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java.lang.Objectimagescience.shape.Circle
public class Circle
A circle in the x-y plane.
Constructor Summary | |
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Circle()
Default constructor. |
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Circle(Circle circle)
Copy constructor. |
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Circle(double x,
double y,
double radius)
Constructs a circle with given center position and radius. |
Method Summary | |
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double |
area()
Returns the area spanned by the circle. |
Image |
bitmap(boolean binary)
Computes a bitmapped version of the shape. |
Bounds |
bounds()
Computes the bounding box of the shape. |
void |
center(double x,
double y)
Sets the center position of the circle. |
boolean |
contains(double x,
double y)
Indicates the position of a point relative to the circle. |
boolean |
contains(Point point)
Indicates the position of a point relative to the circle. |
java.awt.geom.GeneralPath |
contour()
Returns the contour of the circle. |
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 circle. |
void |
position(double x,
double y)
Sets the center position of the circle. |
double |
radius()
Returns the radius of the circle. |
void |
radius(double radius)
Sets the radius of the circle. |
void |
set(double x,
double y,
double radius)
Sets the center position and radius of the circle. |
void |
translate(double dx,
double dy)
Translates the circle over the given distance. |
double |
x()
Returns the x-coordinate of the center position of the circle. |
void |
x(double x)
Sets the x-coordinate of the center position of the circle. |
double |
y()
Returns the y-coordinate of the center position of the circle. |
void |
y(double y)
Sets the y-coordinate of the center position of the circle. |
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 Circle()
public Circle(double x, double y, double radius)
x
- The x-coordinate of the center position of the circle.y
- The y-coordinate of the center position of the circle.radius
- The radius of the circle.
java.lang.IllegalArgumentException
- If radius
is less than 0
.public Circle(Circle circle)
circle
- The circle to be copied. All information is copied and no memory is shared with this circle.
java.lang.NullPointerException
- If circle
is null
.Method Detail |
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public void x(double x)
x
- The x-coordinate of the center position of the circle.public void y(double y)
y
- The y-coordinate of the center position of the circle.public void center(double x, double y)
position(double,double)
.
x
- The x-coordinate of the center position of the circle.y
- The y-coordinate of the center position of the circle.public void position(double x, double y)
center(double,double)
.
x
- The x-coordinate of the center position of the circle.y
- The y-coordinate of the center position of the circle.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 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 set(double x, double y, double radius)
x
- The x-coordinate of the center position of the circle.y
- The y-coordinate of the center position of the circle.radius
- The radius of the circle.
java.lang.IllegalArgumentException
- If radius
is less than 0
.public void radius(double radius)
radius
- The radius of the circle.
java.lang.IllegalArgumentException
- If radius
is less than 0
.public double x()
public double y()
public double radius()
public double perimeter()
public double area()
public boolean contains(Point point)
contains
in interface Shape
point
- The point whose position relative to the circle 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 circle, or false
if it is outside the circle.public java.awt.geom.GeneralPath contour()
GeneralPath
object containing the contour of the circle.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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Copyright (C) Erik Meijering. Permission to use this software and corresponding documentation for educational, research, and not-for-profit purposes, without a fee and without a signed licensing agreement, is granted, subject to the following terms and conditions.
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