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 Intervals.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: <s>bubble, box-and-whiskers(?), OHLC(?),</s> func
• <s>fix 3-d pie series with exploded slices</s>
• bar: <s>pyramid, code, cylinder, prism, </s>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
• <s>polar series: labels, brush, pointers</s>
• 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 (?)
• <s>range bar series</s>
• Gantt series (bar.starty, bar.startx, bar.endx)
• stacked<s>/donut</s> pie series (?)
• <s>test/fix rotated stacked series</s>
• subcharts
• GIS
• func series: discontinuity pointers
• slopegraphs, sparklines (?)
• <s>arrow series</s>
• 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
• <s>polygon series</s>

Legend

• ColumnPerGroup
• legend line per stack level
• legendpanel.autosize -> scrollable with scrollbox
• different widths for columns
• arbitrary position
• <s>support clicks on series items</s>
• support FontSeriesColor

Tools

• <s>test/fix many charts per toolset</s>
• <s>remove old reticule</s>
• xorpen/xortext in all drawers
• label editor/notes
• <s>axis tools</s>
• <s>legend click tool</s>
• <s>title/footer click tool</s>

Optimization

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

Sources

• OO (incompatible?)
• YList in Marks.Format
• calculated sources: optimization, sliding median, user-defined filter
• derivative: <s>Savitzky-Golay</s>, non-equidistant X
• bug: db-source does not auto-refresh after dataset changes (?)
• <s>support NaN in all series: func, ...</s>
• 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 (?)
• <s>from tutorials</s>

Other

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

Internal

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

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From the Free Pascal wiki, page "TAChart Roadmap", as it stood on 2021-10-24 after a change by Wp, out of the wiki's dump of 2024-05-26. Copyright stays with the author who wrote it, according to the old wiki's Licensing page. If you have concerns about this material, message the admin.