Class DoubleGrid2D
- All Implemented Interfaces:
Serializable
,Grid2D
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.
- See Also:
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Field Summary
Fields inherited from class sim.field.grid.AbstractGrid2D
height, width
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Constructor Summary
ConstructorDescriptionDoubleGrid2D
(double[][] values) DoubleGrid2D
(int width, int height) DoubleGrid2D
(int width, int height, double initialValue) DoubleGrid2D
(DoubleGrid2D values) -
Method Summary
Modifier and TypeMethodDescriptionfinal DoubleGrid2D
add
(double withThisMuch) Sets each value in the grid to that value added to withThisMuch Returns the modified grid.final DoubleGrid2D
add
(DoubleGrid2D withThis) Sets the value at each location in the grid to that value added to the value at the equivalent location in the provided grid.final DoubleGrid2D
Sets the value at each location in the grid to that value added to the value at the equivalent location in the provided grid.final DoubleGrid2D
ceiling()
Sets each value in the grid to ceil(value).final DoubleGrid2D
floor()
Sets each value in the grid to floor(value).final double
get
(int x, int y) Returns the element at location (x,y)double[][]
getField()
getHexagonalNeighbors
(int x, int y, int dist, int mode, boolean includeOrigin) Determines all locations located within the hexagon centered at (X,Y) and 2*dist+1 cells from point to opposite point inclusive.getHexagonalNeighbors
(int x, int y, int dist, int mode, boolean includeOrigin, DoubleBag 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.getMooreNeighbors
(int x, int y, int dist, int mode, boolean includeOrigin) Determines all neighbors of a location that satisfy max( abs(x-X) , abs(y-Y) ) invalid input: '<'= dist.getMooreNeighbors
(int x, int y, int dist, int mode, boolean includeOrigin, DoubleBag result, IntBag xPos, IntBag yPos) Gets all neighbors of a location that satisfy max( abs(x-X) , abs(y-Y) ) invalid input: '<'= dist, This region forms a square 2*dist+1 cells across, centered at (X,Y).void
getNeighborsHamiltonianDistance
(int x, int y, int dist, boolean toroidal, DoubleBag result, IntBag xPos, IntBag yPos) Deprecated.void
getNeighborsHexagonalDistance
(int x, int y, int dist, boolean toroidal, DoubleBag result, IntBag xPos, IntBag yPos) Deprecated.void
getNeighborsMaxDistance
(int x, int y, int dist, boolean toroidal, DoubleBag result, IntBag xPos, IntBag yPos) Deprecated.getRadialNeighbors
(int x, int y, double dist, int mode, boolean includeOrigin) getRadialNeighbors
(int x, int y, double dist, int mode, boolean includeOrigin, int measurementRule, boolean closed, DoubleBag result, IntBag xPos, IntBag yPos) getRadialNeighbors
(int x, int y, double dist, int mode, boolean includeOrigin, DoubleBag result, IntBag xPos, IntBag yPos) getVonNeumannNeighbors
(int x, int y, int dist, int mode, boolean includeOrigin) Determines all neighbors of a location that satisfy abs(x-X) + abs(y-Y) invalid input: '<'= dist.getVonNeumannNeighbors
(int x, int y, int dist, int mode, boolean includeOrigin, DoubleBag result, IntBag xPos, IntBag yPos) Gets all neighbors of a location that satisfy abs(x-X) + abs(y-Y) invalid input: '<'= dist.final DoubleGrid2D
lowerBound
(double toNoLowerThanThisMuch) Thresholds the grid so that values smaller than toNoLowerThanThisMuch are changed to toNoLowerThanThisMuch Returns the modified grid.final double
max()
Returns the maximum value stored in the gridfinal double
mean()
Returns the mean value stored in the gridfinal double
min()
Returns the minimum value stored in the gridfinal DoubleGrid2D
multiply
(double byThisMuch) Sets each value in the grid to that value multiplied byThisMuch Returns the modified grid.final DoubleGrid2D
multiply
(DoubleGrid2D withThis) Sets the value at each location in the grid to that value multiplied by to the value at the equivalent location in the provided grid.final DoubleGrid2D
Sets the value at each location in the grid to that value multiplied by to the value at the equivalent location in the provided grid.final void
replaceAll
(double from, double to) Replace instances of one value to another.void
reshape
(int width, int height) Entirely wipes the grid and reshapes it into a different sized rectangle.final DoubleGrid2D
rint()
Sets each value in the grid to rint(value).final void
set
(int x, int y, double val) Sets location (x,y) to valfinal DoubleGrid2D
setTo
(double thisMuch) Sets all the locations in the grid the provided elementsetTo
(double[][] field) Sets the grid to a copy of the provided array, which must be rectangular.final DoubleGrid2D
setTo
(DoubleGrid2D values) Changes the dimensions of the grid to be the same as the one provided, then sets all the locations in the grid to the elements at the quivalent locations in the provided grid.final double[]
toArray()
Flattens the grid to a one-dimensional array, storing the elements in row-major order,including duplicates and null values.final DoubleGrid2D
truncate()
Eliminates the decimal portion of each value in the grid (rounds towards zero).final DoubleGrid2D
upperBound
