Lexmark X864 Forms and Bar Code Technical Reference - Page 69

PostScript emulation

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6 PostScript emulation This section describes additional PostScript emulation operators that are supported when a Forms and Bar Code Card is installed. These operators enable printing of bar code symbologies with user specified parameters from within the PostScript data stream. This functionality is not available in the HP BarDIMM Pro. Defining characteristics The following operators let you further define characteristics of the bar code: Operator barcodeshow barcodebbox barcodewidth Characteristic Paints the specified bar code symbol Returns the coordinates for the bounding box Returns the x and y displacement of the currentpoint For more information on bar code characteristic parameters and default values, see "PostScript emulation operator" on page 68. Command structure considerations Developers should be familiar with the standard that defines the bar code symbology being implemented. The incoming data is analyzed for valid parameters, such as string length and string characters. When an invalid condition is detected, an error message is generated. For more information, see "PostScript error messages" on page 148. There are certain command structure considerations to follow when implementing bar code applications using the Forms and Bar Code Card. Characteristic values, other than the default value, must be explicitly specified. If no value is specified, the default value is used. Previously specified non-default values are not retained. Currentpoint positioning Currentpoint positioning is set as follows when printing with the Forms and Bar Code Card: • From the currentpoint, bar code printing begins at the bottom left corner of the bounding box. PostScript emulation 66

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PostScript emulation
66
6
PostScript emulation
This section describes additional PostScript emulation operators that are supported when a Forms
and Bar Code Card is installed.
These operators enable printing of bar code symbologies with user
specified parameters from within the PostScript data stream.
This functionality is not available in the
HP BarDIMM Pro.
Defining characteristics
The following operators let you further define characteristics of the bar code:
For more information on bar code characteristic parameters and default values, see “PostScript
emulation operator” on page 68.
Command structure considerations
Developers should be familiar with the standard that defines the bar code symbology being
implemented. The incoming data is analyzed for valid parameters, such as string length and string
characters. When an invalid condition is detected, an error message is generated. For more
information, see “PostScript error messages” on page 148.
There are certain command structure considerations to follow when implementing bar code
applications using the Forms and Bar Code Card.
Characteristic values, other than the default value,
must be explicitly specified. If no value is specified, the default value is used. Previously specified
non-default values are not retained.
Currentpoint positioning
Currentpoint positioning is set as follows when printing with the Forms and Bar Code Card:
•
From the currentpoint, bar code printing begins at the bottom left corner of the bounding box.
Operator
Characteristic
barcodeshow
Paints the specified bar code symbol
barcodebbox
Returns the coordinates for the bounding box
barcodewidth
Returns the x and y displacement of the currentpoint