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Graphics
When centering or right justification is used, the text strings are buffered (stored) until all of
the characters in the string have been received. The string end is detected by a CR or LF. The
string is not displayed until the CR or LF is received. This may be confusing when entering text
from the keyboard. The maximum length of a string when center or right justifying is 73
characters (not including the CR(LF)). In all cases, data written beyond the edge of the screen
is lost. There is no automatic RETURN when the screen boundary is reached.
TURNING GRAPHICS TEXT ON AND OFF. Graphics text mode can be turned on or off
from a program. These two commands use the
Ec
*
d
sequence but are discussed here under
graphics text for completeness.
On. This command will cause Graphics Text Mode to be turned on. All displayable characters
will be stored in the graphics memory. The current drawing mode remains in effect until a
command is issued to change modes.
Text is drawn using the current text assignments for size and orientation. Graphics text mode
accepts CR, LF, BS, HT, andVT as control characters. The
~, ~,
i,
~
keys can be used to position
the graphics cursor in character increments.
Turn On Graphics
Text Mode:
Turn Off Graphics
Text Mode:
Ec
*
d 5
Ec
*
d T
If the graphics cursor is moved, the graphics text margin is moved
to
the new cursor or pen
position.
Characters are drawn using the current drawing mode (set, clear, or jam). If set m...ode is used,
entering a character, backspacing, and entering a second character causes an overstrike. Ifjam
mode is used, the new character will replace the old character.
If a lower case
tt
s "
is used, additional escape parameters can be appended to the sequence.
Otherwise the next characters will be routed to the graphics memory.
Examples:
Ec
*
d
5
k 100,100
0
B
Ec
*
d 5 This is a text string
Off. This sequence turns offgraphics text mode and restores normal alphanumeric operation.
Turn Off Graphics
Text Mode:
Ec
*
d
t
Note that the. key or modify mode do not work on text in graphics text mode.
D-43
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