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y.geom
Class YCircle

java.lang.Object
  extended by y.geom.YCircle
All Implemented Interfaces:
java.lang.Comparable

public class YCircle
extends java.lang.Object
implements java.lang.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(java.lang.Object o)
           
 boolean equals(java.lang.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:
java.lang.IllegalArgumentException - if the points are collinear

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 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(java.lang.Object o)
Overrides:
equals in class java.lang.Object

hashCode

public int hashCode()
Overrides:
hashCode in class java.lang.Object

compareTo

public int compareTo(java.lang.Object o)
Specified by:
compareTo in interface java.lang.Comparable

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