(double toNoMoreThanThisMuch) Thresholds the grid so that values greater to toNoMoreThanThisMuch are changed to toNoMoreThanThisMuch.Methods inherited from class sim.field.grid.AbstractGrid2D
buildMap, buildMap, checkBounds, dlx, dly, downx, downy, drx, dry, getHeight, getHexagonalLocations, getMooreLocations, getNeighborsHamiltonianDistance, getNeighborsHexagonalDistance, getNeighborsMaxDistance, getRadialLocations, getRadialLocations, getVonNeumannLocations, getWidth, isDistributed, removeOrigin, removeOriginToroidal, stx, sty, trb, trt, tx, ty, ulx, uly, upx, upy, urx, ury
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Field Details
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field
public double[][] field
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Constructor Details
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DoubleGrid2D
public DoubleGrid2D(int width, int height) -
DoubleGrid2D
public DoubleGrid2D(int width, int height, double initialValue) -
DoubleGrid2D
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DoubleGrid2D
public DoubleGrid2D(double[][] values)
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Method Details
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getField
public double[][] getField() -
reshape
public void reshape(int width, int height) Description copied from interface:Grid2D
Entirely wipes the grid and reshapes it into a different sized rectangle. You should generally not call this: it's used for exotic purposes such as in Distributed MASON.- Specified by:
reshape
in interfaceGrid2D
- Overrides:
reshape
in classAbstractGrid2D
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set
public final void set(int x, int y, double val) Sets location (x,y) to val -
get
public final double get(int x, int y) Returns the element at location (x,y) -
setTo
Sets all the locations in the grid the provided element -
setTo
Sets the grid to a copy of the provided array, which must be rectangular. -
setTo
Changes the dimensions of the grid to be the same as the one provided, then sets all the locations in the grid to the elements at the quivalent locations in the provided grid. -
toArray
public final double[] toArray()Flattens the grid to a one-dimensional array, storing the elements in row-major order,including duplicates and null values. Returns the grid. -
max
public final double max()Returns the maximum value stored in the grid -
min
public final double min()Returns the minimum value stored in the grid -
mean
public final double mean()Returns the mean value stored in the grid -
upperBound
Thresholds the grid so that values greater to toNoMoreThanThisMuch are changed to toNoMoreThanThisMuch. Returns the modified grid. -
lowerBound
Thresholds the grid so that values smaller than toNoLowerThanThisMuch are changed to toNoLowerThanThisMuch Returns the modified grid. -
add
Sets each value in the grid to that value added to withThisMuch Returns the modified grid. -
add
Sets the value at each location in the grid to that value added to the value at the equivalent location in the provided grid. Returns the modified grid. -
add
Sets the value at each location in the grid to that value added to the value at the equivalent location in the provided grid. Returns the modified grid. -
multiply
Sets each value in the grid to that value multiplied byThisMuch Returns the modified grid. -
multiply
Sets the value at each location in the grid to that value multiplied by to the value at the equivalent location in the provided grid. Returns the modified grid. -
multiply
Sets the value at each location in the grid to that value multiplied by to the value at the equivalent location in the provided grid. Returns the modified grid. -
floor
Sets each value in the grid to floor(value). Returns the modified grid. -
ceiling
Sets each value in the grid to ceil(value). Returns the modified grid. -
truncate
Eliminates the decimal portion of each value in the grid (rounds towards zero). Returns the modified grid. -
rint
Sets each value in the grid to rint(value). That is, each value is rounded to the closest integer value. If two integers are the same distance, the value is rounded to the even integer. Returns the modified grid. -
replaceAll
public final void replaceAll(double from, double to) Replace instances of one value to another.- Parameters:
from
- any element that matches this value will be replacedto
- with this value
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getNeighborsMaxDistance
public void getNeighborsMaxDistance(int x, int y, int dist, boolean toroidal, DoubleBag result, IntBag xPos, IntBag yPos) Deprecated.Gets all neighbors of a location that satisfy max( abs(x-X) , abs(y-Y) ) invalid input: '<'= 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 DoubleBag any Objects which fall on one of these invalid input: '<'x,y> locations, clearning it first. Note that the order and size of the result DoubleBag may not correspond to the X and Y bags. If you want all three bags to correspond (x, y, object) then use getNeighborsAndCorrespondingPositionsMaxDistance(...) Returns the result DoubleBag. null may be passed in for the various bags, though it is more efficient to pass in a 'scratch bag' for each one.
