1 | ;+ |
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2 | ; @file_comments |
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3 | ; |
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4 | ; |
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5 | ; @categories |
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6 | ; |
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7 | ; |
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8 | ; @param INDEX |
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9 | ; It is the tick mark index which starts at 0. |
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10 | ; |
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11 | ; @param NX {in}{required} |
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12 | ; The x dimension array |
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13 | ; |
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14 | ; @param NY {in}{required} |
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15 | ; The y dimension array |
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16 | ; |
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17 | ; |
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18 | ; @returns |
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19 | ; |
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20 | ; |
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21 | ; @restrictions |
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22 | ; |
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23 | ; |
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24 | ; @examples |
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25 | ; |
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26 | ; |
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27 | ; @history |
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28 | ; |
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29 | ; |
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30 | ; @version |
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31 | ; $Id$ |
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32 | ;- |
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33 | function numtri, index, nx, ny |
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34 | ; |
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35 | compile_opt idl2, strictarrsubs |
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36 | ; |
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37 | |
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38 | y=index/nx |
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39 | x=index-y*nx |
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40 | numtri = (y NE 0)*(nx-1)*(2*(y-1)+1) + (2-(y EQ (ny-1) OR y EQ (ny-1)))*x |
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41 | |
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42 | return, numtri |
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43 | end |
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44 | |
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45 | |
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46 | ;+ |
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47 | ; |
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48 | ; @file_comments |
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49 | ; Define a triangulation array like TRIANGULATE but for a |
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50 | ; E-grid type |
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51 | ; |
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52 | ; @categories |
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53 | ; Make contours with E-grid type |
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54 | ; |
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55 | ; @param NX {in}{required} |
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56 | ; The x dimension array |
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57 | ; |
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58 | ; @param NY {in}{required} |
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59 | ; The y dimension array |
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60 | ; |
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61 | ; @param SINGULAR {in}{optional} |
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62 | ; When singular is undefined all rectangles are cut in using the vertical |
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63 | ; diagonal. |
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64 | ; Singular is a vector which contains the rectangles numbers which are cut in |
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65 | ; using the horizontal diagonal. |
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66 | ; The rectangle number is defined by the index (in a nx*ny vector) of the |
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67 | ; lower-left corner of the rectangle. |
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68 | ; |
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69 | ; @keyword SHIFTED |
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70 | ; |
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71 | ; |
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72 | ; @returns |
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73 | ; Triangles is a 2d array and is dimensions are 3 and (nx-1)*(ny-1). |
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74 | ; Triangles is defined like in the TRIANGULATE procedure. |
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75 | ; |
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76 | ; @history |
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77 | ; Sebastien Masson (smlod\@ipsl.jussieu.fr) |
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78 | ; June 2001 |
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79 | ; |
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80 | ; @version |
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81 | ; $Id$ |
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82 | ; |
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83 | ; @todo |
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84 | ; seb: documenter SHIFTED |
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85 | ;- |
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86 | FUNCTION definetri_e, nx, ny, singular, SHIFTED = shifted |
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87 | ; |
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88 | compile_opt idl2, strictarrsubs |
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89 | ; |
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90 | nx = long(nx) |
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91 | ny = long(ny) |
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92 | triangles = lonarr(3, 2*(nx-1)*(ny-1)) |
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93 | ; |
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94 | ; build the base triangulation with the diamond cut in two triangles |
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95 | ; by the vertical diagonal |
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96 | ; |
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97 | ; first line |
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98 | index = lindgen(nx-1) |
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99 | trinumber = index |
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100 | triangles[0, trinumber] = index |
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101 | triangles[1, trinumber] = index+1 |
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102 | triangles[2, trinumber] = index+(nx+1-shifted) |
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103 | ; last line |
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104 | index = (ny-1)*nx+lindgen(nx-1) |
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105 | trinumber = numtri(index, nx, ny) |
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106 | triangles[0, trinumber] = index |
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107 | triangles[1, trinumber] = index+(-nx+((index/nx+1-shifted) MOD 2)) |
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108 | triangles[2, trinumber] = index+1 |
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109 | ; other lines |
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110 | if ny GT 2 then begin |
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111 | index = lindgen(nx, ny) |
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112 | index = index[0:nx-2, 1:ny-2] |
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113 | index = index[*] |
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114 | oddeven = (index/nx+1-shifted) MOD 2 |
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115 | trinumber = numtri(index, nx, ny) |
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116 | triangles[0, trinumber] = index |
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117 | triangles[1, trinumber] = index-nx+oddeven |
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118 | triangles[2, trinumber] = index+nx+oddeven |
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119 | triangles[0, trinumber+1] = index+nx+oddeven |
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120 | triangles[1, trinumber+1] = index-nx+oddeven |
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121 | triangles[2, trinumber+1] = index+1 |
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122 | endif |
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123 | ; |
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124 | ; cut the diamond specified by singular in two triangles |
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125 | ; by the horizontal diagonal |
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126 | ; |
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127 | IF keyword_set(singular) then BEGIN |
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128 | yindex = singular/nx |
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129 | otherline = where(yindex NE 0 AND yindex NE (ny-1)) |
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130 | if otherline[0] NE -1 then begin |
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131 | index = singular[otherline] |
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132 | oddeven = (index/nx+1-shifted) MOD 2 |
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133 | trinumber = numtri(index, nx, ny) |
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134 | triangles[0, trinumber] = index |
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135 | triangles[1, trinumber] = index-nx+oddeven |
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136 | triangles[2, trinumber] = index+1 |
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137 | triangles[0, trinumber+1] = index |
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138 | triangles[1, trinumber+1] = index+1 |
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139 | triangles[2, trinumber+1] = index+nx+oddeven |
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140 | endif |
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141 | |
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142 | endif |
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143 | return, triangles |
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144 | end |
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145 | |
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