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Farseer physics body generation from voronoi cells

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This commit is contained in:
Regalis11
2015-06-22 16:55:42 +03:00
parent b45073fdec
commit 8bc65f983d
5 changed files with 47 additions and 34 deletions
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2
Subsurface/DebugConsole.cs
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@@ -200,7 +200,7 @@ namespace Subsurface
}
break;
case "generatelevel":
Game1.Level = new Level(Game1.localRandom.Next(), 20, 5000, 5000);
Game1.Level = new Level(Game1.localRandom.Next(), 20, 500, 500);
break;
case "fowenabled":
case "fow":

64
Subsurface/Map/Level.cs
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@@ -41,7 +41,7 @@ namespace Subsurface
{
for (int i = 0; i<2; i++)
{
int site = (i==0) ? ge.site1 : ge.site2;
Site site = (i==0) ? ge.site1 : ge.site2;
VoronoiCell cell = cells.Find(c => c.site == site);
if (cell == null)
{
@@ -60,11 +60,11 @@ namespace Subsurface
List<Vector2> vlist = new List<Vector2>();
foreach (GraphEdge ge in cell.edges)
{
if (vlist.Contains(ge.point1)) continue;
vlist.Add(ge.point1);
if (!vlist.Contains(ge.point1)) vlist.Add(ge.point1);
if (!vlist.Contains(ge.point2)) vlist.Add(ge.point2);
}
if (vlist.Count < 2) continue;
if (vlist.Count < 3) continue;
for (int i = 0; i < vlist.Count; i++ )
{
@@ -74,7 +74,7 @@ namespace Subsurface
//get farseer 'vertices' from vectors
Vertices _shapevertices = new Vertices(vlist);
//_shapevertices.Sort(less);
_shapevertices.Sort(new CompareCCW(cell.Center));
//feed vertices array to BodyFactory.CreatePolygon to get a new farseer polygonal body
Body _newBody = BodyFactory.CreatePolygon(Game1.world, _shapevertices, 15);
@@ -85,29 +85,6 @@ namespace Subsurface
}
}
public int Compare(Vector2 a, Vector2 b, Vector2 center)
{
if (a.X - center.X >= 0 && b.X - center.X < 0) return 1;
if (a.X - center.X < 0 && b.X - center.X >= 0) return -1;
if (a.X - center.X == 0 && b.X - center.X == 0)
{
if (a.Y - center.Y >= 0 || b.Y - center.Y >= 0) return Math.Sign(a.Y - b.Y);
return Math.Sign(b.Y-a.Y);
}
// compute the cross product of vectors (center -> a) x (center -> b)
float det = (a.X - center.X) * (b.Y - center.Y) - (b.X - center.X) * (a.Y - center.Y);
if (det < 0) return 1;
if (det > 0) return -1;
// points a and b are on the same line from the center
// check which point is closer to the center
float d1 = (a.X - center.X) * (a.X - center.X) + (a.Y - center.Y) * (a.Y - center.Y);
float d2 = (b.X - center.X) * (b.X - center.X) + (b.Y - center.Y) * (b.Y - center.Y);
return Math.Sign(d1 - d2);
}
List<GraphEdge> MakeVoronoiGraph(List<PointF> sites, Voronoi voronoi, int width, int height)
{
double[] xVal = new double[sites.Count];
@@ -132,4 +109,35 @@ namespace Subsurface
}
}
class CompareCCW : IComparer<Vector2>
{
private Vector2 center;
public CompareCCW(Vector2 center)
{
this.center = center;
}
public int Compare(Vector2 a, Vector2 b)
{
if (a.X - center.X >= 0 && b.X - center.X < 0) return 1;
if (a.X - center.X < 0 && b.X - center.X >= 0) return -1;
if (a.X - center.X == 0 && b.X - center.X == 0)
{
if (a.Y - center.Y >= 0 || b.Y - center.Y >= 0) return Math.Sign(a.Y - b.Y);
return Math.Sign(b.Y - a.Y);
}
// compute the cross product of vectors (center -> a) x (center -> b)
float det = (a.X - center.X) * (b.Y - center.Y) - (b.X - center.X) * (a.Y - center.Y);
if (det < 0) return 1;
if (det > 0) return -1;
// points a and b are on the same line from the center
// check which point is closer to the center
float d1 = (a.X - center.X) * (a.X - center.X) + (a.Y - center.Y) * (a.Y - center.Y);
float d2 = (b.X - center.X) * (b.X - center.X) + (b.Y - center.Y) * (b.Y - center.Y);
return Math.Sign(d1 - d2);
}
}
}

4
Subsurface/Map/Voronoi.cs
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@@ -543,8 +543,8 @@ namespace Voronoi2
newEdge.point1 = point1;
newEdge.point2 = point2;
newEdge.site1 = leftSite.sitenbr;
newEdge.site2 = rightSite.sitenbr;
newEdge.site1 = leftSite;
newEdge.site2 = rightSite;
}
private void clip_line( Edge e )

11
Subsurface/Map/VoronoiElements.cs
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@@ -117,9 +117,14 @@ namespace Voronoi2
public class VoronoiCell
{
public List<GraphEdge> edges;
public int site;
public Site site;
public VoronoiCell(int site)
public Vector2 Center
{
get { return new Vector2((float)site.coord.x, (float)site.coord.y); }
}
public VoronoiCell(Site site)
{
edges = new List<GraphEdge>();
this.site = site;
@@ -129,7 +134,7 @@ namespace Voronoi2
public class GraphEdge
{
public Vector2 point1, point2;
public int site1, site2;
public Site site1, site2;
}
// للترتيب

BIN
Subsurface_Solution.v12.suo
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