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Two Linked Pie Charts with a Legend

Demo source

<!-- Styles -->
<style>
#chartdiv {
  width: 100%;
  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)
]);

root.container.set("layout", root.verticalLayout);

// Create container to hold charts
var chartContainer = root.container.children.push(am5.Container.new(root, {
  layout: root.horizontalLayout,
  width: am5.p100,
  height: am5.p100
}));

// Create the 1st chart
// https://www.amcharts.com/docs/v5/charts/percent-charts/pie-chart/
var chart = chartContainer.children.push(
  am5percent.PieChart.new(root, {
    endAngle: 270,
    innerRadius: am5.percent(60)
  })
);


var series = chart.series.push(
  am5percent.PieSeries.new(root, {
    valueField: "value",
    categoryField: "category",
    endAngle: 270,
    alignLabels: false
  })
);

series.children.push(am5.Label.new(root, {
  centerX: am5.percent(50),
  centerY: am5.percent(50),
  text: "First: {valueSum}",
  populateText: true,
  fontSize: "1.5em"
}));

series.slices.template.setAll({
  cornerRadius: 8
})

series.states.create("hidden", {
  endAngle: -90
});

series.labels.template.setAll({
  textType: "circular"
});


// Create the 2nd chart
// https://www.amcharts.com/docs/v5/charts/percent-charts/pie-chart/
var chart2 = chartContainer.children.push(
  am5percent.PieChart.new(root, {
    endAngle: 270,
    innerRadius: am5.percent(60)
  })
);

var series2 = chart2.series.push(
  am5percent.PieSeries.new(root, {
    valueField: "value",
    categoryField: "category",
    endAngle: 270,
    alignLabels: false,
    tooltip: am5.Tooltip.new(root, {}) // a separate tooltip needed for this series
  })
);

series2.children.push(am5.Label.new(root, {
  centerX: am5.percent(50),
  centerY: am5.percent(50),
  text: "Second: {valueSum}",
  populateText: true,
  fontSize: "1.5em"
}));

series2.slices.template.setAll({
  cornerRadius: 8
})

series2.states.create("hidden", {
  endAngle: -90
});

series2.labels.template.setAll({
  textType: "circular"
});


// Duplicate interaction
// Must be added before setting data
series.slices.template.events.on("pointerover", function(ev) {
  var slice = ev.target;
  var dataItem = slice.dataItem;
  var otherSlice = getSlice(dataItem, series2);

  if (otherSlice) {
    otherSlice.hover();
  }
});

series.slices.template.events.on("pointerout", function(ev) {
  var slice = ev.target;
  var dataItem = slice.dataItem;
  var otherSlice = getSlice(dataItem, series2);

  if (otherSlice) {
    otherSlice.unhover();
  }
});

series.slices.template.on("active", function(active, target) {
  var slice = target;
  var dataItem = slice.dataItem;
  var otherSlice = getSlice(dataItem, series2);

  if (otherSlice) {
    otherSlice.set("active", active);
  }
});

// Same for the 2nd series
series2.slices.template.events.on("pointerover", function(ev) {
  var slice = ev.target;
  var dataItem = slice.dataItem;
  var otherSlice = getSlice(dataItem, series);

  if (otherSlice) {
    otherSlice.hover();
  }
});

series2.slices.template.events.on("pointerout", function(ev) {
  var slice = ev.target;
  var dataItem = slice.dataItem;
  var otherSlice = getSlice(dataItem, series);

  if (otherSlice) {
    otherSlice.unhover();
  }
});

series2.slices.template.on("active", function(active, target) {
  var slice = target;
  var dataItem = slice.dataItem;
  var otherSlice = getSlice(dataItem, series);

  if (otherSlice) {
    otherSlice.set("active", active);
  }
});


// Set data
// https://www.amcharts.com/docs/v5/charts/percent-charts/pie-chart/#Setting_data
series.data.setAll([{
  category: "Lithuania",
  value: 501
}, {
  category: "Czechia",
  value: 301
}, {
  category: "Ireland",
  value: 201
}, {
  category: "Germany",
  value: 165
}]);

// Set data
// https://www.amcharts.com/docs/v5/charts/percent-charts/pie-chart/#Setting_data
series2.data.setAll([{
  category: "Lithuania",
  value: 201
}, {
  category: "Czechia",
  value: 101
}, {
  category: "Ireland",
  value: 51
}, {
  category: "Germany",
  value: 15
}]);



function getSlice(dataItem, series) {
  var otherSlice;
  am5.array.each(series.dataItems, function(di) {
    if (di.get("category") === dataItem.get("category")) {
      otherSlice = di.get("slice");
    }
  });

  return otherSlice;
}

// Create legend
var legend = root.container.children.push(am5.Legend.new(root, {
  x: am5.percent(50),
  centerX: am5.percent(50)
}));


// Trigger all the same for the 2nd series
legend.itemContainers.template.events.on("pointerover", function(ev) {
  var dataItem = ev.target.dataItem.dataContext;
  var slice = getSlice(dataItem, series2);
  slice.hover();
});

legend.itemContainers.template.events.on("pointerout", function(ev) {
  var dataItem = ev.target.dataItem.dataContext;
  var slice = getSlice(dataItem, series2);
  slice.unhover();
});

legend.itemContainers.template.on("disabled", function(disabled, target) {
  var dataItem = target.dataItem.dataContext;
  var slice = getSlice(dataItem, series2);
  if (disabled) {
    series2.hideDataItem(slice.dataItem);
  }
  else {
    series2.showDataItem(slice.dataItem);
  }
});

legend.data.setAll(series.dataItems);

series.appear(1000, 100);

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

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