A flexible charting library for .NET

//============================================================================
//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
//=============================================================================

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

namespace ZedGraph
{
	/// <summary>
	/// Encapsulates a bar type that displays vertical or horizontal bars
	/// </summary>
	/// <remarks>
	/// The orientation of the bars depends on the state of
	/// <see cref="BarSettings.Base"/>, and the bars can be stacked or
	/// clustered, depending on the state of <see cref="BarSettings.Type"/>
	/// </remarks>
	/// <author> John Champion </author>
	/// <version> $Revision: 3.22 $ $Date: 2007/01/21 07:49:05 $ </version>
	[Serializable]
	public class BarItem : CurveItem, ICloneable, ISerializable
	{
	#region Fields
		/// <summary>
		/// Private field that stores a reference to the <see cref="ZedGraph.Bar"/>
		/// class defined for this <see cref="BarItem"/>.  Use the public
		/// property <see cref="Bar"/> to access this value.
		/// </summary>
		protected Bar			_bar;
	#endregion
	
	#region Properties
		/// <summary>
		/// Gets a reference to the <see cref="ZedGraph.Bar"/> class defined
		/// for this <see cref="BarItem"/>.
		/// </summary>
		public Bar Bar
		{
			get { return _bar; }
		}

		/// <summary>
		/// Gets a flag indicating if the Z data range should be included in the axis scaling calculations.
		/// </summary>
		/// <param name="pane">The parent <see cref="GraphPane" /> of this <see cref="CurveItem" />.
		/// </param>
		/// <value>true if the Z data are included, false otherwise</value>
		override internal bool IsZIncluded( GraphPane pane )
		{
			return pane._barSettings.Type == BarType.ClusterHiLow;
		}

		/// <summary>
		/// Gets a flag indicating if the X axis is the independent axis for this <see cref="CurveItem" />
		/// </summary>
		/// <param name="pane">The parent <see cref="GraphPane" /> of this <see cref="CurveItem" />.
		/// </param>
		/// <value>true if the X axis is independent, false otherwise</value>
		override internal bool IsXIndependent( GraphPane pane )
		{
			return pane._barSettings.Base == BarBase.X;
		}
		
	#endregion
	
	#region Constructors
		/// <summary>
		/// Create a new <see cref="BarItem"/>, specifying only the legend label for the bar.
		/// </summary>
		/// <param name="label">The label that will appear in the legend.</param>
		public BarItem( string label ) : base( label )
		{
			_bar = new Bar();
		}
		/// <summary>
		/// Create a new <see cref="BarItem"/> using the specified properties.
		/// </summary>
		/// <param name="label">The label that will appear in the legend.</param>
		/// <param name="x">An array of double precision values that define
		/// the independent (X axis) values for this curve</param>
		/// <param name="y">An array of double precision values that define
		/// the dependent (Y axis) values for this curve</param>
		/// <param name="color">A <see cref="Color"/> value that will be applied to
		/// the <see cref="ZedGraph.Bar.Fill"/> and <see cref="ZedGraph.Bar.Border"/> properties.
		/// </param>
		public BarItem( string label, double[] x, double[] y, Color color )
			: this( label, new PointPairList( x, y ), color )
		{
		}

		/// <summary>
		/// Create a new <see cref="BarItem"/> using the specified properties.
		/// </summary>
		/// <param name="label">The label that will appear in the legend.</param>
		/// <param name="points">A <see cref="IPointList"/> of double precision value pairs that define
		/// the X and Y values for this curve</param>
		/// <param name="color">A <see cref="Color"/> value that will be applied to
		/// the <see cref="ZedGraph.Bar.Fill"/> and <see cref="ZedGraph.Bar.Border"/> properties.
		/// </param>
		public BarItem( string label, IPointList points, Color color )
			: base( label, points )
		{
			_bar = new Bar( color );
		}
		
		/// <summary>
		/// The Copy Constructor
		/// </summary>
		/// <param name="rhs">The <see cref="BarItem"/> object from which to copy</param>
		public BarItem( BarItem rhs ) : base( rhs )
		{
			//bar = new Bar( rhs.Bar );
			_bar = rhs._bar.Clone();
		}

		/// <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 BarItem Clone()
		{
			return new BarItem( 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 BarItem( 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" );

			_bar = (Bar) info.GetValue( "bar", typeof(Bar) );
		}
		/// <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( "bar", _bar );
		}
	#endregion

	#region Methods
		/// <summary>
		/// Do all rendering associated with this <see cref="BarItem"/> to the specified
		/// <see cref="Graphics"/> device.  This method is normally only
		/// called by the Draw method of the parent <see cref="ZedGraph.CurveList"/>
		/// collection object.
		/// </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="ZedGraph.GraphPane"/> object that is the parent or
		/// owner of this object.
		/// </param>
		/// <param name="pos">The ordinal position of the current <see cref="Bar"/>
		/// curve.</param>
		/// <param name="scaleFactor">
		/// The scaling factor to be used for rendering objects.  This is calculated and
		/// passed down by the parent <see cref="ZedGraph.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 public void Draw( Graphics g, GraphPane pane, int pos,
									float scaleFactor  )
		{
			// Pass the drawing onto the bar class
			if ( _isVisible )
				_bar.DrawBars( g, pane, this, BaseAxis( pane ), ValueAxis( pane ),
								this.GetBarWidth( pane ), pos, scaleFactor );
		}
		
