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Classes in own files
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andrew
@@ -144,199 +144,4 @@ public class Battle {
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catch (IOException e) {
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}
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}
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private static class Ship {
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public static final int ORIENT_E=0;
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public static final int ORIENT_SE=1;
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public static final int ORIENT_S=2;
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public static final int ORIENT_SW=3;
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private int id;
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private int size;
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private String type;
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private boolean placed;
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private boolean sunk;
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private ArrayList<Boolean> hits;
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private int startX;
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private int startY;
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private int orientX;
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private int orientY;
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public Ship(int i, String name, int sz) {
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id = i; type = name; size = sz;
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sunk = false; placed = false;
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hits = new ArrayList<>(Collections.nCopies(size, false));
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}
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public int id() { return id; }
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public int size() { return size; }
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public void hit(int x, int y) {
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int offset;
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if (orientX != 0) {
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offset = (x - startX) / orientX;
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} else {
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offset = (y - startY) / orientY;
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}
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hits.set(offset, true);
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sunk = hits.stream().allMatch(Predicate.isEqual(true));
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}
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public boolean isSunk() { return sunk; }
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public boolean wasHit(int x, int y) {
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int offset;
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if (orientX != 0) {
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offset = (x - startX) / orientX;
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} else {
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offset = (y - startY) / orientY;
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}
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return hits.get(offset);
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};
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public void placeRandom(Sea s) {
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Random random = new Random();
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for (int tries = 0 ; tries < 1000 ; ++tries) {
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int x = random.nextInt(s.size());
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int y = random.nextInt(s.size());
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int orient = random.nextInt(4);
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if (place(s, x, y, orient)) return;
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}
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throw new RuntimeException("Could not place any more ships");
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}
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private boolean extendShip(Sea s, int fromX, int fromY, int toX, int toY) {
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if (!s.isEmpty(toX, toY)) return false; // no space
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if ((fromX == toX)||(fromY == toY)) return true; // horizontal or vertical
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// we can extend the ship without colliding, but we are going diagonally
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// and it should not be possible for two ships to cross each other on
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// opposite diagonals.
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// check the two tiles that would cross us here - if either is empty, we are OK
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// if they both contain different ships, we are OK
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// but if they both contain the same ship, we are crossing!
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int corner1 = s.get(fromX, toY);
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int corner2 = s.get(toX, fromY);
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if ((corner1 == 0) || (corner1 != corner2)) return true;
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return false;
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}
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public boolean place(Sea s, int x, int y, int orient) {
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if (placed) {
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throw new RuntimeException("Program error - placed ship " + id + " twice");
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}
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switch(orient) {
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case ORIENT_E:
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orientX = 1; orientY = 0;
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break;
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case ORIENT_SE:
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orientX = 1; orientY = 1;
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break;
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case ORIENT_S:
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orientX = 0; orientY = 1;
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break;
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case ORIENT_SW:
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orientX = -1; orientY = 1;
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break;
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default:
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throw new RuntimeException("Invalid orientation " + orient);
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}
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if (!s.isEmpty(x, y)) return false;
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startX = x; startY = y;
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int tilesPlaced = 1;
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int nextX = startX;
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int nextY = startY;
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while (tilesPlaced < size) {
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if (extendShip(s, nextX, nextY, nextX + orientX, nextY + orientY)) {
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tilesPlaced += 1;
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nextX = nextX + orientX;
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nextY = nextY + orientY;
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} else {
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int backX = startX - orientX;
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int backY = startY - orientY;
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if (extendShip(s, startX, startY, backX, backY)) {
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tilesPlaced +=1;
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startX = backX;
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startY = backY;
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} else {
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return false;
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}
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}
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}
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for (int i = 0; i < size; ++i) {
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int sx = startX + i * orientX;
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int sy = startY + i * orientY;
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s.set(sx, sy, id);
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}
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placed = true;
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return true;
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}
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}
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private static class Sea {
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private int tiles[];
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private boolean hits[];
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private int size;
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public Sea(int make_size) {
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size = make_size;
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tiles = new int[size*size];
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}
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public int size() { return size; }
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public String encodedDump() {
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StringBuilder out = new StringBuilder();
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for (int x = 0; x < size; ++x) {
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for (int y = 0; y < size; ++y)
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out.append(Integer.toString(get(x, y)));
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out.append('\n');
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}
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return out.toString();
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}
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/* return true if x,y is in the sea and empty
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* return false if x,y is occupied or is out of range
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*/
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public boolean isEmpty(int x, int y) {
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if ((x<0)||(x>=size)||(y<0)||(y>=size)) return false;
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return (get(x,y) == 0);
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}
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/* return the ship number, or zero if no ship */
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public int get(int x, int y) {
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return tiles[index(x,y)];
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}
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public void set(int x, int y, int value) {
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tiles[index(x, y)] = value;
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}
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public int shipHit(int x, int y) {
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if (hits[index(x,y)]) return get(x, y);
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else return 0;
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}
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public void recordHit(int x, int y) {
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hits[index(x, y)] = true;
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}
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private int index(int x, int y) {
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if ((x < 0) || (x >= size))
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throw new ArrayIndexOutOfBoundsException("Program error: x cannot be " + x);
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if ((y < 0) || (y >= size))
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throw new ArrayIndexOutOfBoundsException("Program error: y cannot be " + y);
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return y*size + x;
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}
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}
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}
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