TAChart Roadmap

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Below is a list of items that would be good to have in TAChart. Some of them are planned for implementation by the current maintainer, others will require patches from interested contributors.

Editors

  • TChartExtent editor
  • series index list editor
  • ListSource.DataPoints editor: intergate with YCount
  • marks.format/style editor
  • margins editor
  • subcomponent editor
    • add shortcuts, use actions
    • convert to grid/checklist, show enabled/active checkboxes

Axises/Transformations

  • finish multiaxis
    • auto-scaling to percent range
    • partial-linear/local zoom transform (?)
    • inverted as transformation (?)
    • logBase 0 => e ?
  • non-decartes axises + XY transform (ternary, polar...)
  • various axis marks steps -- logarithmic etc.
  • fixed start/step interval source (?)
  • use Intrevals.Count in custom source
  • merge Intervals of axis and source (?)
    • advanced axis step controls -- targetStepSize(Pixels/Graph/Axis)...
  • test/fix inverted axis
  • axis.autoscale as a shortcut(?)
  • axis.DateTimeFormat(?)
  • axis.Depth
  • walls
  • YYYMMDD -> datetime transform(?)
  • LineRange(?)
  • arrows: fill color, pixel-symmetrical
  • fixed size/synchronize axis size between linked charts
  • "axis breaks" -- transformation?
  • Cartesian Distortion: http://bost.ocks.org/mike/fisheye/#cartesian

Series

  • 3-d series: bubble, box-and-whiskers(?), OHLC(?), func
  • fix 3-d pie series with exploded slices
  • bar: pyramid, code, cylinder, prism, number of faces
  • bug: all-negative area has no zero plane
  • top-down and right-to-left series
  • Z axis, XZ and YZ grids
  • polar axis
  • polar series: labels, brush, pointers
  • TConstantLine.Source -- use X only
  • 3-d surface
  • color map:
    • isolines & labels,
    • gradients,
    • data interpolation, auto-scale colors (thresholds in percent)
    • better design-time display,
    • transparency threshold (?) / ColorSource.Y as opacity (?)
  • range bar series
  • Gantt series (bar.starty, bar.startx, bar.endx)
  • stacked/donut pie series (?)
  • test/fix rotated stacked series
  • subcharts
  • GIS
  • func series: discontinuity pointers
  • slopegraphs, sparklines (?)
  • arrow series
  • use Hare-Niemer integer compensation to make sure that percents always add up to 100% (??)
  • pie chart slice grouping: MinSliceSize (?)
  • ternary charts (?)
  • measurement series
  • support infinity in more series

Legend

  • ColumnPerGroup
  • legend line per stack level
  • legendpanel.autosize -> scrollable with scrollbox
  • different widths for columns
  • arbitrary position

Tools

  • test/fix many charts per toolset
  • remove old reticule
  • xorpen/xortext in all drawers
  • label editor/notes
  • axis tools

Optimization

  • caches: graphpoints, imagepoints, layers/barriers
  • image cache for tools

Sources

  • OO (incompatible?)
  • YList in Marks.Format
  • calculated sources: optimization, sliding median, user-derined filter
  • derivative: Savitzky-Golay, non-equidistant X
  • bug: db-source does not auto-refresh after dataset changes (?)
  • support NaN in all series: func, ...
  • TColorSource (?)
  • more animations

Labels

  • fix labels with NaNs
  • margins
  • more frame shapes: rhumb, hexagon, octagon...
    • control shape corner size
  • fix/improve pie series label positioning
    • "sideband" positioning
    • special label attachments: "center", "side center", "nearest point"
  • auto-position labels: two-level, generic, GA
  • free labels (notes)
  • control label attachment (top, bottom, center, ...)
  • Styles stored false
  • measure non-symmetrical labels correctly

Presentation

  • embellishments: gradient, shadow, glow(?)
    • color->embellishment mapping(?)
  • Generic renderer (?): OpenGL, SVG, true 3-d
  • TCanvas-independent API: TChartPen, TChartBrush, TChartFont
  • panes (??)
  • styles: apply to more series, usecolor, perstack/perpoint
    • embelishments from styles ?

Drawers

  • transparency in all drawers (print, wmf, ...)
  • monochrome in all drawers
  • putImage in all drawers
  • extract PrepareSimplePen

Chart

  • DepthX/DepthY ...or... CameraVector
  • navigation: "axis scrollbar", CurrentExtentPen, limit navscrollbar to the extent
  • measuring units: pixels, graph, percent

Demos

  • crosshair page in tools demo
  • zerolevel (?)
  • from tutorials

Other

  • warnings (incompatible axises in group, ...)
  • more documentation
  • more tests
  • better icons
  • lazreport integration
  • more tutorials
  • wizards
  • shapes
  • LazLogger
  • better teechart compatibility

Internal

  • AddSubcomponent => SetParentComponent
  • extract TSubcomponentClassRegistry
  • LazFreeType in nogui (or even OpenGL)
  • bresenham in TesselateRadialPie
  • advanced notification