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The Apache PDFBox library is an open source Java tool for working with PDF documents.
/*
* 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.
*/
package org.apache.pdfbox.text;
import java.util.Comparator;
/**
* This class is a comparator for TextPosition operators. It handles
* pages with text in different directions by grouping the text based
* on direction and sorting in that direction. This allows continuous text
* in a given direction to be more easily grouped together.
*
* @author Ben Litchfield
*/
public class TextPositionComparator implements Comparator
{
@Override
public int compare(TextPosition pos1, TextPosition pos2)
{
// only compare text that is in the same direction
if (pos1.getDir() < pos2.getDir())
{
return -1;
}
else if (pos1.getDir() > pos2.getDir())
{
return 1;
}
// get the text direction adjusted coordinates
float x1 = pos1.getXDirAdj();
float x2 = pos2.getXDirAdj();
float pos1YBottom = pos1.getYDirAdj();
float pos2YBottom = pos2.getYDirAdj();
// note that the coordinates have been adjusted so 0,0 is in upper left
float pos1YTop = pos1YBottom - pos1.getHeightDir();
float pos2YTop = pos2YBottom - pos2.getHeightDir();
float yDifference = Math.abs(pos1YBottom - pos2YBottom);
// we will do a simple tolerance comparison
if (yDifference < .1 ||
pos2YBottom >= pos1YTop && pos2YBottom <= pos1YBottom ||
pos1YBottom >= pos2YTop && pos1YBottom <= pos2YBottom)
{
if (x1 < x2)
{
return -1;
}
else if (x1 > x2)
{
return 1;
}
else
{
return 0;
}
}
else if (pos1YBottom < pos2YBottom)
{
return - 1;
}
else
{
return 1;
}
}
}