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 <span id="projectnumber">3.03</span>
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<div class="title">/usr/local/google/home/jbreiden/tesseract-ocr-read-only/ccstruct/points.cpp</div> </div>
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<div class="contents">
103
<a href="a00774.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/**********************************************************************</span>
104
<a name="l00002"></a>00002 <span class="comment"> * File: points.c (Formerly coords.c)</span>
105
<a name="l00003"></a>00003 <span class="comment"> * Description: Member functions for coordinate classes.</span>
106
<a name="l00004"></a>00004 <span class="comment"> * Author: Ray Smith</span>
107
<a name="l00005"></a>00005 <span class="comment"> * Created: Fri Mar 15 08:58:17 GMT 1991</span>
108
<a name="l00006"></a>00006 <span class="comment"> *</span>
109
<a name="l00007"></a>00007 <span class="comment"> * (C) Copyright 1991, Hewlett-Packard Ltd.</span>
110
<a name="l00008"></a>00008 <span class="comment"> ** Licensed under the Apache License, Version 2.0 (the "License");</span>
111
<a name="l00009"></a>00009 <span class="comment"> ** you may not use this file except in compliance with the License.</span>
112
<a name="l00010"></a>00010 <span class="comment"> ** You may obtain a copy of the License at</span>
113
<a name="l00011"></a>00011 <span class="comment"> ** http://www.apache.org/licenses/LICENSE-2.0</span>
114
<a name="l00012"></a>00012 <span class="comment"> ** Unless required by applicable law or agreed to in writing, software</span>
115
<a name="l00013"></a>00013 <span class="comment"> ** distributed under the License is distributed on an "AS IS" BASIS,</span>
116
<a name="l00014"></a>00014 <span class="comment"> ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span>
117
<a name="l00015"></a>00015 <span class="comment"> ** See the License for the specific language governing permissions and</span>
118
<a name="l00016"></a>00016 <span class="comment"> ** limitations under the License.</span>
119
<a name="l00017"></a>00017 <span class="comment"> *</span>
120
<a name="l00018"></a>00018 <span class="comment"> **********************************************************************/</span>
121
<a name="l00019"></a>00019
122
<a name="l00020"></a>00020 <span class="preprocessor">#ifdef _MSC_VER</span>
123
<a name="l00021"></a>00021 <span class="preprocessor"></span><span class="preprocessor">#define _USE_MATH_DEFINES</span>
124
<a name="l00022"></a>00022 <span class="preprocessor"></span><span class="preprocessor">#endif // _MSC_VER</span>
125
<a name="l00023"></a>00023 <span class="preprocessor"></span>
126
<a name="l00024"></a>00024 <span class="preprocessor">#include <stdlib.h></span>
127
<a name="l00025"></a>00025 <span class="preprocessor">#include "<a class="code" href="a00830.html">helpers.h</a>"</span>
128
<a name="l00026"></a>00026 <span class="preprocessor">#include "<a class="code" href="a00839.html">ndminx.h</a>"</span>
129
<a name="l00027"></a>00027 <span class="preprocessor">#include "<a class="code" href="a00851.html">serialis.h</a>"</span>
130
<a name="l00028"></a>00028 <span class="preprocessor">#include "<a class="code" href="a00775.html">points.h</a>"</span>
131
<a name="l00029"></a>00029
132
<a name="l00030"></a><a class="code" href="a00774.html#a53f643f86d802fc4b65b8cbb73f21622">00030</a> <a class="code" href="a00819.html#ab54325a3cfcd9bee58697d77e1902240">ELISTIZE</a> (<a class="code" href="a00410.html">ICOORDELT</a>) <span class="comment">//turn to list</span>
133
<a name="l00031"></a>00031 bool <a class="code" href="a00375.html">FCOORD</a>::normalise() { <span class="comment">//Convert to unit vec</span>
134
<a name="l00032"></a>00032 <span class="keywordtype">float</span> len = length ();
135
<a name="l00033"></a>00033
136
<a name="l00034"></a>00034 <span class="keywordflow">if</span> (len < 0.0000000001) {
