!target.IsAlive() ||
ManhattanDistance.GetDistance(cubeCoordinate, closestTarget.CubeCoordinate)
< ManhattanDistance.GetDistance(cubeCoordinate, target.CubeCoordinate))
{
target = iter.First();
}
}
}