337 lines
12 KiB
C#
337 lines
12 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.Drawing;
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using System.Drawing.Drawing2D;
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using System.Collections;
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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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/// A class that represents a bordered and/or filled polygon object on
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/// the graph. A list of <see cref="PolyObj"/> objects is maintained by
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/// the <see cref="GraphObjList"/> collection class.
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/// </summary>
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///
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/// <author> John Champion </author>
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/// <version> $Revision: 3.4 $ $Date: 2007/01/25 07:56:09 $ </version>
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[Serializable]
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public class PolyObj : BoxObj, ICloneable, ISerializable
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{
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#region Fields
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private PointD[] _points;
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/// <summary>
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/// private value that determines if the polygon will be automatically closed.
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/// true to close the figure, false to leave it "open." Use the public property
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/// <see cref="IsClosedFigure" /> to access this value.
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/// </summary>
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private bool _isClosedFigure = true;
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#endregion
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#region Properties
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/// <summary>
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/// Gets or sets the <see cref="PointD"/> array that defines
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/// the polygon. This will be in units determined by
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/// <see cref="ZedGraph.Location.CoordinateFrame"/>.
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/// </summary>
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public PointD[] Points
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{
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get { return _points; }
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set { _points = value; }
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}
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/// <summary>
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/// Gets or sets a value that determines if the polygon will be automatically closed.
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/// true to close the figure, false to leave it "open."
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/// </summary>
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/// <remarks>
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/// This boolean determines whether or not the CloseFigure() method will be called
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/// to fully close the path of the polygon. This value defaults to true, and for any
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/// closed figure it should fine. If you want to draw a line that does not close into
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/// a shape, then you should set this value to false. For a figure that is naturally
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/// closed (e.g., the first point of the polygon is the same as the last point),
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/// leaving this value set to false may result in minor pixel artifacts due to
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/// rounding.
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/// </remarks>
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public bool IsClosedFigure
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{
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get { return _isClosedFigure; }
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set { _isClosedFigure = value; }
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}
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#endregion
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#region Constructors
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/// <overloads>Constructors for the <see cref="PolyObj"/> object</overloads>
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/// <summary>
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/// A constructor that allows the position, border color, and solid fill color
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/// of the <see cref="PolyObj"/> to be pre-specified.
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/// </summary>
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/// <param name="borderColor">An arbitrary <see cref="System.Drawing.Color"/> specification
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/// for the box border</param>
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/// <param name="fillColor">An arbitrary <see cref="System.Drawing.Color"/> specification
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/// for the box fill (will be a solid color fill)</param>
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/// <param name="points">The <see cref="PointD"/> array that defines
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/// the polygon. This will be in units determined by
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/// <see cref="ZedGraph.Location.CoordinateFrame"/>.
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/// </param>
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public PolyObj( PointD[] points, Color borderColor, Color fillColor ) :
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base( 0, 0, 1, 1, borderColor, fillColor )
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{
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_points = points;
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}
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/// <summary>
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/// A constructor that allows the position
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/// of the <see cref="PolyObj"/> to be pre-specified. Other properties are defaulted.
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/// </summary>
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/// <param name="points">The <see cref="PointD"/> array that defines
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/// the polygon. This will be in units determined by
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/// <see cref="ZedGraph.Location.CoordinateFrame"/>.
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/// </param>
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public PolyObj( PointD[] points ) : base( 0, 0, 1, 1 )
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{
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_points = points;
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}
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/// <summary>
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/// A default constructor that creates a <see cref="PolyObj"/> from an empty
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/// <see cref="PointD"/> array. Other properties are defaulted.
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/// </summary>
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public PolyObj() : this( new PointD[0] )
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{
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}
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/// <summary>
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/// A constructor that allows the position, border color, and two-color
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/// gradient fill colors
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/// of the <see cref="PolyObj"/> to be pre-specified.
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/// </summary>
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/// <param name="borderColor">An arbitrary <see cref="System.Drawing.Color"/> specification
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/// for the box border</param>
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/// <param name="fillColor1">An arbitrary <see cref="System.Drawing.Color"/> specification
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/// for the start of the box gradient fill</param>
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/// <param name="fillColor2">An arbitrary <see cref="System.Drawing.Color"/> specification
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/// for the end of the box gradient fill</param>
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/// <param name="points">The <see cref="PointD"/> array that defines
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/// the polygon. This will be in units determined by
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/// <see cref="ZedGraph.Location.CoordinateFrame"/>.
