388 lines
11 KiB
C++
388 lines
11 KiB
C++
/*
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* This file is part of RawTherapee.
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*
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* Copyright (c) 2004-2010 Gabor Horvath <hgabor@rawtherapee.com>
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*
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* RawTherapee is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* RawTherapee is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with RawTherapee. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <glib.h>
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#include <glib/gstdio.h>
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#include "curves.h"
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#include <cmath>
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#include <vector>
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#include "mytime.h"
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#include <cstring>
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#define CLIPD(a) ((a)>0.0?((a)<1.0?(a):1.0):0.0)
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namespace rtengine
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{
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DiagonalCurve::DiagonalCurve (const std::vector<double>& p, int poly_pn)
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{
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ppn = poly_pn > 65500 ? 65500 : poly_pn;
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bool identity = true;
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if (ppn < 500) {
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hashSize = 100; // Arbitrary cut-off value, but mutliple of 10
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}
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if (ppn < 50) {
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hashSize = 10; // Arbitrary cut-off value, but mutliple of 10
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}
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if (p.size() < 3) {
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kind = DCT_Empty;
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} else {
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kind = (DiagonalCurveType)p[0];
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if (kind == DCT_Linear || kind == DCT_Spline || kind == DCT_NURBS) {
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N = (p.size() - 1) / 2;
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x = new double[N];
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y = new double[N];
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int ix = 1;
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for (int i = 0; i < N; i++) {
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x[i] = p[ix++];
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y[i] = p[ix++];
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if (x[i] != y[i]) {
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identity = false;
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}
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}
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if (x[0] != 0.0f || x[N - 1] != 1.0f)
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// Special (and very rare) case where all points are on the identity line but
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// not reaching the limits
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{
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identity = false;
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}
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if(x[0] == 0.f && x[1] == 0.f)
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// Avoid crash when first two points are at x = 0 (git Issue 2888)
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x[1] = 0.01f;
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if(x[0] == 1.f && x[1] == 1.f)
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// Avoid crash when first two points are at x = 1 (100 in gui) (git Issue 2923)
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x[0] = 0.99f;
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if (!identity) {
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if (kind == DCT_Spline && N > 2) {
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spline_cubic_set ();
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} else if (kind == DCT_NURBS && N > 2) {
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NURBS_set ();
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fillHash();
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} else {
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kind = DCT_Linear;
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}
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}
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} else if (kind == DCT_Parametric) {
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if ((p.size() == 8 || p.size() == 9) && (p.at(4) != 0.0f || p.at(5) != 0.0f || p.at(6) != 0.0f || p.at(7) != 0.0f)) {
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identity = false;
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x = new double[9];
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x[0] = p[0];
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for (int i = 1; i < 4; i++) {
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x[i] = min(max(p[i], 0.001), 0.99);
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}
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for (int i = 4; i < 8; i++) {
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x[i] = (p[i] + 100.0) / 200.0;
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}
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if (p.size() < 9) {
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x[8] = 1.0;
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} else {
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x[8] = p[8] / 100.0;
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}
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mc = -xlog(2.0) / xlog(x[2]);
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double mbase = pfull (0.5, x[8], x[6], x[5]);
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mfc = mbase <= 1e-14 ? 0.0 : xexp(xlog(mbase) / mc); // value of the curve at the center point
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msc = -xlog(2.0) / xlog(x[1] / x[2]);
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mhc = -xlog(2.0) / xlog((x[3] - x[2]) / (1 - x[2]));
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}
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}
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if (identity) {
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kind = DCT_Empty;
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}
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}
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}
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DiagonalCurve::~DiagonalCurve ()
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{
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delete [] x;
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delete [] y;
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delete [] ypp;
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poly_x.clear();
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poly_y.clear();
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}
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void DiagonalCurve::spline_cubic_set ()
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{
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double* u = new double[N - 1];
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delete [] ypp; // TODO: why do we delete ypp here since it should not be allocated yet?
