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Class java.awt.Polygon

java.lang.Object
   |
   +----java.awt.Polygon

public class Polygon

extends Object

npoints

The total number of points.

xpoints

The array of x coordinates.

ypoints

The array of y coordinates.

Polygon()

Creates an empty polygon.

Polygon(int[], int[], int)

Constructs and initializes a Polygon from the specified parameters.

addPoint(int, int)

Appends a point to a polygon.

getBoundingBox()

getBoundingBox() - what area does this polygon span?

inside(int, int)

Is point (x, y) inside the polygon? Uses an even-odd insideness rule (otherwise known as an alternating rule).

  public int npoints

The total number of points.

  public int xpoints[]

The array of x coordinates.

  public int ypoints[]

The array of y coordinates.

  public Polygon()

Creates an empty polygon.

  public Polygon(int xpoints[],
                 int ypoints[],
                 int npoints)

Constructs and initializes a Polygon from the specified parameters.

Parameters:

xpoints - the array of x coordinates

ypoints - the array of y coordinates

npoints - the total number of points in the Polygon

  public void addPoint(int x,
                       int y)

Appends a point to a polygon. If inside(x, y) or other operation that calculates the bounding box has already been performed, this updates the bounds accordingly.

Parameters:

x - the x coordinate of the point

y - the y coordinate of the point

  public Rectangle getBoundingBox()

getBoundingBox() - what area does this polygon span?

Returns:

a Rectangle defining the bounds of the Polygon.

  public boolean inside(int x,
                        int y)

Is point (x, y) inside the polygon? Uses an even-odd insideness rule (otherwise known as an alternating rule).

Parameters:

x - the X coordinate of the point to be tested

y - the Y coordinate of the point to be tested Based on code by Hanpeter van Vliet .

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