Pen Control and Plot Instructions ; PU - Pen up ; PD - Pen down - Page 166

2001/10/02 

CHAPTER 4 HP-GL/2 - 18 

7.3. 

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 

AT 

Absolute Three Point Arc  

RT 

Relative Three Point Arc 

PE 

Polyline Encoded 

CI 

Circle 

BR 

Bezier Relative 

BZ 

Bezier Absolute 

PU - Pen up   

PU [ X,Y [,...]] [;] 

X ; X coordinate of the cursor movement destination 
Y ; Y coordinate of the cursor movement destination 

• 

X and Y are either relative or absolute, depending on whether a PA or a PR was the last plot command 
executed.  The absolute coordinates are set as default. 

• 

You can specify as many coordinate pairs as you wish.  The cursor moves to each point in turn without 
drawing. 

• 

Using this instruction without a parameter field  raises the pen without changing the cursor position. 

• 

Coordinates are specified in the currently selected unit.

• 

In symbol mode PU draws the specified symbol at each point in the parameter list. 

• 

In polygon mode the specified coordinate pairs are placed in the polygon buffer. 

• 

If an odd number of coordinates are specified,  the final (unpaired) coordinate is ignored. 

PD - Pen down 

PD [ X, Y [,...]] [;] 

X ; X coordinate of the cursor movement destination 
Y ; Y coordinate of the cursor movement destination 

• 

X and Y are either relative or absolute, depending on whether a PA or a PR was the last plot command 
executed.  The absolute coordinates are the default setting. 

• 

You can specify as many coordinate pairs as you wish.  The cursor moves to each point in turn,  drawing 
lines on the page. 

• 

Using this instruction without a parameter lowers the pen without changing the cursor position. 

• 

Coordinates are specified in the currently selected unit. 

• 

In symbol mode PD draws the specified symbol at each defined point on the x- and y -axis. 

• 

In polygon mode the specified coordinate pairs are placed in the polygon buffer. 

• 

If an odd number of coordinates are specified,  the final (unpaired) coordinate is ignored.