LT - Line type selection ; LT [, - Page 181

2001/10/02 

CHAPTER 4 HP-GL/2 - 33 

LT - Line type selection 

LT [, 

n

 [, 

p 

[,

m 

]]] [;] 

n

 ; Line pattern number 

p

 ; Line pattern length (percentage or millimeters of distance between P1 and P2) 

m

 : mode 

• 

This command specifies the line pattern for use when drawing lines with the vector group commands. 

• 

n

 defines the line type to be used.  

n

 is either in the range -8 to 8 or is 99. 

• 

Values of 

n

 from 1 to 8 specify a line type (as defined with the UL command) and use a fixed pattern length.  

Any residual part of the pattern not used on a part icular drawing operation is stored and used at the start of 
the next line drawn. 

• 

Values of n from -1 to -8 specify a line type (as defined with the UL command) and use an adaptive pattern 
length - that is, the pattern is scaled so as to fit one or more complete patterns into the line. 

• 

If n is 0,  a dot is placed at the (X, Y) coordinates specified with any vector commands used. 

• 

p

, the pattern length, specifies the length of one complete pattern,  either as a percentage of the distance 

between P1 and P2 or in millimeters.  The unit system used is determined by the mode setting.  If the length 
is omitted, the printer uses the most recently specified pattern length.   

• 

If a zero or negative pattern length is specified the command is ignored. 

• 

m

, the mode, defines whether the pattern length parameter, p, is interpreted as a reading in millimeters, (m=1), 

or as a percentage of the distance between P1 and P2, (m=0).  If no mode number is included in the 
command, the most recently specified mode is used. 

• 

LT99; restores the previous line type (and, if it is a fixed line type,  the residue), provided that the current line 
type is solid and that the pen position is the same as it was when the current,  solid line type was selected. 

• 

An LT command remains in effect until another LT command is issued,  until the default settings are restored 
with the DF command  or until the printer is initialized with an IN command. 

• 

If no parameters are specified the line type is set to be solid.  The previous line type,  pattern length and 
any line residue are saved. 

10 ' - Line Type - 

20 WIDTH "LPT1:", 255 

30 LPRINT CHR$(27); "E"; 

40 LPRINT CHR$(27); "%0B"; 

50 LPRINT "IN;IP1000,1000,9000,7000;SP1;"; 

60 LPRINT "PA2000,7100;PDPR400,0;PU;" 'REM DEFAULT LINE = 400 

70 LPRINT "LT8;PA2000,7000;PD5000,7000;PU;" 

80 LPRINT "LT8,4,0;PA2000,6900;PD5000,6900;PU;" 

90 LPRINT "LT8,8,1;PA2000,6800;PD5000L6800;PU;" 

100 ' 

110 LPRINT "LT4,PA2000,6600;PD5000,6600;PU;" 

120 LPRINT "LT4,4,0;PA2000;6500;PD5000;6600;PU;" 

130 LPRINT "LT4,10,1;PA2000,6400;PD5000,6400;PU;" 

140 ' 

150 LPRINT "LT0;PA2000,6300;PD5000,6200; PU;" 

160 LPRINT "LT0,4,0;PA2000,6100;PD5000,61000;PU;" 

170 LPRINT "LT0,10,1;PA2000,6000;PD5000,6000;PU;" 

180 ' 

190 LPRINT "LT-4;PA2000,5800;PD5000,5800;PU;" 

200 LPRINT "LT-4,4,0;PA2000,5700;PD5000;5700;PU;" 

210 LPRINT "LT-4,10,1;PA2000,5600;PD5000,5600;PU;" 

220 ' 

230 LPRINT "LT-8;PA2000,5400;PD5000,5400;PU;" 

240 LPRINT "LT-8,4,0;PA2000,5300;PD5000,5300;PU;" 

250 LPRINT "LT08,10,1;PA2000,5200;PD5000,5200;PU;" 

260 ' 

270 LPRINT "LT99;PA2000,5000;PD5000,5000;PU;" 

280 LPRINT CHR$(27); "%0A"; 

290 LPRINT CHR$(27); "E"; 

300 END 

<Sample 41>