public bool Compute()
{
if (InsetFromInputPolygon)
{
double inset = ToolWidth * InsetFromInputPolygonX;
var current = ClipperUtil.ComputeOffsetPolygon(Polygon, -inset, true);
foreach (var poly in current)
{
FillCurveSet2d fillPaths = ComputeFillPaths(poly);
if (fillPaths != null)
{
FillCurves.Add(fillPaths);
}
}
}
else
{
FillCurveSet2d fillPaths = ComputeFillPaths(Polygon);
if (fillPaths != null)
{
FillCurves.Add(fillPaths);
}
}
return(true);
}
/// <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?)
if (SimplifyBeforeFilling)
{
poly = SimplifyInputPolygon(poly);
}
// 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)
{
pathGraph = FilterPathGraphSelfOverlaps(pathGraph);
}
return(WalkPathGraph(pathGraph));
}
/// <summary>
/// Fallback to deal with very tiny polygons that disappear when insetting.
/// This happens at Z-minima-tips, which can be a problem because it may leave
/// gaps between layers. For tips we draw a tiny circle.
/// For elongated shapes we...?? currently do something dumb.
/// Probably should use robust thinning!
/// </summary>
public virtual void HandleTinyPolygon()
{
//(InsetFromInputPolygon) ?
//ClipperUtil.ComputeOffsetPolygon(Polygon, -ToolWidth / 2, true) :
AxisAlignedBox2d bounds = Polygon.Bounds;
if (bounds.MaxDim < ToolWidth)
{
GeneralPolygon2d min_poly = new GeneralPolygon2d(Polygon2d.MakeCircle(ToolWidth / 4, 6));
min_poly.Outer.Translate(bounds.Center);
FillCurveSet2d paths = ShellPolysToPaths(new List <GeneralPolygon2d>()
{
min_poly
}, 0);
Shells.Add(paths);
}
else
{
FillCurveSet2d paths = ShellPolysToPaths(new List <GeneralPolygon2d>()
{
Polygon
}, 0);
Shells.Add(paths);
}
InnerPolygons = new List <GeneralPolygon2d>();
}
public bool Compute()
{
if (InsetFromInputPolygon)
{
//BoundaryPolygonCache = new SegmentSet2d(Polygon);
List <GeneralPolygon2d> current = ClipperUtil.ComputeOffsetPolygon(Polygon, -ToolWidth / 2, true);
foreach (GeneralPolygon2d poly in current)
{
FillCurveSet2d fillPaths = ComputeFillPaths(poly);
if (fillPaths != null)
{
FillCurves.Add(fillPaths);
}
}
}
else
{
List <GeneralPolygon2d> boundary = ClipperUtil.ComputeOffsetPolygon(Polygon, ToolWidth / 2, true);
//BoundaryPolygonCache = new SegmentSet2d(boundary);
FillCurveSet2d fillPaths = ComputeFillPaths(Polygon);
if (fillPaths != null)
{
FillCurves.Add(fillPaths);
}
}
return(true);
}
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);
}
protected FillCurveSet2d ComputeFillPaths(GeneralPolygon2d poly, SegmentSet2d polyCache)
{
var stepSpans = ComputeSegments(poly, polyCache);
// [TODO] need a pathfinder here, that can chain segments efficiently
// (for now just do dumb things?)
