tesseract  5.0.0
ocrpara.cpp
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1 // File: ocrpara.cpp
3 // Description: OCR Paragraph Output Type
4 // Author: David Eger
5 //
6 // (C) Copyright 2010, Google Inc.
7 // Licensed under the Apache License, Version 2.0 (the "License");
8 // you may not use this file except in compliance with the License.
9 // You may obtain a copy of the License at
10 // http://www.apache.org/licenses/LICENSE-2.0
11 // Unless required by applicable law or agreed to in writing, software
12 // distributed under the License is distributed on an "AS IS" BASIS,
13 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 // See the License for the specific language governing permissions and
15 // limitations under the License.
16 //
18 
19 #include "ocrpara.h"
20 
21 #include "host.h" // For NearlyEqual()
22 
23 #include <cstdio>
24 
25 namespace tesseract {
26 
31 
32 static const char *ParagraphJustificationToString(tesseract::ParagraphJustification justification) {
33  switch (justification) {
34  case JUSTIFICATION_LEFT:
35  return "LEFT";
37  return "RIGHT";
39  return "CENTER";
40  default:
41  return "UNKNOWN";
42  }
43 }
44 
45 bool ParagraphModel::ValidFirstLine(int lmargin, int lindent, int rindent, int rmargin) const {
46  switch (justification_) {
47  case JUSTIFICATION_LEFT:
48  return NearlyEqual(lmargin + lindent, margin_ + first_indent_, tolerance_);
50  return NearlyEqual(rmargin + rindent, margin_ + first_indent_, tolerance_);
52  return NearlyEqual(lindent, rindent, tolerance_ * 2);
53  default:
54  // shouldn't happen
55  return false;
56  }
57 }
58 
59 bool ParagraphModel::ValidBodyLine(int lmargin, int lindent, int rindent, int rmargin) const {
60  switch (justification_) {
61  case JUSTIFICATION_LEFT:
62  return NearlyEqual(lmargin + lindent, margin_ + body_indent_, tolerance_);
64  return NearlyEqual(rmargin + rindent, margin_ + body_indent_, tolerance_);
66  return NearlyEqual(lindent, rindent, tolerance_ * 2);
67  default:
68  // shouldn't happen
69  return false;
70  }
71 }
72 
73 bool ParagraphModel::Comparable(const ParagraphModel &other) const {
74  if (justification_ != other.justification_) {
75  return false;
76  }
77  if (justification_ == JUSTIFICATION_CENTER || justification_ == JUSTIFICATION_UNKNOWN) {
78  return true;
79  }
80  int tolerance = (tolerance_ + other.tolerance_) / 4;
81  return NearlyEqual(margin_ + first_indent_, other.margin_ + other.first_indent_, tolerance) &&
82  NearlyEqual(margin_ + body_indent_, other.margin_ + other.body_indent_, tolerance);
83 }
84 
85 std::string ParagraphModel::ToString() const {
86  char buffer[200];
87  const char *alignment = ParagraphJustificationToString(justification_);
88  snprintf(buffer, sizeof(buffer), "margin: %d, first_indent: %d, body_indent: %d, alignment: %s",
89  margin_, first_indent_, body_indent_, alignment);
90  return std::string(buffer);
91 }
92 
93 } // namespace tesseract
bool NearlyEqual(T x, T y, T tolerance)
Definition: host.h:51
ParagraphJustification
Definition: publictypes.h:248
@ JUSTIFICATION_LEFT
Definition: publictypes.h:250
@ JUSTIFICATION_UNKNOWN
Definition: publictypes.h:249
@ JUSTIFICATION_RIGHT
Definition: publictypes.h:252
@ JUSTIFICATION_CENTER
Definition: publictypes.h:251
bool Comparable(const ParagraphModel &other) const
Definition: ocrpara.cpp:73
bool ValidFirstLine(int lmargin, int lindent, int rindent, int rmargin) const
Definition: ocrpara.cpp:45
int tolerance() const
Definition: ocrpara.h:178
std::string ToString() const
Definition: ocrpara.cpp:85
bool ValidBodyLine(int lmargin, int lindent, int rindent, int rmargin) const
Definition: ocrpara.cpp:59