Add Line Segment
Function Description: This tool allows the user to add a vector line segments to objects.
Steps
1.Select a linear layer, such as a lane line layer.
2.Click Add Line Segment 
button in the Vector Editor. Use the mouse to select the starting point of the selection in the point cloud, move the mouse, and click the left mouse button again to confirm the other end of the line.
Draw Line segment interface
Note: The geometric characteristics of the vector result must be consistent with the geometric characteristics of the layer to be added. For example, the point-like vector result must be added to the point-like layer, otherwise it will be prompted that it cannot be drawn. For the description of layers, see Layer Management