FillCurveSet2d paths = new FillCurveSet2d();
foreach (var seglist in stepSpans)
{
foreach (Segment2d seg in seglist)
{
// Discard paths that are too short
if (seg.Length < MinPathLengthMM)
{
continue;
}
var fill_seg = new FillCurve <FillSegment>()
{
FillType = FillType,
};
fill_seg.BeginCurve(seg.P0);
fill_seg.AddToCurve(seg.P1, new FillSegment());
paths.Append(fill_seg);
}
}
return(paths);
}
public void SortAndAppendTo(Vector2d startPoint, IFillPathScheduler2d scheduler)
{
var saveHint = scheduler.SpeedHint;
OutPoint = startPoint;
List <Index3i> sorted = find_short_path_v1(startPoint);
foreach (Index3i idx in sorted)
{
FillCurveSet2d paths = new FillCurveSet2d();
SchedulerSpeedHint pathHint = SchedulerSpeedHint.Default;
if (idx.a == 0) // loop
{
PathLoop loop = Loops[idx.b];
pathHint = loop.speedHint;
if (idx.c != 0)
{
int iStart = idx.c;
FillPolygon2d o = new FillPolygon2d();
int N = loop.curve.VertexCount;
for (int i = 0; i < N; ++i)
{
o.AppendVertex(loop.curve[(i + iStart) % N]);
}
o.TypeFlags = loop.curve.TypeFlags;
paths.Append(o);
OutPoint = o.Vertices[0];
}
else
{
paths.Append(loop.curve);
OutPoint = loop.curve.Vertices[0];
}
}
else // span
{
PathSpan span = Spans[idx.b];
if (idx.c == 1)
{
span.curve.Reverse();
}
paths.Append(span.curve);
OutPoint = span.curve.End;
pathHint = span.speedHint;
}
scheduler.SpeedHint = pathHint;
scheduler.AppendCurveSets(new List <FillCurveSet2d>()
{
paths
});
}
scheduler.SpeedHint = saveHint;
}
public virtual void SortAndAppendTo(Vector2d startPoint, IFillPathScheduler2d scheduler)
{
var saveHint = scheduler.SpeedHint;
CurrentPosition = startPoint;
List <Index3i> sorted = find_short_path_v1(startPoint);
foreach (Index3i idx in sorted)
{
FillCurveSet2d paths = new FillCurveSet2d();
SpeedHint pathHint = SpeedHint.Default;
if (idx.a == 0)
{ // loop
PathLoop loop = Loops[idx.b];
pathHint = loop.speedHint;
if (idx.c != 0)
{
var rolled = loop.loop.RollToVertex(idx.c);
paths.Append(rolled);
CurrentPosition = rolled.Entry;
}
else
{
paths.Append(loop.loop);
CurrentPosition = loop.loop.Entry;
}
}
else
{ // span
PathSpan span = Spans[idx.b];
if (idx.c == 1)
{
span.curve = span.curve.Reversed();
}
paths.Append(span.curve);
CurrentPosition = span.curve.Exit;
pathHint = span.speedHint;
}
scheduler.SpeedHint = pathHint;
scheduler.AppendCurveSets(new List <FillCurveSet2d>()
{
paths
});
}
scheduler.SpeedHint = saveHint;
}
private FillCurveSet2d WalkPathGraph(DGraph2 pathGraph)
{
var boundaries = IdentifyBoundaryHashSet(pathGraph);
var paths = new FillCurveSet2d();
// 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];
var path = new FillCurve <FillSegment>()
{
FillType = this.FillType
};
path.BeginCurve(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.AddToCurve(pathGraph.GetVertex(vid), new FillSegment(true));
}
else
{
path.AddToCurve(pathGraph.GetVertex(vid));
}
if (boundaries.Contains(vid))
{
boundaries.Remove(vid);
break;
}
}
// discard paths that are too short
if (path.TotalLength() < 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 checking for collisions? we could end up creating
// non-trivial overlaps here...
if (SimplifyAmount != SimplificationLevel.None && path.Elements.Count > 1)
{
path = SimplifyPath(path);
}
paths.Append(path);
}
return(paths);
}
/// <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);
}
/// <summary>
/// Convert the input polygons to a set of paths.
/// If FilterSelfOverlaps=true, then the paths will be clipped against
/// themselves, in an attempt to avoid over-printing.
