/// <summary>
/// Function to add a node as a child to this node.
/// </summary>
/// <param name="dimensions">Dimensions that the node will occupy.</param>
public GlyphNode AddNode(Size dimensions)
{
if (!IsLeaf)
{
GlyphNode node = Left.AddNode(dimensions);
// If we can't add the node to the left, then try the right.
return(node ?? Right.AddNode(dimensions));
}
// Do nothing if there's no more room.
if (_noMoreRoom)
{
return(null);
}
// Ensure we can fit this node.
if ((dimensions.Width > Region.Width) || (dimensions.Height > Region.Height))
{
return(null);
}
// We have an exact fit, so there will be no more room for other nodes.
if ((dimensions.Width == Region.Width) && (dimensions.Height == Region.Height))
{
_noMoreRoom = true;
return(this);
}
Left = new GlyphNode(this);
Right = new GlyphNode(this);
// Subdivide.
var delta = new Size(Region.Width - dimensions.Width, Region.Height - dimensions.Height);
if (delta.Width > delta.Height)
{
Left.Region = new Rectangle(Region.Left, Region.Top, dimensions.Width, Region.Height);
Right.Region = new Rectangle(Region.Left + dimensions.Width, Region.Top, delta.Width, Region.Height);
}
else
{
Left.Region = new Rectangle(Region.Left, Region.Top, Region.Width, dimensions.Height);
Right.Region = new Rectangle(Region.Left, Region.Top + dimensions.Height, Region.Width, delta.Height);
}
return(Left.AddNode(dimensions));
}
/// <summary>
/// Function to add a node to the
/// </summary>
/// <param name="dimensions">The glyph dimensions.</param>
/// <returns>A rectangle for the area on the image that the glyph will be located at, or <b>null</b> if there's no room.</returns>
public static Rectangle? Add(Size dimensions)
{
if ((dimensions.Width > Root.Region.Width) || (dimensions.Height > Root.Region.Height))
{
throw new ArgumentOutOfRangeException(nameof(dimensions), Resources.GORGFX_ERR_FONT_GLYPH_NODE_TOO_LARGE);
}
// Do nothing here.
if ((dimensions.Width == 0) || (dimensions.Height == 0))
{
return Rectangle.Empty;
}
GlyphNode newNode = Root.AddNode(dimensions);
return newNode?.Region;
}
/// <summary>
/// Initializes a new instance of the <see cref="GlyphNode"/> class.
/// </summary>
/// <param name="parentNode">The parent node.</param>
public GlyphNode(GlyphNode parentNode)
{
Region = Rectangle.Empty;
Parent = parentNode;
}
/// <summary>
/// Function to create the root node.
/// </summary>
/// <param name="textureWidth">The width of the texture.</param>
/// <param name="textureHeight">The height of the texture.</param>
public static void CreateRoot(int textureWidth, int textureHeight) => Root = new GlyphNode(null)
{
Region = new Rectangle(0, 0, textureWidth, textureHeight)
};