ur_rna.Utilities.geom

Class Ellipses.Circle

java.lang.Object

java.awt.geom.RectangularShape

java.awt.geom.Ellipse2D

java.awt.geom.Ellipse2D.Float

ur_rna.Utilities.geom.Ellipses.Circle

All Implemented Interfaces:

java.awt.Shape, java.io.Serializable, java.lang.Cloneable

Enclosing class:

Ellipses

public static class Ellipses.Circle
extends java.awt.geom.Ellipse2D.Float

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.awt.geom.Ellipse2D

java.awt.geom.Ellipse2D.Double, java.awt.geom.Ellipse2D.Float

Field Summary

Fields

Modifier and Type	Field and Description
private java.awt.geom.Point2D.Float	_center
private float	_radius

Fields inherited from class java.awt.geom.Ellipse2D.Float

height, width, x, y

Constructor Summary

Constructors

Constructor and Description
Circle(double radius)
Circle(double centerX, double centerY, double radius)
Circle(java.awt.geom.Point2D center, double radius)

Method Summary

Modifier and Type	Method and Description
java.awt.geom.Arc2D	arc(double startAngle, double arcAngle)
static Ellipses.Circle	calcFromPoints(java.awt.geom.Point2D p1, java.awt.geom.Point2D p2, java.awt.geom.Point2D p3) Calculate the center and radius of a circle from from 3 points on the circle.
static Ellipses.Circle	calcLeastSquaresFit(java.awt.geom.Point2D... points)
java.awt.geom.Point2D.Float	center()
void	center(double x, double y)
void	center(java.awt.geom.Point2D center)
double	getCircleX(double angle) get the x-coordinate of the circle at the specified angle.
double	getCircleY(double angle) get the y-coordinate of the circle at the specified angle.
java.awt.geom.Point2D	getPoint(double angle)
void	getPoint(double angle, java.awt.geom.Point2D result)
static double	getRadiusFromArcAndChord(double arcLength, double chordLength) This calculates the circumference of a circle based on an arc that is cut by a chord.
float	radius()
void	radius(double radius)
void	setCircle(java.awt.geom.Point2D center, float radius)
void	translate(float dx, float dy)

Methods inherited from class java.awt.geom.Ellipse2D.Float

getBounds2D, getHeight, getWidth, getX, getY, isEmpty, setFrame, setFrame

Methods inherited from class java.awt.geom.Ellipse2D

contains, contains, equals, getPathIterator, hashCode, intersects

Methods inherited from class java.awt.geom.RectangularShape

clone, contains, contains, getBounds, getCenterX, getCenterY, getFrame, getMaxX, getMaxY, getMinX, getMinY, getPathIterator, intersects, setFrame, setFrame, setFrameFromCenter, setFrameFromCenter, setFrameFromDiagonal, setFrameFromDiagonal

Methods inherited from class java.lang.Object

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

Field Detail

_center

private java.awt.geom.Point2D.Float _center

_radius

private float _radius

Constructor Detail

Circle

public Circle(double radius)

Circle

public Circle(double centerX,
              double centerY,
              double radius)

Circle

public Circle(java.awt.geom.Point2D center,
              double radius)

Method Detail

arc

public java.awt.geom.Arc2D arc(double startAngle,
                               double arcAngle)

calcFromPoints

public static Ellipses.Circle calcFromPoints(java.awt.geom.Point2D p1,
                                             java.awt.geom.Point2D p2,
                                             java.awt.geom.Point2D p3)

Calculate the center and radius of a circle from from 3 points on the circle.

Parameters:

p1 - A point on the circle

p2 - A point on the circle

p3 - A point on the circle

Returns:

A Circle that contains the three given points or NULL if the circle cannot be calculated (e.g. because two or more points are identical or because all three points are co-linear).

calcLeastSquaresFit

public static Ellipses.Circle calcLeastSquaresFit(java.awt.geom.Point2D... points)

center

public java.awt.geom.Point2D.Float center()

center

public void center(double x,
                   double y)

center

public void center(java.awt.geom.Point2D center)

getCircleX

public double getCircleX(double angle)

get the x-coordinate of the circle at the specified angle.

getCircleY

public double getCircleY(double angle)

get the y-coordinate of the circle at the specified angle.

getPoint

public java.awt.geom.Point2D getPoint(double angle)

getPoint

public void getPoint(double angle,
                     java.awt.geom.Point2D result)

getRadiusFromArcAndChord

public static double getRadiusFromArcAndChord(double arcLength,
                                              double chordLength)

This calculates the circumference of a circle based on an arc that is cut by a chord. The arc-length and the chord length are known, but the full circumference is not (and neither is the sweep angle or the radius). There is no analytical solution to the problem of how to determine the full circumference of a circle from a partial arclength and the chord length, so just estimate it roughly here.

radius

public float radius()

radius

public void radius(double radius)

setCircle

public void setCircle(java.awt.geom.Point2D center,
                      float radius)

translate

public void translate(float dx,
                      float dy)