3.3. Pen Control and Plot Instructions; IW - Input window ; RO - Rotate coordinate system - Page 359

CHAPTER 9 HP-GL - 8 

IW - Input window  

IW [ X

1

, Y

1

, X

2

, Y

2

 ] [;] 

X1-Window lower left X coordinate  

Y1-Window lower left Y coordinate 

X2-Window upper right X coordinate  

Y2-Window upper right Y coordinate 



This instruction sets the window inside which plotting can be performed. 



Graphic units are always used. 



Coordinate values for X1, Y1, X2 and Y2 are integer numbers from 0 to 32,767. 



The order of the pairs (X1, Y1) and (X2, Y2) may be reversed with no change in the window created:  "IW 
X1, Y1, X2, Y2" is identical in effect to "IW X2, Y2, X1, Y1". 



Using this instruction without a parameter field releases any previous limitations on the plot area. 

(X2,Y2)

(X1,Y1)

Window

Print paper

RO - Rotate coordinate system  

RO [

q

][;] 

q

 : Angle in degrees through which the coordinate system is rotated. 



This instruction rotates the coordinate system. 



A value of 0 or 90 must be used for q. 



Using this instruction without a parameter field sets the rotation of the coordinate system to 0 degrees. 

PG - Page feed 

PG [;] 



Executes a page feed 



After page feeding,  the cursor position return to the home position (0, 0).

3.3.

Pen Control and Plot Instructions 

Instruction Function 
PU Pen 

Up 

PD Pen 

Down 

PA Plot 

Absolute 

PR 

Relative Coordinate Pen Move 

AA 

Absolute Arc Plot 

AR 

Relative Arc Plot 

CI Circle