public class Polygon extends Object implements Shape, Serializable
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| Modifier and Type | Field | Description |
|---|---|---|
protected Rectangle |
bounds |
The bounds of this
Polygon. |
int |
npoints |
The total number of points.
|
int[] |
xpoints |
The array of X coordinates.
|
int[] |
ypoints |
The array of Y coordinates.
|
| Constructor | Description |
|---|---|
Polygon() |
Creates an empty polygon.
|
Polygon(int[] xpoints,
int[] ypoints,
int npoints) |
Constructs and initializes a
Polygon from the specified
parameters. |
| Modifier and Type | Method | Description |
|---|---|---|
void |
addPoint(int x,
int y) |
Appends the specified coordinates to this
Polygon. |
boolean |
contains(double x,
double y) |
Tests if the specified coordinates are inside the boundary of the
Shape, as described by the
definition of insideness. |
boolean |
contains(double x,
double y,
double w,
double h) |
Tests if the interior of the
Shape entirely contains
the specified rectangular area. |
boolean |
contains(int x,
int y) |
Determines whether the specified coordinates are inside this
Polygon. |
boolean |
|