/// <summary>
/// Replaces two vertices.
/// </summary>
/// <param name="previousVertex">The vertex to replace.</param>
/// <param name="newVertex">The new vertex.</param>
/// <returns>true when vertex was replaced, false otherwise.</returns>
public bool Replace(Vertex previousVertex, Vertex newVertex)
{
if (Contains(previousVertex) && Contains(newVertex))
{
return(false);
}
if (Vertex1 == previousVertex && Vertex2 == previousVertex)
{
Vertex1.RemoveTriangle(this);
return(false);
}
if (Vertex2 == previousVertex && Vertex3 == previousVertex)
{
Vertex1.RemoveTriangle(this);
return(false);
}
if (Vertex1 == previousVertex && Vertex3 == previousVertex)
{
Vertex1.RemoveTriangle(this);
return(false);
}
if (Vertex1 == previousVertex)
{
Vertex1 = newVertex;
Vertex1.AddTriangle(this);
}
else if (Vertex2 == previousVertex)
{
Vertex2 = newVertex;
Vertex2.AddTriangle(this);
}
else if (Vertex3 == previousVertex)
{
Vertex3 = newVertex;
Vertex3.AddTriangle(this);
}
else
{
return(false);
}
Vertex1.Replace(previousVertex, newVertex);
Vertex2.Replace(previousVertex, newVertex);
Vertex3.Replace(previousVertex, newVertex);
m_ReplacedBefore = true;
return(true);
}