uk.ac.starlink.xdoc.fig

Class Arrow

java.lang.Object

uk.ac.starlink.xdoc.fig.Arrow

Direct Known Subclasses:

Arrow.FilledArrow

public abstract class Arrow
extends Object

Draws arrows.

Since:

18 Sep 2007

Author:

Mark Taylor

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Arrow.FilledArrow Arrow instance with a filled triangular head.

Constructor Summary

Constructors

Constructor and Description
Arrow()

Method Summary

Modifier and Type	Method and Description
static Arrow	createFilledArrow(int lpar, int lperp) Returns an arrow instance with a filled head.
protected abstract void	drawArrow(Graphics2D g2, int x1) Does the shape-specific work of drawing the arrow.
void	drawArrow(Graphics2D g2, int x1, int y1, int x2, int y2) Draws an arrow.
void	setPad(int pad) Sets padding.

Methods inherited from class java.lang.Object

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

Constructor Detail

Arrow

public Arrow()

Method Detail

drawArrow

public void drawArrow(Graphics2D g2,
                      int x1,
                      int y1,
                      int x2,
                      int y2)

Draws an arrow. The positions specified here may not be the actual positions of the head and tail; if padding is in use they will stop short of those.

Parameters:

g2 - graphics context

x1 - nominal X coordinate of start (tail) position

y1 - nominal Y coordinate of start (tail) position

x2 - nominal X coordinate of end (head) position

y2 - nominal Y coordinate of end (head) position

drawArrow

protected abstract void drawArrow(Graphics2D g2,
                                  int x1)

Does the shape-specific work of drawing the arrow. Draws an arrow line and head from (x1, 0) to the origin.

Parameters:

g2 - graphics context

x1 - X coordinate of tail of arrow; x1 >= 0

setPad

public void setPad(int pad)

Sets padding. This is the number of pixels to leave blank at each end of the arrow trajectory.

Parameters:

pad - padding in pixels

createFilledArrow

public static Arrow createFilledArrow(int lpar,
                                      int lperp)

Returns an arrow instance with a filled head.

Parameters:

lpar - head length parallel to the trajectory

lperp - head half-width perpendicular to the trajectory