/// <summary>
/// Creates a breakable body. You would want to remove collinear points before using this.
/// </summary>
/// <param name="world">The world.</param>
/// <param name="vertices">The vertices.</param>
/// <param name="density">The density.</param>
/// <param name="position">The position.</param>
/// <returns></returns>
public static BreakableBody CreateBreakableBody(World world, Vertices vertices, FP density, FPVector2 position)
{
List <Vertices> triangles = Triangulate.ConvexPartition(vertices, TriangulationAlgorithm.Earclip, true, FP.EN3);
BreakableBody breakableBody = new BreakableBody(triangles, world, density);
breakableBody.MainBody.Position = position;
world.AddBreakableBody(breakableBody);
return(breakableBody);
}
public static List <Fixture> AttachSolidArc(FP density, FP radians, int sides, FP radius, FPVector2 position, FP angle, Body body)
{
Vertices arc = PolygonTools.CreateArc(radians, sides, radius);
arc.Rotate((FP.Pi - radians) / 2 + angle);
arc.Translate(ref position);
//Close the arc
arc.Add(arc[0]);
List <Vertices> triangles = Triangulate.ConvexPartition(arc, TriangulationAlgorithm.Earclip, true, FP.EN3);
return(AttachCompoundPolygon(triangles, density, body));
}
/// <summary>
/// Creates a rounded rectangle.
/// Note: Automatically decomposes the capsule if it contains too many vertices (controlled by Settings.MaxPolygonVertices)
/// </summary>
/// <param name="world">The world.</param>
/// <param name="width">The width.</param>
/// <param name="height">The height.</param>
/// <param name="xRadius">The x radius.</param>
/// <param name="yRadius">The y radius.</param>
/// <param name="segments">The segments.</param>
/// <param name="density">The density.</param>
/// <param name="position">The position.</param>
/// <returns></returns>
public static Body CreateRoundedRectangle(World world, FP width, FP height, FP xRadius, FP yRadius, int segments, FP density, FPVector2 position, object userData = null)
{
Vertices verts = PolygonTools.CreateRoundedRectangle(width, height, xRadius, yRadius, segments);
//There are too many vertices in the capsule. We decompose it.
if (verts.Count >= Settings.MaxPolygonVertices)
{
List <Vertices> vertList = Triangulate.ConvexPartition(verts, TriangulationAlgorithm.Earclip, true, FP.EN3);
Body body = CreateCompoundPolygon(world, vertList, density, userData);
body.Position = position;
return(body);
}
return(CreatePolygon(world, verts, density, null));
}
public static Body CreateGear(World world, FP radius, int numberOfTeeth, FP tipPercentage, FP toothHeight, FP density, object userData = null)
{
Vertices gearPolygon = PolygonTools.CreateGear(radius, numberOfTeeth, tipPercentage, toothHeight);
//Gears can in some cases be convex
if (!gearPolygon.IsConvex())
{
//Decompose the gear:
List <Vertices> list = Triangulate.ConvexPartition(gearPolygon, TriangulationAlgorithm.Earclip, true, FP.EN3);
return(CreateCompoundPolygon(world, list, density, userData));
}
return(CreatePolygon(world, gearPolygon, density, userData));
}
/// <summary>
/// Convert a closed path into a polygon.
/// Convex decomposition is automatically performed.
/// </summary>
/// <param name="path">The path.</param>
/// <param name="body">The body.</param>
/// <param name="density">The density.</param>
/// <param name="subdivisions">The subdivisions.</param>
public static void ConvertPathToPolygon(Path path, Body body, FP density, int subdivisions)
{
if (!path.Closed)
{
throw new Exception("The path must be closed to convert to a polygon.");
}
List <FPVector2> verts = path.GetVertices(subdivisions);
List <Vertices> decomposedVerts = Triangulate.ConvexPartition(new Vertices(verts), TriangulationAlgorithm.Bayazit, true, FP.EN3);
foreach (Vertices item in decomposedVerts)
{
body.CreateFixture(new PolygonShape(item, density));
}
}
/// <summary>
/// Creates a capsule.
/// Note: Automatically decomposes the capsule if it contains too many vertices (controlled by Settings.MaxPolygonVertices)
/// </summary>
/// <returns></returns>
public static Body CreateCapsule(World world, FP height, FP topRadius, int topEdges, FP bottomRadius, int bottomEdges, FP density, FPVector2 position, object userData = null)
{
Vertices verts = PolygonTools.CreateCapsule(height, topRadius, topEdges, bottomRadius, bottomEdges);
Body body;
//There are too many vertices in the capsule. We decompose it.
if (verts.Count >= Settings.MaxPolygonVertices)
{
List <Vertices> vertList = Triangulate.ConvexPartition(verts, TriangulationAlgorithm.Earclip, true, FP.EN3);
body = CreateCompoundPolygon(world, vertList, density, userData);
body.Position = position;
return(body);
}
body = CreatePolygon(world, verts, density, userData);
body.Position = position;
return(body);
}
private void GenerateTerrain(int gx, int gy)
{
FP ax = gx * CellSize;
FP ay = gy * CellSize;
List <Vertices> polys = MarchingSquares.DetectSquares(new AABB(new FPVector2(ax, ay), new FPVector2(ax + CellSize, ay + CellSize)), SubCellSize, SubCellSize, _terrainMap, Iterations, true);
if (polys.Count == 0)
{
return;
}
_bodyMap[gx, gy] = new List <Body>();
// create the scale vector
FPVector2 scale = new FPVector2(1f / PointsPerUnit, 1f / -PointsPerUnit);
// create physics object for this grid cell
foreach (Vertices item in polys)
{
// does this need to be negative?
item.Scale(ref scale);
item.Translate(ref _topLeft);
Vertices simplified = SimplifyTools.CollinearSimplify(item, FP.Zero);
List <Vertices> decompPolys = Triangulate.ConvexPartition(simplified, Decomposer, true, FP.EN3);
foreach (Vertices poly in decompPolys)
{
if (poly.Count > 2)
{
_bodyMap[gx, gy].Add(BodyFactory.CreatePolygon(World, poly, 1, null));
}
}
}
}
