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comparison mupdf-source/thirdparty/tesseract/src/ccstruct/quadlsq.h @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1:1d09e1dec1d9 2:b50eed0cc0ef
1 /**********************************************************************
2 * File: quadlsq.h (Formerly qlsq.h)
3 * Description: Code for least squares approximation of quadratics.
4 * Author: Ray Smith
5 *
6 * (C) Copyright 1993, Hewlett-Packard Ltd.
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 *
17 **********************************************************************/
18
19 #ifndef QUADLSQ_H
20 #define QUADLSQ_H
21
22 #include "points.h"
23
24 namespace tesseract {
25
26 class QLSQ {
27 public:
28 QLSQ() { // constructor
29 clear(); // set to zeros
30 }
31 void clear(); // initialize
32
33 void add( // add element
34 double x, // coords to add
35 double y);
36 void remove( // delete element
37 double x, // coords to delete
38 double y);
39 int32_t count() { // no of elements
40 return n;
41 }
42
43 void fit( // fit the given
44 int degree); // return actual
45 double get_a() const { // get x squard
46 return a;
47 }
48 double get_b() const { // get x squard
49 return b;
50 }
51 double get_c() const { // get x squard
52 return c;
53 }
54
55 private:
56 int32_t n; // no of elements
57 double a, b, c; // result
58 double sigx; // sum of x
59 double sigy; // sum of y
60 double sigxx; // sum x squared
61 double sigxy; // sum of xy
62 double sigyy; // sum y squared
63 long double sigxxx; // sum x cubed
64 long double sigxxy; // sum xsquared y
65 long double sigxxxx; // sum x fourth
66 };
67
68 } // namespace tesseract
69
70 #endif