//============================================================================
//ZedGraph Class Library - A Flexible Line Graph/Bar Graph Library in C#
//Copyright © 2004  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
//=============================================================================

#region Using directives

using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Text;
using System.Runtime.Serialization;
using System.Security.Permissions;

#endregion

namespace DrawGraph
{
	/// <summary>
	/// This class handles the drawing of the curve <see cref="HiLowBar"/> objects.
	/// The Hi-Low Bars are the "floating" bars that have a lower and upper value and
	/// appear at each defined point.
	/// </summary>
	/// 
	/// <author> John Champion </author>
	/// <version> $Revision: 3.17 $ $Date: 2007/04/16 00:03:02 $ </version>
	[Serializable]
	public class HiLowBar : Bar, ICloneable, ISerializable
	{

	#region Fields
		/// <summary>
		/// Private field that stores the size (width) of this
        /// <see cref="HiLowBar"/> in points (1/72 inch).  Use the public
        /// property <see cref="Size"/> to access this value.
		/// </summary>
		private float		_size;

		/// <summary>
		/// Private field that determines whether the bar width will be based on
		/// the <see cref="Size"/> value, or it will be based on available
		/// space similar to <see cref="BarItem"/> objects.  Use the public property
		/// <see cref="IsAutoSize"/> to access this value.
		/// </summary>
		private bool _isAutoSize;

		/// <summary>
		/// The result of the autosize calculation, which is the size of the bars in
		/// user scale units.  This is converted to pixels at draw time.
		/// </summary>
		internal double _userScaleSize = 1.0;

	#endregion

	#region Default
		/// <summary>
		/// A simple struct that defines the
		/// default property values for the <see cref="ZedGraph.HiLowBar"/> class.
		/// </summary>
		new public struct Default
		{
			// Default HiLowBar properties
			/// <summary>
			/// The default size (width) for the bars (<see cref="HiLowBar.Size"/> property),
			/// in units of points.
			/// </summary>
			public static float Size = 7;

			/// <summary>
			/// Default value for the <see cref="HiLowBar.IsAutoSize" /> property.
			/// </summary>
			public static bool IsAutoSize = true;
		}
	#endregion

	#region Constructors
		/// <summary>
		/// Default constructor that sets all <see cref="HiLowBar"/> properties to default
		/// values as defined in the <see cref="Bar.Default"/> class.
		/// </summary>
		public HiLowBar() : this( Color.Empty )
		{
		}

		/// <summary>
		/// Default constructor that sets the 
		/// <see cref="Color"/> as specified, and the remaining
		/// <see cref="HiLowBar"/> properties to default
		/// values as defined in the <see cref="Bar.Default"/> class.
		/// The specified color is only applied to the
		/// <see cref="ZedGraph.Fill.Color"/>, and the <see cref="ZedGraph.LineBase.Color"/>
		/// will be defaulted.
		/// </summary>
		/// <param name="color">A <see cref="Color"/> value indicating
		/// the <see cref="ZedGraph.Fill.Color"/>
		/// of the Bar.
		/// </param>
		public HiLowBar( Color color ) : this( color, Default.Size )
		{
		}

		/// <summary>
		/// Default constructor that sets the 
		/// <see cref="Color"/> and <see cref="Size"/> as specified, and the remaining
		/// <see cref="HiLowBar"/> properties to default
		/// values as defined in the <see cref="Bar.Default"/> class.
		/// The specified color is only applied to the
		/// <see cref="ZedGraph.Fill.Color"/>, and the <see cref="ZedGraph.LineBase.Color"/>
		/// will be defaulted.
		/// </summary>
		/// <param name="color">A <see cref="Color"/> value indicating
		/// the <see cref="ZedGraph.Fill.Color"/>
		/// of the Bar.
		/// </param>
		/// <param name="size">The size (width) of the <see cref="HiLowBar"/>'s, in points
		/// (1/72nd inch)</param>
		public HiLowBar( Color color, float size ) : base( color )
		{
			_size = size;
			_isAutoSize = Default.IsAutoSize;
		}

