Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/ccstruct/quadratc.h @ 17:dd9cdb856310

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Remove PKG-INFO from the because it is regenerated automatically for the sdist
author Franz Glasner <fzglas.hg@dom66.de>
date Thu, 18 Sep 2025 17:40:40 +0200
parents b50eed0cc0ef
children
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1 /**********************************************************************
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2 * File: quadratc.h (Formerly quadrtic.h)
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3 * Description: Code for the QUAD_COEFFS class.
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4 * Author: Ray Smith
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5 * Created: Tue Oct 08 17:24:40 BST 1991
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6 *
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7 * (C) Copyright 1991, Hewlett-Packard Ltd.
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8 ** Licensed under the Apache License, Version 2.0 (the "License");
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9 ** you may not use this file except in compliance with the License.
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10 ** You may obtain a copy of the License at
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11 ** http://www.apache.org/licenses/LICENSE-2.0
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12 ** Unless required by applicable law or agreed to in writing, software
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13 ** distributed under the License is distributed on an "AS IS" BASIS,
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14 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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15 ** See the License for the specific language governing permissions and
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16 ** limitations under the License.
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17 *
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18 **********************************************************************/
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20 #ifndef QUADRATC_H
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21 #define QUADRATC_H
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23 #include "points.h"
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25 namespace tesseract {
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27 class QUAD_COEFFS {
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28 public:
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29 QUAD_COEFFS() = default;
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30 QUAD_COEFFS( // constructor
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31 double xsq, // coefficients
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32 float x, float constant) {
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33 a = xsq;
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34 b = x;
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35 c = constant;
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36 }
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38 float y( // evaluate
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39 float x) const { // at x
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40 return static_cast<float>((a * x + b) * x + c);
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41 }
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43 void move( // reposition word
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44 ICOORD vec) { // by vector
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45 /************************************************************
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46 y - q = a (x - p)^2 + b (x - p) + c
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47 y - q = ax^2 - 2apx + ap^2 + bx - bp + c
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48 y = ax^2 + (b - 2ap)x + (c - bp + ap^2 + q)
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49 ************************************************************/
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50 int16_t p = vec.x();
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51 int16_t q = vec.y();
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53 c = static_cast<float>(c - b * p + a * p * p + q);
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54 b = static_cast<float>(b - 2 * a * p);
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55 }
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57 double a; // x squared
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58 float b; // x
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59 float c; // constant
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60 private:
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61 };
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63 } // namespace tesseract
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65 #endif