java.lang.Object | +--java.awt.Polygon
Safe: 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 FormPolygon()
Polygon(int[] xpoints,
int[] ypoints,
int npoints)
Polygon from the specified
parameters.
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(java.awt.geom.Point2D p)
Point2D is inside the boundary of this
Polygon.
boolean
contains(java.awt.geom.Rectangle2D r)
Polygon entirely
contains the specified Rectangle2D.
java.awt.geom.Rectangle2D
getBounds2D()
Shape.
java.awt.geom.PathIterator
getPathIterator(java.awt.geom.AffineTransform at)
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)
Shape and provides access to the geometry of the
outline of the Shape.
boolean
intersects(double x,
double y,
double w,
double h)
Polygon intersects the
interior of a specified set of rectangular coordinates.
boolean
intersects(java.awt.geom.Rectangle2D r)
Polygon intersects the
interior of a specified Rectangle2D.
void
invalidate()
Polygon.
void
translate(int deltaX,
int deltaY)
Polygon by
deltaX along the x axis and by
deltaY along the y axis.
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()private static final long serialVersionUID
public Polygon()
public Polygon(int[] xpoints, int[] ypoints, int npoints)
Polygon from the specified
parameters.
xpoints - an array of x coordinatesypoints - an array of y coordinatesnpoints - the total number of points in the
Polygonpublic 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.
java.awt.Polygon#invalidatepublic 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.
java.awt.Polygon#getBoundspublic 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 axisdeltaY - the amount to translate along the y axisvoid calculateBounds(int[] xpoints, int[] ypoints, int npoints)
void updateBounds(int x, int y)
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.
java.awt.Polygon#getBounds,
java.awt.Polygon#containspublic 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.
Rectangle that defines the bounds of this
Polygon.Shape.getBounds2D()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.
true if this Polygon contains
the specified coordinates, (x, y);
false otherwise.contains(double, double)public boolean inside(int x, int y)
contains(int, int).
Polygon.
true if this Polygon contains
the specified coordinates, (x, y);
false otherwise.contains(double, double)public java.awt.geom.Rectangle2D getBounds2D()
Shape.
getBounds2D in interface ShapeRectangle2D 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.
true if the Polygon contains the
specified coordinates; false otherwise.private sun.awt.geom.Crossings getCrossings(double xlo, double ylo, double xhi, double yhi)
public boolean contains(java.awt.geom.Point2D p)
Point2D is inside the boundary of this
Polygon.
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 Shapew - the width of the specified rectangular shapeh - 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.java.awt.geom.Areapublic boolean intersects(java.awt.geom.Rectangle2D r)
Polygon intersects the
interior of a specified Rectangle2D.
intersects in interface Shaper - 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.
w - the width of the set of rectangular coordinatesh - the height of the set of rectangular coordinates
true if this Polygon entirely
contains the specified set of rectangular
coordinates; false otherwise.java.awt.geom.Area,
Shape.intersects(double, double, double, double)public boolean contains(java.awt.geom.Rectangle2D r)
Polygon entirely
contains the specified Rectangle2D.
r - the specified Rectangle2D
true if this Polygon entirely
contains the specified Rectangle2D;
false otherwise.contains(double, double, double, double)public java.awt.geom.PathIterator getPathIterator(java.awt.geom.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 Shapeat - an optional AffineTransform to be applied to the
coordinates as they are returned in the iteration, or
null if untransformed coordinates are desired
PolygonPathIterator object that provides access to the
geometry of this Polygon.public java.awt.geom.PathIterator getPathIterator(java.awt.geom.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 Shapeat - an optional AffineTransform to be applied to the
coordinates as they are returned in the iteration, or
null if untransformed coordinates are desiredflatness - 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.