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package ch.epfl.xblast;
/**
* A SubCell.
*
* @author Pacien TRAN-GIRARD (261948)
* @author Timothée FLOURE (257420)
*/
public final class SubCell implements Comparable<SubCell> {
/**
* The number of x-subdivisions of each Cell.
*/
private static final int SUB_COL_DIVISIONS = 16;
/**
* The number of y-subdivisions of each Cell.
*/
private static final int SUB_ROW_DIVISIONS = 16;
/**
* The width of the board (total of sub-columns).
*/
private static final int SUB_COLUMNS = SUB_COL_DIVISIONS * Cell.COLUMNS;
/**
* The height of the board (total of sub-rows).
*/
private static final int SUB_ROWS = SUB_ROW_DIVISIONS * Cell.ROWS;
/**
* The coordinates of the SubCell.
*/
private final int x, y;
/**
* Instantiates a new SubCell with the given coordinates.
*
* @param x the x-coordinate
* @param y the y-coordinate
*/
public SubCell(int x, int y) {
this.x = Cell.normalize(SUB_COLUMNS, x);
this.y = Cell.normalize(SUB_ROWS, y);
}
/**
* Returns the normalized x-coordinate of the SubCell.
*
* @return the x-coordinate
*/
public int x() {
return this.x;
}
/**
* Returns the normalized y-coordinate of the SubCell.
*
* @return the y-coordinate
*/
public int y() {
return this.y;
}
/**
* Returns T(this SubCell is central).
*
* @return T(this SubCell is central)
*/
public boolean isCentral() {
return this.distanceToCentral() == 0;
}
/**
* Returns the Manhattan distance to the closest central SubCell.
*
* @return the distance
*/
public int distanceToCentral() {
return this.distanceTo(centralSubCellOf(this.containingCell()));
}
/**
* Computes the Manhattan distance to the given SubCell.
*
* @param subCell the other SubCell
* @return the distance
*/
public int distanceTo(SubCell subCell) {
return Math.abs(this.x - subCell.x) + Math.abs(this.y - subCell.y);
}
/**
* Returns the central SubCell of the given Cell.
*
* @param cell the reference Cell
* @return the central SubCell
*/
public static SubCell centralSubCellOf(Cell cell) {
return new SubCell(
cell.x() * SUB_COL_DIVISIONS + (SUB_COL_DIVISIONS / 2),
cell.y() * SUB_ROW_DIVISIONS + (SUB_ROW_DIVISIONS / 2)
);
}
/**
* Returns the Cell containing this SubCell.
*
* @return the containing Cell
*/
public Cell containingCell() {
return new Cell(this.x / SUB_COL_DIVISIONS, this.y / SUB_ROW_DIVISIONS);
}
/**
* Returns the neighboring SubCell at the given Direction.
*
* @param dir the Direction
* @return the neighboring SubCell
*/
public SubCell neighbor(Direction dir) {
return new SubCell(this.x + dir.xVector(), this.y + dir.yVector());
}
/**
* Returns the hash code of this SubCell, given by its row-major index.
*
* @return the hash code
*/
@Override
public int hashCode() {
return this.rowMajorIndex();
}
/**
* Returns T(the given Object is equal to this SubCell (have the same coordinates)).
*
* @param that the Object to compare against
* @return T(the given Object is equal to this SubCell)
*/
@Override
public boolean equals(Object that) {
if (that == null) return false;
if (that == this) return true;
if (!(that instanceof SubCell)) return false;
return (((SubCell) that).rowMajorIndex() == this.rowMajorIndex());
}
/**
* Returns a String representation of the coordinates of the SubCell.
*
* @return a String representation of the coordinates of the SubCell
*/
@Override
public String toString() {
return String.format("(%d,%d)", this.x, this.y);
}
/**
* Returns the index of the SubCell (major ordered).
*
* @return the index of the SubCell
*/
private int rowMajorIndex() {
return this.y * SUB_COLUMNS + this.x;
}
/**
* Compares two SubCells relatively to their row major indexes.
*
* @param subCell the other SubCell to compare
* @return the comparison result
*/
@Override
public int compareTo(SubCell subCell) {
return Integer.compare(this.rowMajorIndex(), subCell.rowMajorIndex());
}
}
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