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annotate libinterp/corefcn/__contourc__.cc @ 21966:112b20240c87

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move docstrings in C++ files out of C strings and into comments * __contourc__.cc, __dispatch__.cc, __dsearchn__.cc, __ichol__.cc, __ilu__.cc, __lin_interpn__.cc, __luinc__.cc, __magick_read__.cc, __pchip_deriv__.cc, __qp__.cc, balance.cc, besselj.cc, betainc.cc, bitfcns.cc, bsxfun.cc, cellfun.cc, colloc.cc, conv2.cc, daspk.cc, dasrt.cc, dassl.cc, data.cc, debug.cc, defaults.cc, det.cc, dirfns.cc, dlmread.cc, dot.cc, eig.cc, ellipj.cc, error.cc, fft.cc, fft2.cc, fftn.cc, file-io.cc, filter.cc, find.cc, gammainc.cc, gcd.cc, getgrent.cc, getpwent.cc, getrusage.cc, givens.cc, graphics.cc, hash.cc, help.cc, hess.cc, hex2num.cc, input.cc, inv.cc, kron.cc, load-path.cc, load-save.cc, lookup.cc, ls-oct-text.cc, lsode.cc, lu.cc, mappers.cc, matrix_type.cc, max.cc, mgorth.cc, nproc.cc, oct-hist.cc, octave-link.cc, ordschur.cc, pager.cc, pinv.cc, pr-output.cc, profiler.cc, psi.cc, pt-jit.cc, quad.cc, quadcc.cc, qz.cc, rand.cc, rcond.cc, regexp.cc, schur.cc, sighandlers.cc, sparse.cc, spparms.cc, sqrtm.cc, str2double.cc, strfind.cc, strfns.cc, sub2ind.cc, svd.cc, sylvester.cc, symtab.cc, syscalls.cc, sysdep.cc, time.cc, toplev.cc, tril.cc, tsearch.cc, typecast.cc, urlwrite.cc, utils.cc, variables.cc, __delaunayn__.cc, __eigs__.cc, __fltk_uigetfile__.cc, __glpk__.cc, __init_fltk__.cc, __init_gnuplot__.cc, __osmesa_print__.cc, __voronoi__.cc, amd.cc, audiodevinfo.cc, audioread.cc, ccolamd.cc, chol.cc, colamd.cc, convhulln.cc, dmperm.cc, fftw.cc, qr.cc, symbfact.cc, symrcm.cc, ov-base.cc, ov-bool-mat.cc, ov-cell.cc, ov-class.cc, ov-classdef.cc, ov-fcn-handle.cc, ov-fcn-inline.cc, ov-flt-re-mat.cc, ov-int16.cc, ov-int32.cc, ov-int64.cc, ov-int8.cc, ov-java.cc, ov-null-mat.cc, ov-oncleanup.cc, ov-range.cc, ov-re-mat.cc, ov-struct.cc, ov-typeinfo.cc, ov-uint16.cc, ov-uint32.cc, ov-uint64.cc, ov-uint8.cc, ov-usr-fcn.cc, ov.cc, octave.cc, pt-arg-list.cc, pt-binop.cc, pt-eval.cc, pt-mat.cc, lex.ll, oct-parse.in.yy: Docstrings are now comments instead of C strings. * build-aux/mk-opts.pl: Emit docstrings as comments instead of C strings. * DASPK-opts.in, LSODE-opts.in: Don't quote " in docstring fragments. * builtins.h: Include builtin-defun-decls.h unconditionally. * defun.h (DEFUN, DEFUNX, DEFCONSTFUN): Simply emit declaration. (DEFALIAS): Always expand to nothing. * defun-dld.h: No special macro expansions for MAKE_BUILTINS. (DEFUN_DLD): Use FORWARD_DECLARE_FUN. (DEFUNX_DLD): Use FORWARD_DECLARE_FUNX. * defun-int.h: No special macro expansions for MAKE_BUILTINS. (FORWARD_DECLARE_FUN, FORWARD_DECLARE_FUNX): New macros. (DEFINE_FUN_INSTALLER_FUN): If compiling an Octave source file, pass "external-doc" to DEFINE_FUNX_INSTALLER_FUN. (DEFUN_INTERNAL, DEFCONSTFUN_INTERNAL, DEFUNX_INTERNAL, DEFALIAS_INTERNAL): Delete. * common.mk (move_if_change_rule): New macro. (simple_move_if_change_rule): Define using move_if_change_rule. * find-defun-files.sh (DEFUN_PATTERN): Update. Don't transform file name extension to ".df". * libinterp/mk-pkg-add, gendoc.pl: Operate directly on source files. * mkbuiltins: New argument, SRCDIR. Operate directly on source files. * mkdefs: Delete. * libinterp/module.mk (BUILT_SOURCES): Update list to contain only files included in other source files. (GENERATED_MAKE_BUILTINS_INCS, DEF_FILES): Delete. (LIBINTERP_BUILT_DISTFILES): Include $(OPT_HANDLERS) here. (LIBINTERP_BUILT_NODISTFILES): Not here. Remove $(ALL_DEF_FILES from the list. (libinterp_EXTRA_DIST): Remove mkdefs from the list. (FOUND_DEFUN_FILES): Rename from SRC_DEF_FILES. (DLDFCN_DEFUN_FILES): Rename from DLDFCN_DEF_FILES. (SRC_DEFUN_FILES): Rename from SRC_DEF_FILES. (ALL_DEFUN_FILES): Rename from ALL_DEF_FILES. (%.df: %.cc): Delete pattern rule. (libinterp/build-env-features.cc, libinterp/builtins.cc, libinterp/dldfcn/PKG_ADD): Use mv instead of move-if-change. (libinterp/builtins.cc, libinterp/builtin-defun-decls.h): Update mkbuiltins command. ($(srcdir)/libinterp/DOCSTRINGS): Update gendoc.pl command. * liboctave/module.mk (BUILT_SOURCES): Don't include liboctave-build-info.cc in the list.
author John W. Eaton <jwe@octave.org>
date Tue, 21 Jun 2016 16:07:51 -0400
parents 2aef506f3fec
children bac0d6f07a3e
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1 /* Contour lines for function evaluated on a grid.
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2
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3 Copyright (C) 2007-2015 Kai Habel
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4 Copyright (C) 2004, 2007 Shai Ayal
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5
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6 Adapted to an oct file from the stand alone contourl by Victro Munoz
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7 Copyright (C) 2004 Victor Munoz
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8
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9 Based on contour plot routine (plcont.c) in PLPlot package
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10 http://plplot.org/
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11
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12 Copyright (C) 1995, 2000, 2001 Maurice LeBrun
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13 Copyright (C) 2000, 2002 Joao Cardoso
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14 Copyright (C) 2000, 2001, 2002, 2004 Alan W. Irwin
