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/*
* $Id: CTMHelper.java,v 1.2 2003/03/07 09:46:32 jeremias Exp $
* ============================================================================
* 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.render.pdf;
import org.apache.fop.area.CTM;
import org.apache.fop.pdf.PDFNumber;
/**
* CTMHelper converts FOP transformation matrixis to those
* suitable for use by the PDFRender. The e and f elements
* of the matrix will be divided by 1000 as FOP uses millipoints
* as it's default user space and PDF uses points.
*
* @see org.apache.fop.area.CTM
*
* @author <a href="kevin@rocketred.com>Kevin O'Neill</a>
*/
public final class CTMHelper {
/**
* <p>Converts the sourceMatrix to a string for use in the PDFRender cm operations.</p>
* <p>For example:
* <pre>
* org.apache.fop.area.CTM ctm =
* new org.apache.fop.area.CTM(1.0, 0.0, 0.0, 1.0, 1000.0, 1000.0);
* String pdfMatrix = org.apache.fop.render.pdf.CTMHelper.toPDFString(ctm);
* </pre>
* will return the string "<code>1.0 0.0 0.0 1.0 1.0 1.0</code>".
*
* @param sourceMatrix - The matrix to convert.
*
* @return a space seperated string containing the matrix elements.
*/
public static String toPDFString(CTM sourceMatrix) {
if (null == sourceMatrix) {
throw new NullPointerException("sourceMatrix must not be null");
}
final double matrix[] = toPDFArray(sourceMatrix);
return PDFNumber.doubleOut(matrix[0], 8) + " " +
PDFNumber.doubleOut(matrix[1], 8) + " " +
PDFNumber.doubleOut(matrix[2], 8) + " " +
PDFNumber.doubleOut(matrix[3], 8) + " " +
PDFNumber.doubleOut(matrix[4], 8) + " " +
PDFNumber.doubleOut(matrix[5], 8);
}
/**
* <p>Creates a new CTM based in the sourceMatrix.</p>
* <p>For example:
* <pre>
* org.apache.fop.area.CTM inCTM =
* new org.apache.fop.area.CTM(1.0, 0.0, 0.0, 1.0, 1000.0, 1000.0);
* org.apache.fop.area.CTM outCTM =
* org.apache.fop.render.pdf.CTMHelper.toPDFCTM(ctm);
* </pre>
* will return a new CTM where a == 1.0, b == 0.0, c == 0.0, d == 1.0, e == 1.0 and f == 1.0.
*
* @param sourceMatrix - The matrix to convert.
*
* @return a new converted matrix.
*/
public static CTM toPDFCTM(CTM sourceMatrix) {
if (null == sourceMatrix) {
throw new NullPointerException("sourceMatrix must not be null");
}
final double matrix[] = toPDFArray(sourceMatrix);
return new CTM(matrix[0], matrix[1], matrix[2], matrix[3],
matrix[4], matrix[5]);
}
/**
* <p>Creates an array of six doubles from the source CTM.</p>
* <p>For example:
* <pre>
* org.apache.fop.area.CTM inCTM =
* new org.apache.fop.area.CTM(1.0, 0.0, 0.0, 1.0, 1000.0, 1000.0);
* double matrix[] = org.apache.fop.render.pdf.CTMHelper.toPDFArray(ctm);
* </pre>
* will return a new array where matrix[0] == 1.0, matrix[1] == 0.0,
* matrix[2] == 0.0, matrix[3] == 1.0,
* matrix[4] == 1.0 and matrix[5] == 1.0.
*
* @param sourceMatrix - The matrix to convert.
* @return an array of doubles containing the converted matrix.
*/
public static double[] toPDFArray(CTM sourceMatrix) {
if (null == sourceMatrix) {
throw new NullPointerException("sourceMatrix must not be null");
}
final double matrix[] = sourceMatrix.toArray();
return new double[]{matrix[0], matrix[1], matrix[2], matrix[3],
matrix[4] / 1000.0, matrix[5] / 1000.0};
}
}
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