95 lines
3.7 KiB
C#
95 lines
3.7 KiB
C#
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#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.Collections.Generic;
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namespace PdfSharp.Pdf.Advanced
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{
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/// <summary>
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/// Contains all used ExtGState objects of a document.
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/// </summary>
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public sealed class PdfExtGStateTable : PdfResourceTable
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{
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/// <summary>
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/// Initializes a new instance of this class, which is a singleton for each document.
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/// </summary>
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public PdfExtGStateTable(PdfDocument document)
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: base(document)
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{ }
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/// <summary>
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/// Gets a PdfExtGState with the key 'CA' set to the specified alpha value.
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/// </summary>
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public PdfExtGState GetExtGStateStroke(double alpha, bool overprint)
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{
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string key = PdfExtGState.MakeKey(alpha, overprint);
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PdfExtGState extGState;
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if (!_strokeAlphaValues.TryGetValue(key, out extGState))
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{
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extGState = new PdfExtGState(Owner);
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//extGState.Elements[PdfExtGState.Keys.CA] = new PdfReal(alpha);
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extGState.StrokeAlpha = alpha;
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if (overprint)
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{
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extGState.StrokeOverprint = true;
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extGState.Elements.SetInteger(PdfExtGState.Keys.OPM, 1);
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}
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_strokeAlphaValues[key] = extGState;
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}
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return extGState;
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}
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/// <summary>
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/// Gets a PdfExtGState with the key 'ca' set to the specified alpha value.
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/// </summary>
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public PdfExtGState GetExtGStateNonStroke(double alpha, bool overprint)
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{
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string key = PdfExtGState.MakeKey(alpha, overprint);
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PdfExtGState extGState;
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if (!_nonStrokeStates.TryGetValue(key, out extGState))
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{
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extGState = new PdfExtGState(Owner);
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//extGState.Elements[PdfExtGState.Keys.ca] = new PdfReal(alpha);
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extGState.NonStrokeAlpha = alpha;
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if (overprint)
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{
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extGState.NonStrokeOverprint = true;
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extGState.Elements.SetInteger(PdfExtGState.Keys.OPM, 1);
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}
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_nonStrokeStates[key] = extGState;
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}
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return extGState;
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}
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readonly Dictionary<string, PdfExtGState> _strokeAlphaValues = new Dictionary<string, PdfExtGState>();
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readonly Dictionary<string, PdfExtGState> _nonStrokeStates = new Dictionary<string, PdfExtGState>();
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}
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}
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