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Diffstat (limited to 'tesseract/src/ccstruct/quspline.h')
| -rw-r--r-- | tesseract/src/ccstruct/quspline.h | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/tesseract/src/ccstruct/quspline.h b/tesseract/src/ccstruct/quspline.h new file mode 100644 index 00000000..a170f4e0 --- /dev/null +++ b/tesseract/src/ccstruct/quspline.h @@ -0,0 +1,107 @@ +/********************************************************************** + * File: quspline.h (Formerly qspline.h) + * Description: Code for the QSPLINE class. + * Author: Ray Smith + * Created: Tue Oct 08 17:16:12 BST 1991 + * + * (C) Copyright 1991, Hewlett-Packard Ltd. + ** Licensed under the Apache License, Version 2.0 (the "License"); + ** you may not use this file except in compliance with the License. + ** You may obtain a copy of the License at + ** http://www.apache.org/licenses/LICENSE-2.0 + ** Unless required by applicable law or agreed to in writing, software + ** distributed under the License is distributed on an "AS IS" BASIS, + ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + ** See the License for the specific language governing permissions and + ** limitations under the License. + * + **********************************************************************/ + +#ifndef QUSPLINE_H +#define QUSPLINE_H + +#include "scrollview.h" // for ScrollView, ScrollView::Color + +#include <cstdint> // for int32_t + +struct Pix; + +namespace tesseract { + +class ICOORD; +class QUAD_COEFFS; +class ROW; +class TBOX; + +class QSPLINE +{ + friend void make_first_baseline(TBOX *, + int, + int *, + int *, + QSPLINE *, + QSPLINE *, + float); + friend void make_holed_baseline(TBOX *, int, QSPLINE *, QSPLINE *, float); + friend void tweak_row_baseline(ROW *, double, double); + public: + QSPLINE() { //empty constructor + segments = 0; + xcoords = nullptr; //everything empty + quadratics = nullptr; + } + QSPLINE( //copy constructor + const QSPLINE &src); + QSPLINE( //constructor + int32_t count, //number of segments + int32_t *xstarts, //segment starts + double *coeffs); //coefficients + ~QSPLINE (); //destructor + QSPLINE ( //least squares fit + int xstarts[], //spline boundaries + int segcount, //no of segments + int xcoords[], //points to fit + int ycoords[], int blobcount,//no of coords + int degree); //function + + double step( //step change + double x1, //between coords + double x2); + double y( //evaluate + double x) const; //at x + + void move( // reposition spline + ICOORD vec); // by vector + bool overlap( //test overlap + QSPLINE* spline2, //2 cannot be smaller + double fraction); //by more than this + void extrapolate( //linear extrapolation + double gradient, //gradient to use + int left, //new left edge + int right); //new right edge + +#ifndef GRAPHICS_DISABLED + void plot( //draw it + ScrollView* window, //in window + ScrollView::Color colour) const; //in colour +#endif + + // Paint the baseline over pix. If pix has depth of 32, then the line will + // be painted in red. Otherwise it will be painted in black. + void plot(Pix* pix) const; + + QSPLINE & operator= ( + const QSPLINE & source); //from this + + private: + + int32_t spline_index( //binary search + double x) const; //for x + int32_t segments; //no of segments + int32_t *xcoords; //no of coords + QUAD_COEFFS *quadratics; //spline pieces +}; + +} // namespace tesseract + +#endif |