public static void TestDifferenceOnPolyline()
{
// # * * #
// # * @
// # @ *
// # *
//
// ///////////////////////////////
//
// The polyline drawn in *s represents basePl
// The polyline drawn in #s represents compPl
// The @ represents their intersection points, so that
// the difference polyline will be basePl with two new vertices @ added.
com.esri.core.geometry.Polyline basePl = new com.esri.core.geometry.Polyline();
basePl.StartPath(new com.esri.core.geometry.Point(-117, 20));
basePl.LineTo(new com.esri.core.geometry.Point(-130, 10));
basePl.LineTo(new com.esri.core.geometry.Point(-120, 50));
com.esri.core.geometry.Polyline compPl = new com.esri.core.geometry.Polyline();
compPl.StartPath(new com.esri.core.geometry.Point(-116, 20));
compPl.LineTo(new com.esri.core.geometry.Point(-131, 10));
compPl.LineTo(new com.esri.core.geometry.Point(-121, 50));
com.esri.core.geometry.Geometry diffGeom = com.esri.core.geometry.GeometryEngine.Difference(basePl, compPl, com.esri.core.geometry.SpatialReference.Create(4326));
NUnit.Framework.Assert.IsTrue(diffGeom is com.esri.core.geometry.Polyline);
com.esri.core.geometry.Polyline diffPolyline = (com.esri.core.geometry.Polyline)diffGeom;
int pointCountDiffPolyline = diffPolyline.GetPointCount();
// first line in comp_pl is 3y = 2x + 292
NUnit.Framework.Assert.AreEqual(3 * 20, 2 * (-116) + 292);
NUnit.Framework.Assert.AreEqual(3 * 10, 2 * (-131) + 292);
// new points should also lie on this line
NUnit.Framework.Assert.IsTrue(3.0 * diffPolyline.GetCoordinates2D()[1].y - 2.0 * diffPolyline.GetCoordinates2D()[1].x - 292.0 == 0.0);
NUnit.Framework.Assert.IsTrue(3.0 * diffPolyline.GetCoordinates2D()[3].y - 2.0 * diffPolyline.GetCoordinates2D()[3].x - 292.0 == 0.0);
for (int i = 0; i < 3; i++)
{
NUnit.Framework.Assert.IsTrue(basePl.GetCoordinates2D()[i].x == diffPolyline.GetCoordinates2D()[2 * i].x);
NUnit.Framework.Assert.IsTrue(basePl.GetCoordinates2D()[i].y == diffPolyline.GetCoordinates2D()[2 * i].y);
}
NUnit.Framework.Assert.AreEqual(5, pointCountDiffPolyline);
}