This function may only run in two modes: toroidal or bounded. Unbounded lookup is not permitted, and so this function is deprecated: instead you should use the other version of this function which has more functionality. If "bounded", then the neighbors are restricted to be only those which lie within the box ranging from (0,0) to (width, height), that is, the width and height of the grid. if "toroidal", then the environment is assumed to be toroidal, that is, wrap-around, and neighbors are computed in this fashion. Toroidal locations will not appear multiple times: specifically, if the neighborhood distance is so large that it wraps completely around the width or height of the box, neighbors will not be counted multiple times. Note that to ensure this, subclasses may need to resort to expensive duplicate removal, so it's not suggested you use so unreasonably large distances.
The origin -- that is, the (x,y) point at the center of the neighborhood -- is always included in the results.
This function is equivalent to: getNeighborsMaxDistance(x,y,dist,toroidal ? Grid2D.TOROIDAL : Grid2D.BOUNDED, true, result, xPos, yPos);
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getMooreNeighbors
public DoubleBag getMooreNeighbors(int x, int y, int dist, int mode, boolean includeOrigin, DoubleBag result, IntBag xPos, IntBag yPos) Gets all neighbors of a location that satisfy max( abs(x-X) , abs(y-Y) ) invalid input: '<'= 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 DoubleBag any Objects which fall on one of these invalid input: '<'x,y> locations, clearning it first. Note that the order and size of the result DoubleBag may not correspond to the X and Y bags. If you want all three bags to correspond (x, y, object) then use getNeighborsAndCorrespondingPositionsMaxDistance(...) Returns the result DoubleBag. null may be passed in for the various bags, though it is more efficient to pass in a 'scratch bag' for each one.
This function may be run in one of three modes: Grid2D.BOUNDED, Grid2D.UNBOUNDED, and Grid2D.TOROIDAL. If "bounded", then the neighbors are restricted to be only those which lie within the box ranging from (0,0) to (width, height), that is, the width and height of the grid. If "unbounded", then the neighbors are not so restricted. Note that unbounded neighborhood lookup only makes sense if your grid allows locations to actually be outside this box. For example, SparseGrid2D permits this but ObjectGrid2D and DoubleGrid2D and IntGrid2D and DenseGrid2D do not. Finally if "toroidal", then the environment is assumed to be toroidal, that is, wrap-around, and neighbors are computed in this fashion. Toroidal locations will not appear multiple times: specifically, if the neighborhood distance is so large that it wraps completely around the width or height of the box, neighbors will not be counted multiple times. Note that to ensure this, subclasses may need to resort to expensive duplicate removal, so it's not suggested you use so unreasonably large distances.
You can also opt to include the origin -- that is, the (x,y) point at the center of the neighborhood -- in the neighborhood results.
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getNeighborsHamiltonianDistance
public void getNeighborsHamiltonianDistance(int x, int y, int dist, boolean toroidal, DoubleBag result, IntBag xPos, IntBag yPos) Deprecated.Gets all neighbors of a location that satisfy abs(x-X) + abs(y-Y) invalid input: '<'= 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 DoubleBag any Objects which fall on one of these invalid input: '<'x,y> locations, clearning it first. Note that the order and size of the result DoubleBag may not correspond to the X and Y bags. If you want all three bags to correspond (x, y, object) then use getNeighborsAndCorrespondingPositionsHamiltonianDistance(...) Returns the result DoubleBag (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.
This function may only run in two modes: toroidal or bounded. Unbounded lookup is not permitted, and so this function is deprecated: instead you should use the other version of this function which has more functionality. If "bounded", then the neighbors are restricted to be only those which lie within the box ranging from (0,0) to (width, height), that is, the width and height of the grid. if "toroidal", then the environment is assumed to be toroidal, that is, wrap-around, and neighbors are computed in this fashion. Toroidal locations will not appear multiple times: specifically, if the neighborhood distance is so large that it wraps completely around the width or height of the box, neighbors will not be counted multiple times. Note that to ensure this, subclasses may need to resort to expensive duplicate removal, so it's not suggested you use so unreasonably large distances.
