ro.sync.exml.view.graphics

Class Polygon

java.lang.Object

ro.sync.exml.view.graphics.Polygon

All Implemented Interfaces:

Shape

@API(type=EXTENDABLE,
     src=PRIVATE)
public class Polygon
extends java.lang.Object
implements Shape

The Polygon class encapsulates a description of a closed, two-dimensional region within a coordinate space.

Field Summary

Fields

Modifier and Type	Field and Description
int	npoints The total number of points.
int[]	xpoints The array of x coordinates.
int[]	ypoints The array of y coordinates.

Constructor Summary

Constructors

Constructor and Description
Polygon() Creates an empty polygon.
Polygon(int[] xpoints, int[] ypoints, int npoints) Constructs and initializes a Polygon from the specified parameters.

Method Summary

Methods

Modifier and Type	Method and Description
void	addPoint(int x, int y) Appends the specified coordinates to this Polygon.
Rectangle	getBounds()
Shape	translate(int tx, int ty) Translate the shape into another one.

Methods inherited from class java.lang.Object

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

Field Detail

npoints

public int npoints

The total number of points. The value of npoints represents the number of valid points in this Polygon and might be less than the number of elements in xpoints or ypoints. This value can be NULL.

See Also:

addPoint(int, int)

xpoints

public int[] xpoints

The array of x coordinates. The number of elements in this array might be more than the number of x coordinates in this Polygon. The extra elements allow new points to be added to this Polygon without re-creating this array. The value of npoints is equal to the number of valid points in this Polygon.

See Also:

addPoint(int, int)

ypoints

public int[] ypoints

The array of y coordinates. The number of elements in this array might be more than the number of y coordinates in this Polygon. The extra elements allow new points to be added to this Polygon without re-creating this array. The value of npoints is equal to the number of valid points in this Polygon.

See Also:

addPoint(int, int)

Constructor Detail

Polygon

public Polygon()

Creates an empty polygon.

Polygon

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

Constructs and initializes a Polygon from the specified parameters.

Parameters:

xpoints - an array of x coordinates

ypoints - an array of y coordinates

npoints - the total number of points in the Polygon

Throws:

java.lang.NegativeArraySizeException - if the value of npoints is negative.

java.lang.IndexOutOfBoundsException - if npoints is greater than the length of xpoints or the length of ypoints.

java.lang.NullPointerException - if xpoints or ypoints is null.

Method Detail

addPoint

public void addPoint(int x,
            int y)

Appends the specified coordinates to this Polygon.

If an operation that calculates the bounding box of this Polygon has already been performed, such as getBounds or contains, then this method updates the bounding box.

Parameters:

x - the specified x coordinate

y - the specified y coordinate

See Also:

Polygon.getBounds()

getBounds

public Rectangle getBounds()

Specified by:

getBounds in interface Shape

Returns:

The bounds of this shape.

See Also:

Shape.getBounds()

translate

public Shape translate(int tx,
              int ty)

Description copied from interface: Shape

Translate the shape into another one.

Specified by:

translate in interface Shape

Parameters:

tx - the distance by which coordinates are translated in the X axis direction

ty - the distance by which coordinates are translated in the Y axis direction

Returns:

The newly translated shape

See Also:

Shape.translate(int, int)