swm_chart 0.16.0

Stock World Monitor Charts: high-performance financial charts for Flutter, a native Dart port of TradingView Lightweight Charts.

0.16.0

• DrawingLabels: the words drawings write on the chart — a position's target, stop, long / short, quantity and risk / reward, "bars" after a bar count and the units of a duration. Set DrawingLabels.current to your app's language.
• Breaking: barsLabel of DateRangeDrawing, MeasureDrawing and InfoLineDrawing is now String? (null follows DrawingLabels.current). DrawingCodec saves it only when set, and reads the "bars" 0.15.0 saved with every drawing back as null.

0.15.0

• ProChartStrings: every label, tooltip and message of SwmProChart, its sheets and dialogs, English by default — pass your app's words to SwmProChart.strings or a ProChartStringsScope. Function fields name the catalog's indicators, groups and inputs, the drawing tools, line styles and chart types; the indicator search matches translated names.
• IndicatorCatalog.register / unregister: an app's own indicators in the picker (new IndicatorGroup.custom), added, set and saved like the built-in ones; IndicatorCatalog.available and registered.
• ProChartController.drawingKinds and SwmProChart.toolGroups: your own drawing tools on the toolbar, saved, restored and duplicated.
• Display settings: crosshairStyle, crosshairColor, crosshairWidth, showGrid, showWatermark and resetDisplay on the controller, a Chart display sheet (showChartDisplaySheet, ChartDisplaySettings) in the settings menu, and a display part in saveState. Changing them keeps the price scale's mode.
• Fourteen more drawing tools, saved and restored by DrawingCodec: TrendAngleDrawing, InfoLineDrawing, RangeVolumeProfileDrawing (fixed range or anchored), HarmonicDrawing (XABCD, Cypher), HeadAndShouldersDrawing, SineLineDrawing, CyclicLinesDrawing, TimeCyclesDrawing, FibFanDrawing, FibArcDrawing, IconMarkDrawing (flags and emoji, saved by key through DrawingCodec.icons) and PriceLabelDrawing.
• DrawingTools.groups: 51 tools in seven groups — lines, channels and pitchforks, Fibonacci and Gann, patterns and cycles (ABCD, triangle, three drives and the Elliott waves too), forecasting and measuring (volume profiles too), shapes (highlighter too) and annotations (price label, flag, emoji too).
• SwmProChart.toolbarMode: the drawing toolbar docked down the left (as before), or DrawingToolbarMode.floating — behind a pencil button over the chart, which keeps the full width. New string ProChartStrings.drawingTools.

0.14.0

• SwmProChart: a ready-made trading screen around a ProChartController — a top bar (symbol, interval, chart type, indicator picker, undo / redo, log / percent scale, volume), a drawing toolbar with the tools in groups (magnet, keep drawing, hide / remove all) and a style bar for the selected drawing (color, width, line style, text, lock, duplicate, delete). The parts are public widgets: ProChartTopBar, DrawingToolbar, DrawingStyleBar, IndicatorPicker / showIndicatorSheet, showIndicatorSettings.
• ProChartController: the price series in seven styles (candles, hollow candles, bars, line, area, baseline, Heikin-Ashi), volume, indicators, drawings, trading lines and a legend; saveState / restoreState the whole chart as JSON, saveIndicators / restoreIndicators templates.
• IndicatorCatalog: all 73 indicators by id, with their inputs (IndicatorSpec, IndicatorParam) and groups — for pickers, settings and saved charts.
• New drawings: PositionDrawing (long / short with target, stop, R:R and amounts), FibExtensionDrawing, FibTimeZoneDrawing, PitchforkDrawing (Andrews, Schiff, modified Schiff), GannFanDrawing, AnchoredVwapDrawing (with bands), RegressionTrendDrawing, CalloutDrawing, DateRangeDrawing, PriceRangeDrawing; all saved by DrawingCodec (source / volume for those that read the data).
• DrawingEditor.update (a change as one undo step) and duplicate; Drawing.completed and selectedAxisPrices; DrawingContext.timeOf.
• Example: a Pro tab with SwmProChart, live ticks, intervals and save / restore; screenshots of it.