The origin -- that is, the (x,y) point at the center of the neighborhood -- is always included in the results.
This function is equivalent to: getNeighborsHamiltonianDistance(x,y,dist,toroidal ? Grid2D.TOROIDAL : Grid2D.BOUNDED, true, result, xPos, yPos);
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getVonNeumannNeighbors
public DoubleBag getVonNeumannNeighbors(int x, int y, int dist, int mode, boolean includeOrigin, DoubleBag result, IntBag xPos, IntBag yPos) Gets all neighbors of a location that satisfy abs(x-X) + abs(y-Y) invalid input: '<'= 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 DoubleBag any Objects which fall on one of these invalid input: '<'x,y> locations, clearning it first. Note that the order and size of the result DoubleBag may not correspond to the X and Y bags. If you want all three bags to correspond (x, y, object) then use getNeighborsAndCorrespondingPositionsHamiltonianDistance(...) Returns the result DoubleBag (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.
This function may be run in one of three modes: Grid2D.BOUNDED, Grid2D.UNBOUNDED, and Grid2D.TOROIDAL. If "bounded", then the neighbors are restricted to be only those which lie within the box ranging from (0,0) to (width, height), that is, the width and height of the grid. If "unbounded", then the neighbors are not so restricted. Note that unbounded neighborhood lookup only makes sense if your grid allows locations to actually be outside this box. For example, SparseGrid2D permits this but ObjectGrid2D and DoubleGrid2D and IntGrid2D and DenseGrid2D do not. Finally if "toroidal", then the environment is assumed to be toroidal, that is, wrap-around, and neighbors are computed in this fashion. Toroidal locations will not appear multiple times: specifically, if the neighborhood distance is so large that it wraps completely around the width or height of the box, neighbors will not be counted multiple times. Note that to ensure this, subclasses may need to resort to expensive duplicate removal, so it's not suggested you use so unreasonably large distances.
You can also opt to include the origin -- that is, the (x,y) point at the center of the neighborhood -- in the neighborhood results.
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getNeighborsHexagonalDistance
public void getNeighborsHexagonalDistance(int x, int y, int dist, boolean toroidal, DoubleBag result, IntBag xPos, IntBag yPos) Deprecated.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 DoubleBag any Objects which fall on one of these invalid input: '<'x,y> locations, clearning it first. Note that the order and size of the result DoubleBag may not correspond to the X and Y bags. If you want all three bags to correspond (x, y, object) then use getNeighborsAndCorrespondingPositionsHamiltonianDistance(...) Returns the result DoubleBag (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.
This function may only run in two modes: toroidal or bounded. Unbounded lookup is not permitted, and so this function is deprecated: instead you should use the other version of this function which has more functionality. If "bounded", then the neighbors are restricted to be only those which lie within the box ranging from (0,0) to (width, height), that is, the width and height of the grid. if "toroidal", then the environment is assumed to be toroidal, that is, wrap-around, and neighbors are computed in this fashion. Toroidal locations will not appear multiple times: specifically, if the neighborhood distance is so large that it wraps completely around the width or height of the box, neighbors will not be counted multiple times. Note that to ensure this, subclasses may need to resort to expensive duplicate removal, so it's not suggested you use so unreasonably large distances.
The origin -- that is, the (x,y) point at the center of the neighborhood -- is always included in the results.
This function is equivalent to: getNeighborsHexagonalDistance(x,y,dist,toroidal ? Grid2D.TOROIDAL : Grid2D.BOUNDED, true, result, xPos, yPos);
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getHexagonalNeighbors
public DoubleBag getHexagonalNeighbors(int x, int y, int dist, int mode, boolean includeOrigin, DoubleBag 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 DoubleBag any Objects which fall on one of these invalid input: '<'x,y> locations, clearning it first. Note that the order and size of the result DoubleBag may not correspond to the X and Y bags. If you want all three bags to correspond (x, y, object) then use getNeighborsAndCorrespondingPositionsHamiltonianDistance(...) Returns the result DoubleBag (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.
