public string GetWeight(string vertexToName)
{
if (Name == vertexToName && Edges.All(e => e.VertexTo.Name != vertexToName))
{
return(string.Empty);
}
return(Edges.First(e => e.VertexTo.Name == vertexToName).GetWeightString());
}
/// <summary>
/// Determines whether the mesh is a valid triangle mesh.
/// </summary>
/// <returns>
/// <see langword="true"/> if the mesh is a valid triangle mesh; otherwise,
/// <see langword="false"/>.
/// </returns>
/// <remarks>
/// <para>
/// This method checks if the mesh consists only of triangle faces without edges or vertices
/// that are not connected to a face.
/// </para>
/// <para>
/// This method does not check whether the mesh <see cref="IsValid()"/>.
/// </para>
/// </remarks>
public bool IsTriangleMesh()
{
if (Vertices.Count > 0 && Faces.Count == 0)
{
return(false);
}
return(Faces.All(f => f.Holes == null) && // No holes allowed.
Edges.All(e => e.Face == null ||
e.Next != null && // Face boundary consists of exactly 3 edges.
e.Next.Next == e.Previous &&
e.Next != e.Previous));
}
/// <summary>
/// Determines whether this mesh is a closed mesh.
/// </summary>
/// <returns>
/// <see langword="true"/> if this instance is a closed mesh; otherwise, <see langword="false"/>.
/// </returns>
/// <remarks>
/// <para>
/// In a closed mesh all edges are connected to 2 faces. For example: The mesh of a sphere is a
/// closed mesh. An object with holes, like a pullover, is not closed. A flat object, like a
/// curtain, is closed if both sides are modeled with faces. It is not closed if only a one side
/// is modeled with faces. (A single vertex is considered as closed. A single edge-pair is also
/// considered as closed.)
/// </para>
/// <para>
/// This method does not check whether the mesh <see cref="IsValid()"/>.
/// </para>
/// </remarks>
public bool IsClosed()
{
// Empty mesh is not closed.
if (Vertex == null)
{
return(false);
}
// A single edge-pair is closed.
if (Faces.Count == 0 && Edges.Count <= 2)
{
return(true);
}
return(Faces.All(f => f.Holes == null) && // No holes allowed.
Edges.All(e => e.Face != null && // Faces on both sides of the edge.
e.Twin != null &&
e.Twin.Face != null));
}
/// <summary>
/// Defines the face curvature. Depends on DefineEdgeAngle
/// </summary>
public void DefineFaceCurvature()
{
if (Edges.Any(e => e == null || e.Curvature == CurvatureType.Undefined))
{
Curvature = CurvatureType.Undefined;
}
else if (Edges.All(e => e.Curvature != CurvatureType.Concave))
{
Curvature = CurvatureType.Convex;
}
else if (Edges.All(e => e.Curvature != CurvatureType.Convex))
{
Curvature = CurvatureType.Concave;
}
else
{
Curvature = CurvatureType.SaddleOrFlat;
}
}
/// <summary>
/// Defines vertex curvature
/// </summary>
private void DefineCurvature()
{
if (Edges.Any(e => e.Curvature == CurvatureType.Undefined))
{
_curvature = CurvatureType.Undefined;
}
else if (Edges.All(e => e.Curvature == CurvatureType.SaddleOrFlat))
{
_curvature = CurvatureType.SaddleOrFlat;
}
else if (Edges.Any(e => e.Curvature != CurvatureType.Convex))
{
_curvature = CurvatureType.Concave;
}
else if (Edges.Any(e => e.Curvature != CurvatureType.Concave))
{
_curvature = CurvatureType.Convex;
}
else
{
_curvature = CurvatureType.SaddleOrFlat;
}
}
// TODO: Add error messages to IsXxx method, so that users see where the problem is.
/// <summary>
/// Gets a value indicating whether the tags of all components in the mesh are equal to the
/// given tag value.
/// </summary>
/// <param name="tag">The reference tag value.</param>
/// <returns>
/// <see langword="true"/> if the tags of all components are equal to <paramref name="tag"/>;
/// otherwise, <see langword="false"/>.
/// </returns>
public bool AreTagsEqualTo(int tag)
{
return(Vertices.All(vertex => vertex.Tag == tag) &&
Edges.All(edge => edge.Tag == tag) &&
Faces.All(face => face.Tag == tag));
}
