//============================================================================
//ZedGraph Class Library - A Flexible Line Graph/Bar Graph Library in C#
//Copyright © 2006  John Champion
//
//This library is free software; you can redistribute it and/or
//modify it under the terms of the GNU Lesser General Public
//License as published by the Free Software Foundation; either
//version 2.1 of the License, or (at your option) any later version.
//
//This library is distributed in the hope that it will be useful,
//but WITHOUT ANY WARRANTY; without even the implied warranty of
//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
//Lesser General Public License for more details.
//
//You should have received a copy of the GNU Lesser General Public
//License along with this library; if not, write to the Free Software
//Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//=============================================================================

using System;
using System.Drawing;
using System.Text;
using System.Runtime.Serialization;
using System.Security.Permissions;

namespace ZedGraph
{
	/// <summary>
	/// Class that handles the data associated with a text title and its associated font
	/// properties.  Inherits from <see cref="Label" />, and adds the <see cref="Gap" />
	/// property for use by the <see cref="Axis" /> and <see cref="PaneBase" /> objects.
	/// </summary>
	/// 
	/// <author> John Champion </author>
	/// <version> $Revision: 3.1 $ $Date: 2006/06/24 20:26:44 $ </version>
	[Serializable]
	public class GapLabel : Label, ICloneable, ISerializable
	{
		internal float _gap;

	#region Constructors

		/// <summary>
		/// Constructor to build a <see cref="GapLabel" /> from the text and the
		/// associated font properties.
		/// </summary>
		/// <param name="text">The <see cref="string" /> representing the text to be
		/// displayed</param>
		/// <param name="fontFamily">The <see cref="String" /> font family name</param>
		/// <param name="fontSize">The size of the font in points and scaled according
		/// to the <see cref="PaneBase.CalcScaleFactor" /> logic.</param>
		/// <param name="color">The <see cref="Color" /> instance representing the color
		/// of the font</param>
		/// <param name="isBold">true for a bold font face</param>
		/// <param name="isItalic">true for an italic font face</param>
		/// <param name="isUnderline">true for an underline font face</param>
		public GapLabel( string text, string fontFamily, float fontSize, Color color, bool isBold,
								bool isItalic, bool isUnderline )
			: base( text, fontFamily, fontSize, color, isBold, isItalic, isUnderline )
		{
			_gap = Default.Gap;
		}

		/// <summary>
		/// Copy constructor
		/// </summary>
		/// <param name="rhs">the <see cref="AxisLabel" /> instance to be copied.</param>
		public GapLabel( GapLabel rhs )
			: base( rhs )
		{
			_gap = rhs._gap;
		}

		/// <summary>
		/// Implement the <see cref="ICloneable" /> interface in a typesafe manner by just
		/// calling the typed version of <see cref="Clone" />
		/// </summary>
		/// <returns>A deep copy of this object</returns>
		object ICloneable.Clone()
		{
			return this.Clone();
		}

		/// <summary>
		/// Typesafe, deep-copy clone method.
		/// </summary>
		/// <returns>A new, independent copy of this class</returns>
		public new GapLabel Clone()
		{
			return new GapLabel( this );
		}

	#endregion

	#region Properties

		/// <summary>
		/// Gets or sets the gap factor between this label and the opposing <see cref="Axis" />
		/// or <see cref="Chart" />.
		/// </summary>
		/// <remarks>
		/// This value is expressed as a fraction of the character height for the <see cref="GapLabel" />.
		/// </remarks>
		public float Gap
		{
			get { return _gap; }
			set { _gap = value; }
		}

		/// <summary>
		/// Calculate the size of the <see cref="Gap" /> based on the <see cref="Label.FontSpec" />
		/// height, in pixel units and scaled according to <see paramref="scalefactor" />.
		/// </summary>
		/// <param name="scaleFactor">The scaling factor to be applied</param>
		public float GetScaledGap( float scaleFactor )
		{
			return _fontSpec.GetHeight( scaleFactor ) * _gap;
		}

	#endregion

	#region Serialization

		/// <summary>
		/// Current schema value that defines the version of the serialized file
		/// </summary>
		public const int schema2 = 10;

		/// <summary>
		/// Constructor for deserializing objects
		/// </summary>
		/// <param name="info">A <see cref="SerializationInfo"/> instance that defines the serialized data
		/// </param>
		/// <param name="context">A <see cref="StreamingContext"/> instance that contains the serialized data
		/// </param>
		protected GapLabel( SerializationInfo info, StreamingContext context )
			: base( info, context )
		{
			// The schema value is just a file version parameter.  You can use it to make future versions
			// backwards compatible as new member variables are added to classes
			int sch2 = info.GetInt32( "schema2" );

			_gap = info.GetSingle( "gap" );
		}
		/// <summary>
		/// Populates a <see cref="SerializationInfo"/> instance with the data needed to serialize the target object
		/// </summary>
		/// <param name="info">A <see cref="SerializationInfo"/> instance that defines the serialized data</param>
		/// <param name="context">A <see cref="StreamingContext"/> instance that contains the serialized data</param>
		[SecurityPermissionAttribute( SecurityAction.Demand, SerializationFormatter = true )]
		public override void GetObjectData( SerializationInfo info, StreamingContext context )
		{
			base.GetObjectData( info, context );

			info.AddValue( "schema2", schema2 );
			info.AddValue( "gap", _gap );
		}
	#endregion

	#region Default
		/// <summary>
		/// A simple struct that defines the
		/// default property values for the <see cref="GapLabel"/> class.
		/// </summary>
		public struct Default
		{
			/// <summary>
			/// The default <see cref="GapLabel.Gap" /> setting.
			/// </summary>
			public static float Gap = 0.3f;
		}
	#endregion


	}
}