234 lines
9.1 KiB
C#
234 lines
9.1 KiB
C#
//============================================================================
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//ZedGraph Class Library - A Flexible Line Graph/Bar Graph Library in C#
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//Copyright ?2005 John Champion
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//
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//This library is free software; you can redistribute it and/or
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//modify it under the terms of the GNU Lesser General Public
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//License as published by the Free Software Foundation; either
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//version 2.1 of the License, or (at your option) any later version.
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//
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//This library is distributed in the hope that it will be useful,
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//but WITHOUT ANY WARRANTY; without even the implied warranty of
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//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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//Lesser General Public License for more details.
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//
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//You should have received a copy of the GNU Lesser General Public
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//License along with this library; if not, write to the Free Software
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//Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//=============================================================================
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using System;
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using System.Collections;
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using System.Text;
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using System.Drawing;
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using System.Runtime.Serialization;
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using System.Security.Permissions;
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namespace DrawGraph
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{
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/// <summary>
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/// The OrdinalScale class inherits from the <see cref="Scale" /> class, and implements
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/// the features specific to <see cref="AxisType.Ordinal" />.
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/// </summary>
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/// <remarks>
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/// OrdinalScale is an ordinal axis with tic labels generated at integral values. An ordinal axis means that
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/// all data points are evenly spaced at integral values, and the actual coordinate values
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/// for points corresponding to that axis are ignored. That is, if the X axis is an
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/// ordinal type, then all X values associated with the curves are ignored.
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/// </remarks>
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///
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/// <author> John Champion </author>
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/// <version> $Revision: 1.8 $ $Date: 2007/04/16 00:03:02 $ </version>
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[Serializable]
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class OrdinalScale : Scale, ISerializable //, ICloneable
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{
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#region constructors
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/// <summary>
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/// Default constructor that defines the owner <see cref="Axis" />
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/// (containing object) for this new object.
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/// </summary>
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/// <param name="owner">The owner, or containing object, of this instance</param>
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public OrdinalScale( Axis owner )
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: base( owner )
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{
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}
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/// <summary>
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/// The Copy Constructor
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/// </summary>
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/// <param name="rhs">The <see cref="OrdinalScale" /> object from which to copy</param>
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/// <param name="owner">The <see cref="Axis" /> object that will own the
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/// new instance of <see cref="OrdinalScale" /></param>
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public OrdinalScale( Scale rhs, Axis owner )
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: base( rhs, owner )
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{
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}
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/// <summary>
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/// Create a new clone of the current item, with a new owner assignment
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/// </summary>
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/// <param name="owner">The new <see cref="Axis" /> instance that will be
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/// the owner of the new Scale</param>
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/// <returns>A new <see cref="Scale" /> clone.</returns>
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public override Scale Clone( Axis owner )
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{
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return new OrdinalScale( this, owner );
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}
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#endregion
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#region properties
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/// <summary>
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/// Return the <see cref="AxisType" /> for this <see cref="Scale" />, which is
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/// <see cref="AxisType.Ordinal" />.
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/// </summary>
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public override AxisType Type
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{
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get { return AxisType.Ordinal; }
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}
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#endregion
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#region methods
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/// <summary>
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/// Select a reasonable ordinal axis scale given a range of data values.
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/// </summary>
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/// <remarks>
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/// This method only applies to <see cref="AxisType.Ordinal"/> type axes, and it
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/// is called by the general <see cref="Scale.PickScale"/> method. The scale range is chosen
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/// based on increments of 1, 2, or 5 (because they are even divisors of 10).
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/// Being an ordinal axis type, the <see cref="Scale.MajorStep" /> value will always be integral. This
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/// method honors the <see cref="Scale.MinAuto" />, <see cref="Scale.MaxAuto" />,
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/// and <see cref="Scale.MajorStepAuto" /> autorange settings.
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/// In the event that any of the autorange settings are false, the
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/// corresponding <see cref="Scale.Min" />, <see cref="Scale.Max" />, or <see cref="Scale.MajorStep" />
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/// setting is explicitly honored, and the remaining autorange settings (if any) will
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/// be calculated to accomodate the non-autoranged values. The basic defaults for
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/// scale selection are defined using <see cref="Scale.Default.ZeroLever" />,
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/// <see cref="Scale.Default.TargetXSteps" />, and <see cref="Scale.Default.TargetYSteps" />
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/// from the <see cref="Scale.Default" /> default class.