0.13.1

• CrosshairSync across intervals: a time between the other chart's bars (02:00 on a 4h chart) now lands on the bar holding it; before, that chart's crosshair didn't move.
• Tooltip legend: the box stays inside the pane when it fits on neither side of the crosshair.
• Example: Pro tools adds Trend (Supertrend, HMA, ADX, Stoch RSI with a tooltip), Analysis (ZigZag, Elliott count, auto trendlines, support / resistance, candlestick patterns), Sessions (session volume profiles), Forecast (fan) and Sync (1h / 4h charts) — with screenshots.
• README: reorganized — captioned gallery, contents, installation, quick start, then the guide by topic.

0.13.0

• 47 more chart indicators — 73 built in — each one line to add, each over a new Ta function:
  • Moving averages: Hma, Dema, Tema, Rma, Vwma, Alma, Lsma, Zlema, T3, McGinley, Envelope, Alligator, ChandelierExit.
  • Oscillators: StochRsi, Trix, UltimateOscillator, AwesomeOscillator, AcceleratorOscillator, Ppo, Dpo, Momentum, Cmo, Tsi, Coppock, Kst, FisherTransform, ConnorsRsi, Rvi, Smi, Choppiness, Vortex, ElderRay, BalanceOfPower, MassIndex.
  • Volume: AccumulationDistribution, ChaikinOscillator, PriceVolumeTrend, VolumeIndexes (NVI / PVI), Klinger, ForceIndex, EaseOfMovement, VolumeOscillator.
  • Volatility: StandardDeviation, HistoricalVolatility, BollingerPercentB, BollingerWidth, UlcerIndex.
• Ta: the functions above, plus Ta.trueRange, Ta.wma, Ta.rma, Ta.fractals (Williams fractals) and Ta.opens. Multi-line results are records, e.g. Ta.stochRsi(bars).k.

0.12.0

• Value area: VolumeProfileResult.valueAreaLow / valueAreaHigh (VAL / VAH), the range around the point of control holding 70% of the volume, and Ta.valueArea to compute it for any profile.
• Ta.sessionVolumeProfiles: a volume profile per session — by default each calendar day of intraday bars, or any key via sessionOf.
• VolumeProfileOptions.valueArea: marks the value area — bins outside it dimmed (outsideOpacity), VAH and VAL as dashed lines (valueAreaLineColor).
• SessionVolumeProfilePrimitive: each session's profile drawn over its own bars, growing right from the session's first bar, with its point of control and value area.

0.11.0

• Faster crosshair and animations: the chart paints in two layers. The content (grid, series, axes) sits in its own repaint boundary; the overlay (crosshair and its axis labels, legend, trading lines, drawings, the last price pulse) paints over it. A crosshair move or a pulse frame repaints only the overlay — no layout, no series. About 3× less paint work per crosshair move on 5,000 bars with 6 lines. ChartModel.overlay notifies overlay-only changes.
• FanPrimitive: a forecast fan (cone) — nested ranges (e.g. 80% and 95%) and a center line drawn forward from a bar into the future, on logical indices past the last bar. Takes part in autoscale; smooth or straight edges.
• DrawingCodec: save drawings as JSON-ready maps and load them back, with anchors stored by time (they don't shift when history is paged in). All built-in drawings are known; DrawingKind adds custom ones.
• DrawingEditor: undo / redo (undo, redo, canUndo, canRedo, onHistoryChanged, checkpoint for changes made outside the editor) over creating, moving, reshaping, removing and clearing.
• Drawing.pricesAt(logical) and DrawingEditor.pricesAt(time): a drawing's line prices at a bar — trend line, horizontal line, channel rails, rectangle — for alerts.
• CrosshairSync: keeps the crosshair of several charts on the same time.
• TimeScaleApi.timeToLogical / logicalToTime (and logicalOfTime / timeOfLogical): fractional logical index ↔ time, interpolated between bars and extrapolated past them.
• Drawing.kind: the name a drawing is saved under.

