icy.type.geom

Class Polyline2D

java.lang.Object

icy.type.geom.Polyline2D

All Implemented Interfaces:

java.awt.Shape, java.lang.Cloneable

public class Polyline2D
extends java.lang.Object
implements java.awt.Shape, java.lang.Cloneable

This class has the same behavior than Polygon2D, except that the figure is not closed.

Field Summary

Fields

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

Constructor Summary

Constructors

Constructor and Description
Polyline2D() Creates an empty Polyline2D.
Polyline2D(double[] xpoints, double[] ypoints, int npoints) Constructs and initializes a Polyline2D from the specified parameters.
Polyline2D(int[] xpoints, int[] ypoints, int npoints) Constructs and initializes a Polyline2D from the specified parameters.
Polyline2D(java.awt.geom.Line2D line)

Method Summary

Methods

Modifier and Type	Method and Description
void	addPoint(double x, double y) Appends the specified coordinates to this Polyline2D.
void	addPoint(java.awt.geom.Point2D p)
void	calculatePath()
java.lang.Object	clone()
boolean	contains(double x, double y) Determines if the specified coordinates are inside this Polyline2D.
boolean	contains(double x, double y, double w, double h) Tests if the interior of this Polyline2D entirely contains the specified set of rectangular coordinates.
boolean	contains(int x, int y) Determines whether the specified coordinates are inside this Polyline2D.
boolean	contains(java.awt.Point p) Determines whether the specified Point is inside this Polyline2D.
boolean	contains(java.awt.geom.Point2D p) Tests if a specified Point2D is inside the boundary of this Polyline2D.
boolean	contains(java.awt.geom.Rectangle2D r) Tests if the interior of this Polyline2D entirely contains the specified Rectangle2D.
java.awt.Rectangle	getBounds() Gets the bounding box of this Polyline2D.
java.awt.geom.Rectangle2D	getBounds2D() Returns the high precision bounding box of the Shape.
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.
java.awt.geom.PathIterator	getPathIterator(java.awt.geom.AffineTransform at, double flatness) Returns an iterator object that iterates along the boundary of the Shape and provides access to the geometry of the outline of the Shape.
Polygon2D	getPolygon2D()
boolean	intersects(double x, double y, double w, double h) Tests if the interior of this Polygon intersects the interior of a specified set of rectangular coordinates.
boolean	intersects(java.awt.geom.Rectangle2D r) Tests if the interior of this Polygon intersects the interior of a specified Rectangle2D.
void	reset() Resets this Polyline2D object to an empty polygon.

Methods inherited from class java.lang.Object

equals, 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 points in this Polyline2D.

xpoints

public double[] xpoints

The array of x coordinates. The value of npoints is equal to the number of points in this Polyline2D.

ypoints

public double[] ypoints

The array of y coordinates. The value of npoints is equal to the number of points in this Polyline2D.

Constructor Detail

Polyline2D

public Polyline2D()

Creates an empty Polyline2D.

Polyline2D

public Polyline2D(double[] xpoints,
          double[] ypoints,
          int npoints)

Constructs and initializes a Polyline2D 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 Polyline2D

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.

Polyline2D

public Polyline2D(int[] xpoints,
          int[] ypoints,
          int npoints)

Constructs and initializes a Polyline2D 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 Polyline2D

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.

Polyline2D

public Polyline2D(java.awt.geom.Line2D line)

Method Detail

reset

public void reset()

Resets this Polyline2D object to an empty polygon. The coordinate arrays and the data in them are left untouched but the number of points is reset to zero to mark the old vertex data as invalid and to start accumulating new vertex data at the beginning. All internally-cached data relating to the old vertices are discarded. Note that since the coordinate arrays from before the reset are reused, creating a new empty Polyline2D might be more memory efficient than resetting the current one if the number of vertices in the new polyline data is significantly smaller than the number of vertices in the data from before the reset.

clone

public java.lang.Object clone()

Overrides:

clone in class java.lang.Object

calculatePath

public void calculatePath()

addPoint

public void addPoint(java.awt.geom.Point2D p)

addPoint

public void addPoint(double x,
            double y)

Appends the specified coordinates to this Polyline2D.

