--- layout: example.html title: Tracing around a polygon shortdesc: Using the draw interaction to trace around features. docs: > The draw interaction has a trace option to enable tracing around existing features. This example uses the traceSource option to trace features from one source and add them to another source. The first click on an edge of the target feature will start tracing. The second click on the edge will stop tracing. tags: "draw, trace, vector, snap, topology" ---