org.opensourcephysics.display
Class Arrow

java.lang.Object
  org.opensourcephysics.display.Arrow

All Implemented Interfaces:

Drawable

public class Arrow
extends java.lang.Object
implements Drawable

A Drawable arrow that uses Java 2D drawing.

Version:

1.0

Author:

Wolfgang Christian

Field Summary

protected double	a
protected double	b
protected java.awt.Color	color
protected float	headSize
protected double	x
protected double	y

Constructor Summary

Arrow(double _x, double _y, double _a, double _b)
Constructs an Arrow with the given postion and components.

Method Summary

void	draw(DrawingPanel panel, java.awt.Graphics g) Draws the arrow.
protected java.awt.Shape	getHead(double theta) Gets the arrowhead shape.
float	getHeadSize() Gets the headsize for the arrow.
static XML.ObjectLoader	getLoader() Gets a loader that allows a Circle to be represented as XML data.
double	getX() Gets the x coordinate.
double	getXlength() Gets the horizontal component.
double	getY() Gets the y coordinate.
double	getYlength() Gets the vertical component.
void	setColor(java.awt.Color c) Sets the arrow's color.
void	setHeadSize(float size) Sets the headsize for the arrow.
void	setX(double x) Sets the x coordinate.
void	setXlength(double dx) Sets the arrow's horizontal component.
void	setXY(double x, double y) Sets the x and y coordinates.
void	setY(double y) Sets the y coordinate.
void	setYlength(double dy) Sets the arrows vertical component.

Methods inherited from class java.lang.Object

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

Field Detail

headSize

protected float headSize

color

protected java.awt.Color color

x

protected double x

y

protected double y

a

protected double a

b

protected double b

Constructor Detail

Arrow

public Arrow(double _x,
             double _y,
             double _a,
             double _b)

Constructs an Arrow with the given postion and components.

Parameters:

_x - postion

_y - position

_a - horizontal component

_b - vertical component

Method Detail

getX

public double getX()

Gets the x coordinate.

Returns:

double x

setX

public void setX(double x)

Sets the x coordinate.

Parameters:

x -

getY

public double getY()

Gets the y coordinate.

Returns:

double y

setY

public void setY(double y)

Sets the y coordinate.

Parameters:

y -

setXY

public void setXY(double x,
                  double y)

Sets the x and y coordinates.

Parameters:

y -

setColor

public void setColor(java.awt.Color c)

Sets the arrow's color.

Parameters:

c -

setXlength

public void setXlength(double dx)

Sets the arrow's horizontal component.

Parameters:

dx -

setYlength

public void setYlength(double dy)

Sets the arrows vertical component.

Parameters:

dy -

getXlength

public double getXlength()

Gets the horizontal component.

Returns:

horizontal

getYlength

public double getYlength()

Gets the vertical component.

Returns:

vertical

getHeadSize

public float getHeadSize()

Gets the headsize for the arrow.

Returns:

float

setHeadSize

public void setHeadSize(float size)

Sets the headsize for the arrow.

Parameters:

size - float the head size in pixels.

draw

public void draw(DrawingPanel panel,
                 java.awt.Graphics g)

Draws the arrow.

Specified by:

draw in interface Drawable

Parameters:

panel - the drawing panel in which the arrow is viewed

g - the graphics context upon which to draw

getHead

protected java.awt.Shape getHead(double theta)

Gets the arrowhead shape.

Parameters:

theta - double the angle of the arrow

Returns:

Shape

getLoader

public static XML.ObjectLoader getLoader()

Gets a loader that allows a Circle to be represented as XML data. Objects without XML loaders cannot be saved and retrieved from an XML file.

Returns:

ObjectLoader