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package ch.epfl.xblast;
/**
* Directions.
*
* @author Pacien TRAN-GIRARD (261948)
* @author Timothée FLOURE (257420)
*/
public enum Direction {
/**
* North
*/
N,
/**
* East
*/
E,
/**
* South
*/
S,
/**
* West
*/
W;
/**
* T(the Direction is horizontal to the screen (East or West)).
*
* @return T(the Direction is horizontal to the screen)
*/
public boolean isHorizontal() {
return this == E || this == W;
}
/**
* T(the current and given Directions are parallel (identical or opposite)).
*
* @param that a Direction to compare
* @return T(the current and given Directions are parallel)
*/
public boolean isParallelTo(Direction that) {
return that == this || that == this.opposite();
}
/**
* Returns the opposite Direction.
*
* @return the opposite Direction
*/
public Direction opposite() {
switch (this) {
case N:
return S;
case S:
return N;
case E:
return W;
case W:
return E;
default:
return null;
}
}
/**
* T(the current and given Directions are perpendicular).
*
* @param that a Direction to compare
* @return T(the current and given Directions are perpendicular)
*/
public boolean isPerpendicularTo(Direction that) {
switch (this) {
case N:
case S:
return that == E || that == W;
case E:
case W:
return that == N || that == S;
default:
return false;
}
}
/**
* Returns the x-coordinate of the normed vector representation of the Direction.
*
* @return the x-coordinate
*/
public int xVector() {
switch (this) {
case W:
return -1;
case E:
return +1;
default:
return 0;
}
}
/**
* Returns the x-coordinate of the normed vector representation of the Direction.
*
* @return the y-coordinate
*/
public int yVector() {
switch (this) {
case N:
return -1;
case S:
return +1;
default:
return 0;
}
}
}
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