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272 lines
9.9 KiB
272 lines
9.9 KiB
// ==========================================================
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// FreeImage 3 .NET wrapper
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// Original FreeImage 3 functions and .NET compatible derived functions
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//
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// Design and implementation by
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// - Jean-Philippe Goerke (jpgoerke@users.sourceforge.net)
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// - Carsten Klein (cklein05@users.sourceforge.net)
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//
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// Contributors:
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// - David Boland (davidboland@vodafone.ie)
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//
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// Main reference : MSDN Knowlede Base
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//
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// This file is part of FreeImage 3
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//
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// COVERED CODE IS PROVIDED UNDER THIS LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTY
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// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, WARRANTIES
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// THAT THE COVERED CODE IS FREE OF DEFECTS, MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE
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// OR NON-INFRINGING. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE COVERED
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// CODE IS WITH YOU. SHOULD ANY COVERED CODE PROVE DEFECTIVE IN ANY RESPECT, YOU (NOT
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// THE INITIAL DEVELOPER OR ANY OTHER CONTRIBUTOR) ASSUME THE COST OF ANY NECESSARY
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// SERVICING, REPAIR OR CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL
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// PART OF THIS LICENSE. NO USE OF ANY COVERED CODE IS AUTHORIZED HEREUNDER EXCEPT UNDER
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// THIS DISCLAIMER.
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//
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// Use at your own risk!
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// ==========================================================
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// ==========================================================
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// CVS
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// $Revision: 1.3 $
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// $Date: 2009/02/20 07:41:08 $
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// $Id: FIRGBF.cs,v 1.3 2009/02/20 07:41:08 cklein05 Exp $
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// ==========================================================
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using System;
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using System.Drawing;
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using System.Runtime.InteropServices;
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namespace FreeImageAPI
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{
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/// <summary>
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/// The <b>FIRGBF</b> structure describes a color consisting of relative
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/// intensities of red, green, blue and alpha value. Each single color
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/// component consumes 32 bits and takes values in the range from 0 to 1.
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/// </summary>
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/// <remarks>
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/// <para>
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/// The <b>FIRGBF</b> structure provides access to an underlying FreeImage <b>FIRGBF</b>
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/// structure. To determine the red, green or blue component of a color, use the
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/// red, green or blue fields, respectively.
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/// </para>
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/// <para>For easy integration of the underlying structure into the .NET framework,
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/// the <b>FIRGBF</b> structure implements implicit conversion operators to
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/// convert the represented color to and from the <see cref="System.Drawing.Color"/>
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/// type. This makes the <see cref="System.Drawing.Color"/> type a real replacement
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/// for the <b>FIRGBF</b> structure and my be used in all situations which require
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/// an <b>FIRGBF</b> type.
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/// </para>
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/// <para>
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/// Each color component alpha, red, green or blue of <b>FIRGBF</b> is translated
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/// into it's corresponding color component A, R, G or B of
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/// <see cref="System.Drawing.Color"/> by linearly mapping the values of one range
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/// into the other range and vice versa.
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/// When converting from <see cref="System.Drawing.Color"/> into <b>FIRGBF</b>, the
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/// color's alpha value is ignored and assumed to be 255 when converting from
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/// <b>FIRGBF</b> into <see cref="System.Drawing.Color"/>, creating a fully
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/// opaque color.
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/// </para>
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/// <para>
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/// <b>Conversion from System.Drawing.Color to FIRGBF</b>
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/// </para>
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/// <c>FIRGBF.component = (float)Color.component / 255f</c>
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/// <para>
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/// <b>Conversion from FIRGBF to System.Drawing.Color</b>
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/// </para>
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/// <c>Color.component = (int)(FIRGBF.component * 255f)</c>
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/// <para>
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/// The same conversion is also applied when the <see cref="FreeImageAPI.FIRGBF.Color"/>
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/// property or the <see cref="FreeImageAPI.FIRGBF(System.Drawing.Color)"/> constructor
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/// is invoked.
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/// </para>
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/// </remarks>
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/// <example>
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/// The following code example demonstrates the various conversions between the
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/// <b>FIRGBF</b> structure and the <see cref="System.Drawing.Color"/> structure.
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/// <code>
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/// FIRGBF firgbf;
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/// // Initialize the structure using a native .NET Color structure.
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/// firgbf = new FIRGBF(Color.Indigo);
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/// // Initialize the structure using the implicit operator.
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/// firgbf = Color.DarkSeaGreen;
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/// // Convert the FIRGBF instance into a native .NET Color
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/// // using its implicit operator.
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/// Color color = firgbf;
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/// // Using the structure's Color property for converting it
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/// // into a native .NET Color.
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/// Color another = firgbf.Color;
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/// </code>
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/// </example>
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[Serializable, StructLayout(LayoutKind.Sequential)]
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public struct FIRGBF : IComparable, IComparable<FIRGBF>, IEquatable<FIRGBF>
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{
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/// <summary>
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/// The red color component.
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/// </summary>
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public float red;
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/// <summary>
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/// The green color component.
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/// </summary>
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public float green;
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/// <summary>
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/// The blue color component.
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/// </summary>
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public float blue;
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/// <summary>
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/// Initializes a new instance based on the specified <see cref="System.Drawing.Color"/>.
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/// </summary>
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/// <param name="color"><see cref="System.Drawing.Color"/> to initialize with.</param>
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public FIRGBF(Color color)
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{
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red = (float)color.R / 255f;
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green = (float)color.G / 255f;
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blue = (float)color.B / 255f;
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}
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/// <summary>
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/// Tests whether two specified <see cref="FIRGBF"/> structures are equivalent.
