private FillCurve <FillSegment> SimplifyPath(FillCurve <FillSegment> path)
{
var simp = new PolySimplification2(new PolyLine2d(path.Vertices()));
switch (SimplifyAmount)
{
default:
case SimplificationLevel.Minor:
simp.SimplifyDeviationThreshold = ToolWidth / 4; break;
case SimplificationLevel.Moderate:
simp.SimplifyDeviationThreshold = ToolWidth / 2; break;
case SimplificationLevel.Aggressive:
simp.SimplifyDeviationThreshold = ToolWidth; break;
}
simp.Simplify();
path = new FillCurve <FillSegment>(simp.Result.ToArray())
{
FillType = this.FillType
};
return(path);
}
/// <summary>
/// fill poly w/ adjacent straight line segments, connected by connectors
/// </summary>
protected FillCurveSet2d ComputeFillPaths(GeneralPolygon2d poly)
{
FillCurveSet2d paths = new FillCurveSet2d();
// smooth the input poly a little bit, this simplifies the filling
// (simplify after?)
//GeneralPolygon2d smoothed = poly.Duplicate();
//CurveUtils2.LaplacianSmoothConstrained(smoothed, 0.5, 5, ToolWidth / 2, true, false);
//poly = smoothed;
// compute 2D non-manifold graph consisting of original polygon and
// inserted line segments
DGraph2 spanGraph = ComputeSpanGraph(poly);
if (spanGraph == null || spanGraph.VertexCount == poly.VertexCount)
{
return(paths);
}
DGraph2 pathGraph = BuildPathGraph(spanGraph);
// filter out self-overlaps from graph
if (FilterSelfOverlaps)
{
PathOverlapRepair repair = new PathOverlapRepair(pathGraph);
repair.OverlapRadius = ToolWidth * SelfOverlapToolWidthX;
repair.PreserveEdgeFilterF = (eid) => {
return(repair.Graph.GetEdgeGroup(eid) > 0);
};
repair.Compute();
pathGraph = repair.GetResultGraph();
}
HashSet <int> boundaries = new HashSet <int>();
foreach (int vid in pathGraph.VertexIndices())
{
if (pathGraph.IsBoundaryVertex(vid))
{
boundaries.Add(vid);
}
if (pathGraph.IsJunctionVertex(vid))
{
throw new Exception("DenseLinesFillPolygon: PathGraph has a junction???");
}
}
// walk paths from boundary vertices
while (boundaries.Count > 0)
{
int start_vid = boundaries.First();
boundaries.Remove(start_vid);
int vid = start_vid;
int eid = pathGraph.GetVtxEdges(vid)[0];
FillPolyline2d path = new FillPolyline2d()
{
TypeFlags = this.TypeFlags
};
path.AppendVertex(pathGraph.GetVertex(vid));
while (true)
{
Index2i next = DGraph2Util.NextEdgeAndVtx(eid, vid, pathGraph);
eid = next.a;
vid = next.b;
int gid = pathGraph.GetEdgeGroup(eid);
if (gid < 0)
{
path.AppendVertex(pathGraph.GetVertex(vid), TPVertexFlags.IsConnector);
}
else
{
path.AppendVertex(pathGraph.GetVertex(vid));
}
if (boundaries.Contains(vid))
{
boundaries.Remove(vid);
break;
}
}
// discard paths that are too short
if (path.ArcLength < MinPathLengthMM)
{
continue;
}
// run polyline simplification to get rid of unneccesary detail in connectors
// [TODO] we could do this at graph level...)
// [TODO] maybe should be checkign for collisions? we could end up creating
// non-trivial overlaps here...
if (SimplifyAmount != SimplificationLevel.None && path.VertexCount > 2)
{
PolySimplification2 simp = new PolySimplification2(path);
switch (SimplifyAmount)
{
default:
case SimplificationLevel.Minor:
simp.SimplifyDeviationThreshold = ToolWidth / 4; break;
case SimplificationLevel.Aggressive:
simp.SimplifyDeviationThreshold = ToolWidth; break;
case SimplificationLevel.Moderate:
simp.SimplifyDeviationThreshold = ToolWidth / 2; break;
}
simp.Simplify();
path = new FillPolyline2d(simp.Result.ToArray())
{
TypeFlags = this.TypeFlags
};
}
paths.Append(path);
}
// Check to make sure that we are not putting way too much material in the
// available volume. Computes extrusion volume from path length and if the
// ratio is too high, scales down the path thickness
// TODO: do we need to compute volume? If we just divide everything by
// height we get the same scaling, no? Then we don't need layer height.
if (MaxOverfillRatio > 0)
{
throw new NotImplementedException("this is not finished yet");
#if false
double LayerHeight = 0.2; // AAAHHH hardcoded nonono
double len = paths.TotalLength();
double extrude_vol = ExtrusionMath.PathLengthToVolume(LayerHeight, ToolWidth, len);
double polygon_vol = LayerHeight * Math.Abs(poly.Area);
double ratio = extrude_vol / polygon_vol;
if (ratio > MaxOverfillRatio && PathSpacing == ToolWidth)
{
double use_width = ExtrusionMath.WidthFromTargetVolume(LayerHeight, len, polygon_vol);
//System.Console.WriteLine("Extrusion volume: {0} PolyVolume: {1} % {2} ScaledWidth: {3}",
//extrude_vol, polygon_vol, extrude_vol / polygon_vol, use_width);
foreach (var path in paths.Curves)
{
path.CustomThickness = use_width;
}
}
#endif
}
return(paths);
}