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15 Copyright (C) 2004 Andrew Ross
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17 This file is part of Octave.
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18
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19 Octave is free software; you can redistribute it and/or modify it
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20 under the terms of the GNU General Public License as published by the
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21 Free Software Foundation; either version 3 of the License, or (at your
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22 option) any later version.
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23
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24 Octave is distributed in the hope that it will be useful, but WITHOUT
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25 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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26 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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27 for more details.
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28
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29 You should have received a copy of the GNU General Public License
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30 along with Octave; see the file COPYING. If not, see
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31 <http://www.gnu.org/licenses/>.
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32
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33 */
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34
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35 #if defined (HAVE_CONFIG_H)
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36 # include "config.h"
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37 #endif
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38
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39 #include <cfloat>
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40
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41 #include "quit.h"
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42
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43 #include "defun.h"
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44 #include "error.h"
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45 #include "ovl.h"
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46
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47 // FIXME: this looks like trouble...
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48 static Matrix this_contour;
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49 static Matrix contourc;
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50 static int elem;
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51
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52 // This is the quanta in which we increase this_contour.
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53 #define CONTOUR_QUANT 50
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54
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55 // Add a coordinate point (x,y) to this_contour.
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56
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57 static void
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58 add_point (double x, double y)
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59 {
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60 if (elem % CONTOUR_QUANT == 0)
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61 this_contour = this_contour.append (Matrix (2, CONTOUR_QUANT, 0));
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62
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63 this_contour (0, elem) = x;
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64 this_contour (1, elem) = y;
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65 elem++;
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66 }
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67
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68 // Add contents of current contour to contourc.
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69 // this_contour.cols () - 1;
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70
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71 static void
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72 end_contour (void)
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73 {
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74 if (elem > 2)
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75 {
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76 this_contour (1, 0) = elem - 1;
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77 contourc = contourc.append (this_contour.extract_n (0, 0, 2, elem));
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78 }
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79
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80 this_contour = Matrix ();
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81 elem = 0;
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82 }
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83
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84 // Start a new contour, and add contents of current one to contourc.
