org.tigris.gef.base
Class CmdZoom

java.lang.Object
  javax.swing.AbstractAction
      org.tigris.gef.base.Cmd
          org.tigris.gef.base.CmdZoom

All Implemented Interfaces:

java.awt.event.ActionListener, java.io.Serializable, java.lang.Cloneable, java.util.EventListener, javax.swing.Action

public class CmdZoom
extends Cmd

Cmd zoom the view. Needs-More-Work:

See Also:

Serialized Form

Field Summary

protected double

_magnitude

Fields inherited from class org.tigris.gef.base.Cmd

_args, _resource

Fields inherited from class javax.swing.AbstractAction

changeSupport, enabled

Fields inherited from interface javax.swing.Action

ACCELERATOR_KEY, ACTION_COMMAND_KEY, DEFAULT, LONG_DESCRIPTION, MNEMONIC_KEY, NAME, SHORT_DESCRIPTION, SMALL_ICON

Constructor Summary

CmdZoom()
Default behaviour is to restore scaling to 1.0 (1 to 1)

CmdZoom(double magnitude)
Each time doIt() is invoked, adjust scaling by a factor of magnitude.

Method Summary

void	doIt() Adjust the scale factor of the current editor.
void	undoIt() Undo the zoom.
protected static java.lang.String	wordFor(double magnitude) Convert the zoom magnitude to an English description.

Methods inherited from class org.tigris.gef.base.Cmd

about, actionPerformed, cmdAtIndex, containsArg, getArg, getArg, getName, getResource, register, registeredCmds, setArg, setName, setResource, shouldBeEnabled, updateEnabled

Methods inherited from class javax.swing.AbstractAction

addPropertyChangeListener, clone, firePropertyChange, getKeys, getPropertyChangeListeners, getValue, isEnabled, putValue, removePropertyChangeListener, setEnabled

Methods inherited from class java.lang.Object

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

Field Detail

_magnitude

protected double _magnitude

Constructor Detail

CmdZoom

public CmdZoom()

Default behaviour is to restore scaling to 1.0 (1 to 1)

CmdZoom

public CmdZoom(double magnitude)

Each time doIt() is invoked, adjust scaling by a factor of magnitude.

Parameters:

magnitude - the factor by which to adjust the Editor's scaling. Must be greater than or equal to zero. If zero, resets the Editor's scale factor to 1.

Method Detail

wordFor

protected static java.lang.String wordFor(double magnitude)

Convert the zoom magnitude to an English description.

doIt

public void doIt()

Adjust the scale factor of the current editor.

Specified by:

doIt in class Cmd

undoIt

public void undoIt()

Undo the zoom. Does not yet work for magnitude of 0 (a reset), and is subject to skew due to precision errors since for floats we cannot assume (x * f / f) == x

Specified by:

undoIt in class Cmd