sim.field.grid
Class DenseGrid2D

java.lang.Object
  extended by sim.field.grid.AbstractGrid2D
      extended by sim.field.grid.DenseGrid2D
All Implemented Interfaces:
java.io.Serializable, Grid2D

public class DenseGrid2D
extends AbstractGrid2D

A wrapper for 2D arrays of Objects.

This object expects that the 2D arrays are rectangular. You are encouraged to access the array directly. The object implements all of the Grid2D interface. See Grid2D for rules on how to properly implement toroidal or hexagonal grids.

The width and height of the object are provided to avoid having to say field[x].length, etc.

We very strongly encourage you to examine SparseGrid2D first to see if it's more appropriate to your task. If you need arbitrary numbers of Objects to be able to occupy the same location in the grid, or if you have very few Objects and a very large grid, or if your space is unbounded, you should probably use SparseGrid2D instead.

See Also:
Serialized Form

Field Summary
 Bag[][] field
           
static int INITIAL_BAG_SIZE
          The size of an initial bag
static int LARGE_BAG_RATIO
          A bag must be larger than its contents by this ratio to be replaced replaceLargeBags is true
static int MIN_BAG_SIZE
          No bags smaller than this size will be replaced regardless of the setting of replaceLargeBags
 boolean removeEmptyBags
          Should we remove bags in the field if they have been emptied, and let them GC, or should we keep them around?
 boolean replaceLargeBags
          When a bag drops to one quarter capacity, should we replace it with a new bag?
static int REPLACEMENT_BAG_RATIO
          A bag to be replaced will be shrunk to this ratio if replaceLargeBags is true
 
Fields inherited from class sim.field.grid.AbstractGrid2D
height, width
 
Constructor Summary
DenseGrid2D(int width, int height)
           
 
Method Summary
 void addObjectsToLocation(Bag objs, Int2D location)
           
 void addObjectsToLocation(Bag objs, int x, int y)
          Adds an object to a given location.
 void addObjectsToLocation(java.util.Collection objs, int x, int y)
          Adds an object to a given location.
 void addObjectsToLocation(java.lang.Object[] objs, Int2D location)
           
 void addObjectsToLocation(java.lang.Object[] objs, int x, int y)
          Adds an object to a given location.
 void addObjectToLocation(java.lang.Object obj, Int2D location)
           
 void addObjectToLocation(java.lang.Object obj, int x, int y)
          Adds an object to a given location.
 Bag clear()
          Sets all the locations in the grid to null, and returns in a Bag all stored objects (including duplicates but not null values).
 Bag getNeighborsHamiltonianDistance(int x, int y, int dist, boolean toroidal, Bag result, IntBag xPos, IntBag yPos)
          Gets all neighbors of a location that satisfy abs(x-X) + abs(y-Y) <= dist.
 Bag getNeighborsHexagonalDistance(int x, int y, int dist, boolean toroidal, Bag result, IntBag xPos, IntBag yPos)
          Gets all neighbors located within the hexagon centered at (X,Y) and 2*dist+1 cells from point to opposite point inclusive.
 Bag getNeighborsMaxDistance(int x, int y, int dist, boolean toroidal, Bag result, IntBag xPos, IntBag yPos)
          Gets all neighbors of a location that satisfy max( abs(x-X) , abs(y-Y) ) <= dist.
 Bag getObjectsAtLocation(Int2D location)
          Returns a bag containing all the objects at a given location, or null when there are no objects at the location.
 Bag getObjectsAtLocation(int x, int y)
          Returns a bag containing all the objects at a given location, or null when there are no objects at the location.
 boolean moveObject(java.lang.Object obj, Int2D from, Int2D to)
          If the object is not at FROM, then it's simply inserted into TO, and FALSE is returned.
 boolean moveObject(java.lang.Object obj, int fromX, int fromY, int toX, int toY)
          If the object is not at [fromX, fromY], then it's simply inserted into [toX, toY], and FALSE is returned.
 void moveObjects(Int2D from, Int2D to)
           
 void moveObjects(int fromX, int fromY, int toX, int toY)
           
 int numObjectsAtLocation(Int2D location)
           
 int numObjectsAtLocation(int x, int y)
           
 boolean removeObjectAtLocation(java.lang.Object obj, Int2D location)
           
 boolean removeObjectAtLocation(java.lang.Object obj, int x, int y)
           
 boolean removeObjectMultiplyAtLocation(java.lang.Object obj, Int2D location)
           
 boolean removeObjectMultiplyAtLocation(java.lang.Object obj, int x, int y)
           
 Bag removeObjectsAtLocation(Int2D location)
          Removes all the objects stored at the given location and returns them as a Bag (which you are free to modify).
 Bag removeObjectsAtLocation(int x, int y)
          Removes all the objects stored at the given location and returns them as a Bag (which you are free to modify).
 
