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java.awt
Class Polygon
java.lang.Object
java.awt.Polygon
-
All Implemented Interfaces:
-
Shape
,
Serializable
-
public class Polygon
- extends Object
- implements Shape, Serializable
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
(
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
(
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.
-
Since:
-
1.0
JDK1.0
-
See Also:
-
Shape
,
Serialized Form
Field Summary
|
protected
Rectangle
|
bounds
The bounds
Bounds
of
this Polygon.
the polygon.
|
int |
npoints
The total number of points. |
int[] |
xpoints
The array of
X
x
coordinates. |
int[] |
ypoints
The array of
Y
y
coordinates. |
Constructor Summary
|
Polygon
()
Creates an empty polygon. |
Polygon
(int[] xpoints, int[] ypoints, int npoints)
Constructs and initializes a Polygon from the specified parameters. |
Method Summary
|
void |
addPoint
(int x, int y)
Appends the specified coordinates to this Polygon. |
boolean |
contains
(double x, double y)
Tests
Determines
if the specified coordinates are inside
the boundary of the Shape.
this Polygon.
|
boolean |
contains
(double x, double y, double w, double h)
Tests if the interior of
the Shape
this Polygon
entirely contains the specified
set of
rectangular
area.
coordinates.
|
boolean |
contains
(int x, int y)
Determines whether the specified coordinates are inside this Polygon. |
boolean |
contains
(
Point
p)
Determines whether the specified
Point
is inside this Polygon. |
boolean |
contains
(
Point2D
Tests if a specified
Point2D
|
boolean |
contains
(
Rectangle2D
Tests if the interior of
the Shape
this Polygon
entirely contains the specified Rectangle2D. |
Rectangle
|
getBoundingBox
()
Deprecated.
As of JDK version 1.1, replaced by getBounds().
|
Rectangle
|
getBounds
()
Gets the bounding box of this Polygon. |
Rectangle2D
|
getBounds2D
()
Returns
a
the
high precision
and more accurate
bounding box of the
Shape than the getBounds method.
Shape
|
PathIterator
|
getPathIterator
(
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. |
PathIterator
|
getPathIterator
(
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. |
boolean |
inside
(int x, int y)
Deprecated.
As of JDK version 1.1, replaced by contains(int, int).
|
boolean |
intersects
(double x, double y, double w, double h)
Tests if the interior of
the Shape
this Polygon
intersects the interior of a specified
set of
rectangular
area.
coordinates.
|
boolean |
intersects
(
Rectangle2D
Tests if the interior of
the Shape
this Polygon
intersects the interior of a specified Rectangle2D. |
void |
invalidate
()
Invalidates or flushes any internally-cached data that depends on the vertex coordinates of this Polygon. |
void |
reset
()
Resets this Polygon object to an empty polygon. |
void |
translate
(int deltaX, int deltaY)
Translates the vertices of the 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
-
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.
-
Since:
-
1.0
-
See Also:
-
addPoint(int, int)
xpoints
public int[] xpoints
-
The array of
X
x
coordinates. The number of elements in this array might be more than the number of
X
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.
-
Since:
-
1.0
-
See Also:
-
addPoint(int, int)
ypoints
public int[] ypoints
-
The array of
Y
y
coordinates. The number of elements in this array might be more than the number of
Y
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.
-
Since:
-
1.0
-
See Also:
-
addPoint(int, int)
bounds
protected Rectangle bounds
-
The bounds of this Polygon. This value can be null.
Bounds of the polygon. This value can be NULL. Please see the javadoc comments getBounds().
-
Since:
-
1.0
-
See Also:
-
getBoundingBox()
,
getBounds()
Polygon
public Polygon()
-
Creates an empty polygon.
-
Since:
-
1.0
Polygon
public Polygon(int[] xpoints,
int[] ypoints,
int npoints)
-
Constructs and initializes a Polygon from the specified parameters.
-
Parameters:
-
xpoints - an array of
X
x
coordinates -
ypoints - an array of
Y
y
coordinates -
npoints - the total number of points in the Polygon
-
Throws:
-
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.
-
Since:
-
1.0
reset
public void reset()
-
Resets this 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.
-
-
-
Since:
-
1.4
-
See Also:
-
invalidate()
invalidate
public void invalidate()
-
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.
-
-
-
Since:
-
1.4
-
See Also:
-
getBounds()
translate
public void translate(int deltaX,
int deltaY)
-
Translates the vertices of the Polygon by deltaX along the x axis and by deltaY along the y axis.
