Graphics Drawing Mode Parameters - HP 262SA Reference Manual

Graphics
GRAPHICS DISPLAY SET/CLEAR.
The graphics data currently displayed on the screen
can be set to all ones (a white screen) or cleared to all zeros (a black screen).
Clear Graphics Memory:
Ec*da
Set Graphics Memory:
Ec*db
You can clear graphics data on the screen from the keyboard by pressing G. CLEAR on the
graphics/numeric pad.
GRAPHICS DRAWING MODE PARAMETERS
There are several drawing parameters that can be set to allow a wide variety of drawing
capabilities. These parameters select whether data will be stored in the graphics memory as l's
or D's, define line or area patterns to be used when drawing vectors, position the relocatable
origin, and define graphics text settings.
Graphics drawing control sequences begin with
Ec
*
m
followed by one or more of the drawing
parameters. Table D-4 lists the mode control commands.
Drawing Modes
Vectors can be drawn by setting, clearing, or complementing the data in the graphics memory.
Normally the memory is cleared and vectors are drawn by setting selected bits to make white
lines on a dark screen. If instead you want black vectors on a white screen, you can begin by
setting memory (refer to the Set Memory command), select a clear or complement line type and
draw dark vectors (refer to the example that follows). Figure D-2 illustrates the various
drawing modes.
Table D-4. Graphics Mode Commands
Ec * m <parameters>
PARAMETERS DESCRIPTION
a
select drawing mode
b
select line type
c
define user line pattern
d
define user area fill pattern
e
rectangular area fill, absolute
f
rectangular area fill, relocatable
9
select area fill pattern
h
select area boundary pen
j
set relocatable origin to absolute coordinates
k
set relocatable origin to current pen position
1
set relocatable origin to graphics cursor position
m set graphics text size
n
set graphics text direction
0
turn on character slant
r
p
turn off character slant
q
set text origin
r
set graphics defaults
z NOP
D-9