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- HP-GL COMMANDS
- --------------
-
-
- The following is a list of the HP-GL commands that are currently
- supported by PLT:. For the most part they were implemented from the
- descriptions provided in the "HP ColorPro Graphics Plotter Programming
- Manual". It appears as though every HP plotter has a slightly different
- set of HP-GL commands. Some have extra commands, some of the commands that
- have parameters for one plotter may not have parameters for a different
- plotter (PA and PR come to mind). We followed the manual pretty accurately,
- but we borrowed a couple of commands from a different plotter to control
- when a page is ejected from the plotter. For example, the AF command
- causes a page to be printed, this allows people to send several pages of
- plots to PLT: without having to break the input up into several files
- or several executions. Some commands in the manual were not emulated
- since they did not make sense for a raster emulation of a plotter.
-
-
-
- o The <term> symbol signifies a command terminator, it may be a space, a
- semi-colon or the first character of the next command.
-
- o Command names are NOT case sensitive.
-
- o Parameters that are incased in parenthesis in the command description
- are optional parameters. Do not use the paranthesis when specifying the
- command.
-
-
- ----------------------------------------------------------------------------
- ----------------------------------------------------------------------------
-
-
- Advance Full Page
- AF <term>
- Causes a page to be plotted/printed
-
-
- Designate Alternate Character Set
- CA font_number <term>
- CA <term>
- Selects font_number to be the alternate character set.
- The alternate character set is used as the current font
- through the use of the SA command.
- 0 <= font_number <= 50
-
-
- Character Plot
- CP spaces, lines <term>
- CP <term>
- Moves the pen the specified number of character plot cells.
- All movements are relative to the current label direction.
-
- spaces lines
- ----------------------------------------------
- positive move right move left
- negative move up move down
-
- A CP command with no parameters performs a carriage return and a
- line feed.
-
-
- Designate Standard Character Set
- CS font_number <term>
- Selects font_number to be the standard character set.
- The standard character set is used by default or
- through the use of the SS command.
- 0 <= font_number <= 50
-
-
- Default
- DF <term>
- Set certain plotter functions to predefined defaults.
- This command maintains the locations of P1 and P2.
-
- Default Conditions
-
- Function Equivalent Instructions Conditions
- -----------------------------------------------------------
- Plotting mode PA; Absolute
- Line type LT; Solid line
- Line pattern LT; 4% of (P1, P2)
- length
- Relative Character DR1,0; Horizontal
- Direction
- Relative Character SR; width=.75% of (P2x-P1x)
- Size height=1.5% of(P2y-P1y)
- Standard Character CS0; set 0
- Set
- Alternate Character CA0; set 0
- Set
- Character Set SS; standard
- Selected
- Character Slant SL0; 0 degrees
- Label Terminator DTetx; etx(ascii code 3)
- Symbol Mode SM; Off
- Tick Length TL; tp=tn=.5% of |P2x-P1x|
- for y tick
- tp=tn=.5% of |P2y-P1y|
- for x tick
- Scale SC; User-unit scaling off
-
-
- Absolute Direction
- DI run, rise <term>
- DI <term>
- Specifies the direction in which labels are drawn, independent of
- P2 and P1 settings. If no parameters are given, then the direction
- is set for horizontal.
-
- run = cos(angle)
- rise = sin(angle)
-
- angle = arctan(rise/run)
-
-
- Relative Direction
- DR run, rise <term>
- DR <term>
- Specifies the direction that labels are drawn relative to the
- scaling points P1 and P2. When the scaling points move, the
- label direction is adjusted to maintain the same relationship.
- A DR command with no parameters sets the direction for horizontal.
-
- run -- the percentage of P2x - P1x
- rise -- the percentage of P2y - P1y
-
-
- Define Label Terminator
- DT label_terminator <term>
- The character immediately following the DT command is used as
- the new label terminator. The label terminator is the
- character that signifies when the data for the label is complete
- so the plotter can start interpreting the input stream as commands
- again. Be careful not to place a space between the DT and the
- character that you want for the terminator. Otherwise the space
- will become the new terminator.
-
-
- Initialize
- IN <term>
- Returns the plotter to its power on state. Performs a DF AND:
-
- o raises the pen
- o sets P1 and P2 to the default states
- o cancels 90 degree rotation
-
-
-
- Input P1 and P2
- IP P1x, P1y (, P2x, P2y) <term>
- IP <term>
- P1 and P2 are used as scaling points for fonts as well as for
- establishing the location for a user-defined coordinate system.
-
- Can either specify the positions of both scaling points, just the
- first, or reset them to their defaults by specifying no parameters.
- If only P1 in specified, then P2 will move to keep the distance
- between P1 and P2 constant (P2 tracks P1).
-
- Defaults:
- ---------
- P1x = 250
- P1y = 279
- P2x = 10250
- P2y = 7479
-
-
- Label
- LB c...c <label_terminator>
- Puts text on the page starting at the current pen position.
- Every character between LB and <label_terminator> is plotted.