-
-
-
Parameters:
-
deltaX - the amount to translate along the
X
x
axis -
deltaY - the amount to translate along the
Y
y
axis -
Since:
-
1.1
JDK1.1
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
x
coordinate -
y - the specified
Y
y
coordinate -
Since:
-
1.0
-
See Also:
-
getBounds()
,
contains(java.awt.Point)
getBounds
public Rectangle getBounds()
-
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
Shape
-
-
Returns:
-
a Rectangle that defines the bounds of this Polygon.
-
Since:
-
1.1
JDK1.1
-
See Also:
-
Shape.getBounds2D()
getBoundingBox
@Deprecated
public Rectangle getBoundingBox()
-
Deprecated.
As of JDK version 1.1, replaced by getBounds().
-
Returns the bounds of this Polygon.
-
-
-
Returns:
-
the bounds of this Polygon.
-
Since:
-
1.0
contains
public boolean contains(Point p)
-
Determines whether the specified
Point
is inside this Polygon.
-
-
-
Parameters:
-
p - the specified Point to be tested
-
Returns:
-
true if the Polygon contains the Point; false otherwise.
-
Since:
-
1.0
-
See Also:
-
contains(double, double)
contains
public boolean contains(int x,
int y)
-
Determines whether the specified coordinates are inside this Polygon.
-
-
-
Parameters:
-
x - the specified
X
x
coordinate to be tested -
y - the specified
Y
y
coordinate to be tested -
Returns:
-
true if this Polygon contains the specified
coordinates (x,y);
coordinates, (
x
,
y
);
false otherwise. -
Since:
-
1.1
JDK1.1
-
See Also:
-
contains(double, double)
inside
@Deprecated
public boolean inside(int x,
int y)
-
Deprecated.
As of JDK version 1.1, replaced by contains(int, int).
-
Determines whether the specified coordinates are contained in this Polygon.
-
-
-
Parameters:
-
x - the specified
X
x
coordinate to be tested -
y - the specified
Y
y
coordinate to be tested -
Returns:
-
true if this Polygon contains the specified
coordinates (x,y);
coordinates, (
x
,
y
);
false otherwise. -
Since:
-
1.0
-
See Also:
-
contains(double, double)
getBounds2D
public Rectangle2D getBounds2D()
-
Returns a high precision and more accurate bounding box of the Shape than the getBounds method. Note that there is no guarantee that the returned
Rectangle2D
Returns the high precision bounding box of the
Shape
is the smallest bounding box that encloses the Shape, only that the Shape lies entirely within the indicated Rectangle2D. The bounding box returned by this method is usually tighter than that returned by the getBounds method and never fails due to overflow problems since the return value can be an instance of the Rectangle2D that uses double precision values to store the dimensions.
.
-
-
Specified by:
-
getBounds2D
in interface
Shape
-
-
Returns:
-
an instance of Rectangle2D that is a high-precision bounding box of the Shape.
a
Rectangle2D
that precisely bounds the Shape.
-
Since:
-
1.2
-
See Also:
-
Shape.getBounds()
contains
public boolean contains(double x,
double y)
-
Tests if the specified coordinates are inside the boundary of the Shape.
Determines if the specified coordinates are inside this Polygon. For the definition of
insideness
, see the class comments of
Shape
.
-
-
Specified by:
-
contains
in interface
Shape
-
-
Parameters:
-
x - the specified
X
x
coordinate
to be tested
-
y - the specified
Y
y
coordinate
to be tested
-
Returns:
-
true if the specified coordinates are inside the Shape boundary; false otherwise.
-
Since:
-
1.2
true if the Polygon contains the specified coordinates; false otherwise.
contains
public boolean contains(Point2D p)
-
Tests if a specified
Point2D
is inside the boundary of
the Shape.
this Polygon.
-
-
Specified by:
-
contains
in interface
Shape
-
-
Parameters:
-
p -
the
a
specified Point2D
to be tested
-
Returns:
-
true if
this Polygon contains
the specified
Point2D is inside the boundary of the Shape;
Point2D;
false otherwise. -
Since:
See Also:
-
1.2
contains(double, double)
intersects
public boolean intersects(double x,
double y,
double w,
double h)
-
Tests if the interior of the Shape intersects the interior of a specified rectangular area. The rectangular area is considered to intersect the Shape if any point is contained in both the interior of the Shape and the specified rectangular area.
Tests if the interior of this Polygon intersects the interior of a specified set of rectangular coordinates.
The Shape.intersects() method allows a Shape implementation to conservatively return true when:
-
there is a high probability that the rectangular area and the Shape intersect, but
-
the calculations to accurately determine this intersection are prohibitively expensive.
This means that for some Shapes this method might return true even though the rectangular area does not intersect the Shape. The
Area
class performs more accurate computations of geometric intersection than most Shape objects and therefore can be used if a more precise answer is required.