137
<a name="l00035"></a>00035 <span class="keywordflow">return</span> <span class="keyword">false</span>;
138
<a name="l00036"></a>00036 }
139
<a name="l00037"></a>00037 xcoord /= len;
140
<a name="l00038"></a>00038 ycoord /= len;
141
<a name="l00039"></a>00039 <span class="keywordflow">return</span> <span class="keyword">true</span>;
142
<a name="l00040"></a>00040 }
143
<a name="l00041"></a>00041
144
<a name="l00042"></a>00042 <span class="comment">// Set from the given x,y, shrinking the vector to fit if needed.</span>
145
<a name="l00043"></a><a class="code" href="a00409.html#a202dcd2920b28d85c2338d28dac8c5fe">00043</a> <span class="keywordtype">void</span> <a class="code" href="a00409.html#a202dcd2920b28d85c2338d28dac8c5fe" title="Set from the given x,y, shrinking the vector to fit if needed.">ICOORD::set_with_shrink</a>(<span class="keywordtype">int</span> x, <span class="keywordtype">int</span> y) {
146
<a name="l00044"></a>00044 <span class="comment">// Fit the vector into an ICOORD, which is 16 bit.</span>
147
<a name="l00045"></a>00045 <span class="keywordtype">int</span> factor = 1;
148
<a name="l00046"></a>00046 <span class="keywordtype">int</span> max_extent = MAX(abs(x), abs(y));
149
<a name="l00047"></a>00047 <span class="keywordflow">if</span> (max_extent > <a class="code" href="a00831.html#a3905e54374e49708219791e7d59c60fb">MAX_INT16</a>)
150
<a name="l00048"></a>00048 factor = max_extent / <a class="code" href="a00831.html#a3905e54374e49708219791e7d59c60fb">MAX_INT16</a> + 1;
151
<a name="l00049"></a>00049 <a class="code" href="a00409.html#a0bba3892d33e49115748480b986fdae8">xcoord</a> = x / factor;
152
<a name="l00050"></a>00050 <a class="code" href="a00409.html#a80ea51273376c5a171c6d0dcb5193b12">ycoord</a> = y / factor;
153
<a name="l00051"></a>00051 }
154
<a name="l00052"></a>00052
155
<a name="l00053"></a>00053 <span class="comment">// The fortran/basic sgn function returns -1, 0, 1 if x < 0, x == 0, x > 0</span>
156
<a name="l00054"></a>00054 <span class="comment">// respectively.</span>
157
<a name="l00055"></a>00055 <span class="keyword">static</span> <span class="keywordtype">int</span> sign(<span class="keywordtype">int</span> x) {
158
<a name="l00056"></a>00056 <span class="keywordflow">if</span> (x < 0)
159
<a name="l00057"></a>00057 <span class="keywordflow">return</span> -1;
160
<a name="l00058"></a>00058 <span class="keywordflow">else</span>
161
<a name="l00059"></a>00059 <span class="keywordflow">return</span> x > 0 ? 1 : 0;
162
<a name="l00060"></a>00060 }
163
<a name="l00061"></a>00061
164
<a name="l00062"></a>00062 <span class="comment">// Writes to the given file. Returns false in case of error.</span>
165
<a name="l00063"></a><a class="code" href="a00409.html#a3159371d913e1b05860ae0c274fda0f6">00063</a> <span class="keywordtype">bool</span> <a class="code" href="a00409.html#a3159371d913e1b05860ae0c274fda0f6">ICOORD::Serialize</a>(FILE* fp)<span class="keyword"> const </span>{
166
<a name="l00064"></a>00064 <span class="keywordflow">if</span> (fwrite(&<a class="code" href="a00409.html#a0bba3892d33e49115748480b986fdae8">xcoord</a>, <span class="keyword">sizeof</span>(<a class="code" href="a00409.html#a0bba3892d33e49115748480b986fdae8">xcoord</a>), 1, fp) != 1) <span class="keywordflow">return</span> <span class="keyword">false</span>;
167
<a name="l00065"></a>00065 <span class="keywordflow">if</span> (fwrite(&<a class="code" href="a00409.html#a80ea51273376c5a171c6d0dcb5193b12">ycoord</a>, <span class="keyword">sizeof</span>(<a class="code" href="a00409.html#a80ea51273376c5a171c6d0dcb5193b12">ycoord</a>), 1, fp) != 1) <span class="keywordflow">return</span> <span class="keyword">false</span>;
168
<a name="l00066"></a>00066 <span class="keywordflow">return</span> <span class="keyword">true</span>;
169
<a name="l00067"></a>00067 }
170
<a name="l00068"></a>00068 <span class="comment">// Reads from the given file. Returns false in case of error.</span>
171
