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Funnel chart with rounded corners

Demo source

<!-- Styles -->
<style>
#chartdiv {
  width: 100%;
  max-width: 500px;
  height: 500px;
}
</style>

<!-- Resources -->
<script src="https://cdn.amcharts.com/lib/5/index.js"></script>
<script src="https://cdn.amcharts.com/lib/5/percent.js"></script>
<script src="https://cdn.amcharts.com/lib/5/themes/Animated.js"></script>

<!-- Chart code -->
<script>
am5.ready(function() {

// Create root element
// https://www.amcharts.com/docs/v5/getting-started/#Root_element
var root = am5.Root.new("chartdiv");


// Set themes
// https://www.amcharts.com/docs/v5/concepts/themes/
root.setThemes([
  am5themes_Animated.new(root)
]);


// Create chart
// https://www.amcharts.com/docs/v5/charts/percent-charts/sliced-chart/
var chart = root.container.children.push(am5percent.SlicedChart.new(root, {
  layout: root.verticalLayout
}));


// Create series
// https://www.amcharts.com/docs/v5/charts/percent-charts/sliced-chart/#Series
var series = chart.series.push(am5percent.FunnelSeries.new(root, {
  alignLabels: true,
  orientation: "vertical",
  valueField: "value",
  categoryField: "category",
  bottomRatio: 1
}));

series.slices.template.setAll({
  cornerRadiusBL: 5,
  cornerRadiusBR: 5,
  cornerRadiusTL: 5,
  cornerRadiusTR: 5
})
series.links.template.setAll({
  forceHidden: true,
  height: 5
})

// Set data
// https://www.amcharts.com/docs/v5/charts/percent-charts/sliced-chart/#Setting_data
series.data.setAll([
  { value: 10, category: "One" },
  { value: 9, category: "Two" },
  { value: 6, category: "Three" },
  { value: 5, category: "Four" }
]);


// Play initial series animation
// https://www.amcharts.com/docs/v5/concepts/animations/#Animation_of_series
series.appear();


// Create legend
// https://www.amcharts.com/docs/v5/charts/percent-charts/legend-percent-series/
var legend = chart.children.push(am5.Legend.new(root, {
  centerX: am5.p50,
  x: am5.p50,
  marginTop: 15,
  marginBottom: 15
}));

legend.data.setAll(series.dataItems);


// Make stuff animate on load
// https://www.amcharts.com/docs/v5/concepts/animations/
chart.appear(1000, 100);

}); // end am5.ready()
</script>

<!-- HTML -->
<div id="chartdiv"></div>