TAChart Roadmap

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
• update margins for axis.ZPosition
• walls
• YYYMMDD -> datetime transform(?)
• LineRange(?)
• arrows: fill color, pixel-symmetrical
• fixed size/synchronize axis size between linked charts
• "axis breaks" -- transformation?

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 (?)

Labels

• fix labels with NaNs
• margins
• more frame shapes: rounded rects, ellipses, callouts
• 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, ...)
• radial pie 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