EW - Edge wedge ; EW r,q1,qc(,qd)[;] - Page 366

CHAPTER 9 HP-GL - 15 

EW - Edge wedge 

EW r,q1,qc(,qd)[;] 

r ; Radius in user units or graphics 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. 



When scaling has been performed, the circle is plotted in user units. 



Also, when scaling has been performed, the value for r is a real number. 



When there is no scaling, the circle is plotted in graphics units. 



When there is no scaling, the coordinate value for 

r

 is an integer number. 



The value for 

q1

 is a clamped real number. 

q1

qc

r

0° reference point

current

position



q1

 specifies the wedge starting point related to the 0 degree reference point.



When 

q1

 is positive, the positive direction of the X axis relative to the current position is set at 0 degrees and 

the start point is sought in the counterclockwise direction.  The opposite occurs when 

q1

 is negative: the 

negative X axis is set at 0 degrees and the start point is sought by going clockwise.



qc

 specifies the angle of the wedge in degrees.



The value for 

qc

 is a real number.



Plotting proceeds counterclockwise when 

qc

 is positive and clockwise when negative.



The value for 

qd

 is a clamped real number.



When 

qd

 is not specified, the chord angle is the default value ( 5 degrees ) 

10 ' *** EWEX *** 
20 LPRINT "IN;SP2;FT3,100;" 
30 LPRINT "PA5000,4000;" 
40 LPRINT "WG1250,90,180,5;" 
50 LPRINT "SP3;EW1250,90,180,5;" 
60 LPRINT "SP4,FT4,100,45;" 
70 LPRINT "WG1250,270,120;" 
80 LPRINT "SP3;EW1250,270,120;" 
80 LPRINT "SP1;PT.3;FT1;" 
100 LPRINT "WG1250,30,60;" 
110 LPRINT "SP3;EW1250,30,60;PG;" 
120 END 

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