<a name="l00069"></a>00069 <span class="comment">// If swap is true, assumes a big/little-endian swap is needed.</span>
172
<a name="l00070"></a><a class="code" href="a00409.html#ae73dd714e26ceef74c3d1b552693c5a4">00070</a> <span class="keywordtype">bool</span> <a class="code" href="a00409.html#ae73dd714e26ceef74c3d1b552693c5a4">ICOORD::DeSerialize</a>(<span class="keywordtype">bool</span> swap, FILE* fp) {
173
<a name="l00071"></a>00071 <span class="keywordflow">if</span> (fread(&<a class="code" href="a00409.html#a0bba3892d33e49115748480b986fdae8">xcoord</a>, <span class="keyword">sizeof</span>(<a class="code" href="a00409.html#a0bba3892d33e49115748480b986fdae8">xcoord</a>), 1, fp) != 1) <span class="keywordflow">return</span> <span class="keyword">false</span>;
174
<a name="l00072"></a>00072 <span class="keywordflow">if</span> (fread(&<a class="code" href="a00409.html#a80ea51273376c5a171c6d0dcb5193b12">ycoord</a>, <span class="keyword">sizeof</span>(<a class="code" href="a00409.html#a80ea51273376c5a171c6d0dcb5193b12">ycoord</a>), 1, fp) != 1) <span class="keywordflow">return</span> <span class="keyword">false</span>;
175
<a name="l00073"></a>00073 <span class="keywordflow">if</span> (swap) {
176
<a name="l00074"></a>00074 <a class="code" href="a00830.html#ae7eeeca49954d4b13d269729f2fecd5a">ReverseN</a>(&<a class="code" href="a00409.html#a0bba3892d33e49115748480b986fdae8">xcoord</a>, <span class="keyword">sizeof</span>(<a class="code" href="a00409.html#a0bba3892d33e49115748480b986fdae8">xcoord</a>));
177
<a name="l00075"></a>00075 <a class="code" href="a00830.html#ae7eeeca49954d4b13d269729f2fecd5a">ReverseN</a>(&<a class="code" href="a00409.html#a80ea51273376c5a171c6d0dcb5193b12">ycoord</a>, <span class="keyword">sizeof</span>(<a class="code" href="a00409.html#a80ea51273376c5a171c6d0dcb5193b12">ycoord</a>));
178
<a name="l00076"></a>00076 }
179
<a name="l00077"></a>00077 <span class="keywordflow">return</span> <span class="keyword">true</span>;
180
<a name="l00078"></a>00078 }
181
<a name="l00079"></a>00079
182
<a name="l00080"></a>00080 <span class="comment">// Setup for iterating over the pixels in a vector by the well-known</span>
183
<a name="l00081"></a>00081 <span class="comment">// Bresenham rendering algorithm.</span>
184
<a name="l00082"></a>00082 <span class="comment">// Starting with major/2 in the accumulator, on each step add major_step,</span>
185
<a name="l00083"></a>00083 <span class="comment">// and then add minor to the accumulator. When the accumulator >= major</span>
186
<a name="l00084"></a>00084 <span class="comment">// subtract major and step a minor step.</span>
187
<a name="l00085"></a>00085
188
<a name="l00086"></a><a class="code" href="a00409.html#a5e71450225ed82a910bdec74a95a2c6d">00086</a> <span class="keywordtype">void</span> <a class="code" href="a00409.html#a5e71450225ed82a910bdec74a95a2c6d">ICOORD::setup_render</a>(<a class="code" href="a00409.html" title="integer coordinate">ICOORD</a>* major_step, <a class="code" href="a00409.html" title="integer coordinate">ICOORD</a>* minor_step,
189
<a name="l00087"></a>00087 <span class="keywordtype">int</span>* major, <span class="keywordtype">int</span>* minor)<span class="keyword"> const </span>{
190
<a name="l00088"></a>00088 <span class="keywordtype">int</span> abs_x = abs(<a class="code" href="a00409.html#a0bba3892d33e49115748480b986fdae8">xcoord</a>);
191
<a name="l00089"></a>00089 <span class="keywordtype">int</span> abs_y = abs(<a class="code" href="a00409.html#a80ea51273376c5a171c6d0dcb5193b12">ycoord</a>);
192
<a name="l00090"></a>00090 <span class="keywordflow">if</span> (abs_x >= abs_y) {
193
<a name="l00091"></a>00091 <span class="comment">// X-direction is major.</span>
194
<a name="l00092"></a>00092 major_step-><a class="code" href="a00409.html#a0bba3892d33e49115748480b986fdae8">xcoord</a> = sign(<a class="code" href="a00409.html#a0bba3892d33e49115748480b986fdae8">xcoord</a>);
195