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/// </param>
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public PolyObj( PointD[] points, Color borderColor,
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Color fillColor1, Color fillColor2 ) :
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base( 0, 0, 1, 1, borderColor, fillColor1, fillColor2 )
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{
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_points = points;
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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="PolyObj"/> object from which to copy</param>
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public PolyObj( PolyObj rhs ) : base( rhs )
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{
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rhs._points = (PointD[]) _points.Clone();
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rhs._isClosedFigure = _isClosedFigure;
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}
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/// <summary>
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/// Implement the <see cref="ICloneable" /> interface in a typesafe manner by just
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/// calling the typed version of <see cref="Clone" />
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/// </summary>
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/// <returns>A deep copy of this object</returns>
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object ICloneable.Clone()
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{
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return this.Clone();
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}
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/// <summary>
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/// Typesafe, deep-copy clone method.
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/// </summary>
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/// <returns>A new, independent copy of this class</returns>
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public new PolyObj Clone()
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{
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return new PolyObj( this );
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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 schema3 = 11;
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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 PolyObj( 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( "schema3" );
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_points = (PointD[]) info.GetValue( "points", typeof(PointD[]) );
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if ( schema3 >= 11 )
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_isClosedFigure = info.GetBoolean( "isClosedFigure" );
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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( "schema3", schema3 );
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info.AddValue( "points", _points );
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info.AddValue( "isClosedFigure", _isClosedFigure );
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}
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#endregion
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#region Rendering Methods
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/// <summary>
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/// Render this object to the specified <see cref="Graphics"/> device.
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/// </summary>
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/// <remarks>
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/// This method is normally only called by the Draw method
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/// of the parent <see cref="GraphObjList"/> collection object.
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/// </remarks>
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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="pane">
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/// A reference to the <see cref="PaneBase"/> object that is the parent or
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/// owner of this object.
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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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override public void Draw( Graphics g, PaneBase pane, float scaleFactor )
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{
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if ( _points != null && _points.Length > 1 )
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{
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using ( GraphicsPath path = MakePath( pane ) )
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{
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// Fill or draw the symbol as required
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if ( _fill.IsVisible )
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{
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using ( Brush brush = this.Fill.MakeBrush( path.GetBounds() ) )
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g.FillPath( brush, path );
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}
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if ( _border.IsVisible )
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{
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using ( Pen pen = _border.GetPen( pane, scaleFactor ) )
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g.DrawPath( pen, path );
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}
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}
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}
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}
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internal GraphicsPath MakePath( PaneBase pane )
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{
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GraphicsPath path = new GraphicsPath();
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bool first = true;
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PointF lastPt = new PointF();
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foreach( PointD pt in _points )
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{
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// Convert the coordinates from the user coordinate system
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// to the screen coordinate system
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// Offset the points by the location value
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PointF pixPt = Location.Transform( pane, pt.X + _location.X, pt.Y + _location.Y,
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_location.CoordinateFrame );
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if ( Math.Abs( pixPt.X ) < 100000 &&
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Math.Abs( pixPt.Y ) < 100000 )
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{
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if ( first )
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first = false;
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else
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path.AddLine( lastPt, pixPt );
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lastPt = pixPt;
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}
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}
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if ( _isClosedFigure )
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path.CloseFigure();
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return path;
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}
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/// <summary>
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/// Determine if the specified screen point lies inside the bounding box of this
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/// <see cref="PolyObj"/>.
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/// </summary>
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/// <param name="pt">The screen point, in pixels</param>
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/// <param name="pane">
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/// A reference to the <see cref="PaneBase"/> object that is the parent or
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/// owner of this object.
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/// </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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/// <returns>true if the point lies in the bounding box, false otherwise</returns>
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override public bool PointInBox( PointF pt, PaneBase pane, Graphics g, float scaleFactor )
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{
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if ( _points != null && _points.Length > 1 )
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{
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if ( ! base.PointInBox(pt, pane, g, scaleFactor ) )
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return false;
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using ( GraphicsPath path = MakePath( pane ) )
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return path.IsVisible( pt );
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}
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else
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return false;
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}
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#endregion
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}
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}
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