/// </summary>
public virtual FillCurveSet2d ShellPolysToPaths(List <GeneralPolygon2d> shell_polys, int nShell)
{
FillCurveSet2d paths = new FillCurveSet2d();
FillTypeFlags flags = FillTypeFlags.PerimeterShell;
if (nShell == 0 && ShellType == ShellTypes.ExternalPerimeters)
{
flags = FillTypeFlags.OutermostShell;
}
else if (ShellType == ShellTypes.InternalShell)
{
flags = FillTypeFlags.InteriorShell;
}
else if (ShellType == ShellTypes.BridgeShell)
{
flags = FillTypeFlags.BridgeSupport;
}
if (FilterSelfOverlaps == false)
{
foreach (GeneralPolygon2d shell in shell_polys)
{
paths.Append(shell, flags);
}
return(paths);
}
int outer_shell_edgegroup = 100;
foreach (GeneralPolygon2d shell in shell_polys)
{
PathOverlapRepair repair = new PathOverlapRepair();
repair.OverlapRadius = SelfOverlapTolerance;
repair.Add(shell, outer_shell_edgegroup);
// Ideally want to presreve outermost shell of external perimeters.
// However in many cases internal holes are 'too close' to outer border.
// So we will still apply to those, but use edge filter to preserve outermost loop.
// [TODO] could we be smarter about this somehow?
if (PreserveOuterShells && nShell == 0 && ShellType == ShellTypes.ExternalPerimeters)
{
repair.PreserveEdgeFilterF = (eid) => { return(repair.Graph.GetEdgeGroup(eid) == outer_shell_edgegroup); }
}
;
repair.Compute();
DGraph2Util.Curves c = DGraph2Util.ExtractCurves(repair.GetResultGraph());
foreach (var polygon in c.Loops)
{
paths.Append(polygon, flags);
}
foreach (var polyline in c.Paths)
{
if (polyline.ArcLength < DiscardTinyPerimterLengthMM)
{
continue;
}
if (polyline.Bounds.MaxDim < DiscardTinyPerimterLengthMM)
{
continue;
}
paths.Append(new FillPolyline2d(polyline)
{
TypeFlags = flags
});
}
}
return(paths);
}
public bool Compute()
{
bool enable_thin_check = false;
double thin_check_offset = ToolWidth * 0.45;
double thin_check_thresh_sqr = ToolWidth * 0.3;
thin_check_thresh_sqr *= thin_check_thresh_sqr;
// first shell is either polygon, or inset from that polygon
List <GeneralPolygon2d> current = null;
if (InsetFromInputPolygonX != 0)
{
current = ComputeInitialInsetPolygon(PreserveInputInsetTopology);
}
else
{
current = new List <GeneralPolygon2d>()
{
Polygon
};
}
List <GeneralPolygon2d> current_prev = null;
if (current.Count == 0)
{
HandleTinyPolygon();
return(true);
}
// convert previous layer to shell, and then compute next layer
List <GeneralPolygon2d> failedShells = new List <GeneralPolygon2d>();
List <GeneralPolygon2d> nextShellTooThin = new List <GeneralPolygon2d>();
for (int i = 0; i < Layers; ++i)
{
FillCurveSet2d paths = ShellPolysToPaths(current, i);
Shells.Add(paths);
List <GeneralPolygon2d> all_next = new List <GeneralPolygon2d>();
foreach (GeneralPolygon2d gpoly in current)
{
List <GeneralPolygon2d> offsets =
ClipperUtil.ComputeOffsetPolygon(gpoly, -PathSpacing, true);
List <GeneralPolygon2d> filtered = new List <GeneralPolygon2d>();
foreach (var v in offsets)
{
bool bTooSmall = (v.Perimeter < DiscardTinyPerimterLengthMM ||
v.Area < DiscardTinyPolygonAreaMM2);
if (bTooSmall)
{
continue;
}
if (enable_thin_check && is_too_thin(v, thin_check_offset, thin_check_thresh_sqr))
{
nextShellTooThin.Add(v);
}
else
{
filtered.Add(v);
}
}
if (filtered.Count == 0)
{
failedShells.Add(gpoly);
}
else
{
all_next.AddRange(filtered);
}
}
current_prev = current;
current = all_next;
}
// failedShells have no space for internal contours. But
// we might be able to fit a single line...