		/// <summary>
		/// The Copy Constructor
		/// </summary>
		/// <param name="rhs">The <see cref="HiLowBar"/> object from which to copy</param>
		public HiLowBar( HiLowBar rhs ) : base( rhs )
		{
			_size = rhs._size;
			_isAutoSize = rhs._isAutoSize;
		}

		/// <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>
		new public HiLowBar Clone()
		{
			return new HiLowBar( this );
		}

	#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 HiLowBar( 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 sch = info.GetInt32( "schema2" );

			_size = info.GetSingle( "size" );
			_isAutoSize = info.GetBoolean( "isAutoSize" );
		}
		/// <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( "size", _size );
			info.AddValue( "isAutoSize", _isAutoSize );
		}
	#endregion

	#region Properties
		/// <summary>
		/// Gets or sets the size of the <see cref="HiLowBar"/>
		/// </summary>
		/// <remarks>The size of the bars can be set by this value, which
		/// is then scaled according to the scaleFactor (see
		/// <see cref="PaneBase.CalcScaleFactor"/>).  Alternatively,
		/// if <see cref="IsAutoSize"/> is true, the bar width will
		/// be set according to the maximum available cluster width less
		/// the cluster gap (see <see cref="BarSettings.GetClusterWidth"/>
		/// and <see cref="BarSettings.MinClusterGap"/>).  That is, if
		/// <see cref="IsAutoSize"/> is true, then the value of
		/// <see cref="Size"/> will be ignored.  If you modify the value of Size,
		/// then <see cref="IsAutoSize" /> will be automatically set to false.
		/// </remarks>
      /// <value>Size in points (1/72 inch)</value>
      /// <seealso cref="Default.Size"/>
		public float Size
		{
			get { return _size; }
			set { _size = value; _isAutoSize = false; }
		}

		/// <summary>
		/// Determines whether the bar width will be based on
		/// the <see cref="Size"/> value, or it will be based on available
		/// space similar to <see cref="BarItem"/> objects.
		/// </summary>
		/// <remarks>If true, then the value of <see cref="Size"/> is ignored. 
		/// If this value is true, then <see cref="BarSettings.MinClusterGap"/> will be used to
		/// determine the total space between each bar.  If the base axis is non-ordinal, then
		/// <see cref="BarSettings.ClusterScaleWidth" /> will be active.  In this case, you may
		/// want to make sure that <see cref="BarSettings.ClusterScaleWidthAuto" /> is true.
		/// </remarks>
		public bool IsAutoSize
		{
			get { return _isAutoSize; }
			set { _isAutoSize = value; }
		}
	#endregion

	#region Methods
		/// <summary>
		/// Protected internal routine that draws the specified single bar (an individual "point")
		/// of this series to the specified <see cref="Graphics"/> device.
		/// </summary>
		/// <param name="g">
		/// A graphic device object to be drawn into.  This is normally e.Graphics from the
		/// PaintEventArgs argument to the Paint() method.
		/// </param>
		/// <param name="pane">
		/// A reference to the <see cref="GraphPane"/> object that is the parent or
		/// owner of this object.
		/// </param>
		/// <param name="curve">A <see cref="CurveItem"/> object representing the
		/// <see cref="Bar"/>'s to be drawn.</param>
		/// <param name="index">
		/// The zero-based index number for the single bar to be drawn.
		/// </param>
		/// <param name="pos">
		/// The ordinal position of the this bar series (0=first bar, 1=second bar, etc.)
		/// in the cluster of bars.
		/// </param>
		/// <param name="baseAxis">The <see cref="Axis"/> class instance that defines the base (independent)
		/// axis for the <see cref="Bar"/></param>
		/// <param name="valueAxis">The <see cref="Axis"/> class instance that defines the value (dependent)
		/// axis for the <see cref="Bar"/></param>
		/// <param name="barWidth">
		/// The width of each bar, in pixels.
		/// </param>
		/// <param name="scaleFactor">
		/// The scaling factor to be used for rendering objects.  This is calculated and
		/// passed down by the parent <see cref="GraphPane"/> object using the
		/// <see cref="PaneBase.CalcScaleFactor"/> method, and is used to proportionally adjust
		/// font sizes, etc. according to the actual size of the graph.
		/// </param>
		override protected void DrawSingleBar( Graphics g, GraphPane pane,
							CurveItem curve,
							int index, int pos, Axis baseAxis, Axis valueAxis,
							float barWidth, float scaleFactor )
		{
			//float	scaledSize = GetBarWidth( pane, baseAxis, scaleFactor );

