597 lines
18 KiB
C#
597 lines
18 KiB
C#
#region PDFsharp - A .NET library for processing PDF
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//
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// Authors:
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// Stefan Lange
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//
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// Copyright (c) 2005-2017 empira Software GmbH, Cologne Area (Germany)
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//
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// http://www.pdfsharp.com
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// http://sourceforge.net/projects/pdfsharp
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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#endregion
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using System;
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using System.Diagnostics;
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using System.Globalization;
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namespace PdfSharp.Drawing
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{
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/// <summary>
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/// Represents a value and its unit of measure. The structure converts implicitly from and to
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/// double with a value measured in point.
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/// </summary>
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[DebuggerDisplay("{DebuggerDisplay}")]
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public struct XUnit : IFormattable
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{
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internal const double PointFactor = 1;
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internal const double InchFactor = 72;
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internal const double MillimeterFactor = 72 / 25.4;
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internal const double CentimeterFactor = 72 / 2.54;
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internal const double PresentationFactor = 72 / 96.0;
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internal const double PointFactorWpf = 96 / 72.0;
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internal const double InchFactorWpf = 96;
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internal const double MillimeterFactorWpf = 96 / 25.4;
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internal const double CentimeterFactorWpf = 96 / 2.54;
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internal const double PresentationFactorWpf = 1;
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/// <summary>
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/// Initializes a new instance of the XUnit class with type set to point.
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/// </summary>
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public XUnit(double point)
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{
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_value = point;
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_type = XGraphicsUnit.Point;
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}
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/// <summary>
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/// Initializes a new instance of the XUnit class.
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/// </summary>
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public XUnit(double value, XGraphicsUnit type)
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{
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if (!Enum.IsDefined(typeof(XGraphicsUnit), type))
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#if !SILVERLIGHT && !NETFX_CORE && !UWP
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throw new System.ComponentModel.InvalidEnumArgumentException(nameof(type), (int)type, typeof(XGraphicsUnit));
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#else
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throw new ArgumentException("type");
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#endif
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_value = value;
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_type = type;
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}
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/// <summary>
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/// Gets the raw value of the object without any conversion.
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/// To determine the XGraphicsUnit use property <code>Type</code>.
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/// To get the value in point use the implicit conversion to double.
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/// </summary>
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public double Value
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{
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get { return _value; }
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}
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/// <summary>
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/// Gets the unit of measure.
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/// </summary>
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public XGraphicsUnit Type
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{
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get { return _type; }
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}
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/// <summary>
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/// Gets or sets the value in point.
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/// </summary>
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public double Point
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{
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get
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{
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switch (_type)
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{
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case XGraphicsUnit.Point:
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return _value;
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case XGraphicsUnit.Inch:
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return _value * 72;
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case XGraphicsUnit.Millimeter:
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return _value * 72 / 25.4;
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case XGraphicsUnit.Centimeter:
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return _value * 72 / 2.54;
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case XGraphicsUnit.Presentation:
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return _value * 72 / 96;
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default:
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throw new InvalidCastException();
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}
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}
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set
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{
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_value = value;
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_type = XGraphicsUnit.Point;
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}
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}
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/// <summary>
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/// Gets or sets the value in inch.
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/// </summary>
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public double Inch
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{
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get
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{
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switch (_type)
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{
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case XGraphicsUnit.Point:
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return _value / 72;
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case XGraphicsUnit.Inch:
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return _value;
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case XGraphicsUnit.Millimeter:
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return _value / 25.4;
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case XGraphicsUnit.Centimeter:
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return _value / 2.54;
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case XGraphicsUnit.Presentation:
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return _value / 96;
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default:
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throw new InvalidCastException();
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}
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}
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set
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{
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_value = value;
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_type = XGraphicsUnit.Inch;
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}
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}
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/// <summary>
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/// Gets or sets the value in millimeter.
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/// </summary>
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public double Millimeter
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{
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get
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{
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switch (_type)
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{
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case XGraphicsUnit.Point:
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return _value * 25.4 / 72;
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case XGraphicsUnit.Inch:
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return _value * 25.4;
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case XGraphicsUnit.Millimeter:
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return _value;
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case XGraphicsUnit.Centimeter:
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return _value * 10;
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case XGraphicsUnit.Presentation:
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return _value * 25.4 / 96;
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default:
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throw new InvalidCastException();
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}
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}
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set
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{
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_value = value;
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_type = XGraphicsUnit.Millimeter;
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}
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}
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/// <summary>
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/// Gets or sets the value in centimeter.
