Summary

• Adds the effectScatter series — scatter points that pulse with a configurable ripple animation. Most common use: highlight hotspots on a map or any 2D plot.
• Mirrors the existing Scatter structure (same CartesianCoordChart base, same coordinate-system mixins: cartesian / polar / geo / calendar / single).
• Adds the chart-specific extras: RippleEffect (period, scale, brushType, color, number), plus showEffectOn ("render" / "emphasis") and effectType on the series.

Public API added

• EffectScatter
• charts.effectScatter.EffectScatterSeries, EffectScatterDataItem, EffectScatterEmphasis, RippleEffect
• origin.chart.effectScatter.EffectScatterSeriesOption, EffectScatterStateOption, EffectScatterEmphasisOption, EffectScatterDataItemOption, RippleEffectOption

How to use

EffectScatter chart = new EffectScatter()
    .setTitle("Active hotspots")
    .addXAxis().addYAxis()
    .addSeries(new EffectScatterSeries()
        .setSymbolSize(20)
        .setShowEffectOn("render")
        .setRippleEffect(new RippleEffect().setScale(2.5).setBrushType("stroke"))
        .setData(new Number[][] { {10, 80}, {20, 50}, {30, 70}, {40, 30}, {50, 90} }));

String json = new EChartsSerializer().toJson(chart.getOption());

For a richer example with named data items, tooltip, and dark background, see src/test/java/org/icepear/echarts/demo/EffectScatterDemo.java — run mvn test -Dtest=EffectScatterDemo then open /tmp/effect-scatter-demo.html.

Tests added (22 new, all passing locally)

• simple/effectScatter/BasicEffectScatterTest — snapshot test
• charts/effectScatter/EffectScatterSeriesTest — 18 unit tests covering every setter overload (symbolSize/symbolOffset Number/String, all data-shape overloads), ripple nesting, null-omission semantics, axis-index/coord-system fields, emphasis flags
• render/simple/RenderEffectScatterByChartTest — Engine smoke test (json + html paths)
• demo/EffectScatterDemo — opt-in HTML writer for visual inspection

Test plan

• mvn test -Dtest=BasicEffectScatterTest — 1/1 pass
• mvn test -Dtest=EffectScatterSeriesTest — 18/18 pass
• mvn test -Dtest=RenderEffectScatterByChartTest — 2/2 pass
• mvn test -Dtest=EffectScatterDemo then open /tmp/effect-scatter-demo.html — pulses render correctly in browser
• mvn test (full suite) — all 21 new default-suite tests pass; only the 3 pre-existing polar/float-precision failures remain on master