/// <summary>
/// Function to add a vertex to the polysprite.
/// </summary>
/// <param name="vertex">The vertex to add.</param>
/// <returns>The fluent interface for this builder.</returns>
/// <exception cref="ArgumentNullException">Thrown when the <paramref name="vertex"/> is <b>null</b>.</exception>
public GorgonPolySpriteBuilder AddVertex(GorgonPolySpriteVertex vertex)
{
if (vertex == null)
{
throw new ArgumentNullException(nameof(vertex));
}
_workingSprite.RwVertices.Add(vertex);
return(this);
}
/// <summary>
/// Function to insert a vertex at the specified index.
/// </summary>
/// <param name="index">The index to insert into.</param>
/// <param name="vertex">The vertex to insert.</param>
/// <returns>The fluent interface for the this builder.</returns>
/// <exception cref="ArgumentNullException">Thrown when the <paramref name=" vertex"/> parameter is <b>null</b>.</exception>
public GorgonPolySpriteBuilder InsertVertex(int index, GorgonPolySpriteVertex vertex)
{
if (vertex == null)
{
throw new ArgumentNullException(nameof(vertex));
}
_workingSprite.RwVertices.Insert(index, vertex);
return(this);
}
/// <summary>
/// Function to move the specified vertex to a new location in the list.
/// </summary>
/// <param name="vertex">The vertex to move.</param>
/// <param name="newIndex">The new index for the vertex.</param>
/// <returns>The fluent interface for the this builder.</returns>
/// <exception cref="ArgumentNullException">Thrown when the <paramref name="vertex"/> parameter is <b>null</b>.</exception>
public GorgonPolySpriteBuilder MoveVertex(GorgonPolySpriteVertex vertex, int newIndex)
{
if (vertex == null)
{
throw new ArgumentNullException(nameof(vertex));
}
int index = _workingSprite.RwVertices.IndexOf(vertex);
return(index == -1 ? this : MoveVertex(index, newIndex));
}
/// <summary>
/// Function to move the vertex at the specified index to a new location in the list.
/// </summary>
/// <param name="oldIndex">The index of the vertex to move.</param>
/// <param name="newIndex">The new index for the vertex.</param>
/// <returns>The fluent interface for the this builder.</returns>
public GorgonPolySpriteBuilder MoveVertex(int oldIndex, int newIndex)
{
oldIndex = oldIndex.Max(0).Min(_workingSprite.RwVertices.Count - 1);
newIndex = newIndex.Max(0).Min(_workingSprite.RwVertices.Count);
if (newIndex == oldIndex)
{
return(this);
}
GorgonPolySpriteVertex pass = _workingSprite.RwVertices[oldIndex];
_workingSprite.RwVertices[oldIndex] = null;
_workingSprite.RwVertices.Insert(newIndex, pass);
_workingSprite.RwVertices.Remove(null);
return(this);
}