edu.mit.sketch.toolkit
Class Classifier

java.lang.Object
  |
  +--edu.mit.sketch.toolkit.Classifier

Direct Known Subclasses:

SimpleClassifier

public abstract class Classifier

extends Object

This is the interface for a basic recognition toolkit. The Classifier will deal with single stroke input only. There is a Classifier object associated with each stroke. In conjunction with this class is the StrokeData class. The users must creare a StrokeData object and pass it to this class.

Field Summary

static int	COMPLEX Constant for COMPLEX
static int	ELLIPSE Constant for ELLIPSE
protected ErrorCalculator	error_calculator The error calculator
static int	LINE Constant for line
static int	POLYGON Constant for POLYGON
protected StrokeData	stroke_data The stroke data

Constructor Summary

Classifier()

Method Summary

abstract int	classify() Returns the best fit type for the strokeData
abstract int[]	classify(double error_bound) Returns the set of types that fit the stroke with error value less than the bound specified.
abstract GeneralPath	getComplexApproximation() Returns the best fit Polygon for the StrokeData.
abstract double	getComplexError() Returns the error between the best fit GeneralPath and the strokeData.
abstract Ellipse	getEllipseApproximation() Returns the best fit Polygon for the StrokeData.
abstract double	getEllipseError() Returns the error between the best fit ellipse and the strokeData.
abstract Line	getLineApproximation() Returns the best fit Polygon for the StrokeData.
abstract double	getLineError() Returns the error between the best fit line and the strokeData.
abstract Polygon	getPolygonApproximation() Returns the best fit Polygon for the StrokeData.
abstract double	getPolygonError() Returns the error between the best fit polygon and the strokeData.
abstract boolean	isComplex() Returns true if the best fit for the strokeData is a complex shape.
abstract boolean	isComplex(double error_bound) Returns true if the best fit complex shape has error measure less than error_bound.
abstract boolean	isEllipse() Returns true if the best fit for the strokeData is an Ellipse.
abstract boolean	isEllipse(double error_bound) Returns true if the best fit ellipse for the strokeData is less than error_bound.
abstract boolean	isLine() Returns true if the best fit shape for the strokeData is a Line.
abstract boolean	isLine(double error_bound) Returns true if the best fit line has an error of less than error_bound.
abstract boolean	isPolygon() Returns true if the best fit for strokeData is a polygon.
abstract boolean	isPolygon(double error_bound) Returns true if the best fit polygon has an error of less than bound.

Methods inherited from class java.lang.Object

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

Field Detail

POLYGON

public static final int POLYGON

Constant for POLYGON

ELLIPSE

public static final int ELLIPSE

Constant for ELLIPSE

COMPLEX

public static final int COMPLEX

Constant for COMPLEX

LINE

public static final int LINE

Constant for line

stroke_data

protected StrokeData stroke_data

The stroke data

error_calculator

protected ErrorCalculator error_calculator

The error calculator

Constructor Detail

Classifier

public Classifier()

Method Detail

classify

public abstract int classify()

Returns the best fit type for the strokeData

classify

public abstract int[] classify(double error_bound)

Returns the set of types that fit the stroke with error value less than the bound specified.

isPolygon

public abstract boolean isPolygon()

Returns true if the best fit for strokeData is a polygon.

isPolygon

public abstract boolean isPolygon(double error_bound)

Returns true if the best fit polygon has an error of less than bound. The error is calculated with the m_ErrorCalculator class, which by default uses squared error (unless another error calculator was passed in when the classifier was created.

isEllipse

public abstract boolean isEllipse()

Returns true if the best fit for the strokeData is an Ellipse.

isEllipse

public abstract boolean isEllipse(double error_bound)

Returns true if the best fit ellipse for the strokeData is less than error_bound.

isComplex

public abstract boolean isComplex()

Returns true if the best fit for the strokeData is a complex shape.

isComplex

public abstract boolean isComplex(double error_bound)

Returns true if the best fit complex shape has error measure less than error_bound.

isLine

public abstract boolean isLine()

Returns true if the best fit shape for the strokeData is a Line.

isLine

public abstract boolean isLine(double error_bound)

Returns true if the best fit line has an error of less than error_bound.

getPolygonError

public abstract double getPolygonError()

Returns the error between the best fit polygon and the strokeData. The error is calculated according to the ErrorCalculator, which uses squared error if not set by the user.

getEllipseError

public abstract double getEllipseError()

Returns the error between the best fit ellipse and the strokeData. The error is calculated according to the ErrorCalculator, which uses squared error if not set by the user.

getComplexError

public abstract double getComplexError()

Returns the error between the best fit GeneralPath and the strokeData. The error is calculated according to the ErrorCalculator, which uses squared error if not set by the user.

getLineError

public abstract double getLineError()

Returns the error between the best fit line and the strokeData. The error is calculated according to the ErrorCalculator, which uses squared error if not set by the user.

getPolygonApproximation

public abstract Polygon getPolygonApproximation()

Returns the best fit Polygon for the StrokeData. I have used the class OurPolygon here because we will be using a standard library of shapes which may or may not be the same as the Java defined shapes. (That has yet to be determined.)

getEllipseApproximation

public abstract Ellipse getEllipseApproximation()

Returns the best fit Polygon for the StrokeData. I have used the class OurPolygon here because we will be using a standard library of shapes which may or may not be the same as the Java defined shapes. (That has yet to be determined.)

getComplexApproximation

public abstract GeneralPath getComplexApproximation()

Returns the best fit Polygon for the StrokeData. I have used the class OurPolygon here because we will be using a standard library of shapes which may or may not be the same as the Java defined shapes. (That has yet to be determined.)

getLineApproximation

public abstract Line getLineApproximation()

Returns the best fit Polygon for the StrokeData. I have used the class OurPolygon here because we will be using a standard library of shapes which may or may not be the same as the Java defined shapes. (That has yet to be determined.)