/* * Copyright 2002 Paulo Soares * * The contents of this file are subject to the Mozilla Public License Version 1.1 * (the "License"); you may not use this file except in compliance with the License. * You may obtain a copy of the License at http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the License. * * The Original Code is 'iText, a free JAVA-PDF library'. * * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie. * All Rights Reserved. * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved. * * Contributor(s): all the names of the contributors are added in the source code * where applicable. * * Alternatively, the contents of this file may be used under the terms of the * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the * provisions of LGPL are applicable instead of those above.  If you wish to * allow use of your version of this file only under the terms of the LGPL * License and not to allow others to use your version of this file under * the MPL, indicate your decision by deleting the provisions above and * replace them with the notice and other provisions required by the LGPL. * If you do not delete the provisions above, a recipient may use your version * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE. * * This library is free software; you can redistribute it and/or modify it * under the terms of the MPL as stated above or under the terms of the GNU * Library General Public License as published by the Free Software Foundation; * either version 2 of the License, or any later version. * * This library is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS * FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more * details. * * If you didn't download this code from the following link, you should check if * you aren't using an obsolete version: * http://www.lowagie.com/iText/ */package com.lowagie.text.pdf;import java.awt.Color;import java.io.IOException;/** Implements the shading dictionary (or stream). * * @author Paulo Soares (psoares@consiste.pt) */public class PdfShading {    protected PdfDictionary shading;        protected PdfWriter writer;        protected int shadingType;        protected ColorDetails colorDetails;        protected PdfName shadingName;        protected PdfIndirectReference shadingReference;        /** Holds value of property bBox. */    protected float[] bBox;        /** Holds value of property antiAlias. */    protected boolean antiAlias = false;        /** Creates new PdfShading */    protected PdfShading(PdfWriter writer) {        this.writer = writer;    }        protected void setColorSpace(Color color) {        int type = ExtendedColor.getType(color);        PdfObject colorSpace = null;        switch (type) {            case ExtendedColor.TYPE_GRAY: {                colorSpace = PdfName.DEVICEGRAY;                break;            }            case ExtendedColor.TYPE_CMYK: {                colorSpace = PdfName.DEVICECMYK;                break;            }            case ExtendedColor.TYPE_SEPARATION: {                SpotColor spot = (SpotColor)color;                colorDetails = writer.addSimple(spot.getPdfSpotColor());                colorSpace = colorDetails.getIndirectReference();                break;            }            case ExtendedColor.TYPE_PATTERN:            case ExtendedColor.TYPE_SHADING: {                throwColorSpaceError();            }            default:                colorSpace = PdfName.DEVICERGB;                break;        }        shading.put(PdfName.COLORSPACE, colorSpace);    }        public static void throwColorSpaceError() {        throw new IllegalArgumentException("A tiling or shading pattern cannot be used as a color space in a shading pattern");    }        public static void checkCompatibleColors(Color c1, Color c2) {        int type1 = ExtendedColor.getType(c1);        int type2 = ExtendedColor.getType(c2);        if (type1 != type2)            throw new IllegalArgumentException("Both colors must be of the same type.");        if (type1 == ExtendedColor.TYPE_SEPARATION && ((SpotColor)c1).getPdfSpotColor() != ((SpotColor)c2).getPdfSpotColor())            throw new IllegalArgumentException("The spot color must be the same, only the tint can vary.");        if (type1 == ExtendedColor.TYPE_PATTERN || type1 == ExtendedColor.TYPE_SHADING)            throwColorSpaceError();    }        public static float[] getColorArray(Color color) {        int type = ExtendedColor.getType(color);        switch (type) {            case ExtendedColor.TYPE_GRAY: {                return new float[]{((GrayColor)color).getGray()};            }            case ExtendedColor.TYPE_CMYK: {                CMYKColor cmyk = (CMYKColor)color;                return new float[]{cmyk.getCyan(), cmyk.getMagenta(), cmyk.getYellow(), cmyk.getBlack()};            }            case ExtendedColor.TYPE_SEPARATION: {                return new float[]{((SpotColor)color).getTint()};            }            case ExtendedColor.TYPE_RGB: {                return new float[]{color.getRed() / 255f, color.getGreen() / 255f, color.getBlue() / 255f};            }        }        throwColorSpaceError();        return null;    }    public static PdfShading type1(PdfWriter writer, Color colorSpace, float domain[], float tMatrix[], PdfFunction function) {        PdfShading sp = new PdfShading(writer);        sp.shading = new PdfDictionary();        sp.shadingType = 1;        sp.shading.put(PdfName.SHADINGTYPE, new PdfNumber(sp.shadingType));        sp.setColorSpace(colorSpace);        if (domain != null)            sp.shading.put(PdfName.DOMAIN, new PdfArray(domain));        if (tMatrix != null)            sp.shading.put(PdfName.MATRIX, new PdfArray(tMatrix));        sp.shading.put(PdfName.FUNCTION, function.getReference());        return sp;    }        public static PdfShading type2(PdfWriter writer, Color colorSpace, float coords[], float domain[], PdfFunction function, boolean extend[]) {        PdfShading sp = new PdfShading(writer);        sp.shading = new PdfDictionary();        sp.shadingType = 2;        sp.shading.put(PdfName.SHADINGTYPE, new PdfNumber(sp.shadingType));        sp.setColorSpace(colorSpace);        sp.shading.put(PdfName.COORDS, new PdfArray(coords));        if (domain != null)            sp.shading.put(PdfName.DOMAIN, new PdfArray(domain));        sp.shading.put(PdfName.FUNCTION, function.getReference());        if (extend != null && (extend[0] || extend[1])) {            PdfArray array = new PdfArray(extend[0] ? PdfBoolean.PDFTRUE : PdfBoolean.PDFFALSE);            array.add(extend[1] ? PdfBoolean.PDFTRUE : PdfBoolean.PDFFALSE);            sp.shading.put(PdfName.EXTEND, array);        }        return sp;    }    public static PdfShading type3(PdfWriter writer, Color colorSpace, float coords[], float domain[], PdfFunction function, boolean extend[]) {        PdfShading sp = type2(writer, colorSpace, coords, domain, function, extend);        sp.shadingType = 3;        sp.shading.put(PdfName.SHADINGTYPE, new PdfNumber(sp.shadingType));        return sp;    }        public static PdfShading simpleAxial(PdfWriter writer, float x0, float y0, float x1, float y1, Color startColor, Color endColor, boolean extendStart, boolean extendEnd) {        checkCompatibleColors(startColor, endColor);        PdfFunction function = PdfFunction.type2(writer, new float[]{0, 1}, null, getColorArray(startColor),            getColorArray(endColor), 1);        return type2(writer, startColor, new float[]{x0, y0, x1, y1}, null, function, new boolean[]{extendStart, extendEnd});    }        public static PdfShading simpleAxial(PdfWriter writer, float x0, float y0, float x1, float y1, Color startColor, Color endColor) {        return simpleAxial(writer, x0, y0, x1, y1, startColor, endColor, true, true);    }        public static PdfShading simpleRadial(PdfWriter writer, float x0, float y0, float r0, float x1, float y1, float r1, Color startColor, Color endColor, boolean extendStart, boolean extendEnd) {        checkCompatibleColors(startColor, endColor);        PdfFunction function = PdfFunction.type2(writer, new float[]{0, 1}, null, getColorArray(startColor),            getColorArray(endColor), 1);        return type3(writer, startColor, new float[]{x0, y0, r0, x1, y1, r1}, null, function, new boolean[]{extendStart, extendEnd});    }    public static PdfShading simpleRadial(PdfWriter writer, float x0, float y0, float r0, float x1, float y1, float r1, Color startColor, Color endColor) {        return simpleRadial(writer, x0, y0, r0, x1, y1, r1, startColor, endColor, true, true);    }    PdfName getShadingName() {        return shadingName;    }        PdfIndirectReference getShadingReference() {        if (shadingReference == null)            shadingReference = writer.getPdfIndirectReference();        return shadingReference;    }        void setName(int number) {        shadingName = new PdfName("Sh" + number);    }        void addToBody() throws IOException {        if (bBox != null)            shading.put(PdfName.BBOX, new PdfArray(bBox));        if (antiAlias)            shading.put(PdfName.ANTIALIAS, PdfBoolean.PDFTRUE);        writer.addToBody(shading, getShadingReference());    }        PdfWriter getWriter() {        return writer;    }        ColorDetails getColorDetails() {        return colorDetails;    }        public float[] getBBox() {        return bBox;    }        public void setBBox(float[] bBox) {        if (bBox.length != 4)            throw new IllegalArgumentException("BBox must be a 4 element array.");        this.bBox = bBox;    }        public boolean isAntiAlias() {        return antiAlias;    }        public void setAntiAlias(boolean antiAlias) {        this.antiAlias = antiAlias;    }    }