protected FillCurveSet2d ComputeFillPaths(GeneralPolygon2d poly, SegmentSet2d polyCache)
{
List <List <Segment2d> > StepSpans = ComputeSegments(poly, polyCache);
int N = StepSpans.Count;
//double hard_max_dist = 5 * PathSpacing;
// [TODO] need a pathfinder here, that can chain segments efficiently
// (for now just do dumb things?)
FillCurveSet2d paths = new FillCurveSet2d();
//FillPolyline2d cur = new FillPolyline2d();
foreach (var seglist in StepSpans)
{
foreach (Segment2d seg in seglist)
{
FillPolyline2d fill_seg = new FillPolyline2d()
{
TypeFlags = FillTypeFlags.SolidInfill
};
fill_seg.AppendVertex(seg.P0);
fill_seg.AppendVertex(seg.P1);
paths.Append(fill_seg);
}
}
return(paths);
}
// extract set of spans from poly where clipped=false
List <FillPolyline2d> find_polygon_spans(Vector2d[] poly, bool[] clipped)
{
// assumption: at least one vtx is clipped
int iStart = 0;
// handle no-wrap case
if (clipped[iStart] == false && clipped[poly.Length - 1] == true)
{
iStart = 0;
}
else
{
while (clipped[iStart] == true) // find first non-clipped pt
{
iStart++;
}
}
List <FillPolyline2d> result = new List <FillPolyline2d>();
int iCur = iStart;
bool done = false;
while (done == false)
{
FillPolyline2d cur = new FillPolyline2d();
do
{
cur.AppendVertex(poly[iCur]);
iCur = (iCur + 1) % poly.Length;
} while (clipped[iCur] == false && iCur != iStart);
if (cur.VertexCount > 1)
{
result.Add(cur);
}
while (clipped[iCur] && iCur != iStart)
{
iCur++;
}
if (iCur == iStart)
{
done = true;
}
}
return(result);
}
// (approximately) clip insetPoly to band around clipPoly.
// vertices are discarded if outside clipPoly, or within clip_dist
// remaining polylines are returned
// In all-pass case currently returns polyline w/ explicit first==last vertices
public List <FillPolyline2d> clip_to_band(Polygon2d insetpoly, GeneralPolygon2d clipPoly, double clip_dist)
{
double clipSqr = clip_dist * clip_dist;
int N = insetpoly.VertexCount;
Vector2d[] midline = new Vector2d[N];
bool[] clipped = new bool[N];
int nClipped = 0;
for (int i = 0; i < N; ++i)
{
Vector2d po = insetpoly[i];
if (clipPoly.Contains(po) == false)
{
clipped[i] = true;
nClipped++;
continue;
}
int iHole, iSeg; double segT;
double distSqr = clipPoly.DistanceSquared(po, out iHole, out iSeg, out segT);
if (distSqr < clipSqr)
{
clipped[i] = true;
nClipped++;
continue;
}
// not ideal...
midline[i] = po;
}
if (nClipped == N)
{
return(new List <FillPolyline2d>());
}
if (nClipped == 0)
{
FillPolyline2d all = new FillPolyline2d(midline);
all.AppendVertex(all.Start);
return(new List <FillPolyline2d>()
{
all
});
}
return(find_polygon_spans(midline, clipped));
}
/// <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);
}
