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java.lang.Objectimagescience.shape.Polygon
public class Polygon
A polygon in the x-y plane. Although higher-dimensional vertices are accepted, only the x- and y-coordinates of the vertices are actually considered by all methods.
Constructor Summary | |
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Polygon()
Default constructor. |
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Polygon(Polygon polygon)
Copy constructor. |
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Polygon(java.util.Vector<Point> vertices)
Constructs a polygon from the given vertices. |
Method Summary | |
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double |
area()
Returns the area spanned by the polygon. |
Image |
bitmap(boolean binary)
Computes a bitmapped version of the shape. |
Bounds |
bounds()
Computes the bounding box of the shape. |
boolean |
contains(double x,
double y)
Indicates the position of a point relative to the polygon. |
boolean |
contains(Point point)
Indicates the position of a point relative to the polygon. |
java.awt.geom.GeneralPath |
contour()
Returns the contour of the polygon. |
Shape |
duplicate()
Duplicates the shape. |
boolean |
empty()
Indicates whether the shape is empty. |
boolean |
equals(Shape shape)
Indicates whether this object has the same shape as the given object. |
double |
perimeter()
Returns the perimeter of the polygon. |
void |
set(java.util.Vector<Point> vertices)
Sets the vertices of the polygon to the given vertices. |
void |
translate(double dx,
double dy)
Translates the polygon over the given distance. |
java.util.Vector<Point> |
vertices()
Returns a new Vector object containing the handles of the vertices of the polygon. |
void |
vertices(java.util.Vector<Point> vertices)
Sets the vertices of the polygon to the given vertices. |
Methods inherited from class java.lang.Object |
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equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public Polygon()
public Polygon(java.util.Vector<Point> vertices)
vertices
- The vertices that define the polygon. The handles of the Point
objects are copied.
java.lang.NullPointerException
- If vertices
or any of its elements is null
.public Polygon(Polygon polygon)
polygon
- The polygon to be copied. All information is copied and no memory is shared with this polygon.
java.lang.NullPointerException
- If polygon
is null
.Method Detail |
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public void set(java.util.Vector<Point> vertices)
vertices
- The vertices to be copied. The handles of the Point
objects are copied.
java.lang.NullPointerException
- If vertices
or any of its elements is null
.public void vertices(java.util.Vector<Point> vertices)
set(Vector)
.
vertices
- The vertices to be copied. The handles of the Point
objects are copied.
java.lang.NullPointerException
- If vertices
or any of its elements is null
.public java.util.Vector<Point> vertices()
Vector
object containing the handles of the vertices of the polygon.
Vector
object containing the handles of the vertices of the polygon.public Shape duplicate()
Shape
duplicate
in interface Shape
Shape
object that is an exact copy of this object. All information is copied and no memory is shared between this and the returned object.public void translate(double dx, double dy)
dx
- The distance in the x-dimension over which to translate.dy
- The distance in the y-dimension over which to translate.public double perimeter()
public double area()
public boolean contains(Point point)
contains
in interface Shape
point
- The point whose position relative to the polygon is to be tested. The point is treated as a 2D point. That is, only its x- and y-coordinate values are considered.
contains(point.x,point.y)
.
java.lang.NullPointerException
- If point
is null
.public boolean contains(double x, double y)
x
- The x-coordinate of the point.y
- The y-coordinate of the point.
true
if the point is on or inside the polygon, or false
if it is outside the polygon.public java.awt.geom.GeneralPath contour()
GeneralPath
object containing the contour of the polygon. The interior of the returned path is defined by the non-zero winding rule.public Image bitmap(boolean binary)
Shape
bitmap
in interface Shape
binary
- Determines whether the returned bitmap image is two-valued. If true
, image elements whose center positions fall inside the shape are set to 255
, and elements whose center positions fall outside the shape are set to 0
. If false
, additional processing is performed, by which each image element falling partly inside and partly outside the shape is set to 255
times its (approximate) inside-fraction.
ByteImage
object containing a bitmapped version of the shape. The origin of the integer coordinate system of the image corresponds to the position in the shape coordinate system obtained by taking the floor value of the lower bound of the shape in each dimension.public Bounds bounds()
Shape
bounds
in interface Shape
Bounds
object containing the bounding box of the shape.public boolean equals(Shape shape)
Shape
equals
in interface Shape
shape
- The shape to compare this shape with.
true
if shape
is not null
, and an instance of the same class as this object, with the exact same shape, or false
if this is not the case.public boolean empty()
Shape
empty
in interface Shape
true
if the shape does not enclose any space, or false
if it does.
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