Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/ccstruct/quadlsq.h @ 46:7ee69f120f19 default tip

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>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
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1 /**********************************************************************
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2 * File: quadlsq.h (Formerly qlsq.h)
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3 * Description: Code for least squares approximation of quadratics.
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4 * Author: Ray Smith
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5 *
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6 * (C) Copyright 1993, Hewlett-Packard Ltd.
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7 ** Licensed under the Apache License, Version 2.0 (the "License");
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8 ** you may not use this file except in compliance with the License.
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9 ** You may obtain a copy of the License at
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10 ** http://www.apache.org/licenses/LICENSE-2.0
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11 ** Unless required by applicable law or agreed to in writing, software
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12 ** distributed under the License is distributed on an "AS IS" BASIS,
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13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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14 ** See the License for the specific language governing permissions and
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15 ** limitations under the License.
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16 *
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17 **********************************************************************/
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19 #ifndef QUADLSQ_H
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20 #define QUADLSQ_H
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22 #include "points.h"
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24 namespace tesseract {
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26 class QLSQ {
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27 public:
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28 QLSQ() { // constructor
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29 clear(); // set to zeros
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30 }
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31 void clear(); // initialize
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33 void add( // add element
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34 double x, // coords to add
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35 double y);
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36 void remove( // delete element
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37 double x, // coords to delete
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38 double y);
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39 int32_t count() { // no of elements
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40 return n;
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41 }
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43 void fit( // fit the given
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44 int degree); // return actual
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45 double get_a() const { // get x squard
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46 return a;
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47 }
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48 double get_b() const { // get x squard
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49 return b;
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50 }
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51 double get_c() const { // get x squard
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52 return c;
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53 }
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55 private:
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56 int32_t n; // no of elements
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57 double a, b, c; // result
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58 double sigx; // sum of x
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59 double sigy; // sum of y
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60 double sigxx; // sum x squared
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61 double sigxy; // sum of xy
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62 double sigyy; // sum y squared
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63 long double sigxxx; // sum x cubed
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64 long double sigxxy; // sum xsquared y
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65 long double sigxxxx; // sum x fourth
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66 };
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67
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68 } // namespace tesseract
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70 #endif