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Diffstat (limited to 'src/java/org/apache/fop/rtf/renderer/FoUnitsConverter.java')
| -rw-r--r-- | src/java/org/apache/fop/rtf/renderer/FoUnitsConverter.java | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/src/java/org/apache/fop/rtf/renderer/FoUnitsConverter.java b/src/java/org/apache/fop/rtf/renderer/FoUnitsConverter.java new file mode 100644 index 000000000..99bec8fd4 --- /dev/null +++ b/src/java/org/apache/fop/rtf/renderer/FoUnitsConverter.java @@ -0,0 +1,177 @@ +/* + * ============================================================================ + * The Apache Software License, Version 1.1 + * ============================================================================ + * + * Copyright (C) 1999-2003 The Apache Software Foundation. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without modifica- + * tion, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * + * 3. The end-user documentation included with the redistribution, if any, must + * include the following acknowledgment: "This product includes software + * developed by the Apache Software Foundation (http://www.apache.org/)." + * Alternately, this acknowledgment may appear in the software itself, if + * and wherever such third-party acknowledgments normally appear. + * + * 4. The names "FOP" and "Apache Software Foundation" must not be used to + * endorse or promote products derived from this software without prior + * written permission. For written permission, please contact + * apache@apache.org. + * + * 5. Products derived from this software may not be called "Apache", nor may + * "Apache" appear in their name, without prior written permission of the + * Apache Software Foundation. + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, + * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND + * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * APACHE SOFTWARE FOUNDATION OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLU- + * DING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON + * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * ============================================================================ + * + * This software consists of voluntary contributions made by many individuals + * on behalf of the Apache Software Foundation and was originally created by + * James Tauber <jtauber@jtauber.com>. For more information on the Apache + * Software Foundation, please see <http://www.apache.org/>. + */ +package org.apache.fop.rtf.renderer; + +import java.util.*; + +//FOP +import org.apache.fop.apps.FOPException; + + +/** Converts XSL-FO units to RTF units + * + * @author Bertrand Delacretaz <bdelacretaz@codeconsult.ch> + * @author putzi + * @author Peter Herweg <pherweg@web.de> + * + * This class was originally developed by Bertrand Delacretaz bdelacretaz@codeconsult.ch + * for the JFOR project and is now integrated into FOP. + */ + +class FoUnitsConverter +{ + private static final FoUnitsConverter m_instance = new FoUnitsConverter(); + + /** points to twips: 1 twip is 1/20 of a point */ + public static final float POINT_TO_TWIPS = 20f; + + /** millimeters and centimeters to twips: , one point is 1/72 of an inch, one inch is 25.4 mm */ + public static final float IN_TO_TWIPS = 72f * POINT_TO_TWIPS; + public static final float MM_TO_TWIPS = IN_TO_TWIPS / 25.4f; + public static final float CM_TO_TWIPS = 10 * MM_TO_TWIPS; + + + /** conversion factors keyed by xsl:fo units names */ + private static final Map m_twipFactors = new HashMap(); + static { + m_twipFactors.put("mm",new Float(MM_TO_TWIPS)); + m_twipFactors.put("cm",new Float(CM_TO_TWIPS)); + m_twipFactors.put("pt",new Float(POINT_TO_TWIPS)); + m_twipFactors.put("in",new Float(IN_TO_TWIPS)); + } + + /** singleton pattern */ + private FoUnitsConverter() + { + } + + /** singleton pattern */ + static FoUnitsConverter getInstance() + { + return m_instance; + } + + /** convert given value to RTF units + * @param foValue a value like "12mm" + * TODO: tested with "mm" units only, needs work to comply with FO spec + * Why does it search for period instead of simply breaking last two + * Characters into another units string? - Chris + */ + float convertToTwips(String foValue) + throws FOPException + { + foValue = foValue.trim(); + + // break value into number and units + final StringBuffer number = new StringBuffer(); + final StringBuffer units = new StringBuffer(); + + for(int i=0; i < foValue.length(); i++) { + final char c = foValue.charAt(i); + if(Character.isDigit(c) || c == '.') { + number.append(c); + } else { + // found the end of the digits + units.append(foValue.substring(i).trim()); + break; + } + } + + return numberToTwips(number.toString(),units.toString()); + } + + + /** convert given value to twips according to given units */ + private float numberToTwips(String number,String units) + throws FOPException + { + float result = 0; + + // convert number to integer + try { + if(number != null && number.trim().length() > 0) { + result = Float.valueOf(number).floatValue(); + } + } catch(Exception e) { + throw new FOPException("number format error: cannot convert '" + number + "' to float value"); + } + + // find conversion factor + if(units != null && units.trim().length() > 0) { + final Float factor = (Float)m_twipFactors.get(units.toLowerCase()); + if(factor == null) throw new FOPException("conversion factor not found for '" + units + "' units"); + result *= factor.floatValue(); + } + + return result; + } + + /** convert a font size given in points like "12pt" */ + int convertFontSize(String size) + throws FOPException + { + size = size.trim(); + final String FONT_SUFFIX = "pt"; + if(!size.endsWith(FONT_SUFFIX)) { + throw new FOPException("Invalid font size '" + size + "', must end with '" + FONT_SUFFIX + "'"); + } + + float result = 0; + size = size.substring(0,size.length() - FONT_SUFFIX.length()); + try { + result = (Float.valueOf(size).floatValue()); + } catch(Exception e) { + throw new FOPException("Invalid font size value '" + size + "'"); + } + + // RTF font size units are in half-points + return (int)(result * 2.0); + } +} |