- <label_terminator> is usually ascii code 3, but can be set by
- the DT command. The LB command uses the current selected font
- and current label direction.
-
-
- Line Type
- LT pattern_number (, pattern_length) <term>
- LT <term>
- Selects the type of line that is plotted when the pen is down
- and moving. An LT command without a parameter specifies a solid line.
- Pattern 0 puts a dot at the endpoints of a line.
- Patterns 1-6 are dotted, dashed, dashed-dotted combinations.
-
- The length of the pattern can be specified through the use of
- pattern_length. It is expressed as the percentage of the
- diagonal distance between P1 and P2.
-
- Any portion of a pattern not used for the current line is
- carried over to the next line (provide a PU is not issued).
-
-
- Plot Absolute
- PA X, Y (, ...) <term>
- PA <term>
- Place the plotter in absolute mode. Causes all coordinates to then
- be interpretted as actual coordinates and not offsets from the
- current pen position. Coordinates can be specified with the
- command as well. It this case the pen is moved to the
- appropriate locations. If the pen is down a line will be drawn
- in the current pattern. If the pen is up then it is merely moved
- through the coordinates without drawing lines.
-
-
- Pen Down
- PD X, Y (, ...) <term>
- PD <term>
- Places the pen down onto the paper. If coordinates are specified
- then the pen is moved to those locations (absolutely or relatively
- depending on the current status). A line is drawn using the
- current pattern.
-
-
- Page Forward
- PG <term>
- Performs the same function as AF. Added to PLT: to allow greater
- compatibility with slightly different plotter command sets.
-
-
- Pen Up
- PU X, Y (, ...) <term>
- PU <term>
- Raises the pen. If coordinates are given then the pen is moved
- (relatively or absolutely depending on the current status) to the
- specified locations.
-
-
-
- Rotate
- RO n <term>
- RO <term>
- Rotate the page to 0 or 90 degrees. Used for making plots in
- portrait mode. n can either be 0 or 90. If no parameters are
- given then n is taken to be 0. P1 an P2 rotate with the coordinate
- system, but they maintain the same (x,y) positions. This means that
- P2 can be located outside the drawing area. Following a RO 90; by
- an IP; will set P1 and P2 to the soft-clip limits.
-
-
-
- Select Alternate Character Set
- SA <term>
- Future labels will be drawn using the alternate character set as
- the font. This font can be set using the CA command.
-
-
- Scale
- SC Xmin, Xmax, Ymin, Ymax <term>
- SC <term>
- Establishes a user-coordinate system by mapping values onto the
- scaling points P1, P2. All subsequent moves will be interpretted
- as coordinates in this coordinated system. If no parameters are
- given the scaling is turned off.
-
-
-
- Absolute Character Size
- SI width, height <term>
- Si <term>
- Specifies the size of character in centimeters. This establishes
- character sizes regardless of the locations of the scaling points.
- With no parameters, the default sizes are used.
-
-
- Character Slant
- SL tan_angle <term>
- SL <term>
- Specifies the slant given to characters as they are drawn.
- Makes tht font look more like an italic font. tan_angle specifies
- how far off the vertical the font is slanted. Positive values
- slant the font clockwise off the vertical, negative values
- slant the font counter-clockwise. With no parameter, the font
- is not slanted at all.
-
-
- Symbol Mode
- SM character <term>
- SM <term>
- Places the plotter in symbol mode. On subsequent moves the
- character specified will be plotted at the various endpoints.
- Used for scatter plots and emphasizing line endpoints. With
- no parameters, symbol mode is turned off.
-
-
- Select Pen
- SP pen_number <term>
- SP <term>
- Use pen_number as the current pen. With no parameters, the pen
- is returned to the carousel. Pens can be different colors
- or different thicknesses.
- 0 <= pen_number <= 8
-
-
- Relative Character Size
- SR width, height <term>
- SR <term>
- Specifies the relative character size as a percentage of the
- distance between P1 and P2. When the positions of P1 and P2
- change, the size of the characters will also change to maintain the
- scale. Without parameters, the default sizes are used.
-
-
- Select Standard Character Set
- SS <term>
- Use the standard character set as the current font. The font
- used as the standard character set can be set using the CS command.
-
-
- Tick Length
- TL tp (, tn) <term>
- TL <term>
- Specifies the length of the tick marks for both the X and Y-axes.
- tp is the length of the positive portion of the tick (up or right),
- tn is the length of the negative portion of the tick (down or left).
- tp an tn are specified as a percentage of |P2x - P1x| and
- |P2y - P1y|. Y-ticks use |P2x - P1x|, X-ticks use |P2y - P1y|.
- To supress the negative portion of the tick, don not specify
- a tn. To supress the positive portion of the tick, specify 0 for the
- tp.
-
-
- X-axis Tick
- XT <term>
- Place a verticl tick mark at the current pen position. The length
- of the tick can be specified through the use of the TL command.
-
-
-
- Y-axis Tick
- YT <term>
- Place a horizontal tick mark at the current pen position. The
- length of the tick can be specified through the use of the TL
- command.
-
-