Read the rrlx file.
Finish the count of the polygons' node.
update
Finish the decrease of point.
Fix a bug.
update
Get the rectangle of buffer area.
update
Change the variable from float to int.
Change from int to float.
update
Finish the logic of moving point
Finish the new feature.
Finish the effective polygons.
Finish reading the effective polygons' point.
Finish the polygon clipping.
Handle the conflict