org.krysalis.barcode4j.impl

Class DefaultCanvasLogicHandler

java.lang.Object

org.krysalis.barcode4j.impl.DefaultCanvasLogicHandler

All Implemented Interfaces:

BarcodeLogicHandler, ClassicBarcodeLogicHandler

Direct Known Subclasses:

ITF14CanvasLogicHandler

public class DefaultCanvasLogicHandler
extends Object
implements ClassicBarcodeLogicHandler

Default Logic Handler implementation for painting on a Canvas.

Version:

$Id: DefaultCanvasLogicHandler.java,v 1.10 2009-03-11 10:42:15 jmaerki Exp $

Field Summary

Fields

Modifier and Type	Field and Description
protected AbstractBarcodeBean	bcBean the barcode bean
protected Canvas	canvas the canvas to paint on
protected BarcodeDimension	dimensions the barcode dimensions

Constructor Summary

Constructors

Constructor and Description
DefaultCanvasLogicHandler(AbstractBarcodeBean bcBean, Canvas canvas) Main constructor.

Method Summary

Modifier and Type	Method and Description
void	addBar(boolean black, int width) This method indicates a new bar to be painted.
void	endBarcode() This is always the last method called.
void	endBarGroup() This method indicates the end of a previously started bar group.
protected double	getStartX() Returns the start X position of the bars.
protected double	getStartY() Returns the start Y position of the bars.
protected double	getTextBaselinePosition() Returns the vertical text baseline position.
void	startBarcode(String msg, String formattedMsg) This is always the first method called.
void	startBarGroup(BarGroup type, String submsg) This method is called when a new group of bars is about to start.

Methods inherited from class java.lang.Object

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

Field Detail

bcBean

protected AbstractBarcodeBean bcBean

the barcode bean

canvas

protected Canvas canvas

the canvas to paint on

dimensions

protected BarcodeDimension dimensions

the barcode dimensions

Constructor Detail

DefaultCanvasLogicHandler

public DefaultCanvasLogicHandler(AbstractBarcodeBean bcBean,
                                 Canvas canvas)

Main constructor.

Parameters:

bcBean - the barcode implementation class

canvas - the canvas to paint to

Method Detail

getStartX

protected double getStartX()

Returns the start X position of the bars.

Returns:

the start X position of the bars.

getStartY

protected double getStartY()

Returns the start Y position of the bars.

Returns:

the start Y position of the bars.

startBarcode

public void startBarcode(String msg,
                         String formattedMsg)

This is always the first method called. It is called to inform the logic handler that a new barcode is about to be painted.

Specified by:

startBarcode in interface BarcodeLogicHandler

Parameters:

msg - full message to be encoded

formattedMsg - message as it is to be presented in the human-readable part

startBarGroup

public void startBarGroup(BarGroup type,
                          String submsg)

This method is called when a new group of bars is about to start. A group of bars may be generated by a character (or group of characters) of the message to be encoded or by a start/end control group.

Specified by:

startBarGroup in interface ClassicBarcodeLogicHandler

Parameters:

type - a constant indicating the type of group. The meaning of the integer values is implementation-dependant.

submsg - In case of parts of the message to be encoded this parameter holds the character or characters being encoded.

addBar

public void addBar(boolean black,
                   int width)

This method indicates a new bar to be painted.

Specified by:

addBar in interface ClassicBarcodeLogicHandler

Parameters:

black - True if the bar is to be painted black, False if white/transparent

width - logical weight of the bar. Concrete implementations are free to define this to be height or width. For example, 1 may be interpreted as "narrow bar", 2 as "wide bar" for certain barcodes. While other barcodes might define 1 to be "short bar", 2 as "tall bar". Also, this should not be confused with the effective painting width, or the actual physical size of the bar.

endBarGroup

public void endBarGroup()

This method indicates the end of a previously started bar group. The method calls to startBarGroup and endBarGroup form a stack.

Specified by:

endBarGroup in interface ClassicBarcodeLogicHandler

endBarcode

public void endBarcode()

This is always the last method called. It is called to inform the logic handler that the generation of barcode logic has stopped.

Specified by:

endBarcode in interface BarcodeLogicHandler

getTextBaselinePosition

protected double getTextBaselinePosition()

Returns the vertical text baseline position.

Returns:

the vertical text baseline position