ER - Edge rectangle relative ; EP - Edge polygon ; EW - Edge wedge - Page 182

CHAPTER 4 HP-GL/2 - 26 

10 '-Edge Rectangle Absolute- 
20 WIDTH "LPT1:", 255 
30 LPRINT CHR$(27); "E"; 
40 LPRINT CHR$(27); "%0B"; 
50 LPRINT "IN;SP1;"; 
60 LPRINT "SC0,150,0,150,1;" 
70 LPRINT "PA25;105;EA65;130;" 
80 LPRINT "PA30;110;EA70,135;" 
90 LPRINT "PA35;115;EA75;140;" 
100 LPRINT CHR$(27); "%0A"; 
110 LPRINT CHR$(27); "E"; 
120 END 

 
<sample 31> 

ER - Edge rectangle relative 

ER X, Y[;] 

X ; X coordinate of opposite corner for the rectangle 
Y ; Y coordinate of opposite corner for the rectangle 



Coordinates are relative to the current position in current units. 



Plots the rectangle formed by the current position and the opposite corner specified by X and Y. 



After plotting, the cursor returns to its point of origin. 



Plotting is performed whether the pen is up or down. 

10 '-Edge Rectangle Relative - 
20 WIDTH "LPT1:", 255 
30 LPRINT CHR$(27); "E"; 
40 LPRINT CHR$(27); "%0B"; 
50 LPRINT "IN;SP1;"; 
60 LPRINT "SC0;150;0;150;1;" 
70 LPRINT "PA25,105;ER40,25;" 
80 LPRINT "PR 5, 5;ER40,25;" 
90 LPRINT "PR 5, 5;ER40,25;" 
100 LPRINT CHR$(27); "%0A"; 
110 LPRINT CHR$(27); "E"; 
120  END    
 
<Sample 32> 

EP - Edge polygon 

EP [;] 



This command plots the outline of the polygon currently stored in the polygon buffer. 



The command only plots between points defined when the pen was down. 



The command plots an outline irrespective of whether the pen is currently up or down. 



The command does not affect the data in the polygon buffer. 



On completion of the plot the cursor returns to the original position. 

EW - Edge wedge 

EW 

r

,

q1

,

qc

(,

qd

)[;] 

r

 ; Radius in current units 

q1

; Start point angle 

qc

 ; Arc angle 

qd

 ; Chord angle 



Plots a wedge centred on the current position with radius 

r

, start point angle 

q1

, arc angle 

qc

 and chord angle 

qd

. 



After plotting, the cursor returns to its point of origin. 



Plotting is performed whether the pen is up or down. 



You should use this command with the type "isotropic".    Anisotropic type may make the wedge stretch.