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1 | module raffle__dist_calcs | ||
2 | !! Module containing distance calculators | ||
3 | !! | ||
4 | !! This module contains procedures to calculate the distance between atoms | ||
5 | !! and other points in the system. | ||
6 | use raffle__constants, only: pi,real32 | ||
7 | use raffle__geom_rw, only: basis_type | ||
8 | use raffle__misc_linalg, only: get_angle | ||
9 | implicit none | ||
10 | |||
11 | |||
12 | private | ||
13 | |||
14 | public :: get_min_dist | ||
15 | public :: get_min_dist_between_point_and_atom | ||
16 | public :: get_min_dist_between_point_and_species | ||
17 | public :: get_dist_between_point_and_atom | ||
18 | |||
19 | |||
20 | contains | ||
21 | |||
22 | !############################################################################### | ||
23 | 379777 | pure function get_min_dist( & | |
24 | basis, loc, lignore_close, axis, labove, lreal, tol & | ||
25 |
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379777 | ) result(output) |
26 | !! Return the minimum distance between a point and the nearest atom | ||
27 | !! in a cell. | ||
28 | !! | ||
29 | !! This function returns the minimum distance between a point and the | ||
30 | !! nearest atom in a periodic cell. | ||
31 | implicit none | ||
32 | |||
33 | ! Arguments | ||
34 | logical, intent(in) :: lignore_close | ||
35 | !! If true, ignore atoms that are really close to the point. | ||
36 | class(basis_type), intent(in) :: basis | ||
37 | !! The basis of the cell. | ||
38 | real(real32), dimension(3), intent(in) :: loc | ||
39 | !! The location of the point (in crystal coordinates). | ||
40 | |||
41 | integer, intent(in), optional :: axis | ||
42 | !! The axis along which to calculate the distance (if undefined, the | ||
43 | !! distance is calculated in all directions). | ||
44 | real(real32), intent(in), optional :: tol | ||
45 | !! The tolerance for the distance. | ||
46 | logical, intent(in), optional :: labove, lreal | ||
47 | !! If true, return the real distance, otherwise return the vector. | ||
48 | real(real32), dimension(3) :: output | ||
49 | !! The minimum distance between the point and the nearest atom. | ||
50 | |||
51 | |||
52 | ! Local variables | ||
53 | integer :: js, ja, i | ||
54 | !! Loop counters. | ||
55 | integer :: axis_ | ||
56 | !! Axis along which to calculate the distance. | ||
57 | real(real32) :: dtmp1 | ||
58 | !! Temporary variables. | ||
59 | real(real32) :: min_bond | ||
60 | !! Minimum bond length. | ||
61 | real(real32) :: tol_ | ||
62 | !! Tolerance for the distance. | ||
63 | logical :: labove_, lreal_ | ||
64 | !! Booleans for above and real distance arguments | ||
65 | real(real32), dimension(3) :: vdtmp1, vdtmp2 | ||
66 | !! Vectors for distance calculations. | ||
67 | |||
68 | |||
69 | ! CORRECT tol TO ACCOUNT FOR LATTICE SIZE | ||
70 | 379777 | tol_ = 1.E-5_real32 | |
71 | 379777 | labove_ = .false. | |
72 | 379777 | lreal_ = .true. | |
73 | 379777 | axis_ = 0 | |
74 |
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379777 | if(present(tol)) tol_ = tol |
75 | |||
76 |
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379777 | if(present(labove)) labove_ = labove |
77 | |||
78 |
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379777 | if(present(lreal)) lreal_ = lreal |
79 | |||
80 |
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379777 | if(present(axis)) axis_=axis |
81 | |||
82 | 379777 | min_bond=huge(0._real32) | |
83 |
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1519108 | output = 0._real32 |
84 |
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1408784 | do js = 1, basis%nspec |
85 |
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5621186 | atmloop: do ja = 1, basis%spec(js)%num |
86 |
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4212402 | if(.not.basis%spec(js)%atom_mask(ja)) cycle atmloop |
87 |
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8180264 | vdtmp1 = basis%spec(js)%atom(ja,:3) - loc |
88 |
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8180264 | if(lignore_close.and.norm2(vdtmp1).lt.tol_) cycle atmloop |
89 |
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2045066 | if(axis_.gt.0)then |
90 | ✗ | if(abs(vdtmp1(axis_)).lt.tol_) cycle atmloop | |
91 | ✗ | if(labove_)then | |
92 | ✗ | vdtmp1(axis_) = 1._real32 + vdtmp1(axis_) | |
93 | else | ||
94 | ✗ | vdtmp1(axis_) = vdtmp1(axis_) - 1._real32 | |
95 | end if | ||
96 | else | ||
97 |
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8180264 | vdtmp1 = vdtmp1 - ceiling(vdtmp1 - 0.5_real32) |
98 | end if | ||
99 | 2045066 | vdtmp2 = matmul(vdtmp1,basis%lat) | |
100 |
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8180264 | dtmp1 = norm2(vdtmp2) |
101 |
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3074073 | if(dtmp1.lt.min_bond)then |
102 | 829681 | min_bond = dtmp1 | |
103 |
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829681 | if(lreal_)then |
104 |
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3318724 | output = vdtmp2 |
105 | else | ||
106 | ✗ | output = vdtmp1 | |
107 | end if | ||
108 | end if | ||
109 | end do atmloop | ||
110 | end do | ||
111 | |||
112 | 379777 | end function get_min_dist | |
113 | !############################################################################### | ||