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ypp = new double [N];
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ypp[0] = u[0] = 0.0; /* set lower boundary condition to "natural" */
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for (int i = 1; i < N - 1; ++i) {
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double sig = (x[i] - x[i - 1]) / (x[i + 1] - x[i - 1]);
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double p = sig * ypp[i - 1] + 2.0;
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ypp[i] = (sig - 1.0) / p;
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u[i] = ((y[i + 1] - y[i])
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/ (x[i + 1] - x[i]) - (y[i] - y[i - 1]) / (x[i] - x[i - 1]));
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u[i] = (6.0 * u[i] / (x[i + 1] - x[i - 1]) - sig * u[i - 1]) / p;
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}
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ypp[N - 1] = 0.0;
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for (int k = N - 2; k >= 0; --k) {
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ypp[k] = ypp[k] * ypp[k + 1] + u[k];
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}
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delete [] u;
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}
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void DiagonalCurve::NURBS_set ()
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{
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int nbSubCurvesPoints = N + (N - 3) * 2;
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std::vector<double> sc_x(nbSubCurvesPoints); // X sub-curve points ( XP0,XP1,XP2, XP2,XP3,XP4, ...)
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std::vector<double> sc_y(nbSubCurvesPoints); // Y sub-curve points ( YP0,YP1,YP2, YP2,YP3,YP4, ...)
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std::vector<double> sc_length(N + 2); // Length of the subcurves
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double total_length = 0.;
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// Create the list of Bezier sub-curves
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// NURBS_set is called if N > 2 and non identity only
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int j = 0;
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int k = 0;
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for (int i = 0; i < N - 1;) {
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double length;
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double dx;
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double dy;
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// first point (on the curve)
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if (!i) {
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sc_x[j] = x[i];
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sc_y[j++] = y[i++];
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} else {
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sc_x[j] = (x[i - 1] + x[i]) / 2.;
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sc_y[j++] = (y[i - 1] + y[i]) / 2.;
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}
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// second point (control point)
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sc_x[j] = x[i];
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sc_y[j] = y[i++];
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dx = sc_x[j] - sc_x[j - 1];
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dy = sc_y[j] - sc_y[j - 1];
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length = sqrt(dx * dx + dy * dy);
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j++;
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// third point (on the curve)
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if (i == N - 1) {
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sc_x[j] = x[i];
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sc_y[j] = y[i];
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} else {
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sc_x[j] = (x[i - 1] + x[i]) / 2.;
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sc_y[j] = (y[i - 1] + y[i]) / 2.;
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}
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dx = sc_x[j] - sc_x[j - 1];
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dy = sc_y[j] - sc_y[j - 1];
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length += sqrt(dx * dx + dy * dy);
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j++;
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// Storing the length of all sub-curves and the total length (to have a better distribution
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// of the points along the curve)
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sc_length[k++] = length;
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total_length += length;
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}
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poly_x.clear();
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poly_y.clear();
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unsigned int sc_xsize = j - 1;
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j = 0;
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// adding the initial horizontal segment, if any
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if (x[0] > 0.) {
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poly_x.push_back(0.);
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poly_y.push_back(y[0]);
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}
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// adding the initial horizontal segment, if any
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// create the polyline with the number of points adapted to the X range of the sub-curve
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for (unsigned int i = 0; i < sc_xsize /*sc_x.size()*/; i += 3) {
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// TODO: Speeding-up the interface by caching the polyline, instead of rebuilding it at each action on sliders !!!
