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Fundamentals of Dot Matrix Prlntlng
!O RESTORE
15 WIDTH “LPI!:“,255
20 LPRINT CHR$(??):“@“:CHR~(27):“~”
30 FOR L - 1 TO 2
40 LPPINT CHRt~27):“K”:CHRS~114)1CHR((O!:
50 FOR SPACE * f TO 100: LPRJNT CHMIO):: NEXT SPACE
60 FOR COL!! = 1 TO !4 : RERD C : LPRINT CHRSX):: NEXT COLtf
70 LPSINT : NEXT L
80 DllTA 14,16,34,64,140,140,!2~,!28,!40,140,64,!4,16,14
90 DATt? 224,!6.232,68,34,18,1~~1~,18,34,6~,232,16,224
!.OO LPR!NT CHRS(27~:“~“:LPRINT:LPRIN?:LPRINT
Let’s run the program and see if we can get a smile both on
the paper and on the face of the Gemini operator who’s creating
dot matrix graphics.
. . ..:.
:. ./.:.
:.,: :. .:..
:’ ,_-..
; .: :,::. .: .: i
.:’
- ‘4i
.,.:
k-..
.., --
.:.
:. ,. ,.:.:: :.
>)>
..: .. :.,:::
. . ,.
::, ., :.:
. . :.
Now, if you want to try a little something different, change line
40 to:
40 LPRINT CHR$(27); “L”; CHR$(114); CHR!§(O);
and run the program again. High-resolution packs the dots twice
as close together, horizontally. For the same size drawing, you
would need twice as many dots. Therefore, you’d have to send
twice as many print head control characters to Gemini.
By this time, you probably have a good idea of how Gemini
works and how to make use of its extensive features. You might
want to take some time now and explore your own ideas, based
on the information presented thus far. In the next chapter, we’ll
consider the use of special symbol characters, block graphics, and
some advanced graphic techniques.
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