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Plotchart

Plotchart. Arjen Markus June 2010. Design goals. Easy to use: just a few commands for a plot Wide range of plot and chart types Extendable Its predecessor: emu_graph by Steve Cassidy. Design decisions. Use the whole canvas Fix the layout Simple form of clipping

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Plotchart

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  1. Plotchart Arjen Markus June 2010

  2. Design goals • Easy to use: just a few commands for a plot • Wide range of plot and chart types • Extendable Its predecessor: emu_graph by Steve Cassidy

  3. Design decisions • Use the whole canvas • Fix the layout • Simple form of clipping • Do not manage the data (duplication) • Changing the appearance takes effect for new data only

  4. Interface • Create the plot of the chosen type – new command • Fill in the data via subcommands • Details differ per plot type

  5. Implementation Some code – linking method names to procedures: set methodProc(xyplot,title) DrawTitle set methodProc(xyplot,xtext) DrawXtext set methodProc(xyplot,plot) DrawData set methodProc(xyplot,dot) DrawDot set methodProc(xyplot,dotconfig) DotConfigure set methodProc(xyplot,interval) DrawInterval set methodProc(xyplot,trend) DrawTrendLine set methodProc(piechart,plot) DrawPie set methodProc(piechart,saveplot) SavePlot

  6. Implementation – part 2 proc ::Plotchart::createPiechart { w } { variable data_series foreach s [array names data_series "$w,*"] { unset data_series($s) } set newchart "piechart_$w" interp alias {} $newchart {} ::Plotchart::PlotHandler piechart $w CopyConfig piechart $w foreach {pxmin pymin pxmax pymax} [MarginsCircle $w] {break} viewPort $w $pxmin $pymin $pxmax $pymax $w create oval $pxmin $pymin $pxmax $pymax SetColours $w blue lightblue green yellow orange red magenta brown DefaultLegend $w DefaultBalloon $w return $newchart }

  7. Implementation – part 3 proc ::Plotchart::PlotHandler { type w command args } { variable methodProc if { [info exists methodProc($type,$command)] } { eval $methodProc($type,$command) $w $args } else { return -code error "No such method - $command“ } }

  8. Implementation: contributions Many people have contributed with code or suggestions: Mark Stucky, Stefan Finzel, Paul Vogel, Dave Hanks, Michael Baudin, Steve Blinkhorn, … Jos DeCoster has developed xyplot on top of Plotchart

  9. Currently supported types • XY-plots (also logarithmic axes) • Contour plots (2D and 3D) • Histograms and piecharts • Time charts and Gantt charts • Radial charts Also: • various types of annotation • Combining plots in one canvas

  10. Demos • A few examples of Plotchart itself • Jos DeCoster’s xyplot • Experimental: SCADA display

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