/usr/include/tesseract/quspline.h is in libtesseract-dev 3.02.01-2.
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* 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 "quadratc.h"
#include "serialis.h"
#include "memry.h"
#include "rect.h"
class ROW;
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 = NULL; //everything empty
quadratics = NULL;
}
QSPLINE( //copy constructor
const QSPLINE &src);
QSPLINE( //constructor
inT32 count, //number of segments
inT32 *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
BOOL8 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
QSPLINE & operator= (
const QSPLINE & source); //from this
private:
inT32 spline_index( //binary search
double x) const; //for x
inT32 segments; //no of segments
inT32 *xcoords; //no of coords
QUAD_COEFFS *quadratics; //spline pieces
};
#endif
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