PR - Relative coordinate pen move ; PR [X, Y [,...]] [;] - Page 361

CHAPTER 9 HP-GL - 10 

Current position

(X1, Y1)

(X2,Y2)

(X3, Y3)

(Xn, Yn)

 
10 '*** PAEX1 *** 
20 LPRINT "IN;SP1;" 
30 LPRINT "PA2000,6000;PD0,6000,2000,7500,2000,6000;PU2500,6000;" 
40 LPRINT "PAPD4500,6000,2500,7500,2500,6000;PU10365,500;" 
50 END 
 
<Sample 62> 
 
10 ' *** PAEX2 *** 
20 LPRINT "IN;SP1;SC0,100,0,100;" 
30 LPRINT "PA50,30;PD25,30,50,50,50,30;PU55,30;" 
40 LPRINT "PAPD80,30,55,50,55,30,PU;" 
50 END 
 
<Sample 63> 

PR - Relative coordinate pen move 

PR [X, Y [,...]] [;] 

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



Coordinates are relative to the current position in user units or graphics units. 



Plots a straight line only when the pen is down. 



When scaling has been performed,  the cursor is moved by relative coordinates in user units. 



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 relative coordinates in graphics units. 



When there is no scaling, the coordinate values for X and Y are integer numbers. 

Current position

Y

X1

Y2

Y3

X3

10 ' *** prex 1 *** 
20 LPRINT "IN;SP1;" 
30 LPRINT "PA5000,4500,;PDPR-2000,0,2000,2000,0,-2000;PU500,0;" 
40 LPRINT "PD2000,0,-2000,2000,0,-2000;PU;" 
50 END 
 
<Sample 64>