public ChordlessPolygon(Vector2[] outerPerim, List <Vector2>[] potentialHoles,
Dictionary <Vector2, HashSet <Vector2> > bridges, bool isHole)
{
if (outerPerim is null)
{
throw new ArgumentNullException(nameof(outerPerim));
}
if (potentialHoles is null)
{
throw new ArgumentNullException(nameof(potentialHoles));
}
this.isHole = isHole;
this._outerPerimUnsimplified = outerPerim;
this._outerPerim = _SimplifyOuterPerim(outerPerim);
this._holes = !this.isHole ? this._GetContainedHoles(potentialHoles) : System.Array.Empty <List <Vector2> >();
this._bridges = bridges;
if (!GeometryFuncs.IsPolygonCCW(this._outerPerim))
{
var reversePerim = this.outerPerim.ToList();
reversePerim.Reverse();
this._outerPerim = reversePerim.ToArray();
}
foreach (List <Vector2> hole in this._holes)
{
if (!GeometryFuncs.IsPolygonCCW(hole.ToArray()))
{
hole.Reverse();
}
}
}
/// <summary>
/// Decomposes a complex polygon described by the input <param>allIsoPerims</param> into the minimum number of
/// rectangles (actually a lie, decomposes them into chordless polygons, which is decomposed into rectangles in
/// another class).
/// </summary>
/// <param name="allIsoPerims">Array of lists of Vector2s. Each list describes a perimeter, whether it be
/// the complex polygon's outer perimeters or holes (the 0'th index is always the outer perimeter).</param>
/// <returns>A list of lists of Vector2s. Each list describes a rectangle in coordinates that follow the
/// isometric axis (and need to be converted back to the cartesian axis elsewhere).</returns>
// ReSharper disable once ReturnTypeCanBeEnumerable.Global
public static (List <Chord>, List <ChordlessPolygon>) DecomposeComplexPolygonToRectangles(this List <Vector2>[] allIsoPerims)
{
if (allIsoPerims is null)
{
throw new ArgumentNullException(nameof(allIsoPerims));
}
foreach (List <Vector2> perim in allIsoPerims)
{
if (!GeometryFuncs.IsPolygonCCW(perim.ToArray()))
{
perim.Reverse();
}
}
(List <Chord> chords, List <ChordlessPolygon> chordlessPolygons) = _ComplexToChordlessPolygons(allIsoPerims);
return(chords, chordlessPolygons);
}