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Think of the normal Cartesiancoordinatesystem in geometry,with its
horizontalx-axisandverticaly-axis.Inthissystemapoinl30unitsrightof
they-axisand 12unitsabovethex-axisisshownas(30,12).Anda point30
unitsrightof they-axisbut 12unitsbelowthex-axisis shownas (30,–12).
Theminussign showsits positionrelativeto the x-axis.
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That bottom right quadrantis where all the action happens in Diablo
graphics. HyPlotcallsthetop leftcomerof thepageits origin,andworks
downand to the rightfromthere.The onlydifferencebetweenCartesian
pointcoordinatesandHyPlotdotaddresseesis thatHyPlotneverneedsthe
negativesign:Cartesian(30,–12)is thesamepointas HyPlot(30, 12).
HyPlot: six steps
WithHyPlotyougo throughsix stepsto producea graphicsimage:
1)EnterHyPlotmode
2) Selectplottingstyle:absolute(measuredfromthe top left comer)or
relative(measuredfromthe startingprintposition)
3) Chooseplottingsymbol(dot,asterisk,etc.)
4) Set plottingprecision(in incrementsfrom 1/120to 31/120inch)
5) Describeplotvectors(acomplexwayofdefiningXandYcoordinates
for eachpointto be plotted)
6)LeaveHyPlotmode.
Theparticularcommandsyoucanusetoperformthesestepsaresummarized
in thetablebelow.The n] andn2variablesarc HyPlotvectorcoordinates.
IfyouwanttopursueHyPlotgraphicsfurther,consulttheXeroxDiablo630
manual.
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