If an operation that calculates the bounding box of this Polyline2D 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(), Polygon.contains(double,double)

getBounds2D

public java.awt.geom.Rectangle2D getBounds2D()

Returns the high precision bounding box of the Shape.

Specified by:

getBounds2D in interface java.awt.Shape

Returns:

a Rectangle2D that precisely bounds the Shape.

getBounds

public java.awt.Rectangle getBounds()

Gets the bounding box of this Polyline2D. 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 Polyline2D.

Specified by:

getBounds in interface java.awt.Shape

Returns:

a Rectangle that defines the bounds of this Polyline2D.

contains

public boolean contains(java.awt.Point p)

Determines whether the specified Point is inside this Polyline2D. This method is required to implement the Shape interface, but in the case of Line2D objects it always returns false since a line contains no area.

contains

public boolean contains(double x,
               double y)

Determines if the specified coordinates are inside this Polyline2D. This method is required to implement the Shape interface, but in the case of Line2D objects it always returns false since a line contains no area.

Specified by:

contains in interface java.awt.Shape

contains

public boolean contains(int x,
               int y)

Determines whether the specified coordinates are inside this Polyline2D. This method is required to implement the Shape interface, but in the case of Line2D objects it always returns false since a line contains no area.

contains

public boolean contains(java.awt.geom.Point2D p)

Tests if a specified Point2D is inside the boundary of this Polyline2D. This method is required to implement the Shape interface, but in the case of Line2D objects it always returns false since a line contains no area.

Specified by:

contains in interface java.awt.Shape

intersects

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

Tests if the interior of this Polygon intersects the interior of a specified set of rectangular coordinates.

Specified by:

intersects in interface java.awt.Shape

Parameters:

x - the x coordinate of the specified rectangular shape's top-left corner

y - the y coordinate of the specified rectangular shape's top-left corner

w - the width of the specified rectangular shape

h - the height of the specified rectangular shape

Returns:

true if the interior of this Polygon and the interior of the specified set of rectangular coordinates intersect each other; false otherwise.

intersects

public boolean intersects(java.awt.geom.Rectangle2D r)

Tests if the interior of this Polygon intersects the interior of a specified Rectangle2D.

Specified by:

intersects in interface java.awt.Shape

Parameters:

r - a specified Rectangle2D

Returns:

true if this Polygon and the interior of the specified Rectangle2D intersect each other; false otherwise.

contains

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

Tests if the interior of this Polyline2D entirely contains the specified set of rectangular coordinates. This method is required to implement the Shape interface, but in the case of Line2D objects it always returns false since a line contains no area.

Specified by:

contains in interface java.awt.Shape

contains

public boolean contains(java.awt.geom.Rectangle2D r)

Tests if the interior of this Polyline2D entirely contains the specified Rectangle2D. This method is required to implement the Shape interface, but in the case of Line2D objects it always returns false since a line contains no area.

Specified by:

contains in interface java.awt.Shape

getPolygon2D

public Polygon2D getPolygon2D()

getPathIterator

public 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. 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

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.

getPathIterator

public java.awt.geom.PathIterator getPathIterator(java.awt.geom.AffineTransform at,
                                         double flatness)

Returns an iterator object that iterates along the boundary of the Shape and provides access to the geometry of the outline of the Shape. Only SEG_MOVETO and SEG_LINETO, point types are returned by the iterator. Since polylines are already flat, the flatness parameter is ignored.

Specified by:

getPathIterator in interface java.awt.Shape

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

flatness - the maximum amount that the control points for a given curve can vary from colinear before a subdivided curve is replaced by a straight line connecting the endpoints. Since polygons are already flat the flatness parameter is ignored.

Returns:

a PathIterator object that provides access to the Shape object's geometry.