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nbr_points = (int)(((double)(ppn + N - 2) * sc_length[i / 3] ) / total_length);
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if (nbr_points < 0) {
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for(size_t it = 0; it < sc_x.size(); it += 3) {
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printf("sc_length[%zu/3]=%f \n", it, sc_length[it / 3]);
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}
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printf("NURBS diagonal curve: error detected!\n i=%d nbr_points=%d ppn=%d N=%d sc_length[i/3]=%f total_length=%f", i, nbr_points, ppn, N, sc_length[i / 3], total_length);
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exit(0);
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}
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// increment along the curve, not along the X axis
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increment = 1.0 / (double)(nbr_points - 1);
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x1 = sc_x[i];
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y1 = sc_y[i];
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x2 = sc_x[i + 1];
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y2 = sc_y[i + 1];
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x3 = sc_x[i + 2];
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y3 = sc_y[i + 2];
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firstPointIncluded = !i;
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AddPolygons ();
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}
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// adding the final horizontal segment, always (see under)
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poly_x.push_back(3.0); // 3.0 is a hack for optimization purpose of the getVal method (the last value has to be beyond the normal range)
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poly_y.push_back(y[N - 1]);
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}
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double DiagonalCurve::getVal (double t) const
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{
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switch (kind) {
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case DCT_Parametric : {
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if (t <= 1e-14) {
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return 0.0;
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}
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double tv = xexp(mc * xlog(t));
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double base = pfull (tv, x[8], x[6], x[5]);
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double stretched = base <= 1e-14 ? 0.0 : xexp(xlog(base) / mc);
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if (t < x[2]) {
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// add shadows effect:
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double stv = xexp(msc * xlog(stretched / mfc));
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double sbase = pfull (stv, x[8], x[7], 0.5);
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return mfc * (sbase <= 1e-14 ? 0.0 : xexp(xlog(sbase) / msc));
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} else {
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// add highlights effect:
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double htv = xexp(mhc * xlog((stretched - mfc) / (1 - mfc)));
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double hbase = pfull (htv, x[8], 0.5, x[4]);
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return mfc + (1 - mfc) * (hbase <= 1e-14 ? 0.0 : xexp(xlog(hbase) / mhc));
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}
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break;
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}
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case DCT_Linear :
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case DCT_Spline : {
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// values under and over the first and last point
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if (t > x[N - 1]) {
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return y[N - 1];
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} else if (t < x[0]) {
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return y[0];
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}
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// do a binary search for the right interval:
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unsigned int k_lo = 0, k_hi = N - 1;
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while (k_hi - k_lo > 1) {
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unsigned int k = (k_hi + k_lo) / 2;
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if (x[k] > t) {
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k_hi = k;
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} else {
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k_lo = k;
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}
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}
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double h = x[k_hi] - x[k_lo];
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// linear
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if (kind == DCT_Linear) {
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return y[k_lo] + (t - x[k_lo]) * ( y[k_hi] - y[k_lo] ) / h;
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}
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// spline curve
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else { // if (kind==Spline) {
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double a = (x[k_hi] - t) / h;
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double b = (t - x[k_lo]) / h;
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double r = a * y[k_lo] + b * y[k_hi] + ((a * a * a - a) * ypp[k_lo] + (b * b * b - b) * ypp[k_hi]) * (h * h) * 0.1666666666666666666666666666666;
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return CLIPD(r);
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}
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break;
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}
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case DCT_NURBS : {
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// get the hash table entry by rounding the value (previously multiplied by "hashSize")
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unsigned short int i = (unsigned short int)(t * hashSize);
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if (i > (hashSize + 1)) {
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//printf("\nOVERFLOW: hash #%d is used while seeking for value %.8f, corresponding polygon's point #%d (out of %d point) x value: %.8f\n\n", i, t, hash.at(i), poly_x.size(), poly_x[hash.at(i)]);
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printf("\nOVERFLOW: hash #%d is used while seeking for value %.8f\n\n", i, t);
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return t;
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}
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unsigned int k_lo;
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unsigned int k_hi;
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k_lo = hash.at(i).smallerValue;
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k_hi = hash.at(i).higherValue;
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// do a binary search for the right interval :
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while (k_hi - k_lo > 1) {
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unsigned int k = (k_hi + k_lo) / 2;
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if (poly_x[k] > t) {
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k_hi = k;
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} else {
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k_lo = k;
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}
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}
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if (k_lo == k_hi) {
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k_hi = k_lo + 1;
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}
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double dx = poly_x[k_hi] - poly_x[k_lo];
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double dy = poly_y[k_hi] - poly_y[k_lo];
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return poly_y[k_lo] + (t - poly_x[k_lo]) * ( dy ) / dx;
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break;
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}
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case DCT_Empty :
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default:
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// all other (unknown) kind
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return t;
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}
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}
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void DiagonalCurve::getVal (const std::vector<double>& t, std::vector<double>& res) const
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{
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res.resize (t.size());
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for (unsigned int i = 0; i < t.size(); i++) {
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res[i] = getVal(t[i]);
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}
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}
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}
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