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package jrummikub.model;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import jrummikub.util.Pair;
/**
* A StoneTray is a collection of positioned objects (for example {@link Stone}s
* or {@link StoneSet}s.
*
* @param <E>
* Type of positioned objects (must implement Sizeable)
*/
public class StoneTray<E extends Sizeable> implements
Iterable<Pair<E, Position>> {
protected HashMap<E, Position> objects = new HashMap<E, Position>();
/** Possible move directions in case of overlapping Stones/Sets */
private static enum Direction {
LEFT, RIGHT, TOP, BOTTOM;
}
/**
* Removes object from tray and returns it
*
* @param position
* position of the object that will be removed
* @return the picked up stone
*/
public E pickUp(Position position) {
for (Map.Entry<E, Position> i : objects.entrySet()) {
Position currentPosition = i.getValue();
E currentObject = i.getKey();
// Tests if position is left of, above ... the current object
if (position.getX() < currentPosition.getX()) {
continue;
}
if (position.getY() < currentPosition.getY()) {
continue;
}
if (position.getX() > currentPosition.getX()
+ currentObject.getWidth()) {
continue;
}
if (position.getY() > currentPosition.getY()
+ currentObject.getHeight()) {
continue;
}
// Position is inside the current object
objects.remove(i.getKey());
return currentObject;
}
return null;
}
/**
* Adds object to the tray
*
* @param object
* object to add to Hand
* @param position
* {@link Position} to put the object
*/
public void drop(E object, Position position) {
if (object != null) {
drop(object, position, null);
}
}
@SuppressWarnings("unchecked")
private void drop(E object, Position position, Direction direction) {
for (Map.Entry<E, Position> i : ((Map<E,Position>)objects.clone()).entrySet()) {
Position currentPosition = i.getValue();
E currentObject = i.getKey();
if (!objectsOverlap(object, position, currentObject,
currentPosition)) {
continue;
}
// Object would be placed inside the current object
if (direction == null) {
direction = getMoveDirection(object, position, i);
}
Position newPosition = null;
// Move object to avoid overlap
switch (direction) {
case TOP:
newPosition = new Position(currentPosition.getX(),
position.getY() - currentObject.getHeight());
break;
case BOTTOM:
newPosition = new Position(currentPosition.getX(),
position.getY() + object.getHeight());
break;
case LEFT:
newPosition = new Position(position.getX()
- currentObject.getWidth(), currentPosition.getY());
break;
case RIGHT:
newPosition = new Position(position.getX() + object.getWidth(),
currentPosition.getY());
break;
}
objects.remove(i.getKey());
drop(currentObject, newPosition, direction);
}
objects.put(object, position);
}
/** Tests whether two objects overlap **/
private boolean objectsOverlap(E object1, Position position1, E object2,
Position position2) {
// Tests if position is left of, above ... the current object
if (position1.getX() + object1.getWidth() <= position2.getX()) {
return false;
}
if (position1.getY() + object1.getHeight() <= position2.getY()) {
return false;
}
if (position1.getX() >= position2.getX() + object2.getWidth()) {
return false;
}
if (position1.getY() >= position2.getY() + object2.getHeight()) {
return false;
}
return true;
}
private Direction getMoveDirection(E object, Position position,
Map.Entry<E, Position> blocking) {
boolean isVertical = getMoveOrientationn(object, position, blocking);
float objectMidpointX = position.getX() + object.getWidth() / 2;
float objectMidpointY = position.getY() + object.getHeight() / 2;
float blockingMidpointX = blocking.getValue().getX()
+ blocking.getKey().getWidth() / 2;
float blockingMidpointY = blocking.getValue().getY()
+ blocking.getKey().getHeight() / 2;
if (isVertical) {
if (objectMidpointY < blockingMidpointY) {
return Direction.BOTTOM;
} else {
return Direction.TOP;
}
} else {
if (objectMidpointX < blockingMidpointX) {
return Direction.RIGHT;
} else {
return Direction.LEFT;
}
}
}
private boolean getMoveOrientationn(E object, Position position,
Map.Entry<E, Position> blocking) {
float objectRight = position.getX() + object.getWidth();
float blockingRight = blocking.getValue().getX()
+ blocking.getKey().getWidth();
float overlapRight = Math.min(objectRight, blockingRight);
float overlapLeft = Math.max(position.getX(), blocking.getValue()
.getX());
float overlapX = overlapRight - overlapLeft;
float objectBottom = position.getY() + object.getHeight();
float blockingBottom = blocking.getValue().getY()
+ blocking.getKey().getHeight();
float overlapBottom = Math.min(objectBottom, blockingBottom);
float overlapTop = Math.max(position.getY(), blocking.getValue()
.getY());
float overlapY = overlapBottom - overlapTop;
// vertical or horizontal Shift
// TODO magic factor
return overlapX > overlapY;
}
/**
* Returns the position of an object that is already on the tray
*
* @param object
* object whose position is requested
* @return position of the object or null when the object is not on the tray
*/
public Position getPosition(E object) {
return objects.get(object);
}
@Override
public Iterator<Pair<E, Position>> iterator() {
final Iterator<Map.Entry<E, Position>> entryIterator = objects.entrySet().iterator();
return new Iterator<Pair<E, Position>>() {
Iterator<Map.Entry<E, Position>> iterator = entryIterator;
@Override
public boolean hasNext() {
return iterator.hasNext();
}
@Override
public Pair<E, Position> next() {
Map.Entry<E, Position> entry = iterator.next();
return new Pair<E, Position>(entry.getKey(), entry.getValue());
}
@Override
public void remove() {
iterator.remove();
}
};
}
public void pickUp(E object) {
objects.remove(object);
}
@Override
public StoneTray<E> clone() {
StoneTray<E> copy = new StoneTray();
copy.objects = (HashMap<E, Position>) objects.clone();
return copy;
}
}
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