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the vertical line graphic to shaft turn 180 degrees to the
right, as shown in the figure below.
Y mirror
The corresponding icon on the toolbar ， After the selected
graphic, click the icon, the original center of graphics in the
graphics for horizontal axis downward turn 180 degrees, as shown
in the figure below.
Filter:The corresponding icon on the toolbar ，For the import of
graphics has to delete redundant overlapping segments
Closed:The corresponding icon on the toolbar
closing graphics
，For closed without
    "