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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* $Id$ */
package org.apache.fop.render.extensions.prepress;
import java.awt.Rectangle;
import java.text.MessageFormat;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.xmlgraphics.util.QName;
import org.apache.fop.fo.extensions.ExtensionElementMapping;
import org.apache.fop.fo.properties.FixedLength;
/**
* This class contains definition of page boundaries FOF's extension attributes for XSL-FO.
* That is: bleedBox, trimBox and cropBox.
* Also this class provides method to parse the possible values of these attributes
* and to generate original size of bounded area.
*/
public final class PageBoundariesAttributes {
/**
* The extension attribute for calculating the PDF BleedBox area - specifies the bleed width
*/
public static final QName EXT_BLEED
= new QName(ExtensionElementMapping.URI, null, "bleed");
/**
* The extension attribute for the PDF CropBox area
*/
public static final QName EXT_CROP_OFFSET
= new QName(ExtensionElementMapping.URI, null, "crop-offset");
/**
* The extension attribute for the PDF CropBox area
*/
public static final QName EXT_CROP_BOX
= new QName(ExtensionElementMapping.URI, null, "crop-box");
private static final Pattern SIZE_UNIT_PATTERN
= Pattern.compile("^(-?\\d*\\.?\\d*)(px|in|cm|mm|pt|pc|mpt)$");
/**
* Utility classes should not have a public or default constructor.
*/
private PageBoundariesAttributes() {
}
/**
* The BleedBox is calculated by expanding the TrimBox by the bleed widths.
*
* @param trimBox the TrimBox rectangle
* @param bleed the given bleed widths
* @return the calculated BleedBox rectangle
*/
public static Rectangle getBleedBoxRectangle(Rectangle trimBox, String bleed) {
return getRectagleUsingOffset(trimBox, bleed);
}
/**
* The MediaBox is calculated by expanding the TrimBox by the crop offsets.
*
* @param trimBox the TrimBox rectangle
* @param cropOffsets the given crop offsets
* @return the calculated MediaBox rectangle
*/
public static Rectangle getMediaBoxRectangle(Rectangle trimBox, String cropOffsets) {
return getRectagleUsingOffset(trimBox, cropOffsets);
}
/**
* The crop box controls how Acrobat display the page or how the Java2DRenderer
* sizes the output media. The PDF spec defines that the CropBox defaults to the MediaBox.
* <p/>
* The possible values of crop-box: (trim-box|bleed-box|media-box)
* Default value: media-box
*
* @param trimBox the TrimBox rectangle
* @param bleedBox the BleedBox rectangle
* @param mediaBox the MediaBox rectangle
* @param value the crop-box value
* @return the calculated CropBox rectangle
*/
public static Rectangle getCropBoxRectangle(final Rectangle trimBox, final Rectangle bleedBox,
final Rectangle mediaBox, final String value) {
final String err = "The crop-box has invalid value: {0}, "
+ "possible values of crop-box: (trim-box|bleed-box|media-box)";
if ("trim-box".equals(value)) {
return trimBox;
} else if ("bleed-box".equals(value)) {
return bleedBox;
} else if ("media-box".equals(value) || value == null || "".equals(value)) {
return mediaBox;
} else {
throw new IllegalArgumentException(MessageFormat.format(err, new Object[]{value}));
}
}
/**
* The crop box controls how Acrobat display the page or how the Java2DRenderer
* sizes the output media. The PDF spec defines that the CropBox defaults to the MediaBox
* <p/>
* The possible values of crop-box: (trim-box|bleed-box|media-box)
* Default value: media-box
*
* @param trimBox the TrimBox rectangle
* @param bleed the given bleed widths
* @param cropOffset the given crop offsets
* @param value the crop-box value
* @return the calculated CropBox rectangle
*/
public static Rectangle getCropBoxRectangle(final Rectangle trimBox, final String bleed,
final String cropOffset, final String value) {
Rectangle bleedBox = getBleedBoxRectangle(trimBox, bleed);
Rectangle mediaBox = getMediaBoxRectangle(trimBox, cropOffset);
return getCropBoxRectangle(trimBox, bleedBox, mediaBox, value);
}
private static Rectangle getRectagleUsingOffset(Rectangle originalRect, String offset) {
if (offset == null || "".equals(offset) || originalRect == null) {
return originalRect;
}
String[] bleeds = offset.split(" ");
int[] coords = new int[4]; // top, rigth, bottom, left
if (bleeds.length == 1) {
coords[0] = getLengthIntValue(bleeds[0]);
coords[1] = coords[0];
coords[2] = coords[0];
coords[3] = coords[0];
} else if (bleeds.length == 2) {
coords[0] = getLengthIntValue(bleeds[0]);
coords[2] = coords[0];
coords[1] = getLengthIntValue(bleeds[1]);
coords[3] = coords[1];
} else if (bleeds.length == 3) {
coords[0] = getLengthIntValue(bleeds[0]);
coords[1] = getLengthIntValue(bleeds[1]);
coords[3] = coords[1];
coords[2] = getLengthIntValue(bleeds[2]);
} else if (bleeds.length == 4) {
coords[0] = getLengthIntValue(bleeds[0]);
coords[1] = getLengthIntValue(bleeds[1]);
coords[2] = getLengthIntValue(bleeds[2]);
coords[3] = getLengthIntValue(bleeds[3]);
}
return new Rectangle((int) (originalRect.getX() - coords[3]),
(int) (originalRect.getY() - coords[0]),
(int) (originalRect.getWidth() + coords[3] + coords[1]),
(int) (originalRect.getHeight() + coords[0] + coords[2]));
}
private static int getLengthIntValue(final String length) {
final String err = "Incorrect length value: {0}";
Matcher m = SIZE_UNIT_PATTERN.matcher(length);
if (m.find()) {
return FixedLength.getInstance(Double.parseDouble(m.group(1)),
m.group(2)).getLength().getValue();
} else {
throw new IllegalArgumentException(MessageFormat.format(err, new Object[]{length}));
}
}
}
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