jfig.commands
Class CreateCircleCommand

java.lang.Object
  jfig.commands.Command
      jfig.commands.CreateCircleCommand

public class CreateCircleCommand

extends Command

create a circle object.

CreateCircleCommand allows the user to create a circle specified by its center point and one point on the diameter.

Field Summary

protected FigAttribs	attribs
protected FigObject	circle
protected int	n_points
protected java.awt.Point	P1
protected java.awt.Point	P2

Fields inherited from class jfig.commands.Command

editor, objectCanvas, ready

Constructor Summary

CreateCircleCommand(FigBasicEditor editor, FigCanvas objectCanvas)

Method Summary

void	execute() execute the current editor command
java.lang.String	getDescription() one-line description of this command
FigObject[]	getModifiedObjects() return an array-wrapped reference to the circle object created by this command.
void	mousePressed(FigCanvasEvent evt) react to a mouse click on the editor canvas
java.lang.String	toString() return a (possibly verbose) description of this Command object
void	undo() undo this command

Methods inherited from class jfig.commands.Command

cancel, isReady, message, notifyEditor, statusMessage

Methods inherited from class java.lang.Object

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

Field Detail

n_points

protected int n_points

circle

protected FigObject circle

attribs

protected FigAttribs attribs

P1

protected java.awt.Point P1

P2

protected java.awt.Point P2

Constructor Detail

CreateCircleCommand

public CreateCircleCommand(FigBasicEditor editor,
                           FigCanvas objectCanvas)

Method Detail

getModifiedObjects

public FigObject[] getModifiedObjects()

return an array-wrapped reference to the circle object created by this command. The circle reference may be null.

Overrides:

getModifiedObjects in class Command

execute

public void execute()

Description copied from class: Command

execute the current editor command

This method is empty for class Command.

Overrides:

execute in class Command

undo

public void undo()

Description copied from class: Command

undo this command

Try to undo this command as far as possible. Don't try to undo() a command that has never been execute()d before. This method is empty for class Command.

Overrides:

undo in class Command

mousePressed

public void mousePressed(FigCanvasEvent evt)

Description copied from class: Command

react to a mouse click on the editor canvas

This method provides the central callback from the editor to its current command object. Passing a FigCanvasEvent parameter, the editor provides information both about the screen coordinates and the world coordinates of the mouse event.

Naturally, mouse presses are ignored for class Command.

Overrides:

mousePressed in class Command

getDescription

public java.lang.String getDescription()

Description copied from class: Command

one-line description of this command

return a one-line desription of this command, e.g. to label the undo/redo buttons, if any

Overrides:

getDescription in class Command

toString

public java.lang.String toString()

Description copied from class: Command

return a (possibly verbose) description of this Command object

Overrides:

toString in class Command