/// <summary>
/// Given an input of perimeters that describe a single tile group, returns a list of ConvexPolygonShape2Ds that
/// represent the tile group but decomposed into rectangles.
/// </summary>
/// <param name="allPerims">Array of lists describing single tile group. Every list in the array represents a
/// different perimeter.</param>
/// <returns>A list of ConvexPolygonShape2Ds, with each one being a rectangle that the original irregular polygon
/// was decomposed into.</returns>
private static List <ConvexPolygonShape2D> _PartitionPolygonToRectangles(
IReadOnlyList <List <Vector2> > allPerims)
{
var partitionedRectangles = new List <ConvexPolygonShape2D>();
var allIsoPerims = new List <Vector2> [allPerims.Count];
for (int i = 0; i < allPerims.Count; i++)
{
//convert to iso axis so all the shapes 'look' rectangular
allIsoPerims[i] = AxisFuncs.CoordArrayToIsoAxis(allPerims[i]);
}
(List <Chord> chords, List <ChordlessPolygon> chordlessPolygons) = allIsoPerims.DecomposeComplexPolygonToRectangles();
List <List <Vector2> > allRectangles = chordlessPolygons.DecomposeChordlessPolygonToRectangles(chords);
foreach (List <Vector2> rectangle in allRectangles)
{
List <Vector2> carteRectangle = AxisFuncs.CoordArrayToCarteAxis(rectangle);
var cps2d = new ConvexPolygonShape2D()
{
Points = carteRectangle.ToArray()
};
partitionedRectangles.Add(cps2d);
}
return(partitionedRectangles);
}
/// <summary>
/// Creates PolyEdges from all TileEdges in the isometric axis (instead of the cartesian axis) and maps them to
/// each other.
/// </summary>
/// <param name="edgeColl"></param>
/// <returns>Two Dictionaries that map TileEdges to their respective PolyEdges and vice versa.</returns>
private static Dictionary <PolyEdge, TileEdge> _InitTilePolyBiDict(EdgeCollection <TileEdge> edgeColl)
{
var polyToTileMap = new Dictionary <PolyEdge, TileEdge>();
foreach (TileEdge tileEdge in edgeColl)
{
var polyEdge = new PolyEdge(AxisFuncs.CoordToIsoAxis(tileEdge.a), AxisFuncs.CoordToIsoAxis(tileEdge.b));
polyToTileMap[polyEdge] = tileEdge;
}
return(polyToTileMap);
}
