Need help implementing this Java class

public class SquareMap extends GraphMap 

A square lattice where each cell has 4 neighbors set up in a checker board pattern.

Every Cell (the colored squares) in the SquareMap has an column and row index into a 2D array

holding the cells. In Fig. 5, the top left cell has the index (column, row) = (0, 0), and its neighbor

to the right has (1, 0), and so on. The neighbors for a cell at index (column, row) shall constitute

the following if they're within the map:

1. The cell at index (col-1, row)

2. The cell at index (col+1, row)

3. The cell at index (col, row-1)

4. The cell at index (col, row+1)

Depending on the cell's index in the 2D array, it can have as few as two neighbors and as many

as four. (Note: here we're describing cell indices using the pairs (horizontal, vertical) as in

mathematical coordinates. Remember when you access elements of the 2D array, you have

to reverse them, since for a 2D array the row index is first.)

In addition to its column and row index, each cell is associated with a location in pixels within a

graphical window. Pixels are measured from the upper left corner. The GraphMap class

includes an attribute distance representing the size in pixels of each Cell. When creating

Polygons for each cell, the coordinates in pixels shall follow the scheme shown in Fig. 5. There

shall be an empty border around the cells with width of distance/2. The createPolygon method

then shall return a square with width distance. The orange dot in Fig. 5 represents the point (0,

0) in pixels. For any point in pixels, the selectClosetIndex method shall return the cell's column

and row if the given (x, y) is within its square. For example, focus on the pink dot in Fig. 5:

Let's say that distance equals 10, and let's say that the pink dot belongs to the point (19,

21) in pixels. Then the closest column and row would be (1, 1). A point on the boundary

between cells is assumed to belong to the square to the right and/or below.

Finally, the width of the GraphMap in pixels shall equal the sum of the widths of the polygons

we need to draw in a row, plus the empty border on either side of the row. The height shall work

similarly.

Constructor Summary

Constructor and Description

SquareMap()

Method Summary

All MethodsInstance MethodsConcrete Methods

Modifier and Type	Method and Description
Cell[]	createNeighbors(int col, int row) Create an array of neighbors for the cell with given column and row.
java.awt.Polygon	createPolygon(int col, int row) Create a polygon for the cell with the given column and row.
int	getPixelHeight() Gets the height of the window in pixels for rendering, including the border area.
int	getPixelWidth() Gets the width of the window in pixels for rendering, including the border area.
protected java.awt.Point	selectClosestIndex(int x, int y) Get the column and row indices for the cell closest to a given pixel (x, y) coordinate, returned as a Point object in which x is the column and y is the row.

Methods inherited from class graph.GraphMap

clearAllDistances, createFood, getCells, getDistance, initialize, initialize, iterator,selectClosestCell, setColorGenerator, setCreateFood, setDistance, update, updateMouse

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Constructor Detail

SquareMap

public SquareMap() 

Method Detail

getPixelWidth

public int getPixelWidth() 

Description copied from class: GraphMap

Gets the width of the window in pixels for rendering, including the border area.

Specified by:

getPixelWidth in class GraphMap

Returns:

The width in pixels

getPixelHeight

public int getPixelHeight() 

Description copied from class: GraphMap

Gets the height of the window in pixels for rendering, including the border area.

Specified by:

getPixelHeight in class GraphMap

Returns:

The height in pixels

createNeighbors

public Cell[] createNeighbors(int col, int row) 

Description copied from class: GraphMap

Create an array of neighbors for the cell with given column and row.

Specified by:

createNeighbors in class GraphMap

Parameters:

col - The column index of a Cell

row - The row index of a Cell

Returns:

An array containing adjacent cells

selectClosestIndex

protected java.awt.Point selectClosestIndex(int x, int y) 

Description copied from class: GraphMap

Get the column and row indices for the cell closest to a given pixel (x, y) coordinate, returned as a Point object in which x is the column and y is the row.

Specified by:

selectClosestIndex in class GraphMap

Parameters:

x - The x coordinate in pixels

y - The y coordinate in pixels

Returns:

column and row indices for the cell closest to the given (x, y)

createPolygon

public java.awt.Polygon createPolygon(int col, int row) 

Description copied from class: GraphMap

Create a polygon for the cell with the given column and row.

Specified by:

createPolygon in class GraphMap

Parameters:

col - The column index of a Cell

row - The row index of a Cell

Returns:

A polygon with correct pixel coordinates for rendering the cell