		/// <summary>
		/// Draw a legend key entry for this <see cref="BarItem"/> at the specified location
		/// </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="ZedGraph.GraphPane"/> object that is the parent or
        /// owner of this object.
        /// </param>
        /// <param name="rect">The <see cref="RectangleF"/> struct that specifies the
        /// location for the legend key</param>
		/// <param name="scaleFactor">
		/// The scaling factor to be used for rendering objects.  This is calculated and
		/// passed down by the parent <see cref="ZedGraph.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 public void DrawLegendKey( Graphics g, GraphPane pane, RectangleF rect, float scaleFactor )
		{
			_bar.Draw( g, pane, rect, scaleFactor, true, false, null );
		}

		/// <summary>
		/// Create a <see cref="TextObj" /> for each bar in the <see cref="GraphPane" />.
		/// </summary>
		/// <remarks>
		/// This method will go through the bars, create a label that corresponds to the bar value,
		/// and place it on the graph depending on user preferences.  This works for horizontal or
		/// vertical bars in clusters or stacks, but only for <see cref="BarItem" /> types.  This method
		/// does not apply to <see cref="ErrorBarItem" /> or <see cref="HiLowBarItem" /> objects.
		/// Call this method only after calling <see cref="GraphPane.AxisChange" />.
		/// </remarks>
		/// <param name="pane">The GraphPane in which to place the text labels.</param>
		/// <param name="isBarCenter">true to center the labels inside the bars, false to
		/// place the labels just above the top of the bar.</param>
		/// <param name="valueFormat">The double.ToString string format to use for creating
		/// the labels.
		/// </param>
		public static void CreateBarLabels( GraphPane pane, bool isBarCenter, string valueFormat )
		{
			CreateBarLabels( pane, isBarCenter, valueFormat, TextObj.Default.FontFamily,
					TextObj.Default.FontSize, TextObj.Default.FontColor, TextObj.Default.FontBold,
					TextObj.Default.FontItalic, TextObj.Default.FontUnderline );
		}

		/// <summary>
		/// Create a <see cref="TextObj" /> for each bar in the <see cref="GraphPane" />.
		/// </summary>
		/// <remarks>
		/// This method will go through the bars, create a label that corresponds to the bar value,
		/// and place it on the graph depending on user preferences.  This works for horizontal or
		/// vertical bars in clusters or stacks, but only for <see cref="BarItem" /> types.  This method
		/// does not apply to <see cref="ErrorBarItem" /> or <see cref="HiLowBarItem" /> objects.
		/// Call this method only after calling <see cref="GraphPane.AxisChange" />.
		/// </remarks>
		/// <param name="pane">The GraphPane in which to place the text labels.</param>
		/// <param name="isBarCenter">true to center the labels inside the bars, false to
		/// place the labels just above the top of the bar.</param>
		/// <param name="valueFormat">The double.ToString string format to use for creating
		/// the labels.
		/// </param>
		/// <param name="fontColor">The color in which to draw the labels</param>
		/// <param name="fontFamily">The string name of the font family to use for the labels</param>
		/// <param name="fontSize">The floating point size of the font, in scaled points</param>
		/// <param name="isBold">true for a bold font type, false otherwise</param>
		/// <param name="isItalic">true for an italic font type, false otherwise</param>
		/// <param name="isUnderline">true for an underline font type, false otherwise</param>
		public static void CreateBarLabels( GraphPane pane, bool isBarCenter, string valueFormat,
			string fontFamily, float fontSize, Color fontColor, bool isBold, bool isItalic,
			bool isUnderline )
		{
			bool isVertical = pane.BarSettings.Base == BarBase.X;

			// Make the gap between the bars and the labels = 2% of the axis range
			float labelOffset;
			if ( isVertical )
				labelOffset = (float)( pane.YAxis._scale._max - pane.YAxis._scale._min ) * 0.015f;
			else
				labelOffset = (float)( pane.XAxis._scale._max - pane.XAxis._scale._min ) * 0.015f;

			// keep a count of the number of BarItems
			int curveIndex = 0;

			// Get a valuehandler to do some calculations for us
			ValueHandler valueHandler = new ValueHandler( pane, true );

			// Loop through each curve in the list
			foreach ( CurveItem curve in pane.CurveList )
			{
				// work with BarItems only
				BarItem bar = curve as BarItem;
				if ( bar != null )
				{
					IPointList points = curve.Points;