0.10.1

• Ta.volumeProfile: each VolumeBucket has upVolume, the part traded on up bars, to colour the profile by buyers and sellers (VolumeProfileBin.upVolume).

0.10.0

• 16 more chart indicators: WilliamsR, Adx (+DI / −DI), Obv, Cci, Mfi, Cmf, Aroon, Roc, ParabolicSar, Kama, Keltner, Donchian, Supertrend, VolumeSma, SineWave, EvenBetterSinewave (26 in all). Built on TaIndicator: recomputed over the series on each update.
• Ta: technical analysis as plain functions over OHLCV bars (TaBar, implement it on your own bar type, or use TaPoint) — every indicator above plus the analysis tools: ZigZag, automatic Elliott wave counts, support / resistance, chart patterns (head & shoulders, double tops, triangles, wedges, flags, cup & handle…), candlestick patterns, automatic trendlines, RSI divergences, Fibonacci levels, pivot points, regression channel and volume profile. Moved from Stock World Monitor, so the app, its screener, alerts and backtests use the same math.

0.9.0

• Indicators: Sma, Ema, Wma, Bollinger, Rsi, Macd, Stochastic, Atr, Vwap, Ichimoku, added with chart.addIndicator(indicator, source:). Incremental on ticks and new bars; oscillators get their own pane with levels.
• TradingLines: draggable orders, take profit / stop loss, positions with P&L, and price alerts (crossing / up / down) with onAlert.
• createLegend: legend rows or a tooltip following the crosshair.
• Chart types and timeframes: heikinAshi / HeikinAshi, renko, lineBreak, rangeBars, resample / resampleSum / Resampler (Timeframe minutes … months).
• chart.addComparison: compare symbols on a percentage scale.
• PrimitiveContext.crosshairIndex / crosshairPosition.
• Example: Pro tools tab with all of the above; new screenshots.

0.8.1

• Screenshots of the drawing tools, overlays, sparklines and donut.
• Example: Tools tab (drawings / overlays) and Watchlist tab.

0.8.0

• SwmDonut: a donut (ring) chart for shares of a whole. Slices clockwise from 12 o'clock with a gap between them; touch to select one (reported through onSelect, drawn thicker), any widget in the hole. SwmDonut.sliceAt hit-tests a point; SwmDonutPainter paints one onto any canvas.

0.7.0

• SwmSparkline: a small, non-interactive line for list rows, cards and tiles — one CustomPainter, no axes or gestures, so a list of dozens stays light. Green / red by direction (or against a baseline, drawn dashed), optional gradient area, curved line and last-point dot. SwmSparklinePainter paints one onto any canvas (e.g. into an image).

0.6.1

• Touch: with the crosshair shown (after a tap or a long press), a one-finger drag moves it across the bars instead of scrolling, like TradingView's mobile app; a tap hides it and drags scroll again. Pointer handlers (drawing tools) still get the drag first.

0.6.0

• Drawing tools (DrawingEditor, DrawingsPrimitive, Drawing): trend lines, rays and arrows, horizontal / vertical / cross lines, rectangles, ellipses, parallel channels, Fibonacci retracements, text, price & date measurements, labelled multi-point paths (Elliott, XABCD) and freehand. Create by taps or a drag, select, move, reshape by handles, delete; snap hook for magnets; extend Drawing for custom tools.
• Overlays: BandFillPrimitive, PriceLevelsPrimitive, VolumeProfilePrimitive.
• Pointer capture: ChartController.subscribePointer / ChartPointerEvent lets a handler take a drag or long press in a pane instead of the chart.
• TrackingModeOptions.longPressCrosshair to hand long presses to pointer handlers.
• PaneApi.priceToCoordinate / coordinateToPrice; ChartEventParams.price.

