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Drag:
in this mode, you can zoom, pan and rotate the map. In this mode, you can
select a rectangular area according to "Ctrl + left mouse button", and the virtual
wall in this area will be cleared
Draw curve:
you can draw a curve, which is often used to draw irregular terrain
Draw a straight line:
click two positions to draw a straight line between the
positions you click. It is often used in regular terrain or rough area drawing
Eraser
：
Circle the virtual wall that needs to be cleared
Save:
only click Save to save the drawn virtual wall
Clear:
if you are not satisfied with the current virtual wall, click the clear button to
clear all the virtual walls (you need to click Save to take effect)
Example: glass wall
Note: the laser can penetrate the glass, so when drawing the virtual wall, pay
attention to the virtual wall outside the glass