					// Loop through each point in the BarItem
					for ( int i = 0; i < points.Count; i++ )
					{
						// Get the high, low and base values for the current bar
						// note that this method will automatically calculate the "effective"
						// values if the bar is stacked
						double baseVal, lowVal, hiVal;
						valueHandler.GetValues( curve, i, out baseVal, out lowVal, out hiVal );

						// Get the value that corresponds to the center of the bar base
						// This method figures out how the bars are positioned within a cluster
						float centerVal = (float)valueHandler.BarCenterValue( bar,
							bar.GetBarWidth( pane ), i, baseVal, curveIndex );

						// Create a text label -- note that we have to go back to the original point
						// data for this, since hiVal and lowVal could be "effective" values from a bar stack
						string barLabelText = ( isVertical ? points[i].Y : points[i].X ).ToString( valueFormat );

						// Calculate the position of the label -- this is either the X or the Y coordinate
						// depending on whether they are horizontal or vertical bars, respectively
						float position;
						if ( isBarCenter )
							position = (float)( hiVal + lowVal ) / 2.0f;
						else if ( hiVal >= 0 )
							position = (float)hiVal + labelOffset;
						else
							position = (float)hiVal - labelOffset;

						// Create the new TextObj
						TextObj label;
						if ( isVertical )
							label = new TextObj( barLabelText, centerVal, position );
						else
							label = new TextObj( barLabelText, position, centerVal );

						label.FontSpec.Family = fontFamily;
						// Configure the TextObj
						label.Location.CoordinateFrame = CoordType.AxisXYScale;
						label.FontSpec.Size = fontSize;
						label.FontSpec.FontColor = fontColor;
						label.FontSpec.IsItalic = isItalic;
						label.FontSpec.IsBold = isBold;
						label.FontSpec.IsUnderline = isUnderline;

						label.FontSpec.Angle = isVertical ? 90 : 0;
						label.Location.AlignH = isBarCenter ? AlignH.Center :
									( hiVal >= 0 ? AlignH.Left : AlignH.Right );
						label.Location.AlignV = AlignV.Center;
						label.FontSpec.Border.IsVisible = false;
						label.FontSpec.Fill.IsVisible = false;

						// Add the TextObj to the GraphPane
						pane.GraphObjList.Add( label );
					}
					curveIndex++;
				}
			}
		}

		/// <summary>
		/// Determine the coords for the rectangle associated with a specified point for 
		/// this <see cref="CurveItem" />
		/// </summary>
		/// <param name="pane">The <see cref="GraphPane" /> to which this curve belongs</param>
		/// <param name="i">The index of the point of interest</param>
		/// <param name="coords">A list of coordinates that represents the "rect" for
		/// this point (used in an html AREA tag)</param>
		/// <returns>true if it's a valid point, false otherwise</returns>
		override public bool GetCoords( GraphPane pane, int i, out string coords )
		{
			coords = string.Empty;

			if ( i < 0 || i >= _points.Count )
				return false;

			Axis valueAxis = ValueAxis( pane );
			Axis baseAxis = BaseAxis( pane );

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

			float clusterWidth = pane.BarSettings.GetClusterWidth();
			float barWidth = GetBarWidth( pane );
			float clusterGap = pane._barSettings.MinClusterGap * barWidth;
			float barGap = barWidth * pane._barSettings.MinBarGap;

			// curBase = the scale value on the base axis of the current bar
			// curHiVal = the scale value on the value axis of the current bar
			// curLowVal = the scale value of the bottom of the bar
			double curBase, curLowVal, curHiVal;
			ValueHandler valueHandler = new ValueHandler( pane, false );
			valueHandler.GetValues( this, i, out curBase, out curLowVal, out curHiVal );

			// 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 ( !_points[i].IsInvalid3D )
			{
				// calculate a pixel value for the top of the bar on value axis
				pixLowVal = valueAxis.Scale.Transform( _isOverrideOrdinal, i, curLowVal );
				pixHiVal = valueAxis.Scale.Transform( _isOverrideOrdinal, i, curHiVal );
				// calculate a pixel value for the center of the bar on the base axis
				pixBase = baseAxis.Scale.Transform( _isOverrideOrdinal, i, curBase );

				// Calculate the pixel location for the side of the bar (on the base axis)
				float pixSide = pixBase - clusterWidth / 2.0F + clusterGap / 2.0F +
								pane.CurveList.GetBarItemPos( pane, this ) * ( barWidth + barGap );

				// Draw the bar
				if ( pane._barSettings.Base == BarBase.X )
					coords = String.Format( "{0:f0},{1:f0},{2:f0},{3:f0}",
								pixSide, pixLowVal,
								pixSide + barWidth, pixHiVal );
				else
					coords = String.Format( "{0:f0},{1:f0},{2:f0},{3:f0}",
								pixLowVal, pixSide,
								pixHiVal, pixSide + barWidth );

				return true;
			}

			return false;
		}

	#endregion
	}
}