Pure C++20 plotting API with a gnuplot renderer for figures.

• Palette/color-cycle API (Default, Tab10, Viridis, Grayscale)
• Confidence bands (add_band)
• Histogram and heatmap helpers (add_histogram, add_heatmap)
• Rich legend controls (position, columns, box, opacity, font)
• Tick/format controls (major step, minor count, format strings)
• Text mode selection (Enhanced, Plain, LaTeX toggle)
• Style profiles (Science, IEEE_Strict, AIAA_Strict, Presentation, DarkPrintSafe)
• Typed annotations/objects (labels, arrows, rectangles)
• Reproducibility manifest export (manifest.json)

• CMake >= 3.20
• C++20 compiler
• gnuplot (required for final figure generation)

Install gnuplot:

# macOS
brew install gnuplot

# Ubuntu/Debian
sudo apt-get update && sudo apt-get install -y gnuplot

# Fedora
sudo dnf install -y gnuplot

cmake --preset dev-debug
cmake --build --preset build-debug
ctest --preset test-debug

flowchart LR
  A[FigureSpec / AxesSpec / SeriesSpec] --> B[Figure / Axes]
  B --> C[IPlotBackend]
  C --> D[GnuplotBackend]
  D --> E[tmp/*.dat]
  D --> F[tmp/figure.gp]
  D --> G[figure.pdf / figure.svg / figure.eps]

1. Configure a publication preset (IEEE_SingleColumn, IEEE_DoubleColumn, AIAA_Column, AIAA_Page).
2. Set output formats to vector (Pdf, Svg, optional Eps).
3. Render via GnuplotBackend from your C++ executable.
4. Use PDF as primary submission asset.

• Cairo terminals with enhanced text
• Explicit line widths and rounded joins
• Tick formatting and outward tics
• Grid styling suitable for print
• Escaped plot labels/titles for robust script generation

When using IEEE_SingleColumn or IEEE_DoubleColumn, renderer behavior is tightened to print-safe defaults:

• 8.5 pt Times-style text defaults
• monochrome plotting by default (set monochrome)
• dashed line-style differentiation per series (dt 1..N)
• per-series color/opacity overrides disable global monochrome automatically
• SciencePlots-like axis defaults: visible minor ticks, thin 0.5 axis/grid strokes
• vector-first outputs (PDF, SVG, EPS)

./build/dev-debug/two_window_example --out out/two_window
./build/dev-debug/layout_2x2_example --out out/layout_2x2
./build/dev-debug/three_line_ieee_example --out out/three_line_ieee
./build/dev-debug/monte_carlo_alpha_example --out out/monte_carlo_alpha
./build/dev-debug/feature_rich_showcase --out out/feature_rich_showcase

Generated from:

./build/dev-debug/three_line_ieee_example --out out/three_line_ieee_readme

Expected outputs:

• out/<name>/figures/figure.pdf
• out/<name>/figures/figure.svg
• out/<name>/figures/figure.eps
• out/<name>/figures/tmp/figure.gp
• out/<name>/figures/tmp/ax*_series*.dat

Detailed controls and recipes: Plot Controls

RenderResult.status values:

• Success
• InvalidInput
• IoError
• ExternalToolMissing
• ExternalToolFailure
• UnsupportedFormat