Graphics

Here is the BASIC program that prints the design shown on the previous pages. Notice that the data numbers in lines 80-140 are the same numbers that you see in the last illustration. Also note that the WIDTH statement in line 10 is for IBM PC BASIC; the format may be different for your system.

10 WIDTH "LPT1:",255

20 LPRINT CHR$(27)"*"CHR$(39)CHR$(42)CHR$(0); 30 FOR X=1 TO 126

40 READ N

50 LPRINT CHR$(N);

60 NEXT X

70 LPRINT

80 DATA 0,0,63,0,0,127,0,0,255,0,3,255,0,15,255,0,31~255

90 DATA 0,127,255,0,255,255,1,255,255,3,255,255,7,255,255,15,

255,255

100 DATA 31,255,254,31,255,252,31,255,248,31,255,240,31,255,

224,31,255,192

110 DATA 31,255,0,31,252,0,31,240,0,31,224,0,31,128,0,31,240,0

120 DATA 31,255,192,28,255,224,28,127,240,28,15,248,30,0,252,

In this program, line 20 assigns the graphics option (24-element triple-density) with code 39. Code 42 sets the number of nozzle columns at 42. Lines 80-140 contain 126 bytes of data (42 nozzle columns X 3 bytes) for each nozzle column. Lines 30-60 print the design that you see below.

A

Notice that the dots overlap quite a bit. This design was printed using the triple-density 24-element graphics option because the density is the same 180 dots to the inch in both directions.

4-18 Software and Graphics