java.lang.Object java.awt.Polygon
public class Polygon
The Polygon class encapsulates a description of a closed, two-dimensional region within a coordinate space. This region is bounded by an arbitrary number of line segments, each of which is one side of the polygon. Internally, a polygon comprises of a list of (x, y) coordinate pairs, where each pair defines a vertex of the polygon, and two successive pairs are the endpoints of a line that is a side of the polygon. The first and final pairs of (x, y) points are joined by a line segment that closes the polygon. This Polygon is defined with an even-odd winding rule. See WIND_EVEN_ODD for a definition of the even-odd winding rule. This class's hit-testing methods, which include the contains, intersects and inside methods, use the insideness definition described in the Shape class comments.
Shape, Serialized Form
protected Rectangle bounds
int npoints
int[] xpoints
int[] ypoints
Polygon()
Polygon(int[] xpoints, int[] ypoints, int npoints)
Polygon from the specified parameters. Method Summary void addPoint(int x, int y)
Polygon. boolean contains(double x, double y)
Polygon. boolean contains(double x, double y, double w, double h)
Polygon entirely contains the specified set of rectangular coordinates. boolean contains(int x, int y)
Polygon. boolean contains(Point p)
Point is inside this Polygon. boolean contains(Point2D p)
Point2D is inside the boundary of this Polygon. boolean contains(Rectangle2D r)
Polygon entirely contains the specified Rectangle2D. Rectangle getBoundingBox()
getBounds(). Rectangle getBounds()
Polygon. Rectangle2D getBounds2D()
Shape. PathIterator getPathIterator(AffineTransform at)
Polygon and provides access to the geometry of the outline of this Polygon. PathIterator getPathIterator(AffineTransform at, double flatness)
Shape and provides access to the geometry of the outline of the Shape. boolean inside(int x, int y)
contains(int, int). boolean intersects(double x, double y, double w, double h)
Polygon intersects the interior of a specified set of rectangular coordinates. boolean intersects(Rectangle2D r)
Polygon intersects the interior of a specified Rectangle2D. void invalidate()
Polygon. void reset()
Polygon object to an empty polygon. void translate(int deltaX, int deltaY)
Polygon by deltaX along the x axis and by deltaY along the y axis. Methods inherited from class java.lang.Object clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait npoints
public int npoints
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.
addPoint(int, int)
public int[] xpoints
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.
addPoint(int, int)
public int[] ypoints
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.
addPoint(int, int)
protected Rectangle bounds
getBoundingBox(), getBounds()
public Polygon()
public Polygon(int[] xpoints,
int[] ypoints,
int npoints)
Polygon from the specified parameters.
xpoints - an array of x coordinates
ypoints - an array of y coordinates
npoints - the total number of points in the Polygon
NegativeArraySizeException - if the value of npoints is negative.
IndexOutOfBoundsException - if npoints is greater than the length of xpoints or the length of ypoints.
NullPointerException - if xpoints or ypoints is null.
public void reset()
Polygon 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 Polygon might be more memory efficient than resetting the current one if the number of vertices in the new polygon data is significantly smaller than the number of vertices in the data from before the reset.
invalidate()
public void invalidate()
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.
getBounds()
public void translate(int deltaX,
int deltaY)
Polygon by deltaX along the x axis and by deltaY along the y axis.
deltaX - the amount to translate along the x axis
deltaY - the amount to translate along the y axis
public void addPoint(int x,
int y)
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.
x - the specified x coordinate
y - the specified y coordinate
getBounds(), contains(java.awt.Point)
public Rectangle getBounds()
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.
getBounds in interface Shape
Rectangle that defines the bounds of this Polygon.
Shape.getBounds2D()
@Deprecated public Rectangle getBoundingBox()
getBounds().
Polygon.
Polygon.
public boolean contains(Point p)
Point is inside this Polygon.
p - the specified Point to be tested
true if the Polygon contains the Point; false otherwise.
contains(double, double)
public boolean contains(int x,
int y)
Polygon.
x - the specified x coordinate to be tested
y - the specified y coordinate to be tested
true if this Polygon contains the specified coordinates, (x, y); false otherwise.
contains(double, double)
@Deprecated
public boolean inside(int x,
int y)
contains(int, int).
Polygon.
x - the specified x coordinate to be tested
y - the specified y coordinate to be tested
true if this Polygon contains the specified coordinates, (x, y); false otherwise.
contains(double, double)
public Rectangle2D getBounds2D()
Shape.
getBounds2D in interface Shape
Rectangle2D that precisely bounds the Shape.
Shape.getBounds()
public boolean contains(double x,
double y)
Polygon. For the definition of insideness, see the class comments of Shape.
contains in interface Shape
x - the specified x coordinate
y - the specified y coordinate
true if the Polygon contains the specified coordinates; false otherwise.
public boolean contains(Point2D p)
Point2D is inside the boundary of this Polygon.
contains in interface Shape
p - a specified Point2D
true if this Polygon contains the specified Point2D; false otherwise.
contains(double, double)
public boolean intersects(double x,
double y,
double w,
double h)
Polygon intersects the interior of a specified set of rectangular coordinates.
intersects in interface Shape
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
true if the interior of this Polygon and the interior of the specified set of rectangular coordinates intersect each other; false otherwise
Area
public boolean intersects(Rectangle2D r)
Polygon intersects the interior of a specified Rectangle2D.
intersects in interface Shape
r - a specified Rectangle2D
true if this Polygon and the interior of the specified Rectangle2D intersect each other; false otherwise.
Shape.intersects(double, double, double, double)
public boolean contains(double x,
double y,
double w,
double h)
Polygon entirely contains the specified set of rectangular coordinates.
contains in interface Shape
x - the x coordinate of the top-left corner of the specified set of rectangular coordinates
y - the y coordinate of the top-left corner of the specified set of rectangular coordinates
w - the width of the set of rectangular coordinates
h - the height of the set of rectangular coordinates
true if this Polygon entirely contains the specified set of rectangular coordinates; false otherwise
Area, Shape.intersects(double, double, double, double)
public boolean contains(Rectangle2D r)
Polygon entirely contains the specified Rectangle2D.
contains in interface Shape
r - the specified Rectangle2D
true if this Polygon entirely contains the specified Rectangle2D; false otherwise.
contains(double, double, double, double)
public PathIterator getPathIterator(AffineTransform at)
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.
getPathIterator in interface Shape
at - an optional AffineTransform to be applied to the coordinates as they are returned in the iteration, or null if untransformed coordinates are desired
PathIterator object that provides access to the geometry of this Polygon.
public PathIterator getPathIterator(AffineTransform at,
double flatness)
Shape and provides access to the geometry of the outline of the Shape. Only SEG_MOVETO, SEG_LINETO, and SEG_CLOSE point types are returned by the iterator. Since polygons are already flat, the flatness parameter is ignored. An optional AffineTransform can be specified in which case the coordinates returned in the iteration are transformed accordingly.
getPathIterator in interface Shape
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.
PathIterator object that provides access to the Shape object's geometry.
Copyright © 2004, 2010 Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.
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