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100 lines
3.6 KiB
C++
100 lines
3.6 KiB
C++
/**********************************************************************
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* File: quspline.h (Formerly qspline.h)
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* Description: Code for the QSPLINE class.
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* Author: Ray Smith
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* Created: Tue Oct 08 17:16:12 BST 1991
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*
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* (C) Copyright 1991, Hewlett-Packard Ltd.
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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** http://www.apache.org/licenses/LICENSE-2.0
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*
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**********************************************************************/
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#ifndef QUSPLINE_H
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#define QUSPLINE_H
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#include "quadratc.h"
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#include "serialis.h"
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#include "memry.h"
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#include "rect.h"
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class ROW;
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struct Pix;
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class QSPLINE
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{
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friend void make_first_baseline(TBOX *,
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int,
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int *,
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int *,
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QSPLINE *,
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QSPLINE *,
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float);
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friend void make_holed_baseline(TBOX *, int, QSPLINE *, QSPLINE *, float);
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friend void tweak_row_baseline(ROW *, double, double);
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public:
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QSPLINE() { //empty constructor
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segments = 0;
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xcoords = nullptr; //everything empty
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quadratics = nullptr;
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}
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QSPLINE( //copy constructor
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const QSPLINE &src);
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QSPLINE( //constructor
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int32_t count, //number of segments
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int32_t *xstarts, //segment starts
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double *coeffs); //coefficients
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~QSPLINE (); //destructor
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QSPLINE ( //least squares fit
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int xstarts[], //spline boundaries
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int segcount, //no of segments
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int xcoords[], //points to fit
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int ycoords[], int blobcount,//no of coords
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int degree); //function
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double step( //step change
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double x1, //between coords
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double x2);
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double y( //evaluate
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double x) const; //at x
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void move( // reposition spline
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ICOORD vec); // by vector
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BOOL8 overlap( //test overlap
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QSPLINE *spline2, //2 cannot be smaller
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double fraction); //by more than this
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void extrapolate( //linear extrapolation
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double gradient, //gradient to use
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int left, //new left edge
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int right); //new right edge
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#ifndef GRAPHICS_DISABLED
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void plot( //draw it
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ScrollView* window, //in window
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ScrollView::Color colour) const; //in colour
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#endif
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// Paint the baseline over pix. If pix has depth of 32, then the line will
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// be painted in red. Otherwise it will be painted in black.
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void plot(Pix* pix) const;
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QSPLINE & operator= (
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const QSPLINE & source); //from this
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private:
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int32_t spline_index( //binary search
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double x) const; //for x
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int32_t segments; //no of segments
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int32_t *xcoords; //no of coords
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QUAD_COEFFS *quadratics; //spline pieces
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};
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#endif
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