114 | |||
115 | |||
116 | !############################################################################### | ||
117 | 1 | pure function get_min_dist_between_point_and_atom(basis,loc,atom) result(dist) | |
118 | !! Return the minimum distance between a point and an atom in a cell. | ||
119 | !! | ||
120 | !! This function returns the minimum distance between a point and an atom | ||
121 | !! in a periodic cell. | ||
122 | implicit none | ||
123 | |||
124 | ! Arguments | ||
125 | class(basis_type), intent(in) :: basis | ||
126 | !! The basis of the cell. | ||
127 | integer, dimension(2), intent(in) :: atom | ||
128 | !! The index of the atom in the cell (species, atom). | ||
129 | real(real32), dimension(3), intent(in) :: loc | ||
130 | !! The location of the point (in crystal coordinates). | ||
131 | real(real32) :: dist | ||
132 | !! The minimum distance between the point and the atom. | ||
133 | |||
134 | ! Local variables | ||
135 | real(real32), dimension(3) :: vec | ||
136 | !! Vector between the point and the atom. | ||
137 | |||
138 |
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4 | vec = loc - basis%spec(atom(1))%atom(atom(2),:3) |
139 |
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4 | vec = vec - ceiling(vec - 0.5_real32) |
140 |
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4 | vec = matmul(vec,basis%lat) |
141 |
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4 | dist = norm2(vec) |
142 | |||
143 | 1 | end function get_min_dist_between_point_and_atom | |
144 | !############################################################################### | ||
145 | |||
146 | |||
147 | !############################################################################### | ||
148 | 3 | pure function get_min_dist_between_point_and_species( & | |
149 | basis, loc, species) result(dist) | ||
150 | !! Return the minimum distance between a point and a species in a cell. | ||
151 | !! | ||
152 | !! This function returns the minimum distance between a point and any | ||
153 | !! instance of the specified species in a periodic cell. | ||
154 | implicit none | ||
155 | |||
156 | ! Arguments | ||
157 | class(basis_type), intent(in) :: basis | ||
158 | !! The basis of the cell. | ||
159 | integer, intent(in) :: species | ||
160 | !! The index of the species in the cell. | ||
161 | real(real32), dimension(3), intent(in) :: loc | ||
162 | !! The location of the point (in crystal coordinates). | ||
163 | real(real32) :: dist | ||
164 | !! The minimum distance between the point and the species. | ||
165 | |||
166 | ! Local variables | ||
167 | integer :: ia, i | ||
168 | !! Loop indices. | ||
169 | real(real32) :: rtmp1 | ||
170 | !! Temporary variable. | ||
171 | real(real32), dimension(3) :: vec | ||
172 | !! Vector between the point and the atom. | ||
173 | |||
174 | |||
175 | 3 | dist = huge(0._real32) | |
176 |
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7 | atom_loop: do ia = 1,basis%spec(species)%num |
177 |
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4 | if(.not.basis%spec(species)%atom_mask(ia)) cycle atom_loop |
178 |
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12 | vec = loc - basis%spec(species)%atom(ia,:3) |
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12 | vec = vec - ceiling(vec - 0.5_real32) |
180 |
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12 | vec = matmul(vec, basis%lat) |
181 |
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12 | rtmp1 = norm2(vec) |
182 |
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6 | if( rtmp1 .lt. dist ) dist = rtmp1 |
183 | end do atom_loop | ||
184 | |||
185 | 3 | end function get_min_dist_between_point_and_species | |
186 | !############################################################################### | ||
187 | |||
188 | |||
189 | !############################################################################### | ||
190 | 2 | pure function get_dist_between_point_and_atom(basis,loc,atom) result(dist) | |
191 | !! Return the distance between a point and an atom in a cell. | ||
192 | !! | ||
193 | !! This function returns the distance between a point and an atom in a cell. | ||
194 | implicit none | ||
195 | |||
196 | ! Arguments | ||
197 | class(basis_type), intent(in) :: basis | ||
198 | !! The basis of the cell. | ||
199 | integer, dimension(2), intent(in) :: atom | ||
200 | !! The index of the atom in the cell (species, atom). | ||
201 | real(real32), dimension(3), intent(in) :: loc | ||
202 | !! The location of the point (in crystal coordinates). | ||
203 | real(real32) :: dist | ||
204 | !! The minimum distance between the point and the atom. | ||
205 | |||
206 | ! Local variables | ||
207 | real(real32), dimension(3) :: vec | ||
208 | !! Vector between the point and the atom. | ||
209 | |||
210 |
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8 | vec = loc - basis%spec(atom(1))%atom(atom(2),:3) |
211 |
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8 | vec = matmul(vec,basis%lat) |
212 |
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8 | dist = norm2(vec) |
213 | |||
214 | 2 | end function get_dist_between_point_and_atom | |
215 | !############################################################################### | ||
216 | |||
217 | end module raffle__dist_calcs | ||
218 |