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/// </summary>
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public double Centimeter
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{
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get
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{
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switch (_type)
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{
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case XGraphicsUnit.Point:
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return _value * 2.54 / 72;
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case XGraphicsUnit.Inch:
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return _value * 2.54;
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case XGraphicsUnit.Millimeter:
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return _value / 10;
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case XGraphicsUnit.Centimeter:
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return _value;
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case XGraphicsUnit.Presentation:
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return _value * 2.54 / 96;
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default:
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throw new InvalidCastException();
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}
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}
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set
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{
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_value = value;
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_type = XGraphicsUnit.Centimeter;
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}
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}
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/// <summary>
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/// Gets or sets the value in presentation units (1/96 inch).
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/// </summary>
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public double Presentation
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{
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get
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{
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switch (_type)
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{
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case XGraphicsUnit.Point:
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return _value * 96 / 72;
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case XGraphicsUnit.Inch:
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return _value * 96;
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case XGraphicsUnit.Millimeter:
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return _value * 96 / 25.4;
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case XGraphicsUnit.Centimeter:
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return _value * 96 / 2.54;
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case XGraphicsUnit.Presentation:
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return _value;
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default:
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throw new InvalidCastException();
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}
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}
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set
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{
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_value = value;
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_type = XGraphicsUnit.Point;
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}
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}
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/// <summary>
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/// Returns the object as string using the format information.
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/// The unit of measure is appended to the end of the string.
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/// </summary>
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public string ToString(IFormatProvider formatProvider)
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{
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string valuestring = _value.ToString(formatProvider) + GetSuffix();
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return valuestring;
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}
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/// <summary>
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/// Returns the object as string using the specified format and format information.
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/// The unit of measure is appended to the end of the string.
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/// </summary>
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string IFormattable.ToString(string format, IFormatProvider formatProvider)
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{
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string valuestring = _value.ToString(format, formatProvider) + GetSuffix();
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return valuestring;
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}
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/// <summary>
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/// Returns the object as string. The unit of measure is appended to the end of the string.
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/// </summary>
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public override string ToString()
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{
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string valuestring = _value.ToString(CultureInfo.InvariantCulture) + GetSuffix();
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return valuestring;
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}
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/// <summary>
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/// Returns the unit of measure of the object as a string like 'pt', 'cm', or 'in'.
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/// </summary>
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string GetSuffix()
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{
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switch (_type)
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{
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case XGraphicsUnit.Point:
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return "pt";
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case XGraphicsUnit.Inch:
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return "in";
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case XGraphicsUnit.Millimeter:
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return "mm";
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case XGraphicsUnit.Centimeter:
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return "cm";
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case XGraphicsUnit.Presentation:
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return "pu";
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//case XGraphicsUnit.Pica:
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// return "pc";
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//case XGraphicsUnit.Line:
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// return "li";
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default:
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throw new InvalidCastException();
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}
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}
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/// <summary>
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/// Returns an XUnit object. Sets type to point.
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/// </summary>
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public static XUnit FromPoint(double value)
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{
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XUnit unit;
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unit._value = value;
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unit._type = XGraphicsUnit.Point;
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return unit;
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}
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/// <summary>
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/// Returns an XUnit object. Sets type to inch.
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/// </summary>
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public static XUnit FromInch(double value)
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{
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XUnit unit;
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unit._value = value;
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unit._type = XGraphicsUnit.Inch;
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return unit;
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}
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/// <summary>
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/// Returns an XUnit object. Sets type to millimeters.
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/// </summary>
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public static XUnit FromMillimeter(double value)
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{
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XUnit unit;
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unit._value = value;
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unit._type = XGraphicsUnit.Millimeter;
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return unit;
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}
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/// <summary>
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/// Returns an XUnit object. Sets type to centimeters.
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/// </summary>
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public static XUnit FromCentimeter(double value)
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{
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XUnit unit;
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unit._value = value;
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unit._type = XGraphicsUnit.Centimeter;
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return unit;
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}
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/// <summary>
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/// Returns an XUnit object. Sets type to Presentation.
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/// </summary>
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public static XUnit FromPresentation(double value)
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{
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XUnit unit;
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unit._value = value;
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unit._type = XGraphicsUnit.Presentation;
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return unit;
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}
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/// <summary>
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/// Converts a string to an XUnit object.
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/// If the string contains a suffix like 'cm' or 'in' the object will be converted
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/// to the appropriate type, otherwise point is assumed.
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/// </summary>
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public static implicit operator XUnit(string value)
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{
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XUnit unit;
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value = value.Trim();
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// HACK for Germans...
