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2001/10/02
CHAPTER 9 HP-GL - 9
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.
• Moves the cursor to the specified coordinates after raising the pen.
• Using this instruction without a parameter field raises the pen without changing the cursor position.
• When scaling is on, user coordinates are used.
• Also, when scaling has been performed, the values for X and Y are real numbers.
• When scaling is off graphics units are used.
• When there is no scaling, the coordinates values for X and Y are integer numbers.
Current position
(X1, Y1)
(X2,Y2)
(X3, Y3)
(Xn, Yn)
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 set as default.
• Moves the cursor to the specified coordinates after lowering the pen. (This plots a straight line.)
• Using this instruction without a parameter lowers the pen without changing the cursor position. ( One dot is
plotted.)
• When scaling has been performed, the cursor is moved by user coordinates.
• Also, when scaling has been performed, the values for X and Y are real numbers.
• When there is no scaling, the cursor is moved by absolute coordinates in graphics units.
• When there is no scaling, the coordinate values for X and Y are integer numbers.
Current position
(X1, Y1)
(X2,Y2)
(X3, Y3)
(Xn, Yn)
PA - Plot absolute
PA [X, Y [,...]] [;]
X ; X coordinate of the cursor movement destination
Y ; Y coordinate of the cursor movement destination
• X and Y are absolute values in user units or graphics units.
• Moves the cursor to the specified coordinates.
• Plots a straight line only when the pen is down.
• When scaling has been performed, the values for X and Y are integer numbers.
• When there is no scaling, the cursor is moved by absolute coordinates in graphics units.
• When there is no scaling, the coordinate values for X and Y are integer numbers.