Methods inherited from class sim.field.grid.AbstractGrid2D
dlx, dly, downx, downy, drx, dry, getHeight, getNeighborsHamiltonianDistance, getNeighborsHexagonalDistance, getNeighborsMaxDistance, getNeighborsWithinArc, getNeighborsWithinArc, getWidth, stx, sty, trb, trt, tx, ty, ulx, uly, upx, upy, urx, ury
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

removeEmptyBags

public boolean removeEmptyBags
Should we remove bags in the field if they have been emptied, and let them GC, or should we keep them around?


replaceLargeBags

public boolean replaceLargeBags
When a bag drops to one quarter capacity, should we replace it with a new bag?


INITIAL_BAG_SIZE

public static final int INITIAL_BAG_SIZE
The size of an initial bag

See Also:
Constant Field Values

MIN_BAG_SIZE

public static final int MIN_BAG_SIZE
No bags smaller than this size will be replaced regardless of the setting of replaceLargeBags

See Also:
Constant Field Values

LARGE_BAG_RATIO

public static final int LARGE_BAG_RATIO
A bag must be larger than its contents by this ratio to be replaced replaceLargeBags is true

See Also:
Constant Field Values

REPLACEMENT_BAG_RATIO

public static final int REPLACEMENT_BAG_RATIO
A bag to be replaced will be shrunk to this ratio if replaceLargeBags is true

See Also:
Constant Field Values

field

public Bag[][] field
Constructor Detail

DenseGrid2D

public DenseGrid2D(int width,
                   int height)
Method Detail

getObjectsAtLocation

public Bag getObjectsAtLocation(int x,
                                int y)
Returns a bag containing all the objects at a given location, or null when there are no objects at the location. You should NOT MODIFY THIS BAG. This is the actual container bag, and modifying it will almost certainly break the Dense Field object. If you want to modify the bag, make a copy and modify the copy instead, using something along the lines of new Bag(foo.getObjectsAtLocation(location)) . Furthermore, changing values in the Dense Field may result in a different bag being used -- so you should not rely on this bag staying valid.


getObjectsAtLocation

public Bag getObjectsAtLocation(Int2D location)
Returns a bag containing all the objects at a given location, or null when there are no objects at the location. You should NOT MODIFY THIS BAG. This is the actual container bag, and modifying it will almost certainly break the Dense Field object. If you want to modify the bag, make a copy and modify the copy instead, using something along the lines of new Bag(foo.getObjectsAtLocation(location)) . Furthermore, changing values in the Dense Field may result in a different bag being used -- so you should not rely on this bag staying valid.


removeObjectsAtLocation

public Bag removeObjectsAtLocation(int x,
                                   int y)
Removes all the objects stored at the given location and returns them as a Bag (which you are free to modify). The location is set to null (the bag is removed) regardless of the setting of removeEmptyBags.


removeObjectsAtLocation

public Bag removeObjectsAtLocation(Int2D location)
Removes all the objects stored at the given location and returns them as a Bag (which you are free to modify). The location is set to null (the bag is removed) regardless of the setting of removeEmptyBags.


removeObjectAtLocation

public boolean removeObjectAtLocation(java.lang.Object obj,
                                      int x,
                                      int y)

removeObjectAtLocation

public boolean removeObjectAtLocation(java.lang.Object obj,
                                      Int2D location)

removeObjectMultiplyAtLocation

public boolean removeObjectMultiplyAtLocation(java.lang.Object obj,
                                              int x,
                                              int y)

removeObjectMultiplyAtLocation

public boolean removeObjectMultiplyAtLocation(java.lang.Object obj,
                                              Int2D location)

moveObject

public boolean moveObject(java.lang.Object obj,
                          int fromX,
                          int fromY,
                          int toX,
                          int toY)
If the object is not at [fromX, fromY], then it's simply inserted into [toX, toY], and FALSE is returned. Else it is removed ONCE from [fromX, fromY] and inserted into [toX, toY] and TRUE is returned. If the object exists multiply at [fromX, fromY], only one instance of the object is moved.


