jdraw.graphicobjects
Class Ellipse

java.lang.Object
  |
  +--jdraw.graphicobjects.GraphicObject
        |
        +--jdraw.graphicobjects.SizedGraphicObject
              |
              +--jdraw.graphicobjects.Ellipse

public class Ellipse

extends SizedGraphicObject

An ellipse.

Field Summary

private Point	center The center of this ellipse.
private static Cursor	CURSOR The mouse cursor for this object.
static String	FRIENDLY_NAME The friendly name of objects of this class.
private int	x_radius The X-axis radius of this ellipse.
private int	y_radius The Y-axis radius of this ellipse.

Fields inherited from class jdraw.graphicobjects.SizedGraphicObject

Fields inherited from class jdraw.graphicobjects.GraphicObject

Constructor Summary

Ellipse(int x, int y, Color color, int width, int height)
Creates a new Ellipse with specified position, color, width and height.

Method Summary

Point	getCenter() Returns the center of this ellipse.
Cursor	getCursor() Returns the mouse cursor for this object.
int	getDistanceSq(Point point) Returns the square of the minimal distance between this ellipse and the specified point.
String	getFriendlyName() Returns the friendly name of this ellipse.
int	getXRadius() Returns the X-axis radius of this ellipse.
int	getYRadius() Returns the Y-axis radius of this ellipse.
void	paint(Graphics g) Paints this ellipse.
void	updateCachedData() Invoked when cached data have to be updated.
protected void	updateCenter() Updates the center of this ellipse.
protected void	updateRadii() Updates the radii of this ellipse.

Methods inherited from class jdraw.graphicobjects.SizedGraphicObject

getBoundingBox, getHeight, getWidth

Methods inherited from class jdraw.graphicobjects.GraphicObject

getColor, getDistance, getDistanceSq, getDistanceSq, getX, getY

Methods inherited from class java.lang.Object

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

Field Detail

FRIENDLY_NAME

public static final String FRIENDLY_NAME

The friendly name of objects of this class.

See Also:

Constant Field Values

CURSOR

private static final Cursor CURSOR

The mouse cursor for this object.

center

private final Point center

The center of this ellipse.

x_radius

private int x_radius

The X-axis radius of this ellipse.

y_radius

private int y_radius

The Y-axis radius of this ellipse.

Constructor Detail

Ellipse

public Ellipse(int x,
               int y,
               Color color,
               int width,
               int height)

Creates a new Ellipse with specified position, color, width and height.

Method Detail

getCursor

public Cursor getCursor()

Returns the mouse cursor for this object.

Specified by:

getCursor in class GraphicObject

getFriendlyName

public String getFriendlyName()

Returns the friendly name of this ellipse.

Specified by:

getFriendlyName in class GraphicObject

paint

public void paint(Graphics g)

Paints this ellipse.

Specified by:

paint in class GraphicObject

getDistanceSq

public int getDistanceSq(Point point)

Returns the square of the minimal distance between this ellipse and the specified point. Actually, this methods does not return the minimal distance (which is not easily computable), but the distance between the specified point and the intersection between this point and the center of this ellipse. This was found to be a sufficient approximation.

Specified by:

getDistanceSq in class GraphicObject

updateCachedData

public void updateCachedData()

Invoked when cached data have to be updated.

Overrides:

updateCachedData in class GraphicObject

getCenter

public Point getCenter()

Returns the center of this ellipse.

updateCenter

protected void updateCenter()

Updates the center of this ellipse.

getXRadius

public int getXRadius()

Returns the X-axis radius of this ellipse.

getYRadius

public int getYRadius()

Returns the Y-axis radius of this ellipse.

updateRadii

protected void updateRadii()

Updates the radii of this ellipse.