IW - Window ; RO - Rotate coordinate system ; IW [ X1, Y1, X2, Y2 ] [;] - Page 165

2001/10/02 

CHAPTER 4 HP-GL/2 - 17 

IW - Window   

IW [ X1, Y1, X2, Y2 ] [;] 

X

1

-Window lower left X coordinate   

Y

1

-Window lower left Y coordinate 

X

2

-Window upper right X coordinate 

Y

2

-Window upper right Y coordinate 

• 

This instruction sets the window inside which drawing can be performed (the soft clip limits). 

• 

Coordinates are specified in current units. 

• 

Using this instruction with no parameters sets the window to be the same as the picture frame. 

• 

You can set the corners of the window to lie outside the picture frame.  However,  only the portion of the 
image which lies within both the picture frame and the window will appear on the page. 

• 

If scaling is turned on with the SC command before the window is defined with the IW command,  you can 
move the window on the physical page by specifying different locations for P1 and P2 with the IP and IR 
commands.  The user unit coordinates that bound the window remain the same. 

• 

If an SC command is used after the IW window definition,  the window is fixed on the physical page and 
does not move when subsequent IP and IR commands are invoked. 

• 

An IW command remains in effect until another IW command is issued,  until default settings are restored 
with the DF command or until the printer is initialized with an IN command. 

10 '--Input Window-- 

20 WIDTH "LPT1:",255 

30 LPRINT CHR$(27);"E"; 

40 LPRINT CHR$(27);"%0B"; 

50 LPRINT "IN;SP1;"; 

60 LPRINT "SI0.2,0.35,PA2000,3200;;LBTHIS IS AN EXAMPLE OF IW";CHR$(3) 

70 LPRINT "IW3000,1300,4500,3700;PD2000,1700;LBTHIS IS AN EXAMPLE OF 

IW";CHR$(3) 

80 LPRINT "PU3000,1300;PD4500,1300,4500,3700;PD3000,3700,3000,1300;PU;" 

90 LPRINT CHR$(27);"%0A"; 

100 LPRINT CHR$(27);"E"; 

110 END 

<Sample 22> 

RO - Rotate coordinate system   

RO [

q

][;] 

q

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

• 

This instruction is used to rotate the graphics coordinate system anti-clockwise. 

• 

Using this instruction with no parameter sets the rotation of the coordinate system to 0 degrees (default 
value). 

• 

The pen position does not change. 

• 

P1 and P2 rotate with the coordinate system and retain the same coordinate values. 

• 

To relocate P1 and P2 at the lower left and upper right hand corners of the picture frame,  use the IP or IR 
commands. 

• 

If you have previously used an IW command,  the window is also rotated.  Any part of the window that 
falls outside the hard clip limits will be clipped. 

• 

The command remains in effect until another RO command is used or until the printer is initialized with the IN 
instruction. 

• 

Valid values of 

q

 are 0, 90, 180 or 270. 

10 '--Rotate Coordinate System-- 

20 WIDTH "LPT1:",255 

30 LPRINT CHR$(27);"E"; 

40 LPRINT CHR$(27);"%0B"; 

50 LPRINT "IN;SP1;"; 

60 FOR I = 0 TO 270 STEP 90 

70 LPRINT "RO"; I; "PA1000,2000;PD3000,2000,2000,3000,1000,2000;PU;" 

80 LPRINT "LB RO ="; I; CHR$(3) 

90 LPRINT "PA600,1500;LBRotate Coordinate System";CHR$(3) 

100 NEXT I 

110 LPRINT CHR$(27);"%0A"; 

120 LPRINT CHR$(27);"E"; 

130 END 

<Sample 23>