SM - Symbol mode ; SP - Select pen ; SV - Screened vectors - Page 183

2001/10/02 

CHAPTER 4 HP-GL/2 - 35 

10 '--Raster Fill Definition== 

20 WIDTH "LPT1:", 255 

30 LPRINT CHR$(27); "E"; 

40 LPRINT CHR$(27); "%0B"; 

50 LPRINT "IN;SP1;"; 

60 LPRINT "PU5,5;PA3500,2500;" 

70 LPRINT 

"RF2,8,4,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,

0,;" 

80 LPRINT "FT11,2;RR4000,800;EP;" 

90 LPRINT CHR$(27); "%0A"; 

100 LPRINT CHR$(27); "E"; 

110 END 

<Sample 43> 

SM - Symbol mode 

SM 

c

[;] 

c

 ; ASCII character or symbol code 

• 

The command specifies the symbol to be drawn. 

• 

The specified symbol will be drawn at the end of each vector,  irrespective of whether the pen is up or down  
when the PA, PR, PD, PU or PE instructions are used. 

• 

Characters in the character code ranges 33 - 58, 60 - 126 and characters 161 and 254 can be used. 

• 

Character code 59 stands for the ';',  which is the HP-GL/2 terminator.  You cannot use it as a symbol. 

• 

The current character size,  slant and direction settings affect the way the symbol is drawn. 

• 

Omitting the parameter cancels the symbol mode. 

• 

On quitting symbol mode the original pen up/down state is restored. 

SP - Select pen 

SP [ 

n

 ] [;] 

n

 ; pen number 

• 

The command selects a pen for drawing. 

• 

You must use this command before performing any drawing or filling commands. 

• 

n

 should be either 0 or 1  ( although any other integers will be interpreted as 1.) 

• 

If 

n

 is 0 the white pen is selected.  In this case drawing commands will have no effect,  unless you are 

plotting onto a dark background and transparency mode is off. 

• 

If 

n

 is 1 the black pen is selected and printing can proceed normally.  Use SP1 at the start of HP-GL/2 

programs. 

• 

Invoking the command with no parameter is equivalent to SP0. 

SV - Screened vectors 

SV [ 

s

 [, 

option

_1[, 

option

_2]]] [;] 

s

 : screen type 

option_1

 and 

option_2: 

dependent on the screen type 

• 

This command selects the type of screening that will be applied to vectors,  arcs,  circles and edges of 
polygons,  rectangles and wedges. 

• 

The screen type must have the value 0, 1, 2, 21, 22 or 130.  0 = no screen,  1 = shaded fill ( one of eight gray 
scales ), 2 = raster fill as defined by the RF command,  21 = a pre-defined PCL cross-hatch pattern and 130 = 
shaded fill ( one of sixty-four gray scales ). 

• 

With screen type 1 

option_1

 specifies the percentage of shading (0-100): 

option_2

 is ignored. 

• 

With screen type 2 

option_1

 is used to specify the index number of the fill pattern created using the RF 

command.  

Option_2

 is set to either 0 or 1:  0 means that the fill will appear in the colour of pen number 1, 1 

means it should appear in the current pen's colour.