This is a demo tutorial. While there is no step-by-step commentary available (yet), the live demo below is fully functional. Feel free to open it for full source code.
This demo shows how we can use events to affix a clicked node of a Force-Directed Tree to the middle of the chart.
See the Pen Centering on a clicked node in a Force-Directed Tree by amCharts team (@amcharts) on CodePen.