A polyline is made up of spans and nodes. Spans can be lines, arcs or Bézier curves. You can change the position of the nodes and the nature of the spans after the polyline is created. For example, a linear span can be changed to an arc or a Bézier span.
You change a polyline's form using both the Node Editing and Vector Editing context menus. These menus are displayed when working in node-editing mode and right-clicking on either a span or a node.
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