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85
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86 static void
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87 start_contour (double lvl, double x, double y)
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88 {
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89 end_contour ();
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90 this_contour.resize (2, 0);
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91 add_point (lvl, 0);
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92 add_point (x, y);
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93 }
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94
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95 static void
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96 drawcn (const RowVector& X, const RowVector& Y, const Matrix& Z,
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97 double lvl, int r, int c, double ct_x, double ct_y,
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98 unsigned int start_edge, bool first, charMatrix& mark)
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99 {
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100 double px[4], py[4], pz[4], tmp;
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101 unsigned int stop_edge, pt[2];
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102
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103 // Continue while next facet is not done yet.
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104 while (r >= 0 && c >= 0 && r < mark.rows () && c < mark.cols ()
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105 && mark(r, c) > 0)
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106 {
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107
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108 //get x, y, and z - lvl for current facet
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109 px[0] = px[3] = X(c);
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110 px[1] = px[2] = X(c+1);
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111
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112 py[0] = py[1] = Y(r);
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113 py[2] = py[3] = Y(r+1);
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114
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115 pz[3] = Z(r+1, c) - lvl;
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116 pz[2] = Z(r+1, c + 1) - lvl;
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117 pz[1] = Z(r, c+1) - lvl;
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118 pz[0] = Z(r, c) - lvl;
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119
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120 // Facet edge and point naming assignment.
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121 //
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122 // 0-----1 .-0-.
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123 // | | | |
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124 // | | 3 1
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125 // | | | |
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126 // 3-----2 .-2-.
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127
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128 // Get mark value of current facet.
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129 char id = static_cast<char> (mark(r, c));
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130
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131 // Check startedge s.
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132 if (start_edge == 255)
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133 {
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134 // Find start edge.
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135 for (unsigned int k = 0; k < 4; k++)
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136 if (static_cast<char> (1 << k) & id)
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137 start_edge = k;
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138 }
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139
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140 if (start_edge == 255)
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141 break;
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142
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143 // Decrease mark value of current facet for start edge.
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144 mark(r, c) -= static_cast<char> (1 << start_edge);
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145
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146 // Next point (clockwise).
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147 pt[0] = start_edge;
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148 pt[1] = (pt[0] + 1) % 4;
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149
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150 // Calculate contour segment start if first of contour.
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151 if (first)
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152 {
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153 tmp = fabs (pz[pt[1]]) / fabs (pz[pt[0]]);
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154
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155 if (octave::math::isnan (tmp))
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156 ct_x = ct_y = 0.5;
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157 else
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158 {
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159 ct_x = px[pt[0]] + (px[pt[1]] - px[pt[0]])/(1 + tmp);
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160 ct_y = py[pt[0]] + (py[pt[1]] - py[pt[0]])/(1 + tmp);
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161 }
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162
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163 start_contour (lvl, ct_x, ct_y);
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164 first = false;
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165 }
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166
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167 // Find stop edge.
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168 // FIXME: perhaps this should use a while loop?
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169 for (unsigned int k = 1; k <= 4; k++)
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170 {
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171 if (start_edge == 0 || start_edge == 2)
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172 stop_edge = (start_edge + k) % 4;
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173 else
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174 stop_edge = (start_edge - k) % 4;
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175
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176 if (static_cast<char> (1 << stop_edge) & id)
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177 break;
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178 }
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179
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180 pt[0] = stop_edge;
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181 pt[1] = (pt[0] + 1) % 4;
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182 tmp = fabs (pz[pt[1]]) / fabs (pz[pt[0]]);
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183
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184 if (octave::math::isnan (tmp))
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185 ct_x = ct_y = 0.5;
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186 else
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187 {
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188 ct_x = px[pt[0]] + (px[pt[1]] - px[pt[0]])/(1 + tmp);
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189 ct_y = py[pt[0]] + (py[pt[1]] - py[pt[0]])/(1 + tmp);
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190 }
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191
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192 // Add point to contour.
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193 add_point (ct_x, ct_y);
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194
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195 // Decrease id value of current facet for start edge.
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196 mark(r, c) -= static_cast<char> (1 << stop_edge);
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197
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198 // Find next facet.
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199 if (stop_edge == 0)
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200 r--;
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201 else if (stop_edge == 1)
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202 c++;
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203 else if (stop_edge == 2)
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204 r++;
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205 else if (stop_edge == 3)
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206 c--;
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207
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208 // Go to next facet.
