List of supported HP-GL commands:         Date: 99/01/31
=================================

hp2xx originally emulated a subset of the Hewlett-Packard 7550A plotter.
The following manuals were used as reference for command definitions:

     [1] "HP 7550A Interfacing and Programming Manual"
     [2] "HP Draftmaster Plotter Programmer's Reference"
     [3] "The HP-GL/2 Reference Guide", ISBN 0-201-56308-8

Not all commands are supported. Among the non-supported commands
are those which do not really apply to a software emulator, like:

   o commands affecting the communication between plotter and host computer,

   o commands for changing the behaviour of a real plotter, like
     plotting speed etc.,

   o commands for the control of plotter memory allocation,

   o commands causing various plotter outputs.


Other non-supported commands would be desirable, but were left out
due to their inherent complexity (or just because nobody pushed me, :-) ).
Among those are:

   o some of the commands for font (character set) management.
     Only the fixed space vector fonts 0-7 are available in this version

   o polygon mode 

   o fill [polygon/rectangle/wedge] commands and patterns


The remainder of this file tabulates all HP-GL commands listed on
pages 1-2 to 1-4 in [1] and marks them as either

      not applicable       (.),         
      ignored              (-),
      supported            (+), or
      partially supported  (*)

  I use the label "supported" when I think the command is fully supported
only in the context of the already implemented commands. In general,
you should have absolutely no problem with this class of commands.

  Though there still are unsupported commands, this does not mean that
you might have trouble using hp2xx. Nowadays, most HP-GL files are
machine-generated, e.g. by CAD or DTP programs. These tend to make use
of just a simple subset of HP-GL. To my experience, chances are high
that hp2xx will give you the picture you want!




HP-GL|s n| Description & Remarks
Cmd  | i |
=====|===|========================================================
 AA  |+  | Arc Absolute
 AC  | - | Anchor Corner (for fills)
 AD  | - | Alternate font Definition
 AF  |+  | Advance Full page [same as PG]
 AH  |+  | Advance Half page [same as PG]
 AP  |  .| Automatic pen operations
 AR  |+  | Arc Relative
 AS  |  .| Acceleration select
 AT  | - | Absolute arc Through three points
     |   |
 BP  |+  | Begin Plot (same as PG;IN)
 BL  |+  | Buffer Label
     |   |
 CA  |+  | Designate alternate character set
 CC  | - | Character Chord angle
 CF  | - | Character Fill mode
 CI  |+  | Circle
 CM  | - | Character selection mode
 CP  |+  | Character plot
 CR  | - | Color Range for relative color data
 CS  |+  | Designate standard character set
 CT  | - | Chord tolerance
 CV  | - | Curved line generator
     |   |
 DC  |  .| Digitize clear
 DF  |+  | Default
 DI  |+  | Absolute direction
 DL  | - | Define downloadable character
 DP  |  .| Digitize point
 DR  |+  | Relative direction
 DS  | - | Designate character into slot
 DT  |+  | Define label terminator
 DV  | - | Define Variable textpath
     |   |
 EA  |+  | Edge rectangle absolute
 EC  |  .| Enable paper Cutter
 EP  | - | Edge polygon 
 ER  | - | Edge rectangle relative
 ES  |+  | Extra space
 EW  |+  | Edge wedge
     |   |
 FI  | - | pcl Font Id
 FN  | - | pcl secondary Font Number
 FP  | - | Fill polygon
 FR  | - | FRame advance
 FS  |  .| Force select
 FT  | - | Fill type
     |   |
 GC  |  .| assign Group Count value
 GM  |  .| Graphics memory
     |   |
 IM  | - | Input error condition reporting Mask 
 IN  |+  | Initialize
 IP  |+  | Input P1 and P2
 IR  | - | Input Relative p1 and p2 locations
 IV  | - | Invoke character slot
 IW  |+  | Input window
     |   |
 KY  |  .| Define key
     |   |
 LA  | - | Line [ends and joins] Attributes
 LB  |+  | Label
 LO  |+  | Label origin
 LT  |+  | Line type
     |   |
 MC  | - | Merge Control [for color of overlapping pixels]
 MG  |+  | Message to Display (same as WD)
 MT  |  .| Media Type  
     |   |
 NP  |+  | Number of Pens
 NR  |  .| Not ready (unload page)
     |   |
 OA  |  .| Output actual position and pen status
 OC  |  .| Output commanded position and pen status
 OD  |  .| Output digitized point and pen status
 OE  | - | Output error
 OF  | - | Output factors
 OG  |  .| Output group count
 OH  | - | Output hard-clip limits
 OI  |  .| Output identification
 OK  |  .| Output key
 OL  | - | Output label length
 OO  |  .| Output options
 OP  |+  | Output P1 and P2
 OS  | - | Output status
 OT  |  .| Output carousel type
 OW  | - | Output window
     |   |
 PA  |+  | Plot absolute
 PB  |+  | Print buffered label
 PC  |+  | Pen color
 PD  |+  | Pen down
 PE  |*  | Polyline Encoded (fractional coordinates unsupported)
 PG  |+  | Page feed
 PR  |+  | Plot relative
 PS  |+  | Plot Size
 PT  | - | Pen thickness
 PU  |+  | Pen up
 PW  |+  | Pen width
     |   |
 QL  |  .| Quality Level
     |   |
 RA  | - | Fill rectangle absolute
 RF  | - | Raster Fill pattern definition
 RO  |+  | Rotate coordinate system 
 RP  | - | Replot
 RR  | - | Fill rectangle relative
 RT  | - | Relative arc Through three points
     |   |
 SA  |+  | Select alternate character set
 SB  |  .| Scalable or Bitmap font selection
 SC  |+  | Scale
 SD  | - | Standard font and attribute Definition
 SI  |+  | Absolute character size
 SL  |+  | Character slant
 SM  |+  | Symbol mode
 SP  |+  | Select pen
 SR  |+  | Relative character size
 SS  |+  | Select standard character set
 ST  |  .| Sort vectors for optimum plotting speed
 SV  | - | Screened Vectors [line and edge fill patterns]
     |   |
 TD  | - | Transparent Data [print control characters in labels]
 TL  |+  | Tick length
 TR  | - | TRansparency mode [opaquify white areas] 
     |   |
 UC  |+  | User-defined character
 UF  | - | User-defined fill type
 UL  | - | User-defined line type
     |   |
 VS  |  .| Velocity select
     |   |
 WD  |+  | Write to display
 WG  | - | Fill wedge
 WU  | - | pen Width Unit selection
     |   |
 XT  |+  | X-Tick
     |   |
 YT  |+  | Y-Tick

Useless statistics : this makes currently (3.3.0) 
49 fully supported, 1 partially supported, 23 not-applicable
and 44 unsupported commands.
