CHAPTER 4 HP-GL/2 - 25
7.4. The polygon group
Instruction Function
PM Polygon Mode
EA Edge Absolute Rectangle
ER Edge Relative Rectangle
EP Edge Polygon
EW Edge Wedge
RA Fill Absolute Rectangle
RR Fill Relative Rectangle
WG Fill Wedge
FP Fill Polygon
PM - Polygon mode
PM [ ms ] [;]
This command is used for entering and leaving polygon mode, the mode that allows you to access the
polygon buffer.
When in polygon mode you can use any of the vector group commands to define the vertices of a polygon.
The following commands can be used;
DF, IN, AA, AR, AT, BR, BZ, CI, PA, PD, PE, PR, PU, RT
The polygon you have defined is not printed until you exit polygon mode and fill or edge the polygon.
ms, the mode status, can have the value 0, 1 or 2. If ms = 0 the command empties the polygon buffer and
enters polygon mode. A value of 1 closes the current polygon and remains in polygon mode. All
commands sent following a PM1 before a PM2 or a further PM1 are used to build one sub-polygon. A
value of 2 closes the current polygon or sub-polygon and exits polygon mode.
Having exited polygon mode you can use the EP and FP commands to edge or fill the polygons you have
defined.
The EP command only draws between points defined when the pen was in the down position.
The FP command fills the area between the polygon vertices irrespective of whether the pen was up or down
when the polygon was defined.
The first point in the polygon buffer is the pen position when the PM0 command was invoked.
The next pen position specified after a PM1 command becomes the first vertex of the next sub-polygon.
When plotting a polygon the pen always moves to the first point in the up position.
Using the command with no parameters clears the polygon buffer and enters polygon mode. This is
equivalent to the PM0; command.
If a DF or IN command is invoked in the polygon mode, the printer quits polygon mode, clears the
polygon buffer and executes the subsequent command.
If an ESC E reset command is invoked while the printer is in polygon mode, the printer quits polygon
mode, clears the polygon buffer, exits HP-GL/2 and ejects the page.
EA - Edge rectangle absolute
EA X, Y[;]
X ; X coordinate of opposite corner for the rectangle
Y ; Y coordinate of opposite corner for the rectangle
X and Y coordinates are absolute coordinates in current units.
Plots the rectangle formed by the current position and the opposite corner specified by X and Y.
After plotting, the cursor returns to its point of origin and pen up/down status remains as selected.
Plotting is performed whether the pen is up or down.
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