public static Line GetUnionLine([NotNull] this List <Line> lines)
{
using var wasteLines = new DisposableSet <Line>();
Line prew = null !;
Line?unionLine = null;
foreach (var l in lines)
{
if (prew == null)
{
prew = l;
continue;
}
var line = prew.GetUnionLine(l);
wasteLines.Add(line);
unionLine = prew;
prew = line;
}
if (unionLine == null)
{
return((Line)prew.Clone());
}
wasteLines.Remove(prew);
return(prew);
}
public static Hatch CreateHatch(this Region region, bool createOut, [CanBeNull] out DisposableSet <Polyline> externalLoops)
{
externalLoops = createOut ? new DisposableSet <Polyline>() : null;
var plsByLoop = region.GetPoints2dByLoopType();
var extLoops = plsByLoop.Where(p => p.Value != BrepLoopType.LoopInterior).ToList();
var intLoops = plsByLoop.Where(p => p.Value == BrepLoopType.LoopInterior).ToList();
if (!extLoops.Any())
{
return(null);
}
var h = new Hatch();
h.SetHatchPattern(HatchPatternType.PreDefined, "SOLID");
foreach (var item in extLoops)
{
var pts2dCol = item.Key;
pts2dCol.Add(item.Key[0]);
h.AppendLoop(HatchLoopTypes.External, pts2dCol, new DoubleCollection(new double[extLoops.Count + 1]));
if (createOut)
{
externalLoops.Add(pts2dCol.Cast <Point2d>().ToList().CreatePolyline());
}
}
if (intLoops.Any())
{
foreach (var item in intLoops)
{
var pts2dCol = item.Key;
pts2dCol.Add(item.Key[0]);
h.AppendLoop(HatchLoopTypes.SelfIntersecting, pts2dCol, new DoubleCollection(new double[intLoops.Count + 1]));
}
}
h.EvaluateHatch(true);
return(h);
}