178 lines
8.1 KiB
C#
178 lines
8.1 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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#if GDI
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using System.Drawing;
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using System.Drawing.Imaging;
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#endif
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#if WPF
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using System.Windows.Media;
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#endif
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namespace PdfSharp.Pdf.Advanced
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{
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/// <summary>
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/// Represents a tiling pattern dictionary.
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/// </summary>
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public sealed class PdfTilingPattern : PdfDictionaryWithContentStream
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{
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/// <summary>
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/// Initializes a new instance of the <see cref="PdfShadingPattern"/> class.
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/// </summary>
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public PdfTilingPattern(PdfDocument document)
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: base(document)
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{
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Elements.SetName(Keys.Type, "/Pattern");
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Elements[Keys.PatternType] = new PdfInteger(1);
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}
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///// <summary>
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///// Setups the shading pattern from the specified brush.
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///// </summary>
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//public void SetupFromBrush(XLinearGradientBrush brush, XMatrix matrix)
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//{
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// if (brush == null)
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// throw new ArgumentNullException("brush");
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// PdfShading shading = new PdfShading(document);
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// shading.SetupFromBrush(brush);
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// Elements[Keys.Shading] = shading;
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// Elements[Keys.Matrix] = new PdfLiteral("[" + PdfEncoders.ToString(matrix) + "]");
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//}
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/// <summary>
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/// Common keys for all streams.
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/// </summary>
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internal sealed new class Keys : PdfDictionaryWithContentStream.Keys
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{
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/// <summary>
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/// (Optional) The type of PDF object that this dictionary describes; if present,
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/// must be Pattern for a pattern dictionary.
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/// </summary>
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[KeyInfo(KeyType.Name | KeyType.Required)]
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public const string Type = "/Type";
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/// <summary>
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/// (Required) A code identifying the type of pattern that this dictionary describes;
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/// must be 1 for a tiling pattern.
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/// </summary>
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[KeyInfo(KeyType.Integer | KeyType.Required)]
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public const string PatternType = "/PatternType";
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/// <summary>
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/// (Required) A code that determines how the color of the pattern cell is to be specified:
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/// 1: Colored tiling pattern. The pattern<72>s content stream specifies the colors used to
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/// paint the pattern cell. When the content stream begins execution, the current color
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/// is the one that was initially in effect in the pattern<72>s parent content stream.
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/// 2: Uncolored tiling pattern. The pattern<72>s content stream does not specify any color
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/// information. Instead, the entire pattern cell is painted with a separately specified color
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/// each time the pattern is used. Essentially, the content stream describes a stencil
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/// through which the current color is to be poured. The content stream must not invoke
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/// operators that specify colors or other color-related parameters in the graphics state;
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/// otherwise, an error occurs. The content stream may paint an image mask, however,
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/// since it does not specify any color information.
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/// </summary>
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[KeyInfo(KeyType.Integer | KeyType.Required)]
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public const string PaintType = "/PaintType";
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/// <summary>
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/// (Required) A code that controls adjustments to the spacing of tiles relative to the device
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/// pixel grid:
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/// 1: Constant spacing. Pattern cells are spaced consistently<6C>that is, by a multiple of a
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/// device pixel. To achieve this, the application may need to distort the pattern cell slightly
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/// by making small adjustments to XStep, YStep, and the transformation matrix. The amount
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/// of distortion does not exceed 1 device pixel.
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/// 2: No distortion. The pattern cell is not distorted, but the spacing between pattern cells
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/// may vary by as much as 1 device pixel, both horizontally and vertically, when the pattern
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/// is painted. This achieves the spacing requested by XStep and YStep on average but not
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/// necessarily for each individual pattern cell.
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/// 3: Constant spacing and faster tiling. Pattern cells are spaced consistently as in tiling
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/// type 1 but with additional distortion permitted to enable a more efficient implementation.
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/// </summary>
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[KeyInfo(KeyType.Integer | KeyType.Required)]
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public const string TilingType = "/TilingType";
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/// <summary>
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/// (Required) An array of four numbers in the pattern coordinate system giving the
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/// coordinates of the left, bottom, right, and top edges, respectively, of the pattern
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/// cell<6C>s bounding box. These boundaries are used to clip the pattern cell.
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/// </summary>
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[KeyInfo(KeyType.Rectangle | KeyType.Optional)]
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public const string BBox = "/BBox";
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/// <summary>
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/// (Required) The desired horizontal spacing between pattern cells, measured in the
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/// pattern coordinate system.
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/// </summary>
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[KeyInfo(KeyType.Real | KeyType.Required)]
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public const string XStep = "/XStep";
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/// <summary>
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/// (Required) The desired vertical spacing between pattern cells, measured in the pattern
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/// coordinate system. Note that XStep and YStep may differ from the dimensions of the
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/// pattern cell implied by the BBox entry. This allows tiling with irregularly shaped figures.
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/// XStep and YStep may be either positive or negative but not zero.
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/// </summary>
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[KeyInfo(KeyType.Real | KeyType.Required)]
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public const string YStep = "/YStep";
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/// <summary>
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/// (Required) A resource dictionary containing all of the named resources required by
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/// the pattern<72>s content stream (see Section 3.7.2, <20>Resource Dictionaries<65>).
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/// </summary>
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[KeyInfo(KeyType.Dictionary | KeyType.Required)]
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public new const string Resources = "/Resources";
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/// <summary>
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/// (Optional) An array of six numbers specifying the pattern matrix.
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/// Default value: the identity matrix [1 0 0 1 0 0].
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/// </summary>
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[KeyInfo(KeyType.Array | KeyType.Optional)]
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public const string Matrix = "/Matrix";
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/// <summary>
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/// Gets the KeysMeta for these keys.
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/// </summary>
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internal static DictionaryMeta Meta
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{
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get { return _meta ?? (_meta = CreateMeta(typeof(Keys))); }
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}
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static DictionaryMeta _meta;
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}
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/// <summary>
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/// Gets the KeysMeta of this dictionary type.
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/// </summary>
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internal override DictionaryMeta Meta
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{
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get { return Keys.Meta; }
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}
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}
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}
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