277 lines
11 KiB
C#
277 lines
11 KiB
C#
using System;
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using iTextSharp.text;
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/*
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* Copyright 2002 Paulo Soares
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* (the "License"); you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the License.
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*
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* The Original Code is 'iText, a free JAVA-PDF library'.
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*
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* The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
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* the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
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* All Rights Reserved.
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* Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
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* are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
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*
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* Contributor(s): all the names of the contributors are added in the source code
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* where applicable.
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*
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* Alternatively, the contents of this file may be used under the terms of the
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* LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
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* provisions of LGPL are applicable instead of those above. If you wish to
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* allow use of your version of this file only under the terms of the LGPL
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* License and not to allow others to use your version of this file under
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* the MPL, indicate your decision by deleting the provisions above and
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* replace them with the notice and other provisions required by the LGPL.
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* If you do not delete the provisions above, a recipient may use your version
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* of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
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*
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* This library is free software; you can redistribute it and/or modify it
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* under the terms of the MPL as stated above or under the terms of the GNU
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* Library General Public License as published by the Free Software Foundation;
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* either version 2 of the License, or any later version.
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*
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* This library is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
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* details.
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*
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* If you didn't download this code from the following link, you should check if
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* you aren't using an obsolete version:
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* http://www.lowagie.com/iText/
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*/
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namespace iTextSharp.text.pdf {
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/** Implements the shading dictionary (or stream).
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*
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* @author Paulo Soares (psoares@consiste.pt)
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*/
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public class PdfShading {
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protected PdfDictionary shading;
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protected PdfWriter writer;
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protected int shadingType;
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protected ColorDetails colorDetails;
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protected PdfName shadingName;
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protected PdfIndirectReference shadingReference;
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/** Holds value of property bBox. */
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protected float[] bBox;
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/** Holds value of property antiAlias. */
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protected bool antiAlias = false;
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private Color cspace;
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/** Creates new PdfShading */
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protected PdfShading(PdfWriter writer) {
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this.writer = writer;
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}
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protected void SetColorSpace(Color color) {
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cspace = color;
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int type = ExtendedColor.GetType(color);
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PdfObject colorSpace = null;
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switch (type) {
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case ExtendedColor.TYPE_GRAY: {
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colorSpace = PdfName.DEVICEGRAY;
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break;
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}
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case ExtendedColor.TYPE_CMYK: {
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colorSpace = PdfName.DEVICECMYK;
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break;
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}
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case ExtendedColor.TYPE_SEPARATION: {
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SpotColor spot = (SpotColor)color;
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colorDetails = writer.AddSimple(spot.PdfSpotColor);
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colorSpace = colorDetails.IndirectReference;
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break;
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}
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case ExtendedColor.TYPE_PATTERN:
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case ExtendedColor.TYPE_SHADING: {
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ThrowColorSpaceError();
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break;
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}
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default:
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colorSpace = PdfName.DEVICERGB;
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break;
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}
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shading.Put(PdfName.COLORSPACE, colorSpace);
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}
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public Color ColorSpace {
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get {
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return cspace;
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}
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}
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public static void ThrowColorSpaceError() {
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throw new ArgumentException("A tiling or shading pattern cannot be used as a color space in a shading pattern");
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}
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public static void CheckCompatibleColors(Color c1, Color c2) {
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int type1 = ExtendedColor.GetType(c1);
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int type2 = ExtendedColor.GetType(c2);
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if (type1 != type2)
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throw new ArgumentException("Both colors must be of the same type.");
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if (type1 == ExtendedColor.TYPE_SEPARATION && ((SpotColor)c1).PdfSpotColor != ((SpotColor)c2).PdfSpotColor)
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throw new ArgumentException("The spot color must be the same, only the tint can vary.");
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if (type1 == ExtendedColor.TYPE_PATTERN || type1 == ExtendedColor.TYPE_SHADING)
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ThrowColorSpaceError();
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}
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public static float[] GetColorArray(Color color) {
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int type = ExtendedColor.GetType(color);
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switch (type) {
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case ExtendedColor.TYPE_GRAY: {
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return new float[]{((GrayColor)color).Gray};
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}
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case ExtendedColor.TYPE_CMYK: {
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CMYKColor cmyk = (CMYKColor)color;
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return new float[]{cmyk.Cyan, cmyk.Magenta, cmyk.Yellow, cmyk.Black};
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}
