public static ProjectionStage CreateInitialProjection(List <PPath> square, Projection p)
{
ProjectionStage stage = new ProjectionStage();
var corners = new[] { new Vector(0, 0), new Vector(p.SideX, 0), new Vector(p.SideX, p.SideY), new Vector(0, p.SideY) };
var direction = new[] { new Vector(1, 0), new Vector(0, 1), new Vector(-1, 0), new Vector(0, -1) };
for (int i = 0; i < 4; i++)
{
Rational len = 0;
for (int k = 0; k < square[i].edges.Count; k++)
{
var location = corners[i] + direction[i] * len;
var node = square[i].edges[k].From;
var pr = new NodeProjection {
Original = node, Projection = location
};
stage.Nodes.Add(pr);
len += square[i].edges[k].Data.length;
}
}
int ptr = 0;
foreach (var s in square)
{
foreach (var e in s.edges)
{
Segment seg = e.Data.segment;
if (!p.AllSegments.Contains(seg))
{
seg = new Segment(e.Data.segment.End, e.Data.segment.Start);
if (!p.AllSegments.Contains(seg))
{
throw new Exception();
}
}
var begin = stage.Nodes[ptr];
var end = stage.Nodes[(ptr + 1) % stage.Nodes.Count];
ptr++;
stage.Edges.Add(new EdgeProjection {
begin = begin, end = end, Segments = new List <Segment> {
e.Data.segment
}
});
}
}
return(stage);
}
public static IEnumerable <ProjectionStage> TrySquashPoint(ProjectionCurrentState state, List <AdjoinedSegmentFamilySubset> edges, Projection pr)
{
var sizes = edges.Select(z => state.nodesMap[z.ProjectedNode].Count).ToArray();
foreach (var p in GetCounting(sizes))
{
var proj = new NodeProjection[sizes.Length];
for (int i = 0; i < sizes.Length; i++)
{
proj[i] = state.nodesMap[edges[i].ProjectedNode][p[i]];
}
var vars = Arithmetic.RationalTriangulate(edges[0].family.Segment, edges[1].family.Segment, proj[0].Projection, proj[1].Projection);
if (vars == null)
{
continue;
}
foreach (var v in vars)
{
if (v.X < 0 || v.X > pr.SideX || v.Y < 0 || v.Y > pr.SideY)
{
continue;
}
var stage = new ProjectionStage();
var sq = new NodeProjection {
Original = edges[0].NonProjectedNode, Projection = v
};
stage.Nodes.Add(sq);
bool ok = true;
for (int k = 0; k < sizes.Length; k++)
{
var len = new Segment(v, proj[k].Projection);
if (len.QuadratOfLength != edges[k].family.Segment.QuadratOfLength)
{
ok = false;
break;
}
stage.Edges.Add(new EdgeProjection {
begin = sq, end = proj[k], Segments = edges[k].family.Insides.ToList()
});
}
if (ok)
{
yield return(stage);
}
}
}
}