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CHANGELOG

v2.3.0 (unreleased)

  • feat(picture): add automatic tmux passthrough wrapping for Kitty graphics. Added NTCHARTS_TMUX_PASSTHROUGH and NTCHARTS_KITTY environment variables for easy runtime overrides.
  • feat(kitty): add kitty-probe test program
  • feat(ci): Restructure go.mod into subdirectories, to shield users from unnecessary dependencies.
  • feat(picture): Add picture/decoders package for automatic registration of Image decoders like PNG. Previously, picture would pulled these in automatically, even if one didn't need it. BREAKING

v2.2.0 (2026-05-28)

  • feat(picture): detect Kitty graphics support and gate Toggle on capability. In other words, don't blast the terminal with characters when it doesn't support Kitty graphics. QueryKittySupport gates the probe based on environment variables; ForceKittyCapability can override detection.
  • feat(picture): add GridImage for composing logical-cell boards and sprites into a single image for grid-aligned Kitty UIs. The config uses explicit logical-grid and terminal-cells-per-cell fields, defaults to nearest-neighbor scaling for crisp board/tile sprites, and includes a full-board DrawOverlay helper for grid lines and effects.
  • feat(picture): add FitAnchor (AnchorCenter, AnchorTop, AnchorBottom, AnchorLeft, AnchorRight) for FitCover cropping. Config.Anchor and Model.Anchor() / Model.SetAnchor() let callers preserve a specific edge when cover-scaling overflows; the zero value remains AnchorCenter, matching previous center-crop behavior. chartpicture, heatpicture, and pictureurl forward the same anchor config/accessors for API parity.
  • feat(picture): add KittyResolutionFactor to scale encoded Kitty image resolution, saving rendering bandwidth and CPU.
  • feat(yomamma): add Mother's Day example app.
  • feat(wasm): add cooperative yielding (yieldToJS) during heavy rendering, and enhance web demo UI and builder.
  • fix(examples): enable AltScreen in full-screen views to restore terminal state on exit.
  • fix(kitty): improve rendering robustness under Kitty graphics (geometry-based staleness, deferred commits, capability timeouts).
  • Various bug fixes and performance improvements.

v2.1.0 (2026-05-01)

  • BREAKING (visual only): picture.Model in Kitty mode now defaults to FitContain (preserve aspect ratio, letterbox) instead of stretching to fill the cell rectangle. Glyph and Kitty paths now produce identical aspect ratio. Restore previous Kitty behavior with picture.Config{Fit: picture.FitFill}.
  • feat(picture): add FitMode (FitContain, FitFill, FitCover), Config.Fit, Model.Fit(), Model.SetFit(). Both render paths flow through a shared prepareSource helper so fit semantics are applied identically in Glyph and Kitty modes. chartpicture, heatpicture, and pictureurl add the same Config.Fit field and Fit() / SetFit() forwarders for API parity.
  • fix(picture): Glyph mode uses ansimage's ScaleModeResize (rather than ScaleModeFit) so terminals reporting non-1:2 cell pixel ratios (line-spacing, retina cells) no longer cause Glyph to letterbox while Kitty fills. prepareSource already applies the chosen FitMode, so the half-block grid just renders the prepared bitmap at exactly (cols, rows*2).
  • feat(examples/picture): f key cycles fit modes (Contain → Fill → Cover) on both panes; footer shows the current fit.
  • Replace github.com/eliukblau/pixterm => github.com/NimbleMarkets/pixterm until bugfixes are upstreamed
  • fix(kitty): geometry-change renders now delete the previous placement before re-transmitting, fixing stuck-at-old-geometry behavior in Ghostty (and other terminals where TransmitAndPut at new c/r doesn't relocate an already-on-screen virtual placement)
  • Add web-based demos using go-booba
  • feat(picture): add Config.CellPixelWidth / CellPixelHeight, Model.SetCellPixelSize / CellPixelSize, and Model.Init /
    RequestCellSize
  • fix(canvas,picture): clamp negative dims to 0 in canvas.Model.Resize,
    picture.Model.SetSize, and chartpicture.Model.SetSize
  • feat: add picture/heatpicture — continuous-field heatmap rendered through picture.Model. Sampler-driven (func(x, y float64) float64); Kitty mode samples at full terminal-pixel resolution for smooth gradients, Glyph mode samples at half-block resolution for fast fallback. Includes a render throttle (one in-flight at a time, with dirty-flush follow-up) and a runtime SamplingFactor knob to trade quality for animation smoothness on large terminals. New examples/heatpicture/perlin demo.

v2.0.3 (2026-04-28)

chartpicture is experimental. It renders charts as images; it can also bridge Apache ECharts. It is not very useful unless your terminal supports the Kitty Graphics Protocol. We are exploring how to improve it, but wanted to share with the community.

  • feat: add picture/chartpicture package — renders github.com/go-analyze/charts chart images via the embedded picture.Model
    • chartpicture.Model produces chart frames asynchronously through tea.Cmd
    • Recipes for common sources: WithLineRecipe, WithBarRecipe, WithEChartsJSONRecipe, WithPainterFuncRecipe
    • Configurable via WithChartSource, WithRecipe, WithKittyID, WithBackground, WithTheme
    • Bridges barchart.Model and linechart.Model directly via the new barchart.Model.Data() accessor
  • fix: propagate streamlinechart height fix to wave/timeserieslinechart (#7)
  • Correctness and security fixes

v2.0.2 (2026-04-27)

  • feat: add picture and pictureurl
  • feat: add controls to prevent intentional or accidental memory bombs (#12 #17)
    • add DefaultMaxPoints global and config.MaxInterpolationPoints
    • add GetLinePointsWithLimit and GetCirclePointsWithLimit
  • chore: update Golang dependencies

v2.0.1 (2026-04-13)

  • feat: Support millisecond resolution in timeseries line chart (#15)
  • fix: linechart label glitch (#16)
  • ci: Update GitHub Action versions and add test phase

v2.0.0 (2026-02-28)

  • Upgrade to BubbleTea v2.0.0 -- official release! 🎉

v2.0.0-beta.6 (2026-01-10)

  • Fix incorrect height in streamlinechart (#7)

This was teased out by adding better test scaffolding and then asking an LLM for help.

v2.0.0-beta.5 (2026-01-08)

  • Upgrade to BubbleTea v2. This lives in the v2 branches.
  • Thanks to @kpumuk for this contribution.

NOTE: The v2 designation is for BubbleTea API compatibility. The ntcharts API is still subject to change, as indicated by beta.

v0.4.0 (2026-01-08)

v0.3.1 (2024-12-17)

  • Sanitize AoC example

v0.3.0 (2024-12-14)

Initial Heatmap support is here! 🎉 It is still missing axis labels and better UX. We are still exploring the API. Please provide feedback on GitHub.

  • ADD: Initial heatmap support (#2)
  • FIX: canvas.SetRune did not honor Canvas' default style.
  • ADD: canvas.SetRuneWithStyle and canvas.GetCellStyle

v0.2.0 (2024-11-15)

v0.1.2 (2024-03-28)

  • Fix pkgsite documentation and badges.

v0.1.0 (2024-03-28)

  • Welcome to the world ntcharts! 🎉