0.5.1

• Screenshots on pub.dev and in the README (tool/screenshots.sh).
• Example: yield curve with fixed edges so the axis end labels stay inside.

0.5.0

• Desktop / web: the crosshair follows the mouse and hides when it leaves; mouse clicks no longer toggle it. Cursors like upstream: resizeRow on separators, resizeUpDown on price axes, resizeLeftRight on the time axis; primitives and custom series can set cursor from hitTest. Separators highlight on hover. Long-press is touch-only.
• alignLabels is a port of upstream's overlap algorithm (verified against it on 300 random label sets).
• Time axis labels are clipped like upstream, and only aligned inside the axis at fixed edges (needAlignCoordinate).
• Last price animation reproduces upstream's three stages.
• PriceScaleOptions.textColor.
• Price axes can't be drag-scaled in percentage / indexed-to-100 modes, like upstream.
• Accessibility: SwmChart.semanticsLabel and a last-values summary.
• CI and tag-based publishing workflows.

0.4.1

• Homepage: https://stockworldmonitor.com/
• Example: "SWM Chart" watermark.

0.4.0

• Renamed to Stock World Monitor Charts (package name stays swm_chart).

• Conflation now matches upstream's DataConflater: pairwise power-of-two levels with incremental updates, custom series conflationReducer, per-series conflationThresholdFactor, precomputeConflationOnInit and precomputeConflationPriority.

• hoveredInfo matches upstream: type, sourceKind, objectKind (incl. seriesMarker, customObject); primitive itemType and hitTestPriority; custom series hitTest.

• New bars no longer rebuild all time scale tick marks (only the tail, with identical results): realtime p99 frame build 6-14 ms -> ~2 ms.

• Performance: candles, bars and histograms are drawn in one vertex batch; autoscale uses a chunked min/max cache; prices and indices are converted with precomputed linear transforms; new bars are appended in place. Zooming out to 100k candles without conflation went from ~1.3 s to ~12 ms of raster time per frame (macOS, profile). Rendering is pixel-identical.

• Touch pans lock to their dominant direction, so horizontal swipes no longer drift a manual price scale.

• The TradingView attribution logo is now opt-in (layout.attributionLogo).

• Example: macOS target and a frame-timing benchmark (example/integration_test/perf_test.dart).

0.3.0

• Yield curve (ChartController.yieldCurve) and options (ChartController.options) charts; SeriesData.time is now num.
• Whitespace data, custom series, conflation, up/down markers plugin.
• Hit testing (hoveredSeries, hoveredObjectId), hoveredSeriesOnTop.
• All remaining upstream options: time scale (rightOffsetPixels, lockVisibleTimeRangeOnResize, uniformDistribution, ignoreWhitespaceIndices, ...), price scale (ticksVisible, ensureEdgeTickMarksVisible, overlayPriceScales), localization (dateFormat, locale, formatters), handleScroll/handleScale/ kineticScroll/trackingMode, background gradient, attribution logo, addDefaultPane, defaultVisiblePriceScaleId.
• API: pop, priceFormatter, lastValueData, seriesOrder, subscribeDataChanged, dataByIndex mismatch direction, paneSize, timeToIndex, pane.addSeries.
• fitContent() before the first layout is applied once laid out.

0.2.0

• Multiple panes with draggable separators; pane API (add/remove/swap/move, height, stretch factor).
• Area, Bar and Baseline series; curved line type.
• Left price scale; logarithmic, percentage and indexed-to-100 modes.
• Custom price lines, price line source, base line, last price animation.
• Primitives (plugin) API, series markers, text and image watermarks.
• autoscaleInfoProvider, setCrosshairPosition, takeScreenshot, barsInLogicalRange, double-click, size and visible time range events.

0.1.0

• MVP port of TradingView Lightweight Charts v5.2.1: candlestick, line and histogram series, overlay price scales, time/price scale, crosshair, touch gestures, realtime updates and events.