Background Width Not Truncated with oversizedBehavior

[sivaramakrishnan-stratforge]

Hi amCharts team,

I've encountered an issue when using oversizedBehavior: "truncate" together with a background on axis labels.

When the chart is scrolled to display a large number of bars, the label background expands to its full width instead of remaining constrained to the truncated text.

In the example below, if you increase the scrollbar range to display more bars, you'll notice that the label backgrounds stretch to their full width even though the label text is truncated.

Is this expected behavior, or could this be a bug? If it's expected, is there any workaround or recommended solution to keep the label background constrained to the truncated text?

https://codepen.io/srkrishnan/pen/wBgmOqK?editors=0010

[martynasma]

We're fixing it in the next version. Thanks for the heads up!

[martynasma]

Fixed in 5.20.0.

[5.20.0] - 2026-07-22

Added

• New StarPattern and TrianglePattern fill patterns added. More info
• RectanglePattern now supports a rotateShapes setting. When true, rotation rotates each rectangle around its own center instead of the whole grid which makes it faster.
• New themes: Midnight, Ember, Nord, NordDark, Pastel, PastelDark, Colorblind, ColorblindDark (Okabe-Ito, color-blindness safe), Patterns, PatternsDark, Petroleum, Savanna.
• New dark variants of the existing themes: DatavizDark, KellyDark, MaterialDark, MoonriseDark, SpiritedDark, FrozenDark.
• Two new parameterized themes : Monochrome (a single-hue lightness ramp with an optional accent) and Adaptive (generates a full palette from one or two base colors). More info
• XYChart has new strokeWidths and strokeDasharrays settings — arrays cycled across line series as they are added, the same way colors cycles series colors.
• XYCursor has a new clickTolerance setting: how far outside the plot area (in pixels) a press can start and still begin a zoom/selection (the selection still starts on the plot edge). Default: 0 (current behavior).
• New globalpointerdown event on all elements, fired on a press anywhere on the chart surface (mirrors globalpointermove/globalpointerup).

Changed

• The Volume Profile indicator now distributes each bar's volume across the full high/low price range it traded, instead of placing the whole bar at its closing price.
• Label's oversizedBehavior: "truncate" now ignores maxHeight setting (because there's no way to truncate text vertically).
• Stock chart indicators now enforce sensible min/max limits on their numeric settings, so extreme values can no longer freeze the page (e.g. a Volume Profile row count of 24000) or break an indicator. IIndicatorEditableSetting gains maxValue and step.
• New properties on Indicator editable settings: scale, maxValue, step. More info
• Acceleration Bands' factor now displays as the conventional 1 instead of 0.001.
• If a bullet's Graphics has no paint settings set (fill, fillGradient, fillPattern, stroke, strokeGradient) it will inherit all those from parent series.
• New Series settings: fillGradient/strokeGradient.
• PathPattern now repeats the svgPath on as a grid instead of drawing once and letting rendering engine repeat it.
• An XYSeries value field (e.g. valueYField, openValueYField) can now be changed dynamically after the series is created; re-set the series' data afterwards for the change to take effect.
• A Container's Rectangle/RoundedRectangle background now defaults crisp to true (for sharper edges/strokes) unless crisp is set explicitly.
• An XYSeries can now be reassigned to a different xAxis/yAxis after creation.
• Accessibility: Focusable elements are not being sized on initial load until they are actually focused.
• Accessibility: The <div> that holds chart's focusable elements will now have its aria-label set if ariaLabel is provided in Root settings.

Fixed

• Logarithmic ValueAxis could show floating-point noise in its grid labels (e.g. 4,999.999999999999 instead of 5,000). Grid values are now rounded.
• Logarithmic ValueAxis was showing 0 for grid values smaller than 0.00001 when no numberFormat was set
• ValueAxis with syncWithAxis and autoZoom: false regressed in 5.19.0: wrong scale and a possible browser hang.
• Acceleration Bands: the upper and lower bands were swapped to display appropriate upperColor/lowerColor.
• Williams %R: used a period + 1 lookback and treated a missing high/low as 0; it now uses exactly period bars.
• Momentum: skipped its first computable value; it now plots from period bars onward.
• Relative Strength Index: returned 0 (maximum "oversold") for a perfectly flat market (0/0); it now returns a neutral 50.
• Moving Average Cross: default fast/slow periods were inverted; the defaults are now fastPeriod: 9 / period: 21.
• Volume Profile: no longer errors in ticks count mode when the visible price range is flat.
• LinePattern with a non-zero angle could show a seam instead of tiling seamlessly.
• LinePattern with a non-zero rotation could render broken/dashed lines after the tile-size optimization; the auto-shrink is now skipped when rotation is set.
• RectanglePattern/CirclePattern with a non-zero rotation could render nothing on larger pattern tiles.
• ChartSerializer now accounts for settings on start/end labels of a HeatLegend.
• Width of the Label's underline could fluctuate in some cases.
• A non-finite startAngle/endAngle on a RadarChart (e.g. NaN or Infinity) could freeze the browser.
• Venn was not resetting its colors/patterns sets when data was cleared/re-set.
• Classes that would not react/redraw to dynamic changes to some of their settings: CategoryAxis, DateAxis, ValueAxis, CategoryDateAxis, DurationAxis, XYSeries, ColumnSeries, StepLineSeries, RadarLineSeries, SmoothedRadarLineSeries, Treemap, VoronoiTreemap, Sunburst, Pack, ForceDirected, FunnelSlice, FunnelSeries, PyramidSeries, SerpentineChart, SpiralChart, Graphics, Rectangle, RoundedRectangle, HeatLegend, WordCloud, Flow, FlowLink, Chord, ChordDirected, ChordNonRibbon, ArcDiagram.

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