org.jhotdraw.geom
Class Polygon2D.Double

java.lang.Object
  org.jhotdraw.geom.Polygon2D
      org.jhotdraw.geom.Polygon2D.Double

All Implemented Interfaces:

java.awt.Shape, java.io.Serializable, java.lang.Cloneable

Enclosing class:

Polygon2D

public static class Polygon2D.Double
extends Polygon2D
implements java.io.Serializable

The Double class defines a polygon with coordinates stored in double precision floating point.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.jhotdraw.geom.Polygon2D

Polygon2D.Double, Polygon2D.Float

Field Summary

protected java.awt.geom.Rectangle2D.Double	bounds The bounds of this Polygon.
double[]	xpoints The array of X coordinates.
double[]	ypoints The array of Y coordinates.

Fields inherited from class org.jhotdraw.geom.Polygon2D

npoints

Constructor Summary

Polygon2D.Double()

Polygon2D.Double(double[] xpoints, double[] ypoints, int npoints)
Constructs and initializes a Polygon from the specified parameters.

Method Summary

void	addPoint(double x, double y) Appends the specified coordinates to this Polygon.
boolean	contains(double x, double y)
boolean	contains(double x, double y, double w, double h)
java.awt.Rectangle	getBounds() Gets the bounding box of this Polygon.
java.awt.geom.Rectangle2D	getBounds2D()
java.awt.geom.PathIterator	getPathIterator(java.awt.geom.AffineTransform at) Returns an iterator object that iterates along the boundary of this Polygon and provides access to the geometry of the outline of this Polygon.
boolean	intersects(double x, double y, double w, double h)
void	invalidate() Invalidates or flushes any internally-cached data that depends on the vertex coordinates of this Polygon.
void	translate(double deltaX, double deltaY) Translates the vertices of the Polygon by deltaX along the x axis and by deltaY along the y axis.

Methods inherited from class org.jhotdraw.geom.Polygon2D

add, contains, contains, contains, contains, getPathIterator, intersects, reset

Methods inherited from class java.lang.Object

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

Field Detail

xpoints

public double[] 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.

ypoints

public double[] 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.

bounds

protected java.awt.geom.Rectangle2D.Double bounds

The bounds of this Polygon. This value can be null.

Constructor Detail

Polygon2D.Double

public Polygon2D.Double()

Polygon2D.Double

public Polygon2D.Double(double[] xpoints,
                        double[] 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

translate

public void translate(double deltaX,
                      double deltaY)

Translates the vertices of the Polygon by deltaX along the x axis and by deltaY along the y axis.

Specified by:

translate in class Polygon2D

Parameters:

deltaX - the amount to translate along the X axis

deltaY - the amount to translate along the Y axis

invalidate

public void invalidate()

Description copied from class: Polygon2D

Invalidates or flushes any internally-cached data that depends on the vertex coordinates of this Polygon. This method should be called after any direct manipulation of the coordinates in the xpoints or ypoints arrays to avoid inconsistent results from methods such as getBounds or contains that might cache data from earlier computations relating to the vertex coordinates.

Specified by:

invalidate in class Polygon2D

See Also:

Polygon.getBounds()

contains

public boolean contains(double x,
                        double y)

Description copied from class: Polygon2D

Specified by:

contains in interface java.awt.Shape

Specified by:

contains in class Polygon2D

intersects

public boolean intersects(double x,
                          double y,
                          double w,
                          double h)

Description copied from class: Polygon2D

Specified by:

intersects in interface java.awt.Shape

Specified by:

intersects in class Polygon2D

addPoint

public void addPoint(double x,
                     double y)

Description copied from class: Polygon2D

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.

Specified by:

addPoint in class Polygon2D

Parameters:

x - the specified X coordinate

y - the specified Y coordinate

See Also:

Polygon.getBounds(), Polygon.contains(java.awt.Point)

getBounds

public java.awt.Rectangle getBounds()

Description copied from class: Polygon2D

Gets the bounding box of this Polygon. The bounding box is the smallest Rectangle whose sides are parallel to the x and y axes of the coordinate space, and can completely contain the Polygon.

Specified by:

getBounds in interface java.awt.Shape

Overrides:

getBounds in class Polygon2D

Returns:

a Rectangle that defines the bounds of this Polygon.

getBounds2D

public java.awt.geom.Rectangle2D getBounds2D()

Description copied from class: Polygon2D

Specified by:

getBounds2D in interface java.awt.Shape

Specified by:

getBounds2D in class Polygon2D

contains

public boolean contains(double x,
                        double y,
                        double w,
                        double h)

Description copied from class: Polygon2D

Specified by:

contains in interface java.awt.Shape

Specified by:

contains in class Polygon2D

getPathIterator

public java.awt.geom.PathIterator getPathIterator(java.awt.geom.AffineTransform at)

Description copied from class: Polygon2D

Returns an iterator object that iterates along the boundary of this Polygon and provides access to the geometry of the outline of this Polygon. An optional AffineTransform can be specified so that the coordinates returned in the iteration are transformed accordingly.

Specified by:

getPathIterator in interface java.awt.Shape

Specified by:

getPathIterator in class Polygon2D

Parameters:

at - an optional AffineTransform to be applied to the coordinates as they are returned in the iteration, or null if untransformed coordinates are desired

Returns:

a PathIterator object that provides access to the geometry of this Polygon.