Plot Area and Unit Setting Instructions ; IP - Input scaling point ; IR - Input relative scaling points - Page 162

2001/10/02 

CHAPTER 4 HP-GL/2 - 14 

7.2. 

Plot Area and Unit Setting Instructions 

Instruction 

Function 

IP 

Scaling point 

IR 

Input relative scaling points 

SC 

Scale 

IW 

Input window 

RO 

Rotate coordinate system 

IP - Input scaling point   

IP [ P1

X

, P1

Y 

[,P2

X,

 P2

Y

]] [;]  

P1

X

 ; 

X

 coordinate of P1 

P1

Y

 ; 

Y

 coordinate of P1 

P2

X

 ; 

X

 coordinate of P2 

P2

Y

 ; 

Y

 coordinate of P2 

• 

The coordinates used are absolute values in graphics units. 

• 

Set the location of the scaling points(P1,P2). 

• 

Coordinate values for P1

X

,P1

Y, 

P2

X

 and P2

Y

 are given as integer numbers. 

• 

You can set P1 and P2 to be anywhere that the range of allowable coordinates permits.  However,  only 
parts of resulting images that lie within the effective window will be printed. 

• 

The default location of P1 is the lower left corner and P2 is the upper right corner of the PCL picture frame. 

• 

Using this instruction without a parameter field initializes the scaling points(P1,P2) to the default location. 

• 

P2

X

 and P2

Y

 may be omitted.  If P2

X

 and P2

Y

 are omitted, P2 is set automatically so as not to alter the 

distance between P1 and P2. 

• 

If P2x and P2y are omitted P2 is set to be in the same position relative to P1 that it was before the command 
was invoked. 

• 

The IP command remains in effect until another IP command,  an IR command or an IN command is used. 

IR - Input relative scaling points 

IR [ P1x, P1y [, P2x, P2y]][;]

P1x ; x-coordinate of P1 

P1y ; y-coordinate of P1

P2x ; x-coordinate of P2 

P2y ; y-coordinate of P2 

• 

The coordinate values are percentages relative to the bottom left and top right hand corners of the picture 
frame. 

• 

Coordinate values for P1x, P1y, P2x, and P2y are treated as clamped real numbers. 

• 

Using this instruction without parameters sets the scaling points (P1, P2) to their initial positions, the bottom 
left and top right hand corners of the picture frame. 

• 

If P2x and P2y are omitted P2 is set to be in the same position relative to P1 that it was before the command 
was invoked. 

• 

You can set P1 and P2 to be anywhere that the range of allowable coordinates permits.  However,  only 
parts of resulting images that lie within the effective window will be printed. 

• 

The IR command remains in effect until another IR command,  and IP command or an IN command is used.