This function may be run in one of three modes: Grid2D.BOUNDED, Grid2D.UNBOUNDED, and Grid2D.TOROIDAL. If "bounded", then the neighbors are restricted to be only those which lie within the box ranging from (0,0) to (width, height), that is, the width and height of the grid. If "unbounded", then the neighbors are not so restricted. Note that unbounded neighborhood lookup only makes sense if your grid allows locations to actually be outside this box. For example, SparseGrid2D permits this but ObjectGrid2D and DoubleGrid2D and IntGrid2D and DenseGrid2D do not. Finally if "toroidal", then the environment is assumed to be toroidal, that is, wrap-around, and neighbors are computed in this fashion. Toroidal locations will not appear multiple times: specifically, if the neighborhood distance is so large that it wraps completely around the width or height of the box, neighbors will not be counted multiple times. Note that to ensure this, subclasses may need to resort to expensive duplicate removal, so it's not suggested you use so unreasonably large distances.
You can also opt to include the origin -- that is, the (x,y) point at the center of the neighborhood -- in the neighborhood results.
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getRadialNeighbors
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getRadialNeighbors
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getMooreNeighbors
Determines all neighbors of a location that satisfy max( abs(x-X) , abs(y-Y) ) invalid input: '<'= 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.Then returns, as a Bag, any Objects which fall on one of these invalid input: '<'x,y> locations.
This function may be run in one of three modes: Grid2D.BOUNDED, Grid2D.UNBOUNDED, and Grid2D.TOROIDAL. If "bounded", then the neighbors are restricted to be only those which lie within the box ranging from (0,0) to (width, height), that is, the width and height of the grid. If "unbounded", then the neighbors are not so restricted. Note that unbounded neighborhood lookup only makes sense if your grid allows locations to actually be outside this box. For example, SparseGrid2D permits this but ObjectGrid2D and DoubleGrid2D and IntGrid2D and DenseGrid2D do not. Finally if "toroidal", then the environment is assumed to be toroidal, that is, wrap-around, and neighbors are computed in this fashion. Toroidal locations will not appear multiple times: specifically, if the neighborhood distance is so large that it wraps completely around the width or height of the box, neighbors will not be counted multiple times. Note that to ensure this, subclasses may need to resort to expensive duplicate removal, so it's not suggested you use so unreasonably large distances.
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getVonNeumannNeighbors
Determines all neighbors of a location that satisfy abs(x-X) + abs(y-Y) invalid input: '<'= 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.Then returns, as a Bag, any Objects which fall on one of these invalid input: '<'x,y> locations.
This function may be run in one of three modes: Grid2D.BOUNDED, Grid2D.UNBOUNDED, and Grid2D.TOROIDAL. If "bounded", then the neighbors are restricted to be only those which lie within the box ranging from (0,0) to (width, height), that is, the width and height of the grid. If "unbounded", then the neighbors are not so restricted. Note that unbounded neighborhood lookup only makes sense if your grid allows locations to actually be outside this box. For example, SparseGrid2D permits this but ObjectGrid2D and DoubleGrid2D and IntGrid2D and DenseGrid2D do not. Finally if "toroidal", then the environment is assumed to be toroidal, that is, wrap-around, and neighbors are computed in this fashion. Toroidal locations will not appear multiple times: specifically, if the neighborhood distance is so large that it wraps completely around the width or height of the box, neighbors will not be counted multiple times. Note that to ensure this, subclasses may need to resort to expensive duplicate removal, so it's not suggested you use so unreasonably large distances.
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getHexagonalNeighbors
Determines all locations 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 neighboring locations immediately surrounding (X,Y), plus (X,Y) itself.Then returns, as a Bag, any Objects which fall on one of these invalid input: '<'x,y> locations.
This function may be run in one of three modes: Grid2D.BOUNDED, Grid2D.UNBOUNDED, and Grid2D.TOROIDAL. If "bounded", then the neighbors are restricted to be only those which lie within the box ranging from (0,0) to (width, height), that is, the width and height of the grid. If "unbounded", then the neighbors are not so restricted. Note that unbounded neighborhood lookup only makes sense if your grid allows locations to actually be outside this box. For example, SparseGrid2D permits this but ObjectGrid2D and DoubleGrid2D and IntGrid2D and DenseGrid2D do not. Finally if "toroidal", then the environment is assumed to be toroidal, that is, wrap-around, and neighbors are computed in this fashion. Toroidal locations will not appear multiple times: specifically, if the neighborhood distance is so large that it wraps completely around the width or height of the box, neighbors will not be counted multiple times. Note that to ensure this, subclasses may need to resort to expensive duplicate removal, so it's not suggested you use so unreasonably large distances.
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getRadialNeighbors
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