Lasso

The Lasso Tool allows you to select objects or nodes in the work area using a polygon. This tool is useful when there is a large number of objects in the work area, they are close to each other, and it is not possible to use a simple rectangular selection.

Icon of Lasso Tool

The Lasso Tool is available in the main tool box

Click anywhere in the work area to place the first point. Then, repeat clicking to create the polygon. It is not necessary to close the polygon; a connection from the last point to the first point is created automatically. You can adjust the shape of the polygon by clicking on an existing point and dragging it to a new position. An arrow indicates the orientation of the polygon and is displayed on the line segment after a point is focused (highlighted).

It is possible to insert or delete lasso points using the INSERT and DEL keys on the keyboard. A point is inserted at the place where the arrow is displayed. Deleting a point erases the highlighted point. New points are also created by clicking on an empty area (i.e., not on an existing point). A new point is created after the highlighted point, so that the segment with the arrow is split into two parts.

If your device has no keyboard, then insert or delete points using the + and - buttons from the menu panel.

All changes to the polygon are stored in memory. Therefore, it is possible to use the Undo/Redo buttons or the CTRL+Z/CTRL+Y shortcuts.

There are several options for how to apply a polygonal selection:

Select: Clicking on this option selects objects that are entirely or partially inside the polygon. If there was any previous selection made, it is discarded.
Add: Clicking on this option will add objects inside the polygon to the existing selection.
Subtract: Clicking on this option will deselect objects inside the polygon from the existing selection.