Running an addin in ArcGIS Pro v3.3. When `GeometryEngine.Instance.Union(...)` is given ellipses, it produces empty geometries. Has anyone seen this before & come up with a workaround? Thanks!
This code . . .
List<Polygon> polygonParts = [];
foreach (Layer layer in layers)
{
// Stuff omitted for brevity
polygonFeatures = polygonFeatures.Where(p => p is not null && !p.IsEmpty)
.Select(polygon =>
{
// I tried adding this because I figured the elliptical curves were the issue, but clearly not. Note that circles DON'T need this treatment for Union to handle them appropriately.
if (polygon.HasCurves)
{
Log.Information("Pre-densified polygon has {0} vertices and is empty: {1}", polygon.PointCount, polygon.IsEmpty);
polygon = (Polygon)GeometryEngine.Instance.DensifyByAngle(polygon, -1);
Log.Information("Densified polygon has {0} vertices, is empty({1}), has area({2}), and has curves({3})", polygon.PointCount, polygon.IsEmpty, polygon.Area, polygon.HasCurves);
}
return polygon;
})
.ToArray();
polygonParts.AddRange(polygonFeatures);
}
Log.Information("Creating a union from {0} selected features in these layers: {1}", polygonParts.Count, layers.Select(layer => layer.Name));
var unionGeometry = await QueuedTask.Run(() => GeometryEngine.Instance.Union(polygonParts));
Log.Information("Unioned geometry has {0} vertices and is empty({1})", unionGeometry.PointCount, unionGeometry.IsEmpty);
var unionPolygon = (Polygon)unionGeometry;
Log.Information("Unioned polygon has area({0}), and has curves({1})", unionPolygon.Area, unionPolygon.HasCurves);
. . . produces this log when given ellipses (note the zero area, emptiness, and zero vertices) . . .
[11:48:03 INFO v1.0] Pre-densified polygon has 2 vertices and is empty: false
[11:48:03 INFO v1.0] Densified polygon has 37 vertices, is empty(false), has area(-11803.5397706948), and has curves(false)
[11:48:03 INFO v1.0] Pre-densified polygon has 2 vertices and is empty: false
[11:48:03 INFO v1.0] Densified polygon has 37 vertices, is empty(false), has area(-11803.5397706948), and has curves(false)
[11:48:03 INFO v1.0] Creating a union from 2 selected features in these layers: ["Graphics Layer"]
[11:48:03 INFO v1.0] Unioned geometry has 0 vertices and is empty(true)
[11:48:03 INFO v1.0] Unioned polygon has area(0), and has curves(false)
. . . and this log when given circles (note the nonzero area, non-emptiness, and nonzero vertices) . . .
[11:57:40 INFO v1.0] Pre-densified polygon has 2 vertices and is empty: false
[11:57:40 INFO v1.0] Densified polygon has 37 vertices, is empty(false), has area(7722.7340715872815), and has curves(false)
[11:57:40 INFO v1.0] Pre-densified polygon has 2 vertices and is empty: false
[11:57:40 INFO v1.0] Densified polygon has 37 vertices, is empty(false), has area(7722.7340715872815), and has curves(false)
[11:57:40 INFO v1.0] Creating a union from 2 selected features in these layers: ["Graphics Layer"]
[11:57:40 INFO v1.0] Unioned geometry has 74 vertices and is empty(false)
[11:57:40 INFO v1.0] Unioned polygon has area(15445.469156841702), and has curves(false)