moveObject

public boolean moveObject(java.lang.Object obj,
                          Int2D from,
                          Int2D to)
If the object is not at FROM, then it's simply inserted into TO, and FALSE is returned. Else it is removed ONCE from FROM and inserted into TO and TRUE is returned. If the object exists multiply at FROM, only one instance of the object is moved.


moveObjects

public void moveObjects(int fromX,
                        int fromY,
                        int toX,
                        int toY)

moveObjects

public void moveObjects(Int2D from,
                        Int2D to)

numObjectsAtLocation

public int numObjectsAtLocation(int x,
                                int y)

numObjectsAtLocation

public int numObjectsAtLocation(Int2D location)

addObjectToLocation

public void addObjectToLocation(java.lang.Object obj,
                                int x,
                                int y)
Adds an object to a given location.


addObjectToLocation

public void addObjectToLocation(java.lang.Object obj,
                                Int2D location)

addObjectsToLocation

public void addObjectsToLocation(Bag objs,
                                 int x,
                                 int y)
Adds an object to a given location.


addObjectsToLocation

public void addObjectsToLocation(Bag objs,
                                 Int2D location)

addObjectsToLocation

public void addObjectsToLocation(java.lang.Object[] objs,
                                 int x,
                                 int y)
Adds an object to a given location.


addObjectsToLocation

public void addObjectsToLocation(java.lang.Object[] objs,
                                 Int2D location)

addObjectsToLocation

public void addObjectsToLocation(java.util.Collection objs,
                                 int x,
                                 int y)
Adds an object to a given location.


clear

public final Bag clear()
Sets all the locations in the grid to null, and returns in a Bag all stored objects (including duplicates but not null values). You are free to modify the Bag.


getNeighborsMaxDistance

public final Bag getNeighborsMaxDistance(int x,
                                         int y,
                                         int dist,
                                         boolean toroidal,
                                         Bag result,
                                         IntBag xPos,
                                         IntBag yPos)
Gets all neighbors of a location that satisfy max( abs(x-X) , abs(y-Y) ) <= dist. This region forms a square 2*dist+1 cells across, centered at (X,Y). If dist==1, this is equivalent to the so-called "Moore Neighborhood" (the eight neighbors surrounding (X,Y)), plus (X,Y) itself. Places each x and y value of these locations in the provided IntBags xPos and yPos, clearing the bags first. Then places into the result Bag the objects at each of those locations clearning it first. Returns the result Bag (constructing one if null had been passed in). null may be passed in for the various bags, though it is more efficient to pass in a 'scratch bag' for each one.


getNeighborsHamiltonianDistance

public final Bag getNeighborsHamiltonianDistance(int x,
                                                 int y,
                                                 int dist,
                                                 boolean toroidal,
                                                 Bag result,
                                                 IntBag xPos,
                                                 IntBag yPos)
Gets all neighbors of a location that satisfy abs(x-X) + abs(y-Y) <= dist. This region forms a diamond 2*dist+1 cells from point to opposite point inclusive, centered at (X,Y). If dist==1 this is equivalent to the so-called "Von-Neumann Neighborhood" (the four neighbors above, below, left, and right of (X,Y)), plus (X,Y) itself. Places each x and y value of these locations in the provided IntBags xPos and yPos, clearing the bags first. Then places into the result Bag the objects at each of those locations, clearning it first. Returns the result Bag (constructing one if null had been passed in). null may be passed in for the various bags, though it is more efficient to pass in a 'scratch bag' for each one.


getNeighborsHexagonalDistance

public final Bag getNeighborsHexagonalDistance(int x,
                                               int y,
                                               int dist,
                                               boolean toroidal,
                                               Bag result,
                                               IntBag xPos,
                                               IntBag yPos)
Gets all neighbors located within the hexagon centered at (X,Y) and 2*dist+1 cells from point to opposite point inclusive. If dist==1, this is equivalent to the six neighbors immediately surrounding (X,Y), plus (X,Y) itself. Places each x and y value of these locations in the provided IntBags xPos and yPos, clearing the bags first. Then places into the result Bag the objects at each of those locations clearning it first. Returns the result Bag (constructing one if null had been passed in). null may be passed in for the various bags, though it is more efficient to pass in a 'scratch bag' for each one.