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2006/05/31
CHAPTER 4 HP-GL/2 - 21
AR - Draw relative arc
AR 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 relative values in current units.
• Starting from the current cursor position the command plots an arc whose centre is at the relative coordinate
position (X,Y) and which has the specified arc and chord angles. The radius of the arc is 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.
• 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 Relative 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 "SC-100,100,-100,100;"
70 LPRINT
"PA-100,70;PD;PR30,0;AR0,-70,-90,15;AR70,0,90;PR60,0;PU;"
80 LPRINT CHR$(27); "%0A";
90 LPRINT CHR$(27); "E";
100 END
<Sample 27>
AT - Absolute arc three point
AT X
1
, Y
1
, X
2
, Y
2
[,qd] [;]
X
1
; x-coordinate of intermediate point Y
2
; y-coordinate of intermediate point
X
2
; x-coordinate of end point y
2
; y-coordinate of end point
qd ; the chord angle used to draw the arc
• All coordinates are absolute and in current units.
• The command draws an arc from the current position, through the specified intermediate position and
finishing at the specified end position.
• After completion of the command the current cursor position is at the end of the arc.
• An arc can be drawn clockwise or anti-clockwise.
• If the current scaling mode is not isotropic, the arc may be elliptical rather than circular.
• The chord angle must be in the range 0.5° to 180°.
• The default chord angle is 5°.
10 '--Absolute Arc Three Point--
20 WIDTH "LPT1:",255
30 LPRINT CHR$(27);"E";
40 LPRINT CHR$(27);"%0B";
50 LPRINT "IN;SP1;";
60 LPRINT "PA1000,100;PD2500,100;"
70 LPRINT "PU650,1150;PD1000,1150;"
80 LPRINT "PU650,450;PD1000,450;"
90 LPRINT "PU1000,100;PD1000,1500,2500,1500;"
100 LPRINT "AT3200,800,2500,1500;"
110 LPRINT "PU3200,900;PD;"
120 LPRINT "AT3300,800,3200,700;"
130 LPRINT "PU3300,800;PD3500,800;"
140 LPRINT CHR$(27);"%0A";
150 LPRINT CHR&(27);"E";
160 END
<Sample 28>