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TODO.md

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The list below represents a combination of high-priority work, nice-to-have features, and random ideas. We make no guarantees that all of this work will be completed or even started. If you see something that you need or would like to have, let us know, or better yet consider submitting a PR for the feature.

API

Axes

  • add flag to remove weekends on Time axis
  • pixel space scale (ImPlotTransform_Display), normalized space scale (ImPlotTransform_Axes), data space scale (ImPlotTransform_Data)
  • make ImPlotFlags_Equal not a flag -> SetupEqual(ImPlotAxis x, ImPlotAxis y)
  • allow inverted arguments SetAxes to transpose data?
  • SetupAxisColors()
  • SetupAxisHome()

Plot Items

  • add PlotBubbles (see MATLAB bubble chart)
  • add non-zero references for PlotBars etc.
  • fix appearance of PlotBars spacing

Styling

  • support gradient and/or colormap sampled fills (e.g. ImPlotFillStyle_)
  • API for setting different fonts for plot elements

Colormaps

  • gradient editing tool
  • RemoveColormap
  • enum ImPlotColorRule_ { Solid, Faded, XValue, YValue, ZValue }

Legend

  • improve legend icons (e.g. adopt markers, gradients, etc)
  • generalize legend rendering for plots and subplots
  • add draggable scroll bar if users need it

Tools / Misc.

  • add IsPlotChanging to detect change in limits
  • add ability to extend plot/axis context menus
  • add LTTB downsampling for lines
  • add box selection to axes
  • first frame render delay might fix "fit pop" effect
  • move some code to new implot_tools.cpp
  • ColormapSlider (see metrics)
  • FillAlpha should not affect markers?
  • fix mouse text for time axes

Optimizations

  • find faster way to buffer data into ImDrawList (very slow)
  • reduce number of calls to PushClipRect
  • explore SIMD operations for high density plot items

Plotter Pipeline

Ideally every PlotX function should use our faster rendering pipeline when it is applicable.

User Data > Getter > Fitter > Renderer > RenderPrimitives

Plotter Getter Fitter Renderer RenderPrimitives
PlotLine Yes Yes Yes Yes
PlotScatter Yes Yes Yes Yes
PlotStairs Yes Yes Yes Yes
PlotShaded Yes Yes Yes Yes
PlotBars Yes Yes Yes Yes
PlotBarGroups : : : :
PlotHistogram : : : :
PlotErrorBars Yes Yes No No
PlotStems Yes Yes Yes Yes
PlotInfLines Yes Yes Yes Yes
PlotPieChart No No No No
PlotHeatmap Yes No Yes Mixed
PlotHistogram2D : : : :
PlotDigital Yes No No No
PlotImage - - - -
PlotText - - - -
PlotDummy - - - -

Completed

  • add exploding to PlotPieChart (on legend hover)
  • make BeginPlot take fewer args:
  • make query a tool -> DragRect
  • rework DragLine/Point to use ButtonBehavior
  • add support for multiple x-axes and don't limit count to 3
  • make axis side configurable (top/left, right/bottom) via new flag ImPlotAxisFlags_Opposite
  • add support for setting tick label strings via callback
  • give each axis an ID, remove ad-hoc DND solution
  • allow axis to be drag to opposite side (ala ImGui Table headers)
  • legend items can be hovered even if plot is not
  • fix frame delay on DragX tools
  • remove tag from drag line/point -> add Tag tool
  • add shortcut/legacy overloads for BeginPlot
  • SetupAxisConstraints()
  • SetupAxisScale()
  • add ImPlotLineFlags, ImPlotBarsFlags, etc. for each plot type
  • add PlotBarGroups wrapper that makes rendering groups of bars easier, with stacked bar support
  • PlotBars restore outlines
  • add hover/active color for plot axes
  • make legend frame use ButtonBehavior
  • ImPlotLegendFlags_Scroll (default behavior)