Function LoopRelation.aCrossingTarget

Optionally, a_target() and b_target() can specify an early-exit condition for the loop relation. If any point P is found such that


					
			int aCrossingTarget() const;

A.Contains(P) == a_crossing_target() && B.Contains(P) == b_crossing_target()

then the loop relation is assumed to be the same as if a pair of crossing edges were found. For example, the Contains() relation has

a_crossing_target() == 0 b_crossing_target() == 1

because if A.Contains(P) == 0 (false) and B.Contains(P) == 1 (true) for any point P, then it is equivalent to finding an edge crossing (i.e., since Contains() returns false in both cases).

Loop relations that do not have an early-exit condition of this form should return -1 for both crossing targets.

Authors

ericv@google.com (Eric Veach), madric@gmail.com (Vijay Nayar)

License

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS-IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

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