这是最全的HPGL,PLT文件格式.doc

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这是最全的 HPGL 文件格式，因为在网上找到的，大部分都只有一部分，不完整，所以找了个英文完整版的。 Using HPGL as a drawing interchange media (Don't!Unfortunately many DOS/Windows insist on doing so) Written by Paul Bourke September 1992 This document isalso available in Russian , thanks to Sergey Paramonov. (You will need the Russian font set!) Introduction HPGL is the HPgraphics language designed for specifying 2D graphical information for the HPrange of plotters. It was not intended as an interchange format but somesoftware suppliers use it as such. At least it is efficient and easy to writeand read. This short note describes those aspects of the format which may beused to describe geometry. The language itself has a large number ofinstructions, most of the ones not touched on here relate directly to plotterdevices, for a full description of the language the HPGL description is normallyprovided with an HPGL compatable plotter. Basics HPGL commandsare basically two uppercase character instructions followed by any arguments,and finally ending in the separator character which is a semicolon by default.The arguments are normally separated by commas. String arguments are normallyterminated by carriage return. In what follows,all the standard HPGL commands are listed, those which are likely to be usefulfor data interchange will be discussed at the end of this document. Optionalarguments for any command are shown in brackets.

Commands Instruction Arguments AA Arc Absolute x,y,angle(,tolerance) AF Advance page AH Advance page AP Automatic Pen Operations n AR Arc Relative x,y,angle(,tolerance) AS Acceleration Select acceleration(,pennumber) BF Buffer Plot BL Buffer label string CA Select Alternative Charset set CC Character chord angle angle CI Circle radius(,tolerance) CM Character Selection Mode switchmode(,fallbackmode) CP Character Plot spaces,lines CS Select Standard Charset set CT Chord Tolerance n CV Curved line generator n(,inputdelay) CD Digitize Clear DF Default DI Absolute Direction run,rise

DL Define Download character charnumber(,pencontrol),x,y(...) DP Digitze Point DR Relative Direction run.rise DS Designate Charset slot,set DT Define Label Terminator terminator EA Edge Rectangle Absolute x,y EP Edge Polygon ER Edge Rectangle Relative x,y ES Extra Space spaces(,lines) EW Edge Wedge radius,startangle,sweepangle(,tolerance) FP Fill Polygon FS Force Select force(.pennumber) FT Fill Type type(,spacing(,angle)) GC Group Count countnumber GM Graphics Memory (polygonbuff)(,downloadbuff)(,replotbuff)(,vectorbuff) GP Group Pen (groupnumber(,pennumber(,numberofpens,(length)))) IM Input Mask emaskvalue(,smaskvalue(,pmaskvalue)) IN Initialize IP Input p1 and p2 x,y(,x,y) IV Invoke Character Slot slot,(left) IW Input Window x,y,x,y

KY Define Key key(,function) LB Label string LO Label Origin positionnumber LT Line Type patternnumber(,patternlength) NR Not Ready PA Plot Absolute x,y(,...) PB Print Buffered Label PD Pen Down x,y(,...) PG Page Feed PM Polygon Mode n n PR Plot Relative x,y(,...) PT Pen Thickness thickness PU Pen Up x,y(,...) RA Fill Rectangle Absolute x,y RO Rotate Coordinate System n RP Replot n RR Fill Rectangle Relative x,y SA Select Alternative Charset SC Scale x,y,x,y(,type(,left,bottom)) SG Select Pen Group groupnumber SI Absolute Character Size width,height

SL Character Slant tantheta SM Symbol Mode character SP Select Pen pennumber SR Relative Character Size width,height SS Select Standard Charset TL Tick Length tp(,tn) UC User Defined Character (pencontrol,)x,y UF User Defined Fill gap1(,gap2,...gap20) VS Velocity Select speed(,pennumber) WD Write to Display string WG Fill Wedge radius,startangle,sweepangle(,tolerance) XT X Tick YT Y Tick Output Instructions The followinginstructions don't have any arguments but rather generate output from theplotting device. They are of no use for interchanging geometric data andtherefore the form of the output is not discussed. See an HPGL reference book. OA Output Actual Position OC Output Position OD Output Digitised Point OE Output Error OF Output Factors

OG Output Group Count OH Output HardClip Limits OI Output Identification OK Output Key OL Output Label Length OO Output Options OP Output p1 and p2 OS Output Status OT Output Carousel Type OW Output Window Escape sequnces The followingescape sequences are generally only applicable when connected through a serialinterface to a physical plotter, they have nothing to do with data interchangeand so their arguments will not be listed nor will the form of the output mostof them create . esc@ Set Plotter Configuration escA Output Identification escB Output Buffer Space escE Output Extended error escH Set Handshake Mode 1 escI Set Handshake Mode 2 escJ Abort Device Control escK Abort Graphics

escL Output Buffer Size When Empty escM Set Output Mode escN Set Extended Output and Handshake Mode escO Output Extended Status escP Set Handshake Mode escQ Set Monitor Mode escR Reset escS Output Configurable Memory escT Allocate Configurable Memory escU End Flush Mode escY Plotter On esc( Plotter On escZ Plotter Off esc) Plotter Off Useful Commands with examples Since plottersare very basic line drawing hardware devices it is not surprising that the mostcommonly used commands are those that draw lines from one point to another. This operationis controlled by 4 commands, PA - plot absolute PR - plot relative PU - pen up PD - pen down

Pen up and downdictate when a line is actually being created, the plot commands do themovement between points. For example todraw a line from (1,0) to (2,0) might be specified as follows PU;PA1,0;PD;Pr1,0;PU; There are twobasic attributes that can be assigned to a line, as expected they are actuallyapplied to the pens of the plotting device. They are: SP - pen number PT - pen thickness The pen numbernormally acts as an indexed colour system, most commonly there are only 8 pens(colour) available. The othergeometry that can be specified is AR - arc relative CI - circle EA - edge rectangle absolute ER - edge rectangle relative EP - edge polygon EW - edge wedge LB - label There are alarge number of settings for controlling text, these and further details of theabove instructions will be left to the reader to experiment with or read in thefull HPGL manuals.

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