Add first-class PowerPoint bubble charts by PrzemyslawKlys · Pull Request #2179 · EvotecIT/OfficeIMO

PrzemyslawKlys · 2026-07-25T19:12:25Z

Summary

Adds first-class PowerPoint bubble charts to the shared chart contract. Callers can create a bubble series with X, Y, and per-point size values, then add it with the existing PowerPoint chart APIs.

Bubble data survives save/reopen, UpdateData(...), accessibility summaries, and the embedded workbook. Shared PNG, SVG, HTML, PDF, and raster output preserves point colors, outline color and width, zero-sized bubbles, native bubble scale, and exact area-versus-width sizing. Numeric ticks, gridlines, labels, and bubble centers share the same radius-safe coordinate map, so large extrema stay inside the plot without drifting away from their axes.

Semantic PowerPoint HTML stores X and bubble-size metadata and restores a native bubble chart on import. Malformed semantic data and invalid, non-finite, negative, missing, or mismatched native caches fail through the safe snapshot contract instead of silently changing the chart. Enabled 3-D bubble rendering is rejected because the shared renderers provide a flat bubble-chart surface.

The shared Excel entry point rejects the bubble kind explicitly instead of creating a different chart. Excel callers can continue to use the native Excel bubble-chart API.

Usage

var data = new OfficeChartData(
    new[] { "1", "2", "3" },
    new[] {
        OfficeChartSeries.CreateBubble(
            "Portfolio",
            xValues: new[] { 1D, 2D, 3D },
            yValues: new[] { 12D, 18D, 15D },
            bubbleSizes: new[] { 9D, 36D, 16D })
    });

slide.AddChartCm(OfficeChartKind.Bubble, data, 2, 3, 20, 10);

Bubble sizes must be finite and non-negative, with one size for every X/Y point.

Validation

The complete .NET 8 suites pass for Drawing (1,001), PowerPoint (1,407), HTML (1,225), and Excel (2,657), with seven opt-in live/Desktop tests skipped. Focused bubble tests pass on .NET 10. Drawing, PowerPoint, PowerPoint PDF, and PowerPoint HTML build for .NET Standard 2.0 with zero warnings.

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chatgpt-codex-connector · 2026-07-25T20:43:54Z

                + plotArea.Elements<C.AreaChart>().Count()
                + plotArea.Elements<C.RadarChart>().Count()
                + plotArea.Elements<C.ScatterChart>().Count()
+                + plotArea.Elements<C.BubbleChart>().Count()


Reject mixed snapshots that omit bubble layers

When a native plot area contains a bubble layer plus at least two other compatible layers, this count sends it through TryCreateMixedChartSnapshot, but that method has no C.BubbleChart branch. The two other layers can therefore make parts.Count > 1 and produce a successful snapshot that silently excludes every bubble, causing shared image, HTML, and PDF exports to omit source data; explicitly reject such mixed plots or include the bubble layer in the mixed snapshot.

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chatgpt-codex-connector · 2026-07-25T20:43:54Z

+                if (series.BubbleSizes != null && i < series.BubbleSizes.Count) {
+                    body.Append(" data-officeimo-bubble-size=\"")
+                        .Append(OfficeHtmlText.EscapeAttribute(series.BubbleSizes[i].ToString("G17", CultureInfo.InvariantCulture)))
+                        .Append('"');


Preserve bubble sizing semantics in semantic HTML

For a bubble chart whose native BubbleScale is not 100 or whose SizeRepresents is Width, semantic export records only the raw per-point sizes here. On import, TryCreateBubbleChartData recreates the chart through CreateSharedBubbleChart, which always uses scale 100 and Area, so an export/import round trip materially changes bubble dimensions and proportions without an approximation diagnostic; serialize and restore both chart-level settings alongside the size values.

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chatgpt-codex-connector · 2026-07-25T20:43:54Z

+                        markerOutlineColor: item.StrokeColor ?? item.Color,
+                        markerOutlineWidth: item.StrokeWidth));


Preserve explicitly disabled bubble outlines

When an imported bubble series explicitly uses <a:noFill/> for its outline, ReadSeriesStrokeColor returns null, and this fallback substitutes the bubble fill color instead. CreateBubble and AddBubbleMarker then render a visible 1-point (or retained-width) border, so PNG, SVG, HTML, and PDF snapshots add an outline that the native chart explicitly disabled; carry a distinct no-outline state rather than treating it as a missing color.

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chatgpt-codex-connector · 2026-07-25T20:43:54Z

                if (layout.ShowMarkers && currentSeries.ShowMarkers) {
                    OfficeColor pointColor = GetPointColor(currentSeries.PointColors, points[i].SourceIndex, color);
-                    AddMarker(drawing, currentSeries, point, 5D, pointColor, 1.25D);
+                    if (currentSeries.BubbleSizes != null) {
+                        AddBubbleMarker(drawing, currentSeries, points[i].SourceIndex, point,


Render bubble glyphs independently of marker visibility

When a Bubble snapshot is rendered with OfficeChartLayout(showMarkers: false), this outer condition skips AddBubbleMarker for every point. Because bubble series have no connecting line or other data glyph, the resulting chart contains axes and possibly labels but none of its bubbles; treat bubble glyphs as the chart's data marks rather than optional scatter markers.

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chatgpt-codex-connector · 2026-07-25T20:43:54Z

+                    if (currentSeries.BubbleSizes != null) {
+                        AddBubbleMarker(drawing, currentSeries, points[i].SourceIndex, point,
+                            maximumBubbleSize, maximumBubbleDiameter,
+                            snapshot.BubbleSizeMode, pointColor);
+                    } else {
+                        AddMarker(drawing, currentSeries, point, 5D, pointColor, 1.25D);


Reject Bubble snapshots without size data

The public Drawing contract permits OfficeChartSnapshot to use OfficeChartKind.Bubble with an ordinary OfficeChartSeries whose BubbleSizes is null. For numeric categories, this fallback renders every point as a fixed-size scatter marker and reports success, even though the requested chart has no bubble-size data; validate the Bubble contract or skip/fail the malformed series instead of silently changing chart families.

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Add first-class PowerPoint bubble charts

73d4b26

chatgpt-codex-connector Bot reviewed Jul 25, 2026

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Address bubble chart review gaps

4665a48

chatgpt-codex-connector Bot reviewed Jul 25, 2026

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Preserve bubble chart rendering fidelity

6da4f7a

chatgpt-codex-connector Bot reviewed Jul 25, 2026

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Complete bubble chart fidelity handling

a11c1d9

chatgpt-codex-connector Bot reviewed Jul 25, 2026

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		markerOutlineColor: item.StrokeColor ?? item.Color,
		markerOutlineWidth: item.StrokeWidth));

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PrzemyslawKlys commented Jul 25, 2026 •

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