-
-
Specified by:
-
intersects
in interface
Shape
-
-
Parameters:
-
x - the
X
x
coordinate of the
upper-left corner of the
specified rectangular
area
shape's top-left corner
-
y - the
Y
y
coordinate of the
upper-left corner of the
specified rectangular
area
shape's top-left corner
-
w - the width of the specified rectangular
area
shape
-
h - the height of the specified rectangular
area
shape
-
Returns:
-
true if the interior of the Shape and the interior of the rectangular area intersect, or are both highly likely to intersect and intersection calculations would be too expensive to perform; false otherwise.
true if the interior of this Polygon and the interior of the specified set of rectangular coordinates intersect each other; false otherwise
-
Since:
-
1.2
-
See Also:
-
Area
intersects
public boolean intersects(Rectangle2D r)
-
Tests if the interior of the Shape intersects the interior of a specified Rectangle2D. The Shape.intersects() method allows a Shape implementation to conservatively return true when:
-
there is a high probability that the Rectangle2D and the Shape intersect, but
-
the calculations to accurately determine this intersection are prohibitively expensive.
This means that for some Shapes this method might return true even though the Rectangle2D does not intersect the Shape. The
Area
class performs more accurate computations of geometric intersection than most Shape objects and therefore can be used if a more precise answer is required.
Tests if the interior of this Polygon intersects the interior of a specified Rectangle2D.
-
-
Specified by:
-
intersects
in interface
Shape
-
-
Parameters:
-
r -
the
a
specified Rectangle2D -
Returns:
-
true if the interior of the Shape and the interior of the specified Rectangle2D intersect, or are both highly likely to intersect and intersection calculations would be too expensive to perform; false otherwise.
true if this Polygon and the interior of the specified Rectangle2D intersect each other; false otherwise.
-
Since:
-
1.2
-
See Also:
-
Shape.intersects(double, double, double, double)
contains
public boolean contains(double x,
double y,
double w,
double h)
-
Tests if the interior of the Shape entirely contains the specified rectangular area. All coordinates that lie inside the rectangular area must lie within the Shape for the entire rectanglar area to be considered contained within the Shape.
Tests if the interior of this Polygon entirely contains the specified set of rectangular coordinates.
The Shape.contains() method allows a Shape implementation to conservatively return false when:
-
the intersect method returns true and
-
the calculations to determine whether or not the Shape entirely contains the rectangular area are prohibitively expensive.
This means that for some Shapes this method might return false even though the Shape contains the rectangular area. The
Area
class performs more accurate geometric computations than most Shape objects and therefore can be used if a more precise answer is required.
-
-
Specified by:
-
contains
in interface
Shape
-
-
Parameters:
-
x - the
X
x
coordinate of the
upper-left
top-left
corner of the specified
set of
rectangular
area
coordinates
-
y - the
Y
y
coordinate of the
upper-left
top-left
corner of the specified
set of
rectangular
area
coordinates
-
w - the width of the
specified
set of
rectangular
area
coordinates
-
h - the height of the
specified
set of
rectangular
area
coordinates
-
Returns:
-
true if the interior of the Shape entirely contains the specified rectangular area; false otherwise or, if the Shape contains the rectangular area and the intersects method returns true and the containment calculations would be too expensive to perform.
true if this Polygon entirely contains the specified set of rectangular coordinates; false otherwise
-
Since:
-
1.2
-
See Also:
-
Area
,
Shape.intersects(double, double, double, double)
contains
public boolean contains(Rectangle2D r)
-
Tests if the interior of the Shape entirely contains the specified Rectangle2D. The Shape.contains() method allows a Shape implementation to conservatively return false when:
-
the intersect method returns true and
-
the calculations to determine whether or not the Shape entirely contains the Rectangle2D are prohibitively expensive.
This means that for some Shapes this method might return false even though the Shape contains the Rectangle2D. The
Area
class performs more accurate geometric computations than most Shape objects and therefore can be used if a more precise answer is required.
Tests if the interior of this Polygon entirely contains the specified Rectangle2D.
-
-
Specified by:
-
contains
in interface
Shape
-
-
Parameters:
-
r -
The
the
specified Rectangle2D -
Returns:
-
true if the interior of the Shape entirely contains the Rectangle2D; false otherwise or, if the Shape contains the Rectangle2D and the intersects method returns true and the containment calculations would be too expensive to perform.
true if this Polygon entirely contains the specified Rectangle2D; false otherwise.
-
Since:
-
1.2
-
See Also:
-
Shape.contains(double, double, double, double)
contains(double, double, double, double)
getPathIterator
public PathIterator getPathIterator(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
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.
-
Since:
-
1.2
getPathIterator
public PathIterator getPathIterator(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, 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.
-
-
Specified by:
-
getPathIterator
in interface
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.
-
Since:
-
1.2