public void TriangulateLevel()
{
vg = Undo.AddComponent <VertexGraph>(gameObject);
// //For the purposes of inserting a level manually through a list of preset Vector2 vars.
// Vector2 [] vertices = new Vector2[] { <Insert Vector2s> };
// vg.AddPolygon (vertices);
// // Subsequent adding of obstacles is done through listing it as a separate list of vertices
// Gets the polygon objects out of the level component, from GRTK. If using a different method of supplying the polygon, this needs to be changed.
GRTK.Polygon [] polyArray = level.GetComponents <GRTK.Polygon>();
// adds all the polygons from the GRTK to the vertex graph. Starts at 1 rather than 0 because the outermost polygon in the GRTK method of level building is not part of the level.
for (int i = 1; i < polyArray.Length; i++)
{
vg.AddPolygon(polyArray[i].GetRaw2());
}
// First, need to draw the lines between vertices, granted they don't intersect any other lines (boundaries or drawn)
foreach (Vertex start in vg.GetVertices())
{
foreach (Vertex end in vg.GetVertices())
{
Line possibleEdge = new Line(start, end);
if (vg.IntersectsNothing(possibleEdge) && !end.Equals(start))
{
vg.DrawEdge(possibleEdge);
}
}
}
// Now, to delete all lines which are either in obstacles or exterior to the level.
// If a point on a drawn line which has an infinite line drawn off in some direction has an even number of intersections with
// the boundaries of the polygon, it is either outside of it or in an obstacle. This completes triangulation.
foreach (Line line in vg.GetDrawnEdges())
{
if (NumIntersects(line, vg) % 2 == 0)
{
vg.EraseEdge(line);
}
}
// Next, to calculate angles for and sort the edges stemming from each vertex, now that they're "finalized" for the purposes of triangulation.
foreach (Vertex v in vg.GetVertices())
{
v.SortEdges();
}
vg.createRegions();
}
public void DecomposeLevel()
{
// So in order to combine two regions and add the combined one, we need to take care of a few bookeeping things.
// Remove boundary line.
// Remove both original regions.
// Add the new one.
// This needs to be done for each drawn line in the vg.
foreach (Line l in vg.GetDrawnEdges())
{
Region r = new Region(l.cw, l.ccw, l);
if (r.IsConvex())
{
vg.RemoveRegion(l.cw); vg.RemoveRegion(l.ccw); vg.EraseEdge(l);
vg.AddRegion(r);
}
}
}
