AA - Draw absolute arc ; AA [ X, Y, qc [, qd ]] [;] - Page 176

CHAPTER 4 HP-GL/2 - 20 

AA - Draw absolute arc 

AA [ X, Y, qc [, qd ]] [;] 

X ; Arc centre X coordinate 

Y ; Arc centre Y coordinate 

qc

 ; Arc angle in degrees   

qd

 ; Chord angle in degrees   



Coordinates are absolute coordinates in current units. 



Starting from the current position, this command plots an arc centred on the absolute coordinates X, Y 
having the specified arc angle and chord angle, with the radius being the distance between the current 
position and the point X,Y. 



After execution of the command the cursor position is at the opposite end of the arc from the point at which 
plotting started. 



Plotting takes place only when the pen is down. 



If the command is invoked with the pen up,    plotting is not performed,    but the cursor position moves to 
what would have been the plot end point. 

(X,Y)

qc = Arc Angle

qd = Chord Angle



The value for 

qc

 is a clamped real number. 



When qc is positive, plotting is counterclockwise. 



When qc is negative, plotting is clockwise. 



The value for qd is a clamped real number in the range 0.5º to 180º.    The default value is 5º. 

10 '-- Draw Absolute Arc -- 
20 WIDTH "LPT1:",255 
30 LPRINT CHR$(27);"E"; 
40 LPRINT CHR$(27);"%0B"; 
50 LPRINT "IN;SP1;IP1000,1000,6000,6000;" 
60 LPRINT "SC0,100,0,100;" 
70 LPRINT "PA0,30;" 
80 LPRINT "PD;PA0,45;AA0,50,180;PA0,70;" 
90 LPRINT "AA0,100,900;PA100,55;AA100,50,180;PA100,30;" 
100 LPRINT "AA100,100,90;PA45,100;AA50,100,180;PA80,100;" 
110 LPRINT "AA100,0,90;PA55,0;AA50,0,180;PA30,0;AA0,0,90;" 
120 LPRINT "PU;PA50,50,CI20;" 
130 LPRINT CHR$(27); "%0A"; 
140 LPRINT CHR$(27); "E"; 
150 END 
 
<Sample 26>