private static void AddPointsBetweenForward(
List <Point2> results,
Ring2 ring,
PolygonBoundaryLocation from,
PolygonBoundaryLocation to
)
{
Contract.Requires(results != null);
Contract.Requires(ring != null);
Contract.Requires(from != null);
Contract.Requires(to != null);
Contract.Ensures(results.Count >= Contract.OldValue(results).Count);
if (from.SegmentIndex == to.SegmentIndex && from.SegmentRatio <= to.SegmentRatio)
{
return; // no points will result from this
}
var segmentCount = ring.SegmentCount;
var currentSegmentIndex = IterationUtils.AdvanceLoopingIndex(from.SegmentIndex, segmentCount);
do
{
if (to.SegmentIndex == currentSegmentIndex)
{
if (to.SegmentRatio > 0)
{
results.Add(ring[currentSegmentIndex]);
}
return;
}
results.Add(ring[currentSegmentIndex]);
currentSegmentIndex = IterationUtils.AdvanceLoopingIndex(currentSegmentIndex, segmentCount);
} while (true);
}
/// <summary>
/// Creates a new polygon crossing defined by a point on the respective location on each polygon boundary.
/// </summary>
/// <param name="p">The calculated point of intersection.</param>
/// <param name="locationA">The location on the first polygon boundary.</param>
/// <param name="locationB">The location on the second polygon boundary.</param>
public PolygonCrossing(Point2 p, PolygonBoundaryLocation locationA, PolygonBoundaryLocation locationB)
{
if (null == locationA)
{
throw new ArgumentNullException("locationA");
}
if (null == locationB)
{
throw new ArgumentNullException("locationB");
}
Contract.EndContractBlock();
Point = p;
LocationA = locationA;
LocationB = locationB;
}