Changeset 338 for trunk/SRC/Documentation/idldoc_assistant_output/ToBeReviewed/TRIANGULATION/definetri.html
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- 03/20/08 23:06:02 (16 years ago)
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trunk/SRC/Documentation/idldoc_assistant_output/ToBeReviewed/TRIANGULATION/definetri.html
r321 r338 62 62 63 63 64 Define a triangulation array like <a href="/Applications/rsi/idl_6.3/help/online_help/TRIANGULATE.html">TRIANGULATE</a>. 65 But in a VERY SIMPLE CASE: 64 Define a triangulation array like <a href="/Applications/itt/idl64/help/online_help/TRIANGULATE.html">TRIANGULATE</a>. 65 66 But in a VERY SIMPLE CASE: 66 67 the points are regularly-gridded on nx*ny array. 67 68 Find a Delaunay triangulation for this set of points is easy: 68 69 Points define (nx-1)*(ny-1) rectangles which we can cut in 2 triangles. 70 69 71 cf. figure above 70 72 71 73 <pre> 72 fixe73 74 ny-1*---*---*. . . . . .*---*---* 74 75 | +| +| | +| +| … … 169 170 170 171 171 When DOWNWARDis undefined all rectangles are cut in using the upward172 When downward is undefined all rectangles are cut in using the upward 172 173 diagonal. 173 DOWNWARDis a vector which contains the rectangles numbers which are cut in174 downward is a vector which contains the rectangles numbers which are cut in 174 175 using the downward diagonal. 175 176 The rectangle number is defined by the index (in a nx*ny vector) of the … … 184 185 185 186 IDL> triangles=definetri(3,3,[1,3]) 187 186 188 triangles will be this kind of triangulation: 187 189 190 <pre> 188 191 *---*---* 189 192 |+ | +| … … 196 199 *---*---* 197 200 201 <pre> 198 202 199 203 </pre><h3>Version history</h3> 200 204 201 205 <h4>Version</h4> 202 $Id: definetri.pro 297 2007-09-25 15:09:12Z pinsard $206 $Id: definetri.pro 325 2007-12-06 10:04:53Z pinsard $ 203 207 <h4>History</h4> 204 208 sebastien Masson (smlod@ipsl.jussieu.fr)
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