y.geom
Class YCircle

java.lang.Object
  |
  +--y.geom.YCircle

All Implemented Interfaces:

Comparable

public class YCircle

extends Object

implements Comparable

This class represents a circle in the plane. A circle is defined by its center point and its radius.

Field Summary

YPoint	center the center of the circle
double	radius the radius of the circle

Constructor Summary

YCircle(double radius)
Instantiates a circle with center location (0,0) and given radius.

YCircle(YPoint center, double radius)
Returns a circle defined by its center and the radius.

YCircle(YPoint prevPoint, YPoint succPoint, double radius)
Instantiates a circle defined by two points on its boundary and the radius.

YCircle(YPoint p, YPoint q, YPoint r)
Instantiates a circle defined by three points on its boundary.

Method Summary

int	compareTo(Object o)
boolean	equals(Object o)
YPoint	getCenter() Returns the center of the circle.
YPoint[]	getCut(AffineLine line) Determines the intersection between this circle and a line.
double	getRadius() Returns the radius of the circle.
YPoint[]	getRectCut(YPoint corner, YDimension size) Returns the intersection points of the circle with a rectangle.
YPoint[]	getXCut(double y) Determine the intersection between the circle and a parallel to the X-Axis.
YPoint[]	getYCut(double x) Determine the intersection between the circle and a parallel to the Y-Axis.
int	hashCode()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Field Detail

center

public final YPoint center

the center of the circle

radius

public final double radius

the radius of the circle

Constructor Detail

YCircle

public YCircle(double radius)

Instantiates a circle with center location (0,0) and given radius.

YCircle

public YCircle(YPoint prevPoint,
               YPoint succPoint,
               double radius)

Instantiates a circle defined by two points on its boundary and the radius.

YCircle

public YCircle(YPoint p,
               YPoint q,
               YPoint r)

Instantiates a circle defined by three points on its boundary.

Throws:

IllegalArgumentException - if the points are colinear

YCircle

public YCircle(YPoint center,
               double radius)

Returns a circle defined by its center and the radius.

Method Detail

getCenter

public YPoint getCenter()

Returns the center of the circle.

getRadius

public final double getRadius()

Returns the radius of the circle.

getXCut

public YPoint[] getXCut(double y)

Determine the intersection between the circle and a parallel to the X-Axis.

Parameters:

y - y coordinate of the parallel.

getYCut

public YPoint[] getYCut(double x)

Determine the intersection between the circle and a parallel to the Y-Axis.

Parameters:

x - x coordinate of the parallel.

getCut

public YPoint[] getCut(AffineLine line)

Determines the intersection between this circle and a line.

getRectCut

public YPoint[] getRectCut(YPoint corner,
                           YDimension size)

Returns the intersection points of the circle with a rectangle. If there are two intersection points, the result is ordered. Then the first point in the result is the intersection point encountered when going from the center in ccw wise order around the circle.

Parameters:

corner - the upper left corner of the rectangle

size - the size of the rectangle

Returns:

the points intersecting the rectangle or null if there are no intersection points.

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

compareTo

public int compareTo(Object o)

Specified by:

compareTo in interface Comparable