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case ExtendedColor.TYPE_SEPARATION: {
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return new float[]{((SpotColor)color).Tint};
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}
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case ExtendedColor.TYPE_RGB: {
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return new float[]{color.R / 255f, color.G / 255f, color.B / 255f};
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}
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}
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ThrowColorSpaceError();
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return null;
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}
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public static PdfShading Type1(PdfWriter writer, Color colorSpace, float[] domain, float[] tMatrix, PdfFunction function) {
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PdfShading sp = new PdfShading(writer);
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sp.shading = new PdfDictionary();
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sp.shadingType = 1;
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sp.shading.Put(PdfName.SHADINGTYPE, new PdfNumber(sp.shadingType));
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sp.SetColorSpace(colorSpace);
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if (domain != null)
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sp.shading.Put(PdfName.DOMAIN, new PdfArray(domain));
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if (tMatrix != null)
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sp.shading.Put(PdfName.MATRIX, new PdfArray(tMatrix));
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sp.shading.Put(PdfName.FUNCTION, function.Reference);
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return sp;
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}
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public static PdfShading Type2(PdfWriter writer, Color colorSpace, float[] coords, float[] domain, PdfFunction function, bool[] extend) {
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PdfShading sp = new PdfShading(writer);
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sp.shading = new PdfDictionary();
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sp.shadingType = 2;
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sp.shading.Put(PdfName.SHADINGTYPE, new PdfNumber(sp.shadingType));
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sp.SetColorSpace(colorSpace);
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sp.shading.Put(PdfName.COORDS, new PdfArray(coords));
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if (domain != null)
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sp.shading.Put(PdfName.DOMAIN, new PdfArray(domain));
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sp.shading.Put(PdfName.FUNCTION, function.Reference);
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if (extend != null && (extend[0] || extend[1])) {
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PdfArray array = new PdfArray(extend[0] ? PdfBoolean.PDFTRUE : PdfBoolean.PDFFALSE);
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array.Add(extend[1] ? PdfBoolean.PDFTRUE : PdfBoolean.PDFFALSE);
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sp.shading.Put(PdfName.EXTEND, array);
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}
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return sp;
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}
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public static PdfShading Type3(PdfWriter writer, Color colorSpace, float[] coords, float[] domain, PdfFunction function, bool[] extend) {
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PdfShading sp = Type2(writer, colorSpace, coords, domain, function, extend);
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sp.shadingType = 3;
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sp.shading.Put(PdfName.SHADINGTYPE, new PdfNumber(sp.shadingType));
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return sp;
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}
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public static PdfShading SimpleAxial(PdfWriter writer, float x0, float y0, float x1, float y1, Color startColor, Color endColor, bool extendStart, bool extendEnd) {
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CheckCompatibleColors(startColor, endColor);
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PdfFunction function = PdfFunction.Type2(writer, new float[]{0, 1}, null, GetColorArray(startColor),
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GetColorArray(endColor), 1);
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return Type2(writer, startColor, new float[]{x0, y0, x1, y1}, null, function, new bool[]{extendStart, extendEnd});
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}
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public static PdfShading SimpleAxial(PdfWriter writer, float x0, float y0, float x1, float y1, Color startColor, Color endColor) {
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return SimpleAxial(writer, x0, y0, x1, y1, startColor, endColor, true, true);
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}
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public static PdfShading SimpleRadial(PdfWriter writer, float x0, float y0, float r0, float x1, float y1, float r1, Color startColor, Color endColor, bool extendStart, bool extendEnd) {
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CheckCompatibleColors(startColor, endColor);
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PdfFunction function = PdfFunction.Type2(writer, new float[]{0, 1}, null, GetColorArray(startColor),
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GetColorArray(endColor), 1);
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return Type3(writer, startColor, new float[]{x0, y0, r0, x1, y1, r1}, null, function, new bool[]{extendStart, extendEnd});
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}
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public static PdfShading SimpleRadial(PdfWriter writer, float x0, float y0, float r0, float x1, float y1, float r1, Color startColor, Color endColor) {
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return SimpleRadial(writer, x0, y0, r0, x1, y1, r1, startColor, endColor, true, true);
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}
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internal PdfName ShadingName {
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get {
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return shadingName;
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}
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}
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internal PdfIndirectReference ShadingReference {
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get {
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if (shadingReference == null)
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shadingReference = writer.PdfIndirectReference;
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return shadingReference;
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}
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}
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internal int Name {
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set {
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shadingName = new PdfName("Sh" + value);
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}
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}
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internal void AddToBody() {
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if (bBox != null)
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shading.Put(PdfName.BBOX, new PdfArray(bBox));
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if (antiAlias)
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shading.Put(PdfName.ANTIALIAS, PdfBoolean.PDFTRUE);
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writer.AddToBody(shading, this.ShadingReference);
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}
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internal PdfWriter Writer {
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get {
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return writer;
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}
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}
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internal ColorDetails ColorDetails {
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get {
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return colorDetails;
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}
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}
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public float[] BBox {
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get {
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return bBox;
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}
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set {
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if (value.Length != 4)
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throw new ArgumentException("BBox must be a 4 element array.");
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this.bBox = value;
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}
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}
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public bool AntiAlias {
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set {
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this.antiAlias = value;
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}
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get {
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return antiAlias;
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}
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}
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}
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} |