//foreach (GeneralPolygon2d gpoly in failedShells) {
// if (gpoly.Perimeter < DiscardTinyPerimterLengthMM ||
// gpoly.Area < DiscardTinyPolygonAreaMM2)
// continue;
// List<FillPolyline2d> thin_shells = thin_offset(gpoly);
// Shells[Shells.Count - 1].Append(thin_shells);
//}
// remaining inner polygons
if (InsetInnerPolygons)
{
InnerPolygons = current;
InnerPolygons.AddRange(nextShellTooThin);
}
else
{
InnerPolygons = current_prev;
InnerPolygons.AddRange(nextShellTooThin);
}
return(true);
}
/// <summary>
/// Convert the input polygons to a set of paths.
/// If FilterSelfOverlaps=true, then the paths will be clipped against
/// themselves, in an attempt to avoid over-printing.
/// </summary>
public virtual FillCurveSet2d ShellPolysToPaths(List <GeneralPolygon2d> shell_polys, int nShell)
{
FillCurveSet2d paths = new FillCurveSet2d();
IFillType currentFillType = nShell == 0 ? firstShellFillType ?? fillType : fillType;
if (FilterSelfOverlaps == false)
{
foreach (var shell in shell_polys)
{
paths.Append(new FillLoop <FillSegment>(shell.Outer.Vertices)
{
FillType = currentFillType, PerimeterOrder = nShell
});
foreach (var hole in shell.Holes)
{
paths.Append(new FillLoop <FillSegment>(hole.Vertices)
{
FillType = currentFillType, PerimeterOrder = nShell, IsHoleShell = true
});;
}
}
return(paths);
}
int outer_shell_edgegroup = 100;
foreach (GeneralPolygon2d shell in shell_polys)
{
PathOverlapRepair repair = new PathOverlapRepair();
repair.OverlapRadius = SelfOverlapTolerance;
repair.Add(shell, outer_shell_edgegroup);
// Ideally want to presreve outermost shell of external perimeters.
// However in many cases internal holes are 'too close' to outer border.
// So we will still apply to those, but use edge filter to preserve outermost loop.
// [TODO] could we be smarter about this somehow?
if (PreserveOuterShells && nShell == 0)
{
repair.PreserveEdgeFilterF = (eid) => { return(repair.Graph.GetEdgeGroup(eid) == outer_shell_edgegroup); }
}
;
repair.Compute();
DGraph2Util.Curves c = DGraph2Util.ExtractCurves(repair.GetResultGraph());
#region Borrow nesting calculations from PlanarSlice to enforce winding direction
PlanarComplex complex = new PlanarComplex();
foreach (Polygon2d poly in c.Loops)
{
complex.Add(poly);
}
PlanarComplex.FindSolidsOptions options
= PlanarComplex.FindSolidsOptions.Default;
options.WantCurveSolids = false;
options.SimplifyDeviationTolerance = 0.001;
options.TrustOrientations = false;
options.AllowOverlappingHoles = false;
PlanarComplex.SolidRegionInfo solids = complex.FindSolidRegions(options);
foreach (var polygon in solids.Polygons)
{
polygon.EnforceCounterClockwise();
paths.Append(new FillLoop <FillSegment>(polygon.Outer.Vertices)
{
FillType = currentFillType,
PerimeterOrder = nShell
});
foreach (var hole in polygon.Holes)
{
paths.Append(new FillLoop <FillSegment>(hole.Vertices)
{
FillType = currentFillType,
PerimeterOrder = nShell,
IsHoleShell = true,
});
}
}
#endregion Borrow nesting calculations from PlanarSlice to enforce winding direction
foreach (var polyline in c.Paths)
{
if (polyline.ArcLength < DiscardTinyPerimeterLengthMM)
{
continue;
}
if (polyline.Bounds.MaxDim < DiscardTinyPerimeterLengthMM)
{
continue;
}
paths.Append(new FillCurve <FillSegment>(polyline)
{
FillType = currentFillType, PerimeterOrder = nShell
});
}
}
return(paths);
}