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10/10/03
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 p
o
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
<Sample 76>