diva.sketch.toolbox

Class ZoomRecognizer

java.lang.Object

diva.sketch.toolbox.ModedIncrRecognizer

diva.sketch.toolbox.ZoomRecognizer

All Implemented Interfaces:

StrokeRecognizer

public class ZoomRecognizer
extends ModedIncrRecognizer

A recognizer that recognizes "zoom" gestures ("Z") and then zooms in if the the events are "down" and out if the events are "up". ZoomRecognizer calls upon a ClassifyingRecognizer to recognize "Z". Since ClassifyingRecognizer reports results by dispatching events to its listeners, we use a local classification listener in the ZoomRecognizer to receive the events and report back to the ZoomRecognizer.

Version:

$Revision: 1.8 $

Author:

Michael Shilman (michaels@eecs.berkeley.edu), Heloise Hse (hwawen@eecs.berkeley.edu)

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ZoomRecognizer.ZoomData A classification type for zooming.

Field Summary

Fields

Modifier and Type	Field and Description
static String	LETTER_Z

Fields inherited from class diva.sketch.toolbox.ModedIncrRecognizer

ACTION, IDLE, UNKNOWN

Constructor Summary

Constructors

Constructor and Description
ZoomRecognizer(double zoomFactor, StrokeRecognizer r) Construct a zoom recognizer with the given scaling factor and a classifying recognizer which has been trained on "Z" shapes..
ZoomRecognizer(StrokeRecognizer r) Construct a zoom recognizer with a default scaling factor of 1.0 and a classifying recognizer which has been trained on "Z" shapes.

Method Summary

Modifier and Type	Method and Description
double	getZoomFactor() Return the zoom scaling factor for this recognizer.
RecognitionSet	processActionStroke(TimedStroke s) Emit zoom events based on whether the mouse has gone up or down.
int	recognizeActionSignal(TimedStroke s) Perform the recognition of the "Z".
void	setZoomFactor(double zoomFactor) Set the zoom scaling factor for this recognizer.

Methods inherited from class diva.sketch.toolbox.ModedIncrRecognizer

strokeCompleted, strokeModified, strokeStarted

Methods inherited from class java.lang.Object

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

Field Detail

LETTER_Z

public static final String LETTER_Z

See Also:

Constant Field Values

Constructor Detail

ZoomRecognizer

public ZoomRecognizer(StrokeRecognizer r)

Construct a zoom recognizer with a default scaling factor of 1.0 and a classifying recognizer which has been trained on "Z" shapes.

ZoomRecognizer

public ZoomRecognizer(double zoomFactor,
                      StrokeRecognizer r)

Construct a zoom recognizer with the given scaling factor and a classifying recognizer which has been trained on "Z" shapes..

See Also:

setZoomFactor(double)

Method Detail

getZoomFactor

public double getZoomFactor()

Return the zoom scaling factor for this recognizer.

See Also:

setZoomFactor(double)

processActionStroke

public RecognitionSet processActionStroke(TimedStroke s)

Emit zoom events based on whether the mouse has gone up or down.

Specified by:

processActionStroke in class ModedIncrRecognizer

recognizeActionSignal

public int recognizeActionSignal(TimedStroke s)

Perform the recognition of the "Z".

Specified by:

recognizeActionSignal in class ModedIncrRecognizer

setZoomFactor

public void setZoomFactor(double zoomFactor)

Set the zoom scaling factor for this recognizer. XXX