How to reduce PieChart border size(width) in amcharts4?

Question

How to reduce PieChart border size(width) in amcharts like shown below? I want to reduce the first chart border size(width) like second one. I already set innerRadius property to 100 percent.

Answer 1

You have to increase both the innerRadius and radius to a large enough value to make the circle skinnier.

chart.innerRadius = am4core.percent(100);
chart.radius = am4core.percent(100);

Demo:

var chart = am4core.create("chartdiv", am4charts.PieChart);

chart.data = [{
  "category": "",
  "value": 100
}];

chart.innerRadius = am4core.percent(100)
chart.radius = am4core.percent(100) 

var pieSeries = chart.series.push(new am4charts.PieSeries());
pieSeries.dataFields.value = "value";
pieSeries.dataFields.category = "category";
pieSeries.ticks.template.disabled = true;
pieSeries.labels.template.disabled = true;
var label = pieSeries.createChild(am4core.Label)
label.text = "100%";
label.horizontalCenter = "middle";
label.verticalCenter = "middle";
label.fontSize = "2em"; 

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
}

#chartdiv {
  width: 200px;
  height: 200px;
}

<script src="https://cdn.amcharts.com/lib/4/core.js"></script>
<script src="https://cdn.amcharts.com/lib/4/charts.js"></script>
<div id="chartdiv"></div>