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/// <para>On Exit:</para>
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/// <para><see cref="Scale.Min"/> is set to scale minimum (if <see cref="Scale.MinAuto"/> = true)</para>
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/// <para><see cref="Scale.Max"/> is set to scale maximum (if <see cref="Scale.MaxAuto"/> = true)</para>
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/// <para><see cref="Scale.MajorStep"/> is set to scale step size (if <see cref="Scale.MajorStepAuto"/> = true)</para>
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/// <para><see cref="Scale.MinorStep"/> is set to scale minor step size (if <see cref="Scale.MinorStepAuto"/> = true)</para>
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/// <para><see cref="Scale.Mag"/> is set to a magnitude multiplier according to the data</para>
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/// <para><see cref="Scale.Format"/> is set to the display format for the values (this controls the
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/// number of decimal places, whether there are thousands separators, currency types, etc.)</para>
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/// </remarks>
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/// <param name="pane">A reference to the <see cref="GraphPane"/> object
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/// associated with this <see cref="Axis"/></param>
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/// <param name="g">
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/// A graphic device object to be drawn into. This is normally e.Graphics from the
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/// PaintEventArgs argument to the Paint() method.
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/// </param>
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/// <param name="scaleFactor">
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/// The scaling factor to be used for rendering objects. This is calculated and
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/// passed down by the parent <see cref="GraphPane"/> object using the
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/// <see cref="PaneBase.CalcScaleFactor"/> method, and is used to proportionally adjust
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/// font sizes, etc. according to the actual size of the graph.
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/// </param>
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/// <seealso cref="AxisType.Ordinal"/>
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override public void PickScale( GraphPane pane, Graphics g, float scaleFactor )
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{
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// call the base class first
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base.PickScale( pane, g, scaleFactor );
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PickScale( pane, g, scaleFactor, this );
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}
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internal static void PickScale( GraphPane pane, Graphics g, float scaleFactor, Scale scale )
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{
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// Test for trivial condition of range = 0 and pick a suitable default
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if ( scale._max - scale._min < 1.0 )
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{
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if ( scale._maxAuto )
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scale._max = scale._min + 0.5;
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else
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scale._min = scale._max - 0.5;
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}
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else
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{
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// Calculate the new step size
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if ( scale._majorStepAuto )
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{
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// Calculate the step size based on targetSteps
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scale._majorStep = Scale.CalcStepSize( scale._max - scale._min,
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( scale._ownerAxis is XAxis || scale._ownerAxis is X2Axis ) ?
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Default.TargetXSteps : Default.TargetYSteps );
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if ( scale.IsPreventLabelOverlap )
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{
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// Calculate the maximum number of labels
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double maxLabels = (double) scale.CalcMaxLabels( g, pane, scaleFactor );
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// Calculate a step size based on the width of the labels
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double tmpStep = Math.Ceiling( ( scale._max - scale._min ) / maxLabels );
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// Use the greater of the two step sizes
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if ( tmpStep > scale._majorStep )
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scale._majorStep = tmpStep;
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}
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}
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scale._majorStep = (int)scale._majorStep;
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if ( scale._majorStep < 1.0 )
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scale._majorStep = 1.0;
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// Calculate the new minor step size
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if ( scale._minorStepAuto )
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scale._minorStep = Scale.CalcStepSize( scale._majorStep,
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( scale._ownerAxis is XAxis || scale._ownerAxis is X2Axis ) ?
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Default.TargetMinorXSteps : Default.TargetMinorYSteps );
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if ( scale._minAuto )
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scale._min -= 0.5;
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if ( scale._maxAuto )
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scale._max += 0.5;
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}
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}
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#endregion
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#region Serialization
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/// <summary>
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/// Current schema value that defines the version of the serialized file
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/// </summary>
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public const int schema2 = 10;
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/// <summary>
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/// Constructor for deserializing objects
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/// </summary>
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/// <param name="info">A <see cref="SerializationInfo"/> instance that defines the serialized data
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/// </param>
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/// <param name="context">A <see cref="StreamingContext"/> instance that contains the serialized data
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/// </param>
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protected OrdinalScale( SerializationInfo info, StreamingContext context ) : base( info, context )
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{
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// The schema value is just a file version parameter. You can use it to make future versions
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// backwards compatible as new member variables are added to classes
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int sch = info.GetInt32( "schema2" );
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}
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/// <summary>
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/// Populates a <see cref="SerializationInfo"/> instance with the data needed to serialize the target object
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/// </summary>
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/// <param name="info">A <see cref="SerializationInfo"/> instance that defines the serialized data</param>
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/// <param name="context">A <see cref="StreamingContext"/> instance that contains the serialized data</param>
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[SecurityPermissionAttribute(SecurityAction.Demand,SerializationFormatter=true)]
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public override void GetObjectData( SerializationInfo info, StreamingContext context )
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{
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base.GetObjectData( info, context );
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info.AddValue( "schema2", schema2 );
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}
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#endregion
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}
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}
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