Add Line

Creates new line or adds new point to an existing line. If the mode is started without active line, new line creation is started. If there was an active line, new points are added to it.

Each mouse click adds new point to the line. If pointed above the exiting point, the point is copied to the current line. All point specific attributes (id) and coordinates are copied to the new point. Common line attributes (category, feature) are not copied.

When clicking anywhere else on the canvas, point with mouse coordinates and zero height is added to the line.

Accepting changes combines all added points to a single operation. When undoing the operation all added points are removed. Canceling the mode also discards all added points.