<a name="l00093"></a>00093 major_step-><a class="code" href="a00409.html#a80ea51273376c5a171c6d0dcb5193b12">ycoord</a> = 0;
196
<a name="l00094"></a>00094 minor_step-><a class="code" href="a00409.html#a0bba3892d33e49115748480b986fdae8">xcoord</a> = 0;
197
<a name="l00095"></a>00095 minor_step-><a class="code" href="a00409.html#a80ea51273376c5a171c6d0dcb5193b12">ycoord</a> = sign(<a class="code" href="a00409.html#a80ea51273376c5a171c6d0dcb5193b12">ycoord</a>);
198
<a name="l00096"></a>00096 *major = abs_x;
199
<a name="l00097"></a>00097 *minor = abs_y;
200
<a name="l00098"></a>00098 } <span class="keywordflow">else</span> {
201
<a name="l00099"></a>00099 <span class="comment">// Y-direction is major.</span>
202
<a name="l00100"></a>00100 major_step-><a class="code" href="a00409.html#a0bba3892d33e49115748480b986fdae8">xcoord</a> = 0;
203
<a name="l00101"></a>00101 major_step-><a class="code" href="a00409.html#a80ea51273376c5a171c6d0dcb5193b12">ycoord</a> = sign(<a class="code" href="a00409.html#a80ea51273376c5a171c6d0dcb5193b12">ycoord</a>);
204
<a name="l00102"></a>00102 minor_step-><a class="code" href="a00409.html#a0bba3892d33e49115748480b986fdae8">xcoord</a> = sign(<a class="code" href="a00409.html#a0bba3892d33e49115748480b986fdae8">xcoord</a>);
205
<a name="l00103"></a>00103 minor_step-><a class="code" href="a00409.html#a80ea51273376c5a171c6d0dcb5193b12">ycoord</a> = 0;
206
<a name="l00104"></a>00104 *major = abs_y;
207
<a name="l00105"></a>00105 *minor = abs_x;
208
<a name="l00106"></a>00106 }
209
<a name="l00107"></a>00107 }
210
<a name="l00108"></a>00108
211
<a name="l00109"></a>00109 <span class="comment">// Returns the standard feature direction corresponding to this.</span>
212
<a name="l00110"></a>00110 <span class="comment">// See binary_angle_plus_pi below for a description of the direction.</span>
213
<a name="l00111"></a><a class="code" href="a00375.html#ac4a4eb3596ff292d3b16e40e26f563e5">00111</a> <a class="code" href="a00831.html#a458fe97f82495945f8071bb3c18d1783">uinT8</a> <a class="code" href="a00375.html#ac4a4eb3596ff292d3b16e40e26f563e5">FCOORD::to_direction</a>()<span class="keyword"> const </span>{
214
<a name="l00112"></a>00112 <span class="keywordflow">return</span> <a class="code" href="a00375.html#addbd98536b32aa4bbb2ca29ea462852a">binary_angle_plus_pi</a>(<a class="code" href="a00375.html#a4ab61cbf07eeb3473ae0ba6558fe9fb6" title="find angle">angle</a>());
215
<a name="l00113"></a>00113 }
216
<a name="l00114"></a>00114 <span class="comment">// Sets this with a unit vector in the given standard feature direction.</span>
217
<a name="l00115"></a><a class="code" href="a00375.html#ad8413eb2fb192a8de469b20a417adf38">00115</a> <span class="keywordtype">void</span> <a class="code" href="a00375.html#ad8413eb2fb192a8de469b20a417adf38">FCOORD::from_direction</a>(<a class="code" href="a00831.html#a458fe97f82495945f8071bb3c18d1783">uinT8</a> <a class="code" href="a00801.html#a57d4a186a22b01e2110793bc22a5d8f0">direction</a>) {
218
<a name="l00116"></a>00116 <span class="keywordtype">double</span> radians = <a class="code" href="a00375.html#a6b9decced3526bc5bc428d80ae0c6f2a">angle_from_direction</a>(direction);
219
<a name="l00117"></a>00117 xcoord = cos(radians);
220
<a name="l00118"></a>00118 ycoord = sin(radians);
221
<a name="l00119"></a>00119 }
222
<a name="l00120"></a>00120
223
<a name="l00121"></a>00121 <span class="comment">// Converts an angle in radians (from ICOORD::angle or FCOORD::angle) to a</span>
224
<a name="l00122"></a>00122 <span class="comment">// standard feature direction as an unsigned angle in 256ths of a circle</span>
225
<a name="l00123"></a>00123 <span class="comment">// measured anticlockwise from (-1, 0).</span>
226
<a name="l00124"></a><a class="code" href="a00375.html#addbd98536b32aa4bbb2ca29ea462852a">00124</a> <a class="code" href="a00831.html#a458fe97f82495945f8071bb3c18d1783">uinT8</a> <a class="code" href="a00375.html#addbd98536b32aa4bbb2ca29ea462852a">FCOORD::binary_angle_plus_pi</a>(<span class="keywordtype">double</span> radians) {
