/* * 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.util; 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 <a href="mailto:ben@benlitchfield.com">Ben Litchfield</a> * @version $Revision: 1.7 $ */ public class TextPositionComparator implements Comparator { /** * {@inheritDoc} */ public int compare(Object o1, Object o2) { int retval = 0; TextPosition pos1 = (TextPosition)o1; TextPosition pos2 = (TextPosition)o2; /* 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 ) { retval = -1; } else if( x1 > x2 ) { retval = 1; } else { retval = 0; } } else if( pos1YBottom < pos2YBottom ) { retval = -1; } else { return 1; } return retval; } }