private void DoSmoothing(long maxDist, int interations)
{
bool closedPath = true;
var path = this.Children.OfType <IPathObject>().FirstOrDefault();
if (path == null)
{
// clear our existing data
VertexSource = new VertexStorage();
return;
}
var sourceVertices = path.VertexSource;
var inputPolygons = sourceVertices.CreatePolygons();
Polygons outputPolygons = new Polygons();
foreach (Polygon inputPolygon in inputPolygons)
{
int numVerts = inputPolygon.Count;
long maxDistSquared = maxDist * maxDist;
var smoothedPositions = new Polygon(numVerts);
foreach (IntPoint inputPosition in inputPolygon)
{
smoothedPositions.Add(inputPosition);
}
for (int iteration = 0; iteration < interations; iteration++)
{
var positionsThisPass = new Polygon(numVerts);
foreach (IntPoint inputPosition in smoothedPositions)
{
positionsThisPass.Add(inputPosition);
}
int startIndex = closedPath ? 0 : 1;
int endIndex = closedPath ? numVerts : numVerts - 1;
for (int i = startIndex; i < endIndex; i++)
{
// wrap back to the previous index
IntPoint prev = positionsThisPass[(i + numVerts - 1) % numVerts];
IntPoint cur = positionsThisPass[i];
IntPoint next = positionsThisPass[(i + 1) % numVerts];
IntPoint newPos = (prev + cur + next) / 3;
IntPoint delta = newPos - inputPolygon[i];
if (delta.LengthSquared() > maxDistSquared)
{
delta = delta.GetLength(maxDist);
newPos = inputPolygon[i] + delta;
}
smoothedPositions[i] = newPos;
}
}
outputPolygons.Add(smoothedPositions);
outputPolygons = ClipperLib.Clipper.CleanPolygons(outputPolygons, Math.Max(maxDist / 10, 1.415));
}
VertexSource = outputPolygons.CreateVertexStorage();
}
