robocode.util
Class Utils

java.lang.Object
  extended by robocode.util.Utils

public class Utils
extends Object

Utility class that provide methods for normalizing angles.

Author:
Mathew A. Nelson (original), Flemming N. Larsen (contributor)

Field Summary
static double NEAR_DELTA
           
 
Method Summary
static Random getRandom()
          Returns random number generator.
static boolean isNear(double value1, double value2)
          Tests if the two double values are near to each other.
static double normalAbsoluteAngle(double angle)
          Normalizes an angle to an absolute angle.
static double normalNearAbsoluteAngle(double angle)
          Normalizes an angle to be near an absolute angle.
static double normalRelativeAngle(double angle)
          Normalizes an angle to a relative angle.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

NEAR_DELTA

public static final double NEAR_DELTA
See Also:
Constant Field Values
Method Detail

normalAbsoluteAngle

public static double normalAbsoluteAngle(double angle)
Normalizes an angle to an absolute angle. The normalized angle will be in the range from 0 to 2*PI, where 2*PI itself is not included.

Parameters:
angle - the angle to normalize
Returns:
the normalized angle that will be in the range of [0,2*PI[

normalRelativeAngle

public static double normalRelativeAngle(double angle)
Normalizes an angle to a relative angle. The normalized angle will be in the range from -PI to PI, where PI itself is not included.

Parameters:
angle - the angle to normalize
Returns:
the normalized angle that will be in the range of [-PI,PI[

normalNearAbsoluteAngle

public static double normalNearAbsoluteAngle(double angle)
Normalizes an angle to be near an absolute angle. The normalized angle will be in the range from 0 to 2*PI, where 2*PI itself is not included. If the normalized angle is near to 0, PI/2, PI, 3*PI/2 or 2*PI, that angle will be returned. The isNear method is used for defining when the angle is near one of angles listed above.

Parameters:
angle - the angle to normalize
Returns:
the normalized angle that will be in the range of [0,2*PI[
See Also:
normalAbsoluteAngle(double), isNear(double, double)

isNear

public static boolean isNear(double value1,
                             double value2)
Tests if the two double values are near to each other. It is recommended to use this method instead of testing if the two doubles are equal using an this expression: value1 == value2. The reason being, that this expression might never become true due to the precision of double values. Whether or not the specified doubles are near to each other is defined by the following expression: (Math.abs(value1 - value2) < .00001)

Parameters:
value1 - the first double value
value2 - the second double value
Returns:
true if the two doubles are near to each other; false otherwise.

getRandom

public static Random getRandom()
Returns random number generator. It might be configured for repeatable behavior by setting -DRANDOMSEED option.

Returns:
random number generator