1 files changed, 196 insertions, 0 deletions

diff --git a/src/ch/epfl/xblast/Cell.java b/src/ch/epfl/xblast/Cell.java
new file mode 100644
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--- /dev/null
+++ b/src/ch/epfl/xblast/Cell.java
@@ -0,0 +1,196 @@
+package ch.epfl.xblast;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * A Cell.
+ *
+ * @author Pacien TRAN-GIRARD (261948)
+ */
+public final class Cell {
+
+    /**
+     * The width of the board (number of columns).
+     */
+    public static final int COLUMNS = 15;
+
+    /**
+     * The height of the board (number of rows).
+     */
+    public static final int ROWS = 13;
+
+    /**
+     * The total number of Cell-s of the board.
+     */
+    public static final int COUNT = COLUMNS * ROWS;
+
+    /**
+     * The list of the board's Cell's, major-ordered.
+     */
+    public static final List<Cell> ROW_MAJOR_ORDER = Collections.unmodifiableList(rowMajorOrder());
+
+    /**
+     * The list of the board's Cell-s, spiral-ordered.
+     */
+    public static final List<Cell> SPIRAL_ORDER = Collections.unmodifiableList(spiralOrder());
+
+    /**
+     * Builds a major-ordered list of Cell-s.
+     *
+     * @return the list of Cell-s
+     */
+    private static ArrayList<Cell> rowMajorOrder() {
+        ArrayList<Cell> list = new ArrayList<>(COUNT);
+
+        for (int row = 0; row < ROWS; ++row)
+            for (int col = 0; col < COLUMNS; ++col)
+                list.add(new Cell(col, row));
+
+        return list;
+    }
+
+    /**
+     * Builds a spiral-ordered list of Cell-s.
+     *
+     * @return the list of Cell-s
+     */
+    private static ArrayList<Cell> spiralOrder() {
+        ArrayList<Cell> list = new ArrayList<>(COUNT);
+        ArrayList<Integer> ix = range(0, COLUMNS, 1);
+        ArrayList<Integer> iy = range(0, ROWS, 1);
+        boolean horizontal = true;
+
+        while (!ix.isEmpty() && !iy.isEmpty()) {
+            ArrayList<Integer> i1 = horizontal ? ix : iy;
+            ArrayList<Integer> i2 = horizontal ? iy : ix;
+            int c2 = i2.remove(0);
+            for (int c1 : i1)
+                list.add(horizontal ? new Cell(c1, c2) : new Cell(c2, c1));
+
+            Collections.reverse(i1);
+            horizontal = !horizontal;
+        }
+
+        return list;
+    }
+
+    /**
+     * Creates a list containing an arithmetic progression.
+     *
+     * @param from the starting value
+     * @param to   the boundary value
+     * @param step the arithmetic step
+     * @return the arithmetic progression
+     */
+    private static ArrayList<Integer> range(int from, int to, int step) {
+        int n = (to - from) / step;
+        ArrayList<Integer> list = new ArrayList<>(n);
+
+        for (int i = 0; i < n; ++i)
+            list.add(from + (i * step));
+
+        return list;
+
+    }
+
+    /**
+     * Normalizes the given number (using the integer floor modulus).
+     *
+     * @param max the maximum (the divisor)
+     * @param n   the number to normalize (the dividend)
+     * @return the normalized value
+     */
+    private static int normalize(int max, int n) {
+        return Math.floorMod(n, max);
+    }
+
+    /**
+     * The coordinates of the Cell.
+     */
+    private final int x, y;
+
+    /**
+     * Instantiates a new Cell with the given coordinates.
+     *
+     * @param x the x-coordinate
+     * @param y the y-coordinate
+     */
+    public Cell(int x, int y) {
+        this.x = normalize(COLUMNS, x);
+        this.y = normalize(ROWS, y);
+    }
+
+    /**
+     * Returns the normalized x-coordinate of the Cell.
+     *
+     * @return the x-coordinate
+     */
+    public int x() {
+        return this.x;
+    }
+
+    /**
+     * Returns the normalized y-coordinate of the Cell.
+     *
+     * @return the y-coordinate
+     */
+    public int y() {
+        return this.y;
+    }
+
+    /**
+     * Returns the index of the Cell (major ordered).
+     *
+     * @return the index of the Cell
+     */
+    public int rowMajorIndex() {
+        return this.x * ROWS + this.y;
+    }
+
+    /**
+     * Returns the neighboring Cell at the given Direction.
+     *
+     * @param dir the Direction
+     * @return the neighboring Cell
+     */
+    public Cell neighbor(Direction dir) {
+        switch (dir) {
+            case N:
+                return new Cell(this.x, this.y - 1);
+            case S:
+                return new Cell(this.x, this.y + 1);
+            case E:
+                return new Cell(this.x - 1, this.y);
+            case W:
+                return new Cell(this.x + 1, this.y);
+            default:
+                return null;
+        }
+    }
+
+    /**
+     * Returns T(the given Object is equal to this Cell (have the same coordinates)).
+     *
+     * @param that the Object to compare against
+     * @return T(the given Object is equal to this Cell)
+     */
+    @Override
+    public boolean equals(Object that) {
+        if (!super.equals(that)) return false;
+        if (!(that instanceof Cell)) return false;
+        return (((Cell) that).x == this.x && ((Cell) that).y == this.y);
+    }
+
+    /**
+     * Returns a String representation of the coordinates of the Cell.
+     *
+     * @return a String representation of the coordinates of the Cell.
+     */
+    @Override
+    public String toString() {
+        return String.format("(%d,%d)", this.x, this.y);
+    }
+
+}