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2001/10/02
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 0.5° to 180°.
• The default chord angle is 5°.
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.