Donut or Doughnut chart is just a simple pie chart with a hole inside. You can define hole radius to any size you need, both in percent or pixels.
<h2>Donut chart with patterns</h2>
Click on PATTERNS theme above the chart - you will see that our pie or donut chart supports patterns. There are several pre-build patterns in our package or you can easily build your own fancy patterns and use them with our charts.