Draw

Points, lines and polygons can be drawn. On the left-bottom side of the viewer, longitude or area of the last line or polygon drawn can be seen.

Rounded shapes can be drawn pressing the uppercase key and drawing with the mouse at the same time. It is not advisable to draw complex shapes, as can reduce the performance of the application.

Delete points/nodes

To delete points that you have drawn, you have to select the figure with the "Modify vertex" tool, and then put the mouse over the point to be deleted. Press the "Delete" key and the point will be deleted, and the figure will be modified automatically.