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5 P G
There is a special mode of operation, the pol?gon mode, in which many
commands are not executed but store the path they would otherwise draw in
the polygon buffer. The path is stored by storing the coordinates of all point
traversed, together with the pen up/down condition. When a appropriate
command isgiven, thepaths are drawn as if they formed a singlepath (which
is not necessarily connected).
The Star LaserPrinter 4111has a buffer capable of storing 1500points, with
pen up and down commands stored as points.
The following commands clear the polygon buffer and then use it to draw:
EA.ER,EW, RA, RR, WG.
The following commands usethepolygon buffer when inthepolygon mode:
AA, AR, AT, CI, PA, PD, PE, PR, PU, RT.
Other commands, if given in the polygon mode, are ignored.
If the polygon buffer overflows while executing a drawing (or edging)
command,
EPis executed. If the polygon buffer overflows while executing
a filling command, FP is executed. Points that cannot fit in the buffer are
ignored.
E r a c
EA x, ? [;]
This command draws a rectangle with the current cursor position as one
corner and the diagonally opposite corner at x, }’.
This command clears the polygon buffer, then uses the buffer to draw.
E p c
EP [;]
This command draws the edge of the polygon stored in the polygon buffer
(parts with the pen down). The contents of the buffer are not changed or
deleted.
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