private static Boolean CheckIntersects(IGeometry target, IGeometry test)
{
bool expectedResult = target.Intersects(test);
PreparedGeometryFactory pgFact = new PreparedGeometryFactory();
IPreparedGeometry prepGeom = pgFact.Create(target);
bool prepResult = prepGeom.Intersects(test);
if (prepResult != expectedResult)
{
return false;
}
return true;
}
/// <summary>
/// Tests using PreparedGeometry, but creating a new
/// PreparedGeometry object each time.
/// This tests whether there is a penalty for using
/// the PG algorithm as a complete replacement for
/// the original algorithm.
/// </summary>
/// <param name="g">The polygonal test geometry</param>
/// <param name="lines">The lines to test for intersection with <paramref name="g"/></param>
/// <returns>The count</returns>
private static int TestPrepGeomNotCached(IGeometry g, IEnumerable<IGeometry> lines)
{
Console.WriteLine("Using NON-CACHED Prepared Geometry");
var pgFact = new PreparedGeometryFactory();
// PreparedGeometry prepGeom = pgFact.create(g);
int count = 0;
foreach (var line in lines)
{
// test performance of creating the prepared geometry each time
var prepGeom = pgFact.Create(g);
if (prepGeom.Intersects(line))
count++;
}
return count;
}
private static int TestPrepGeomCached(IGeometry g, IEnumerable<IGeometry> lines)
{
Console.WriteLine("Using cached Prepared Geometry");
var pgFact = new PreparedGeometryFactory();
var prepGeom = pgFact.Create(g);
var count = 0;
foreach (var line in lines)
{
if (prepGeom.Intersects(line))
count++;
}
return count;
}
public void TestResultsEqual(IGeometry g, ILineString line)
{
bool slowIntersects = g.Intersects(line);
PreparedGeometryFactory pgFact = new PreparedGeometryFactory();
IPreparedGeometry prepGeom = pgFact.Create(g);
bool fastIntersects = prepGeom.Intersects(line);
if (slowIntersects != fastIntersects)
{
Console.WriteLine(line);
Console.WriteLine("Slow = " + slowIntersects + ", Fast = " + fastIntersects);
throw new Exception("Different results found for intersects() !");
}
}
