/// <summary>
/// Causes this Animal to try to move one step in the direction of the specified targetCell.
/// </summary>
/// <param name="targetCell"> the cell to move towards. </param>
/// <returns> true if the Animal successfully moved, or false otherwise. </returns>
public bool Move(Cell targetCell)
{
return(Move(PigWorld.GetDirection(this.Cell, targetCell)));
}
/// <summary>
/// The radar commences or continues its clockwise sweep until either:
/// (a) a target object is found of the right type; or
/// (b) the sweep returns to North and null is returned.
/// </summary>
/// <returns> Either null or the Echo of a new object that belongs to the targetType. </returns>
public Echo Ping()
{
Thing bestSoFarThing = null;
Direction bestSoFarDirection = null;
double bestSoFarAngle = 0.0;
double bestSoFarDistance = 0.0;
foreach (Thing thing in pigWorld.Things)
{
// the radar should not detect its owner
if (thing == owner)
{
continue;
}
// the radar only detects instances of the right class, and its subclasses (if any).
if (!Util.IsSameTypeOrSubtype(thing.GetType(), targetType))
{
continue;
}
Direction tempDirection = pigWorld.GetDirection(owner, thing);
double tempAngle = tempDirection.Degrees;
if (tempAngle <= sweepAngle)
{
continue;
}
if (bestSoFarThing == null)
{
bestSoFarThing = thing;
bestSoFarDirection = tempDirection;
bestSoFarAngle = tempAngle;
bestSoFarDistance = pigWorld.GetDistance(owner, bestSoFarThing);
}
else
{
if (tempAngle < bestSoFarAngle)
{
bestSoFarThing = thing;
bestSoFarDirection = tempDirection;
bestSoFarAngle = tempAngle;
bestSoFarDistance = pigWorld.GetDistance(owner, bestSoFarThing);
}
else
if (tempAngle == bestSoFarAngle)
{
double tempDistance = pigWorld.GetDistance(owner, thing);
if (tempDistance < bestSoFarDistance)
{
bestSoFarThing = thing;
// Don't have to change bestSoFarDirection or bestSoFarAngle.
bestSoFarDistance = tempDistance;
}
} // if (tempAngle == bestSoFarAngle)
} // if else (bestSoFarThing == null)
} // end foreach
if (bestSoFarThing == null)
{
sweepAngle = -1.0; // ready for a new sweep
return(null);
}
else
{
sweepAngle = bestSoFarAngle;
Type typeOfFirstThing = bestSoFarThing.GetType();
Echo echo = new Echo(typeOfFirstThing, bestSoFarDirection, bestSoFarDistance);
return(echo);
}
} // method Ping