The default plotting unit (minimum step) is 0.1 mm in Survo PostScript
plotting.
On high resolution printers (600 dpi or more) this is not accurate enough
especially in curve plotting when best possible quality is demanded.
Therefore the plotting unit can be altered by a specification
PS_UNIT=<step> where PS_UNIT=0.1 is the default setting.
For high quality curve plotting PS_UNIT=0.01 is recommended.
Too accurate units should be avoided since the largest permitted size is
SIZE=32767,32767 i.e. about 32.7 cm x 32.7 cm for PS_UNIT=0.01 .
The following example (next page) illustrates the difference.
PLOT X(T)=R*COS(T),Y(T)=R*SIN(T)
R=10 XDIV=0,1,0 YDIV=0,1,0 HEADER= FRAME=0
T=0,2*pi,pi/120 pi=3.14159
DEVICE=PS,K1.PS
SIZE=1500,1500 PLOTTING WITH DEFAULT RESOLUTION
LINETYPE=[BLACK][line_width(0.48)]
................................................................................
PLOT X(T)=R*COS(T),Y(T)=R*SIN(T)
R=10 XDIV=0,1,0 YDIV=0,1,0 HEADER= FRAME=0
T=0,2*pi,pi/120 pi=3.14159
DEVICE=PS,K2.PS
SIZE=15000,15000
PS_UNIT=0.01 PLOTTING IN 0.01 mm RESOLUTION
LINETYPE=[RED][line_width(0.48)]
................................................................................
PRINT CUR+1,END TO K.PS / Red curve is smoother than the black one.
[scaling(35,35)][home(-550,-3000)]
picture K1.PS
picture K2.PS
P = More information on PostScript printing
Help System (web edition)