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/*
Copyright © 2008-13 Qtrac Ltd. All rights reserved.
This program or module is free software: you can redistribute it
and/or modify it under the terms of the GNU General Public License
as published by the Free Software Foundation, either version 2 of
the License, or (at your option) any later version. This program is
distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
*/
#include "textitem.hpp"
#include <QDir>
#include <QFile>
#include <QTextStream>
QStringList TextItems::texts() const
{
QStringList list;
foreach (const TextItem &item, items)
list << item.text;
return list;
}
QList<QRectF> TextItems::rects() const
{
QList<QRectF> list;
foreach (const TextItem &item, items)
list << item.rect;
return list;
}
struct Key
{
Key(const int a, const int b, const int c) : a(a), b(b), c(c) {}
bool operator<(const Key &other) const {
if (a != other.a) return a < other.a;
if (b != other.b) return b < other.b;
return c < other.c;
}
int a, b, c;
};
void TextItems::columnZoneYxOrder(const int Width, const int ToleranceR,
const int ToleranceY, const int Columns)
{
// Phase #1: Sort all the texts into (column, y, x) order
columnYxOrder(Width, ToleranceY, Columns);
// Phase #2: Sort all the texts into (column, zone, y, x) order
QList<QPainterPath> zones = generateZones(Width, ToleranceR,
ToleranceY, Columns);
QMap<Key, TextItem> itemForZoneYx;
foreach (const TextItem &item, items) {
const QRectF rect = item.rect.adjusted(-ToleranceR, -ToleranceR,
ToleranceR, ToleranceR);
const int y = normalizedY(static_cast<int>(item.rect.y()),
ToleranceY);
for (int i = 0; i < zones.count(); ++i) {
if (zones.at(i).intersects(rect)) {
itemForZoneYx.insert(Key(i, y, item.rect.x()), item);
break;
}
}
}
items = itemForZoneYx.values();
}
void TextItems::columnYxOrder(const int Width, const int ToleranceY,
const int Columns)
{
// Phase #1: Sort all the texts into (column, y, x) order
const int Span = Width / Columns;
QMap<Key, TextItem> itemForColumnYx;
foreach (const TextItem &item, items) {
const QRect &rect = item.toRect();
const int Column = ((Columns == 1) ? 0
: (rect.width() > Span) ? Columns : rect.right() / Span);
const int y = normalizedY(static_cast<int>(rect.y()), ToleranceY);
itemForColumnYx.insert(Key(Column, y, rect.x()), item);
}
items = itemForColumnYx.values();
}
const QList<QPainterPath> TextItems::generateZones(const int Width,
const int ToleranceR, const int ToleranceY,
const int Columns) const
{ // Assumes that items are already in column, y, x order!
// Phase #1: Generate the zones
QList<QPainterPath> zones;
foreach (const TextItem &item, items) {
if (zones.isEmpty()) { // First word becomes first zone
QPainterPath zone;
zone.addRect(item.rect);
zones << zone;
} else { // Add to an existing zone within tolerance or a new one
const QRectF tolerantRect = item.rect.adjusted(-ToleranceR,
-ToleranceR, ToleranceR, ToleranceR);
bool found = false;
for (int i = 0; i < zones.count(); ++i) {
QPainterPath zone = zones.at(i);
if (zone.intersects(tolerantRect)) {
zone.addRect(item.rect);
zones[i] = zone;
found = true;
break;
}
}
if (!found) {
QPainterPath zone;
zone.addRect(item.rect);
zones << zone;
}
}
}
// Phase #2: Order the zones by (column, y, x)
const int Span = Width / Columns;
QMultiMap<Key, QPainterPath> zonesForColumn;
foreach (const QPainterPath &zone, zones) {
const QRect &rect = zone.boundingRect().toRect();
const int Column = ((Columns == 1) ? 0
: (rect.width() > Span) ? Columns : rect.right() / Span);
const int y = normalizedY(static_cast<int>(rect.y()), ToleranceY);
zonesForColumn.insertMulti(Key(Column, y, rect.x()), zone);
}
return zonesForColumn.values();
}
void TextItems::debug(const int page, const int ToleranceY,
const bool ComparingWords, const bool Yx)
{
QString filename = QDir::tempPath() + QString("/page1-%1.txt")
.arg(page);
int count = 1;
while (QFile::exists(filename)) {
filename = QDir::tempPath() + QString("/page%2-%1.txt").arg(page)
.arg(++count);
}
QFile file(filename);
if (!file.open(QIODevice::WriteOnly|QIODevice::Text)) {
qDebug("%s", qPrintable(QString("cannot write debug file: %1")
.arg(file.errorString())));
}
QTextStream out(&file);
out.setCodec("UTF-8");
out << "Page #" << page << ": "
<< (ComparingWords ? "Words" : "Characters") << " mode\n";
for (int i = 0; i < items.count(); ++i) {
const TextItem &item = items.at(i);
const QRect rect = item.toRect();
out << item.text;
if (!ComparingWords)
out << QString(" %1").arg(item.text.at(0).unicode(), 4, 16,
QChar('0'));
if (Yx) {
const int y = normalizedY(static_cast<int>(item.rect.y()),
ToleranceY);
out << QString(" (%1, %2)").arg(y).arg(rect.x());
}
out << "\n";
}
qDebug("%s", qPrintable(QString("wrote '%1'").arg(filename)));
}
inline int normalizedY(const int y, const int ToleranceY)
{
if (ToleranceY == 0)
return y;
const int remainder = y % ToleranceY;
return (remainder == 0) ? y : y + ToleranceY - remainder;
}
const TextItems getWords(const TextBoxList &list)
{
TextItems items;
foreach (const PdfTextBox &box, list) {
QString word = box->text().trimmed();
for (int i = 0; i < word.length(); ++i)
word[i] = canonicalizedCharacter(word[i]);
// DON'T DO: if (!word.isEmpty()) words << word;
// since it can mess up highlighting.
items.append(TextItem(word, box->boundingBox()));
}
return items;
}
const TextItems getCharacters(const TextBoxList &list)
{
TextItems items;
foreach (const PdfTextBox &box, list) {
const QString word = box->text();
int limit = word.count() - 1;
for (int i = limit; i >= 0; --i)
if (!word[i].isSpace())
break;
for (int i = 0; i <= limit; ++i) {
items.append(TextItem(QString(canonicalizedCharacter(word[i])),
box->charBoundingBox(i)));
}
}
return items;
}
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