			// pixBase = pixel value for the bar center on the base axis
			// pixValue = pixel value for the bar top on the value axis
			// pixLow = pixel value for the bar bottom on the value axis
			float pixBase, pixHiVal, pixLowVal;

			// curBase = the scale value on the base axis of the current bar
			// curValue = the scale value on the value axis of the current bar

			double curBase, curLowVal, curHiVal;
			ValueHandler valueHandler = new ValueHandler( pane, false );
			valueHandler.GetValues( curve, index, out curBase,
					out curLowVal, out curHiVal );

			barWidth = GetBarWidth( pane, baseAxis, scaleFactor );

			// curLow = the scale value on the value axis for the bottom of the current bar
			// Get a "low" value for the bottom of the bar and verify validity

			if (	curLowVal == PointPair.Missing ||
					System.Double.IsNaN( curLowVal ) ||
					System.Double.IsInfinity( curLowVal ) )
				curLowVal = 0;

			// Any value set to double max is invalid and should be skipped
			// This is used for calculated values that are out of range, divide
			//   by zero, etc.
			// Also, any value <= zero on a log scale is invalid

			if ( !curve.Points[index].IsInvalid )
			{
				// calculate a pixel value for the top of the bar on value axis
				pixHiVal = valueAxis.Scale.Transform( curve.IsOverrideOrdinal, index, curHiVal );
				// calculate a pixel value for the center of the bar on the base axis
				pixBase = baseAxis.Scale.Transform( curve.IsOverrideOrdinal, index, curBase );

				pixLowVal = valueAxis.Scale.Transform( curve.IsOverrideOrdinal, index, curLowVal );

				// Calculate the pixel location for the side of the bar (on the base axis)
				float pixSide = pixBase - barWidth / 2.0F;

				// Draw the bar
				if ( baseAxis is XAxis || baseAxis is X2Axis )
					this.Draw( g, pane, pixSide, pixSide + barWidth, pixLowVal,
								pixHiVal, scaleFactor, true, curve.IsSelected,
								curve.Points[index] );
				else
					this.Draw( g, pane, pixLowVal, pixHiVal, pixSide, pixSide + barWidth,
								scaleFactor, true, curve.IsSelected,
								curve.Points[index] );
		   }
	   }
		
		/// <summary>
		/// Returns the width of the bar, in pixels, based on the settings for
		/// <see cref="Size"/> and <see cref="IsAutoSize"/>.
		/// </summary>
		/// <param name="pane">The parent <see cref="GraphPane"/> object.</param>
		/// <param name="baseAxis">The <see cref="Axis"/> object that
		/// represents the bar base (independent axis).</param>
		/// <param name="scaleFactor">
		/// The scaling factor to be used for rendering objects.  This is calculated and
		/// passed down by the parent <see cref="GraphPane"/> object using the
		/// <see cref="PaneBase.CalcScaleFactor"/> method, and is used to proportionally adjust
		/// font sizes, etc. according to the actual size of the graph.
		/// </param>
		/// <returns>The width of each bar, in pixel units</returns>
		public float GetBarWidth( GraphPane pane, Axis baseAxis, float scaleFactor )
		{
			float width;

			if ( _isAutoSize )
				width = baseAxis._scale.GetClusterWidth( _userScaleSize ) /
								( 1.0F + pane._barSettings.MinClusterGap );
			else
				width = (float) ( _size * scaleFactor );

			// use integral size
			return (int)( width + 0.5f );
		}
		

	#endregion

	}
}