net.mumie.mathletfactory.action.handler.global

Class GlobalMouse3DTranslateHandler

java.lang.Object

net.mumie.mathletfactory.action.handler.global.GlobalHandler

net.mumie.mathletfactory.action.handler.global.Global3DHandler

net.mumie.mathletfactory.action.handler.global.GlobalMouse3DTranslateHandler

public class GlobalMouse3DTranslateHandler
extends Global3DHandler

This handler allows the user to translate himself in the world (thus virtually translating the scene in the other direction) by dragging the mouse with the right button pressed. The direction in which he is translated is the direction the mouse is dragged on the view plane (the screen coordinates transformed into world coordinates) the distance to be translated is proportional to the distance dragged.

Author:

Paehler

Document status:

finished

Field Summary

Fields inherited from class net.mumie.mathletfactory.action.handler.global.GlobalHandler

m_active, m_canvas

Constructor Summary

Constructors

Constructor and Description
GlobalMouse3DTranslateHandler(MM3DCanvas aCanvas) Constructs the handler to work in the given canvas.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	doAction(MMEvent event) Calculates the distance dragged and uses it for translation.
void	finish() Adds a snapshot to the history of the canvas.
boolean	userDefinedDealsWith(MMEvent anEvent) Returns whether this instance is able to work with the given MMEvent.

Methods inherited from class net.mumie.mathletfactory.action.handler.global.Global3DHandler

getCanvas3D

Methods inherited from class net.mumie.mathletfactory.action.handler.global.GlobalHandler

dealsWith, getCanvas, isActive, setActive

Methods inherited from class java.lang.Object

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

Constructor Detail

GlobalMouse3DTranslateHandler

public GlobalMouse3DTranslateHandler(MM3DCanvas aCanvas)

Constructs the handler to work in the given canvas.

Method Detail

finish

public void finish()

Adds a snapshot to the history of the canvas.

Overrides:

finish in class Global3DHandler

doAction

public boolean doAction(MMEvent event)

Calculates the distance dragged and uses it for translation. The (world draw coordinate) axis for the translation is the direction dragged in the view plane.

Specified by:

doAction in class GlobalHandler

See Also:

net.mumie.mathletfactory.action.handler.global.MMGlobalHandler#doAction(MMEvent)

userDefinedDealsWith

public boolean userDefinedDealsWith(MMEvent anEvent)

Description copied from class: GlobalHandler

Returns whether this instance is able to work with the given MMEvent.

This method will typically be called from within the controlAction(MMEvent) method of a CanvasControllerIF (e.g. DefaultCanvasController), to check if this instance can be invoked by calling this GlobalHandler's doAction method with the given MMEvent.
Attention: This method will always return false if GlobalHandler.isActive() returns false, i.e. if this GlobalHandler was deactivated.

Specified by:

userDefinedDealsWith in class GlobalHandler