339 lines
13 KiB
C#
339 lines
13 KiB
C#
//============================================================================
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//ZedGraph Class Library - A Flexible Line Graph/Bar Graph Library in C#
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//Copyright ?2006 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 line segment object on the graph. A list of
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/// GraphObj objects is maintained by the <see cref="GraphObjList"/> collection class.
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/// </summary>
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/// <remarks>
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/// This should not be confused with the <see cref="LineItem" /> class, which represents
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/// a set of points plotted together as a "curve". The <see cref="LineObj" /> class is
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/// a single line segment, drawn as a "decoration" on the chart.</remarks>
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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 LineObj : GraphObj, ICloneable, ISerializable
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{
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#region Fields
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/// <summary>
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/// protected field that maintains the attributes of the line using an
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/// instance of the <see cref="LineBase" /> class.
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/// </summary>
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protected LineBase _line;
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#endregion
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#region Properties
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/// <summary>
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/// A <see cref="LineBase" /> class that contains the attributes for drawing this
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/// <see cref="LineObj" />.
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/// </summary>
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public LineBase Line
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{
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get { return _line; }
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set { _line = 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="LineObj"/> object</overloads>
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/// <summary>
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/// A constructor that allows the position, color, and size of the
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/// <see cref="LineObj"/> to be pre-specified.
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/// </summary>
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/// <param name="color">An arbitrary <see cref="System.Drawing.Color"/> specification
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/// for the arrow</param>
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/// <param name="x1">The x position of the starting point that defines the
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/// line. The units of this position are specified by the
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/// <see cref="Location.CoordinateFrame"/> property.</param>
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/// <param name="y1">The y position of the starting point that defines the
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/// line. The units of this position are specified by the
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/// <see cref="Location.CoordinateFrame"/> property.</param>
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/// <param name="x2">The x position of the ending point that defines the
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/// line. The units of this position are specified by the
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/// <see cref="Location.CoordinateFrame"/> property.</param>
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/// <param name="y2">The y position of the ending point that defines the
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/// line. The units of this position are specified by the
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/// <see cref="Location.CoordinateFrame"/> property.</param>
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public LineObj( Color color, double x1, double y1, double x2, double y2 )
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: base( x1, y1, x2 - x1, y2 - y1 )
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{
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_line = new LineBase( color );
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this.Location.AlignH = AlignH.Left;
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this.Location.AlignV = AlignV.Top;
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}
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/// <summary>
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/// A constructor that allows only the position of the
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/// line to be pre-specified. All other properties are set to
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/// default values
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/// </summary>
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/// <param name="x1">The x position of the starting point that defines the
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/// <see cref="LineObj"/>. The units of this position are specified by the
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/// <see cref="Location.CoordinateFrame"/> property.</param>
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/// <param name="y1">The y position of the starting point that defines the
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/// <see cref="LineObj"/>. The units of this position are specified by the
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/// <see cref="Location.CoordinateFrame"/> property.</param>
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/// <param name="x2">The x position of the ending point that defines the
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/// <see cref="LineObj"/>. The units of this position are specified by the
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/// <see cref="Location.CoordinateFrame"/> property.</param>
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/// <param name="y2">The y position of the ending point that defines the
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/// <see cref="LineObj"/>. The units of this position are specified by the
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/// <see cref="Location.CoordinateFrame"/> property.</param>
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public LineObj( double x1, double y1, double x2, double y2 )
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: this( LineBase.Default.Color, x1, y1, x2, y2 )
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{
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}
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/// <summary>
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/// Default constructor -- places the <see cref="LineObj"/> at location
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/// (0,0) to (1,1). All other values are defaulted.
