CHAPTER 4 HP-GL/2 - 22
RT - Relative arc three point
RT 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
The specified coordinates of the two points are relative to the current pen position.
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 0.5º to 180º.
The default chord angle is 5º.
10 '--Relative 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;PR;PD1500,0;"
70 LPRINT "PU-1850,1050;PD350,0;"
80 LPRINT "PU-350,-700;PD350;0;"
90 LPRINT "PU0,-350;PD0,1500,1500,0;"
100 LPRINT "RT800,-750,0,-1500;"
110 LPRINT "PU700,850;PD;"
120 LPRINT "RT100,-100,0,-200;"
130 LPRINT "PU100,100;PD200,0;"
140 LPRINT CHR&(27); "%0A";
150 LPRINT CHR$(27); "E";
160 END
<Sample 29>
PE - Polyline encoded
PE [ [flag] [value] | X
i
Y
i
... [flag] [value] | X
i
Y
i
] ];
flag ; a command or mode that applies to the data that follows
value; parameter data for the preceding flag
X ; X-coordinate of a cursor movement destination
Y ; Y-coordinate of a cursor movement destination
This command allows you to combine a sequence of PA, PR, PU, PD and SP commands into a coded format.
This reduces file size and transmission time.
Do not use commas within the PE command. Parameters either have their own terminators or do not
require them.
The PE command must be terminated with a semi-colon.
The command draws lines using the current line type and current units.
The command draws lines to all coordinate points specified unless you precede the coordinate pair with a
pen up flag.
On completion of the command, the pen is down unless the final move was made with the pen up.
All coordinate points are interpreted as relative unless preceded by the absolute flag (=).
On completion of the command, the previous plotting mode is restored.
Flags are not encoded. They are sent as ASCII characters. The MSB of the code is ignored, thus 60 and
188 can both represent <, the flag for pen up.
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