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209 start_edge = (stop_edge + 2) % 4;
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210
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211 }
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212 }
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213
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214 static void
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215 mark_facets (const Matrix& Z, charMatrix& mark, double lvl)
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216 {
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217 unsigned int nr = mark.rows ();
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218 unsigned int nc = mark.cols ();
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219
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220 double f[4];
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221
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222 for (unsigned int c = 0; c < nc; c++)
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223 for (unsigned int r = 0; r < nr; r++)
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224 {
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225 f[0] = Z(r, c) - lvl;
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226 f[1] = Z(r, c+1) - lvl;
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227 f[3] = Z(r+1, c) - lvl;
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228 f[2] = Z(r+1, c+1) - lvl;
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229
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230 for (unsigned int i = 0; i < 4; i++)
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231 if (fabs(f[i]) < std::numeric_limits<double>::epsilon ())
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232 f[i] = std::numeric_limits<double>::epsilon ();
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233
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234 if (f[1] * f[2] < 0)
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235 mark(r, c) += 2;
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236
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237 if (f[0] * f[3] < 0)
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238 mark(r, c) += 8;
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239 }
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240
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241 for (unsigned int r = 0; r < nr; r++)
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242 for (unsigned int c = 0; c < nc; c++)
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243 {
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244 f[0] = Z(r, c) - lvl;
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245 f[1] = Z(r, c+1) - lvl;
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246 f[3] = Z(r+1, c) - lvl;
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247 f[2] = Z(r+1, c+1) - lvl;
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248
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249 for (unsigned int i = 0; i < 4; i++)
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250 if (fabs(f[i]) < std::numeric_limits<double>::epsilon ())
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251 f[i] = std::numeric_limits<double>::epsilon ();
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252
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253 if (f[0] * f[1] < 0)
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254 mark(r, c) += 1;
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255
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256 if (f[2] * f[3] < 0)
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257 mark(r, c) += 4;
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258 }
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259 }
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260
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261 static void
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262 cntr (const RowVector& X, const RowVector& Y, const Matrix& Z, double lvl)
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263 {
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264 unsigned int nr = Z.rows ();
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265 unsigned int nc = Z.cols ();
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266
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267 charMatrix mark (nr - 1, nc - 1, 0);
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268
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269 mark_facets (Z, mark, lvl);
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270
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271 // Find contours that start at a domain edge.
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272
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273 for (unsigned int c = 0; c < nc - 1; c++)
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274 {
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275 // Top.
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276 if (mark(0, c) & 1)
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277 drawcn (X, Y, Z, lvl, 0, c, 0.0, 0.0, 0, true, mark);
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278
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279 // Bottom.
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280 if (mark(nr - 2, c) & 4)
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281 drawcn (X, Y, Z, lvl, nr - 2, c, 0.0, 0.0, 2, true, mark);
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282 }
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283
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284 for (unsigned int r = 0; r < nr - 1; r++)
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285 {
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286 // Left.
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287 if (mark(r, 0) & 8)
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288 drawcn (X, Y, Z, lvl, r, 0, 0.0, 0.0, 3, true, mark);
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289
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290 // Right.
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291 if (mark(r, nc - 2) & 2)
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292 drawcn (X, Y, Z, lvl, r, nc - 2, 0.0, 0.0, 1, true, mark);
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293 }
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294
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295 for (unsigned int r = 0; r < nr - 1; r++)
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296 for (unsigned int c = 0; c < nc - 1; c++)
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297 if (mark (r, c) > 0)
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298 drawcn (X, Y, Z, lvl, r, c, 0.0, 0.0, 255, true, mark);
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299 }
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300
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301 DEFUN (__contourc__, args, ,
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302 doc: /* -*- texinfo -*-
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303 @deftypefn {} {} __contourc__ (@var{x}, @var{y}, @var{z}, @var{levels})
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304 Undocumented internal function.
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305 @end deftypefn */)
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306 {
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307 if (args.length () != 4)
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308 print_usage ();
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309
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310 RowVector X = args(0).row_vector_value ();
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311 RowVector Y = args(1).row_vector_value ();
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312 Matrix Z = args(2).matrix_value ();
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313 RowVector L = args(3).row_vector_value ();
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314
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315 contourc.resize (2, 0);
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316
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317 for (int i = 0; i < L.numel (); i++)
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318 cntr (X, Y, Z, L (i));
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319
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320 end_contour ();
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321
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322 return octave_value (contourc);
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323 }
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324
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325 /*
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326 ## No test needed for internal helper function.
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327 %!assert (1)
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328 */