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/// </summary>
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public LineObj() : this( LineBase.Default.Color, 0, 0, 1, 1 )
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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="LineObj"/> object from which to copy</param>
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public LineObj( LineObj rhs ) : base( rhs )
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{
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_line = new LineBase( rhs._line );
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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 LineObj Clone()
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{
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return new LineObj( 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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// changed to 2 with addition of Style property
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public const int schema2 = 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 LineObj( 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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_line = (LineBase)info.GetValue( "line", typeof( LineBase ) );
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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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info.AddValue( "line", _line );
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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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// Convert the arrow coordinates from the user coordinate system
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// to the screen coordinate system
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PointF pix1 = this.Location.TransformTopLeft( pane );
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PointF pix2 = this.Location.TransformBottomRight( pane );
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if ( pix1.X > -10000 && pix1.X < 100000 && pix1.Y > -100000 && pix1.Y < 100000 &&
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pix2.X > -10000 && pix2.X < 100000 && pix2.Y > -100000 && pix2.Y < 100000 )
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{
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// calculate the length and the angle of the arrow "vector"
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double dy = pix2.Y - pix1.Y;
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double dx = pix2.X - pix1.X;
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float angle = (float)Math.Atan2( dy, dx ) * 180.0F / (float)Math.PI;
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float length = (float)Math.Sqrt( dx * dx + dy * dy );
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// Save the old transform matrix
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Matrix transform = g.Transform;
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// Move the coordinate system so it is located at the starting point
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// of this arrow
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g.TranslateTransform( pix1.X, pix1.Y );
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// Rotate the coordinate system according to the angle of this arrow
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// about the starting point
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g.RotateTransform( angle );
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// get a pen according to this arrow properties
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using ( Pen pen = _line.GetPen( pane, scaleFactor ) )
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//new Pen( _line._color, pane.ScaledPenWidth( _line._width, scaleFactor ) ) )
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{
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//pen.DashStyle = _style;
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g.DrawLine( pen, 0, 0, length, 0 );
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}
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// Restore the transform matrix back to its original state
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g.Transform = transform;
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}
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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="LineObj"/>.
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/// </summary>
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/// <remarks>The bounding box is calculated assuming a distance
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/// of <see cref="GraphPane.Default.NearestTol"/> pixels around the arrow segment.
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/// </remarks>
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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 ( ! base.PointInBox(pt, pane, g, scaleFactor ) )
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return false;
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// transform the x,y location from the user-defined
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// coordinate frame to the screen pixel location
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PointF pix = _location.TransformTopLeft( pane );
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PointF pix2 = _location.TransformBottomRight( pane );
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using ( Pen pen = new Pen( Color.Black, (float)GraphPane.Default.NearestTol * 2.0F ) )
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{
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using ( GraphicsPath path = new GraphicsPath() )
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{
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path.AddLine( pix, pix2 );
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return path.IsOutlineVisible( pt, pen );
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}
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}
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}
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/// <summary>
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/// Determines the shape type and Coords values for this GraphObj
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/// </summary>
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override public void GetCoords( PaneBase pane, Graphics g, float scaleFactor,
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out string shape, out string coords )
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{
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// transform the x,y location from the user-defined
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// coordinate frame to the screen pixel location
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RectangleF pixRect = _location.TransformRect( pane );
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Matrix matrix = new Matrix();
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if ( pixRect.Right == 0 )
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pixRect.Width = 1;
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float angle = (float) Math.Atan( ( pixRect.Top - pixRect.Bottom ) /
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( pixRect.Left - pixRect.Right ) );
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matrix.Rotate( angle, MatrixOrder.Prepend );
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// Move the coordinate system to local coordinates
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// of this text object (that is, at the specified
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// x,y location)
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matrix.Translate( -pixRect.Left, -pixRect.Top, MatrixOrder.Prepend );
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PointF[] pts = new PointF[4];
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pts[0] = new PointF( 0, 3 );
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pts[1] = new PointF( pixRect.Width, 3 );
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pts[2] = new PointF( pixRect.Width, -3 );
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pts[3] = new PointF( 0, -3 );
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matrix.TransformPoints( pts );
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shape = "poly";
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coords = String.Format( "{0:f0},{1:f0},{2:f0},{3:f0},{4:f0},{5:f0},{6:f0},{7:f0},",
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pts[0].X, pts[0].Y, pts[1].X, pts[1].Y,
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pts[2].X, pts[2].Y, pts[3].X, pts[3].Y );
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}
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#endregion
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}
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}
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