Package 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 Details

  • Constructor Details

    • DefaultCanvasLogicHandler

      public DefaultCanvasLogicHandler(AbstractBarcodeBean bcBean, Canvas canvas)
      Main constructor.
      Parameters:
      bcBean - the barcode implementation class
      canvas - the canvas to paint to

  • Method Details

    • 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

    • 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

    • 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

    • getTextBaselinePosition

      protected double getTextBaselinePosition()
      Returns the vertical text baseline position.
      Returns:
      the vertical text baseline position