SC - Scale ; SC [ X- Page 171

CHAPTER 4 HP-GL/2 - 15 

SC - Scale 

<HP-GL/2> 
SC [ X

min

, 

X

max

, Y

min

, Y

max 

[, type ]] [;] (Type = 0) 

SC [ X

min

, 

X

max

, Y

min

, Y

max

, 

type

 [ left, bottom]] [;] (

Type

 =1)

SC [ X

min

, X 

factor

, Y 

min

 Y 

factor

 [, 

type

 ]] [;] (

Type

 = 2) 

X

min

 ; X coordinate of P1   

X

max

 ; X coordinate of P2

Y

min

 ; Y coordinate of P1   

Y

max

 ; Y coordinate of P2 

Type

 ; type of scaling 

Left

 ; percentage of unused space to be left to the left of the scaling area 

bottom

 ; percentage of unused space to be left below the scaling area 

X

factor

 ; number of graphics units per user unit on the x-axis. 

Y

factor

 ; number of graphics units per user unit on the y-axis. 



This command turns scaling on and establishes a user unit coordinate system.    The coordinate system is 
specified relative to the points P1 and P2.    The origin need not necessarily be at P1.    Three different types 
of scaling are available. 



The technical terms, user unit and graphics unit, as used in this manual are defined as follows: 
  

User unit   

: the unit of the coordinates set by the SC instruction. 

Graphics unit    : the unit(1/1016 of an inch) of the coordinates not set by the    SC instruction. 



All coordinates are in user units. 



Coordinate values for X

min

, 

X

max

, Y

min

, and Y

max

are given as real numbers. 



X

min

, Y

min

, X

max

 and Y

max

 specify the range of the X- and Y-axes.    X

min

 and Y

min

 value should be P1 and 

X

max

 and Y

max

 should be P2. 



X

min

 must be different from X

max

, and Y

min

 must be different from Y

max

. 



Using this instruction without a parameter field turns the scaling off.   



Type

 can be 0, 1 or 2, which select scaling types known as anisotropic, isotropic and point factor scaling 

respectively. 



Type

 0 scaling (anisotropic scaling, the default) allows you to specify different sized x-axis and y-axis units.   

Hence the area specified by X

min

, 

X

max

, Y

min

, and Y

max

will occupy the entire area defined by P1 and P2. 

P1 (0,0)

P2 (7,6)



left and bottom settings have no effect in 

type

 0 scaling. 



Type

 1 scaling (isotropic scaling) forces x-axis and y-axis units to be the same size.    As a result the area 

specified by X

min

, 

X

max

, Y

min

, and Y

max

(the isotropic area) may not fit exactly into the rectangular area 

defined by P1 and P2. 

P1

(0,0)

(6,7)

P2