AA - Draw absolute arc ; AA [ X, Y, qc [, qd ]] [;] - Page 168

2001/10/02 

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 0.5° to 180°.  The default value is 5°. 

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>