不是自动对齐打的吗?除非使用了offset参数 ?
set_pg_via_master_rule
-offset {x_offset y_offset}
Specifies the horizontal (x_offset) and vertical (y_offset) values to use when creating a contact code inside the intersection box. The
units are um. The offset is applied with respect to the center of the intersection box. By default, the offset is 0.