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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 IStoneTray<E> {
protected HashMap<E, Pair<E, Position>> objects = new HashMap<E, Pair<E, Position>>();
/** Possible move directions in case of overlapping Stones/Sets */
protected static enum Direction {
LEFT, RIGHT, TOP, BOTTOM;
}
@Override
public void drop(E object, Position position) {
if (object != null) {
drop(object, position, null);
}
}
private void drop(E object, Position position, Direction direction) {
Pair<Position, Direction> update = fixInvalidDrop(object, position,
direction);
if (update != null) {
position = update.getFirst();
direction = update.getSecond();
}
dropUnchecked(object, position, direction);
}
@SuppressWarnings("unchecked")
private void dropUnchecked(E object, Position position, Direction direction) {
objects.put(object, new Pair<E, Position>(object, position));
for (Pair<E, Position> i : ((Map<E, Pair<E, Position>>) objects.clone())
.values()) {
Direction newDirection = direction;
E currentObject = i.getFirst();
if (currentObject == object)
continue;
Position currentPosition = getPosition(currentObject);
if (!objectsOverlap(object, position, currentObject, currentPosition)) {
continue;
}
// Object would be placed inside the current object
if (newDirection == null) {
newDirection = getMoveDirection(object, position, i);
}
Position newPosition = null;
// Move object to avoid overlap
switch (newDirection) {
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(currentObject);
drop(currentObject, newPosition, newDirection);
}
}
/**
* Checks whether the object may be placed on the given position, computes new
* position if not
*
* @param object
* to be dropped
* @param dir
* @param pos
* the object is dropped at
* @return null if the drop is valid, new position otherwise
*/
protected Pair<Position, Direction> fixInvalidDrop(E object, Position pos,
Direction dir) {
return null;
}
private boolean lessOrEqual(float x, float y) {
if (-0.000001f < y && y < 0.000001f) {
return (x < y + 0.000001f);
}
float q = x / y;
if (0.999999f < q && q < 1.000001f) {
return true;
}
return x < y;
}
/** 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 (lessOrEqual(position1.getX() + object1.getWidth(), position2.getX())) {
return false;
}
if (lessOrEqual(position1.getY() + object1.getHeight(), position2.getY())) {
return false;
}
if (lessOrEqual(position2.getX() + object2.getWidth(), position1.getX())) {
return false;
}
if (lessOrEqual(position2.getY() + object2.getHeight(), position1.getY())) {
return false;
}
return true;
}
private Direction getMoveDirection(E object, Position position,
Pair<E, Position> blocking) {
boolean isVertical = getMoveOrientation(object, position, blocking);
float objectMidpointX = position.getX() + object.getWidth() / 2;
float objectMidpointY = position.getY() + object.getHeight() / 2;
float blockingMidpointX = blocking.getSecond().getX()
+ blocking.getFirst().getWidth() / 2;
float blockingMidpointY = blocking.getSecond().getY()
+ blocking.getFirst().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 getMoveOrientation(E object, Position position,
Pair<E, Position> blocking) {
float objectRight = position.getX() + object.getWidth();
float blockingRight = blocking.getSecond().getX()
+ blocking.getFirst().getWidth();
float overlapRight = Math.min(objectRight, blockingRight);
float overlapLeft = Math.max(position.getX(), blocking.getSecond().getX());
float overlapX = overlapRight - overlapLeft;
float objectBottom = position.getY() + object.getHeight();
float blockingBottom = blocking.getSecond().getY()
+ blocking.getFirst().getHeight();
float overlapBottom = Math.min(objectBottom, blockingBottom);
float overlapTop = Math.max(position.getY(), blocking.getSecond().getY());
float overlapY = overlapBottom - overlapTop;
// vertical or horizontal Shift
// TODO magic factor
return overlapX > overlapY;
}
/*
* (non-Javadoc)
*
* @see jrummikub.model.IStoneTray#getPosition(E)
*/
@Override
public Position getPosition(E object) {
return objects.get(object).getSecond();
}
@Override
public Iterator<Pair<E, Position>> iterator() {
return objects.values().iterator();
}
/*
* (non-Javadoc)
*
* @see jrummikub.model.IStoneTray#pickUp(E)
*/
@Override
public boolean pickUp(E object) {
return null != objects.remove(object);
}
/*
* (non-Javadoc)
*
* @see jrummikub.model.IStoneTray#clone()
*/
@SuppressWarnings("unchecked")
@Override
public IStoneTray<E> clone() {
try {
StoneTray<E> copy = (StoneTray<E>) super.clone();
copy.objects = (HashMap<E, Pair<E, Position>>) objects.clone();
return copy;
} catch (CloneNotSupportedException e) {
e.printStackTrace();
return null;
}
}
@Override
public int getSize() {
return objects.size();
}
}
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