324 lines
12 KiB
C#
324 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 ?2004 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 graphic arrow or line object on the graph. A list of
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/// ArrowObj objects is maintained by 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 07:56:08 $ </version>
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[Serializable]
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public class ArrowObj : LineObj, ICloneable, ISerializable
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{
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#region Fields
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/// <summary>
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/// Private field that stores the arrowhead size, measured in points.
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/// Use the public property <see cref="Size"/> to access this value.
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/// </summary>
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private float _size;
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/// <summary>
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/// Private boolean field that stores the arrowhead state.
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/// Use the public property <see cref="IsArrowHead"/> to access this value.
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/// </summary>
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/// <value> true if an arrowhead is to be drawn, false otherwise </value>
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private bool _isArrowHead;
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#endregion
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#region Defaults
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/// <summary>
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/// A simple struct that defines the
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/// default property values for the <see cref="ArrowObj"/> class.
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/// </summary>
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new public struct Default
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{
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/// <summary>
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/// The default size for the <see cref="ArrowObj"/> item arrowhead
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/// (<see cref="ArrowObj.Size"/> property). Units are in points (1/72 inch).
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/// </summary>
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public static float Size = 12.0F;
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/// <summary>
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/// The default display mode for the <see cref="ArrowObj"/> item arrowhead
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/// (<see cref="ArrowObj.IsArrowHead"/> property). true to show the
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/// arrowhead, false to hide it.
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/// </summary>
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public static bool IsArrowHead = true;
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}
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#endregion
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#region Properties
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/// <summary>
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/// The size of the arrowhead.
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/// </summary>
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/// <remarks>The display of the arrowhead can be
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/// enabled or disabled with the <see cref="IsArrowHead"/> property.
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/// </remarks>
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/// <value> The size is defined in points (1/72 inch) </value>
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/// <seealso cref="Default.Size"/>
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public float Size
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{
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get { return _size; }
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set { _size = value; }
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}
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/// <summary>
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/// Determines whether or not to draw an arrowhead
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/// </summary>
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/// <value> true to show the arrowhead, false to show the line segment
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/// only</value>
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/// <seealso cref="Default.IsArrowHead"/>
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public bool IsArrowHead
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{
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get { return _isArrowHead; }
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set { _isArrowHead = 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="ArrowObj"/> 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="ArrowObj"/> 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="size">The size of the arrowhead, measured in points.</param>
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/// <param name="x1">The x position of the starting point that defines the
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/// arrow. 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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/// arrow. 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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/// arrow. 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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/// arrow. The units of this position are specified by the
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/// <see cref="Location.CoordinateFrame"/> property.</param>
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public ArrowObj( Color color, float size, double x1, double y1,
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double x2, double y2 )
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: base( color, x1, y1, x2, y2 )
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{
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_isArrowHead = Default.IsArrowHead;
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_size = size;
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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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/// arrow 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="ArrowObj"/>. 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="ArrowObj"/>. 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="ArrowObj"/>. 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="ArrowObj"/>. The units of this position are specified by the
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/// <see cref="Location.CoordinateFrame"/> property.</param>
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public ArrowObj( double x1, double y1, double x2, double y2 )
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: this( LineBase.Default.Color, Default.Size, 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="ArrowObj"/> 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 ArrowObj()
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:
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this( LineBase.Default.Color, Default.Size, 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="ArrowObj"/> object from which to copy</param>
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public ArrowObj( ArrowObj rhs )
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: base( rhs )
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{
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_size = rhs.Size;
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_isArrowHead = rhs.IsArrowHead;
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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 ArrowObj Clone()
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{
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return new ArrowObj( 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 = 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 ArrowObj( SerializationInfo info, StreamingContext context )
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: 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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_size = info.GetSingle( "size" );
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_isArrowHead = info.GetBoolean( "isArrowHead" );
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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", schema2 );
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info.AddValue( "size", _size );
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info.AddValue( "isArrowHead", _isArrowHead );
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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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// get a scaled size for the arrowhead
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float scaledSize = (float)( _size * scaleFactor );
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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( _color, pane.ScaledPenWidth( _penWidth, scaleFactor ) ) )
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{
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//pen.DashStyle = _style;
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// Only show the arrowhead if required
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if ( _isArrowHead )
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{
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// Draw the line segment for this arrow
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g.DrawLine( pen, 0, 0, length - scaledSize + 1, 0 );
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// Create a polygon representing the arrowhead based on the scaled
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// size
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PointF[] polyPt = new PointF[4];
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float hsize = scaledSize / 3.0F;
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polyPt[0].X = length;
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polyPt[0].Y = 0;
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polyPt[1].X = length - scaledSize;
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polyPt[1].Y = hsize;
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polyPt[2].X = length - scaledSize;
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polyPt[2].Y = -hsize;
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polyPt[3] = polyPt[0];
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using ( SolidBrush brush = new SolidBrush( _line._color ) )
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// render the arrowhead
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g.FillPolygon( brush, polyPt );
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}
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else
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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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#endregion
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}
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}
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