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/// </summary>
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/// <param name="left">The <see cref="FIRGBF"/> that is to the left of the equality operator.</param>
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/// <param name="right">The <see cref="FIRGBF"/> that is to the right of the equality operator.</param>
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/// <returns>
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/// <b>true</b> if the two <see cref="FIRGBF"/> structures are equal; otherwise, <b>false</b>.
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/// </returns>
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public static bool operator ==(FIRGBF left, FIRGBF right)
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{
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return
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((left.blue == right.blue) &&
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(left.green == right.green) &&
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(left.red == right.red));
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}
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/// <summary>
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/// Tests whether two specified <see cref="FIRGBF"/> structures are different.
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/// </summary>
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/// <param name="left">The <see cref="FIRGBF"/> that is to the left of the inequality operator.</param>
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/// <param name="right">The <see cref="FIRGBF"/> that is to the right of the inequality operator.</param>
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/// <returns>
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/// <b>true</b> if the two <see cref="FIRGBF"/> structures are different; otherwise, <b>false</b>.
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/// </returns>
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public static bool operator !=(FIRGBF left, FIRGBF right)
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{
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return !(left == right);
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}
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/// <summary>
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/// Converts the value of a <see cref="System.Drawing.Color"/> structure to a <see cref="FIRGBF"/> structure.
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/// </summary>
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/// <param name="value">A <see cref="System.Drawing.Color"/> structure.</param>
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/// <returns>A new instance of <see cref="FIRGBF"/> initialized to <paramref name="value"/>.</returns>
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public static implicit operator FIRGBF(Color value)
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{
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return new FIRGBF(value);
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}
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/// <summary>
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/// Converts the value of a <see cref="FIRGBF"/> structure to a <see cref="System.Drawing.Color"/> structure.
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/// </summary>
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/// <param name="value">A <see cref="FIRGBF"/> structure.</param>
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/// <returns>A new instance of <see cref="System.Drawing.Color"/> initialized to <paramref name="value"/>.</returns>
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public static implicit operator Color(FIRGBF value)
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{
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return value.Color;
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}
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/// <summary>
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/// Gets or sets the <see cref="System.Drawing.Color"/> of the structure.
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/// </summary>
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public Color Color
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{
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get
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{
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return Color.FromArgb(
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(int)(red * 255f),
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(int)(green * 255f),
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(int)(blue * 255f));
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}
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set
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{
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red = (float)value.R / 255f;
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green = (float)value.G / 255f;
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blue = (float)value.B / 255f;
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}
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}
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/// <summary>
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/// Compares this instance with a specified <see cref="Object"/>.
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/// </summary>
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/// <param name="obj">An object to compare with this instance.</param>
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/// <returns>A 32-bit signed integer indicating the lexical relationship between the two comparands.</returns>
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/// <exception cref="ArgumentException"><paramref name="obj"/> is not a <see cref="FIRGBF"/>.</exception>
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public int CompareTo(object obj)
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{
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if (obj == null)
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{
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return 1;
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}
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if (!(obj is FIRGBF))
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{
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throw new ArgumentException("obj");
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}
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return CompareTo((FIRGBF)obj);
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}
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/// <summary>
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/// Compares this instance with a specified <see cref="FIRGBF"/> object.
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/// </summary>
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/// <param name="other">A <see cref="FIRGBF"/> to compare.</param>
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/// <returns>A signed number indicating the relative values of this instance
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/// and <paramref name="other"/>.</returns>
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public int CompareTo(FIRGBF other)
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{
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return this.Color.ToArgb().CompareTo(other.Color.ToArgb());
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}
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/// <summary>
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/// Tests whether the specified object is a <see cref="FIRGBF"/> structure
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/// and is equivalent to this <see cref="FIRGBF"/> structure.
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/// </summary>
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/// <param name="obj">The object to test.</param>
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/// <returns><b>true</b> if <paramref name="obj"/> is a <see cref="FIRGBF"/> structure
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/// equivalent to this <see cref="FIRGBF"/> structure; otherwise, <b>false</b>.</returns>
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public override bool Equals(object obj)
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{
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return ((obj is FIRGBF) && (this == ((FIRGBF)obj)));
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}
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/// <summary>
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/// Tests whether the specified <see cref="FIRGBF"/> structure is equivalent to this <see cref="FIRGBF"/> structure.
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/// </summary>
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/// <param name="other">A <see cref="FIRGBF"/> structure to compare to this instance.</param>
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/// <returns><b>true</b> if <paramref name="obj"/> is a <see cref="FIRGBF"/> structure
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/// equivalent to this <see cref="FIRGBF"/> structure; otherwise, <b>false</b>.</returns>
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public bool Equals(FIRGBF other)
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{
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return (this == other);
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}
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/// <summary>
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/// Returns a hash code for this <see cref="FIRGBF"/> structure.
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/// </summary>
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/// <returns>An integer value that specifies the hash code for this <see cref="FIRGBF"/>.</returns>
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public override int GetHashCode()
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{
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return base.GetHashCode();
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}
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/// <summary>
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/// Converts the numeric value of the <see cref="FIRGBF"/> object
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/// to its equivalent string representation.
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/// </summary>
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/// <returns>The string representation of the value of this instance.</returns>
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public override string ToString()
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{
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return FreeImage.ColorToString(Color);
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}
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}
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} |