Mission

Draw segments

Double click the left mouse button /
SHIFT+left mouse button /
Alt+hold left mouse button and draw free-handedly

Close polygonal objects

Draw polygon segments set the last segment near to first, or drag the last segment onto the first segment to close the polygon

Select segment

Left mouse-click on segment

Select multiple segments

(Win, Linux) CTRL+left mouse click on a figure /
(macOS) cmd+left mouse click on a figure

Select a range of multiple segments

(Win, Linux, macOS) Shift+left mouse click on a figure

Select segments from current to the last

(Win, Linux) CTRL+right mouse click on a figure /
(macOS) cmd+right mouse click on a figure

Select all segments

(Win, Linux) CTRL+A /
(macOS) cmd+A

Undo the last action

(Win, Linux) Ctrl+Z /
(macOS) cmd+Z

Reverse the undo

(Win, Linux) Ctrl+Y /
(macOS) cmd+Y

Move selected segment(-s)

Hover figure basement, hold the left mouse button and drag

Move map left, right, up, down

Hold the left mouse button and drag / left, right, up, and down keys

Zoom in

Mouse wheel/minus key/zoom-in gesture

Zoom out

Mouse wheel / plus key/zoom out gesture

Rotate screen camera left, right, up, and down

Hold the right mouse button and move the mouse /
hold Shift + left, right, up, and down keys.