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value = value.Replace(',', '.');
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int count = value.Length;
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int valLen = 0;
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for (; valLen < count;)
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{
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char ch = value[valLen];
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if (ch == '.' || ch == '-' || ch == '+' || char.IsNumber(ch))
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valLen++;
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else
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break;
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}
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try
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{
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unit._value = Double.Parse(value.Substring(0, valLen).Trim(), CultureInfo.InvariantCulture);
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}
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catch (Exception ex)
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{
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unit._value = 1;
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string message = String.Format("String '{0}' is not a valid value for structure 'XUnit'.", value);
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throw new ArgumentException(message, ex);
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}
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string typeStr = value.Substring(valLen).Trim().ToLower();
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unit._type = XGraphicsUnit.Point;
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switch (typeStr)
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{
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case "cm":
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unit._type = XGraphicsUnit.Centimeter;
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break;
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case "in":
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unit._type = XGraphicsUnit.Inch;
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break;
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case "mm":
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unit._type = XGraphicsUnit.Millimeter;
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break;
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case "":
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case "pt":
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unit._type = XGraphicsUnit.Point;
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break;
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case "pu": // presentation units
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unit._type = XGraphicsUnit.Presentation;
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break;
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default:
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throw new ArgumentException("Unknown unit type: '" + typeStr + "'");
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}
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return unit;
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}
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/// <summary>
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/// Converts an int to an XUnit object with type set to point.
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/// </summary>
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public static implicit operator XUnit(int value)
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{
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XUnit unit;
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unit._value = value;
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unit._type = XGraphicsUnit.Point;
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return unit;
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}
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/// <summary>
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/// Converts a double to an XUnit object with type set to point.
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/// </summary>
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public static implicit operator XUnit(double value)
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{
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XUnit unit;
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unit._value = value;
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unit._type = XGraphicsUnit.Point;
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return unit;
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}
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/// <summary>
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/// Returns a double value as point.
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/// </summary>
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public static implicit operator double(XUnit value)
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{
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return value.Point;
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}
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/// <summary>
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/// Memberwise comparison. To compare by value,
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/// use code like Math.Abs(a.Pt - b.Pt) < 1e-5.
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/// </summary>
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public static bool operator ==(XUnit value1, XUnit value2)
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{
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// ReSharper disable CompareOfFloatsByEqualityOperator
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return value1._type == value2._type && value1._value == value2._value;
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// ReSharper restore CompareOfFloatsByEqualityOperator
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}
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/// <summary>
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/// Memberwise comparison. To compare by value,
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/// use code like Math.Abs(a.Pt - b.Pt) < 1e-5.
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/// </summary>
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public static bool operator !=(XUnit value1, XUnit value2)
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{
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return !(value1 == value2);
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}
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/// <summary>
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/// Calls base class Equals.
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/// </summary>
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public override bool Equals(Object obj)
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{
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if (obj is XUnit)
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return this == (XUnit)obj;
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return false;
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}
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/// <summary>
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/// Returns the hash code for this instance.
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/// </summary>
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public override int GetHashCode()
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{
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// ReSharper disable NonReadonlyFieldInGetHashCode
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return _value.GetHashCode() ^ _type.GetHashCode();
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// ReSharper restore NonReadonlyFieldInGetHashCode
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}
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/// <summary>
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/// This member is intended to be used by XmlDomainObjectReader only.
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/// </summary>
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public static XUnit Parse(string value)
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{
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XUnit unit = value;
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return unit;
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}
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/// <summary>
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/// Converts an existing object from one unit into another unit type.
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/// </summary>
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public void ConvertType(XGraphicsUnit type)
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{
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if (_type == type)
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return;
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switch (type)
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{
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case XGraphicsUnit.Point:
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_value = Point;
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_type = XGraphicsUnit.Point;
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break;
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case XGraphicsUnit.Inch:
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_value = Inch;
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_type = XGraphicsUnit.Inch;
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break;
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case XGraphicsUnit.Centimeter:
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_value = Centimeter;
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_type = XGraphicsUnit.Centimeter;
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break;
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case XGraphicsUnit.Millimeter:
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_value = Millimeter;
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_type = XGraphicsUnit.Millimeter;
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break;
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case XGraphicsUnit.Presentation:
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_value = Presentation;
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_type = XGraphicsUnit.Presentation;
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break;
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default:
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throw new ArgumentException("Unknown unit type: '" + type + "'");
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}
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}
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/// <summary>
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/// Represents a unit with all values zero.
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/// </summary>
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public static readonly XUnit Zero = new XUnit();
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double _value;
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XGraphicsUnit _type;
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/// <summary>
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/// Gets the DebuggerDisplayAttribute text.
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/// </summary>
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/// <value>The debugger display.</value>
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// ReSharper disable UnusedMember.Local
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string DebuggerDisplay
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// ReSharper restore UnusedMember.Local
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{
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get
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{
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const string format = Config.SignificantFigures10;
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return String.Format(CultureInfo.InvariantCulture, "unit=({0:" + format + "} {1})", _value, GetSuffix());
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}
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}
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}
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} |