227
<a name="l00125"></a>00125 <span class="keywordflow">return</span> <a class="code" href="a00830.html#a560c3ba94fe224dd67b10bd4cb5a6886">Modulo</a>(<a class="code" href="a00830.html#ab60e4f82956a1f5fdb54d0d8303e95b7">IntCastRounded</a>((radians + M_PI) * 128.0 / M_PI), 256);
228
<a name="l00126"></a>00126 }
229
<a name="l00127"></a>00127 <span class="comment">// Inverse of binary_angle_plus_pi returns an angle in radians for the</span>
230
<a name="l00128"></a>00128 <span class="comment">// given standard feature direction.</span>
231
<a name="l00129"></a><a class="code" href="a00375.html#a6b9decced3526bc5bc428d80ae0c6f2a">00129</a> <span class="keywordtype">double</span> <a class="code" href="a00375.html#a6b9decced3526bc5bc428d80ae0c6f2a">FCOORD::angle_from_direction</a>(<a class="code" href="a00831.html#a458fe97f82495945f8071bb3c18d1783">uinT8</a> <a class="code" href="a00801.html#a57d4a186a22b01e2110793bc22a5d8f0">direction</a>) {
232
<a name="l00130"></a>00130 <span class="keywordflow">return</span> direction * M_PI / 128.0 - M_PI;
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<a name="l00131"></a>00131 }
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<a name="l00132"></a>00132
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<a name="l00133"></a>00133 <span class="comment">// Returns the point on the given line nearest to this, ie the point such</span>
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<a name="l00134"></a>00134 <span class="comment">// that the vector point->this is perpendicular to the line.</span>
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<a name="l00135"></a>00135 <span class="comment">// The line is defined as a line_point and a dir_vector for its direction.</span>
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<a name="l00136"></a><a class="code" href="a00375.html#a6c7437f5231e6b168b47467e801df4d4">00136</a> <a class="code" href="a00375.html">FCOORD</a> <a class="code" href="a00375.html#a6c7437f5231e6b168b47467e801df4d4">FCOORD::nearest_pt_on_line</a>(<span class="keyword">const</span> <a class="code" href="a00375.html">FCOORD</a>& line_point,
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<a name="l00137"></a>00137 <span class="keyword">const</span> <a class="code" href="a00375.html">FCOORD</a>& dir_vector)<span class="keyword"> const </span>{
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<a name="l00138"></a>00138 <a class="code" href="a00375.html">FCOORD</a> point_vector(*<span class="keyword">this</span> - line_point);
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<a name="l00139"></a>00139 <span class="comment">// The dot product (%) is |dir_vector||point_vector|cos theta, so dividing by</span>
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<a name="l00140"></a>00140 <span class="comment">// the square of the length of dir_vector gives us the fraction of dir_vector</span>
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<a name="l00141"></a>00141 <span class="comment">// to add to line1 to get the appropriate point, so</span>
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<a name="l00142"></a>00142 <span class="comment">// result = line1 + lambda dir_vector.</span>
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<a name="l00143"></a>00143 <span class="keywordtype">double</span> lambda = point_vector % dir_vector / dir_vector.<a class="code" href="a00375.html#a200f5a95100dd178551868e3ce242ef5" title="find sq length">sqlength</a>();
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<a name="l00144"></a>00144 <span class="keywordflow">return</span> line_point + (dir_vector * lambda);
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<a name="l00145"></a>00145 }
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<li class="navelem"><a class="el" href="a00774.html">points.cpp</a> </li>
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