Some embodiments of the invention are placers that use lines that are not orthogonal with each other to calculate the costs of potential placement configurations. Some of these embodiments use non-orthogonal lines to measure congestion costs of potential placement configurations. For instance, some embodiments...http://www.google.es/patents/US6848091?utm_source=gb-gplus-sharePatente US6848091 - Partitioning placement method and apparatus
