Check out the latest version of Routino: svn co http://routino.org/svn/trunk routino
Contents of /trunk/src/segments.h
Parent Directory
| 
Revision Log
Revision 1603 -
(show annotations)
(download)
(as text)
Mon Oct 13 18:25:27 2014 UTC (10 years, 5 months ago) by amb
File MIME type: text/x-chdr
File size: 7892 byte(s)
Mon Oct 13 18:25:27 2014 UTC (10 years, 5 months ago) by amb
File MIME type: text/x-chdr
File size: 7892 byte(s)
Try to speed up the search for the closest node/segment by minimising the number of nodes that are examined in detail.
| 1 | /*************************************** |
| 2 | $Header: /home/amb/CVS/routino/src/segments.h,v 1.38 2010-12-21 17:18:41 amb Exp $ |
| 3 | |
| 4 | A header file for the segments. |
| 5 | |
| 6 | Part of the Routino routing software. |
| 7 | ******************/ /****************** |
| 8 | This file Copyright 2008-2014 Andrew M. Bishop |
| 9 | |
| 10 | This program is free software: you can redistribute it and/or modify |
| 11 | it under the terms of the GNU Affero General Public License as published by |
| 12 | the Free Software Foundation, either version 3 of the License, or |
| 13 | (at your option) any later version. |
| 14 | |
| 15 | This program is distributed in the hope that it will be useful, |
| 16 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | GNU Affero General Public License for more details. |
| 19 | |
| 20 | You should have received a copy of the GNU Affero General Public License |
| 21 | along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 22 | ***************************************/ |
| 23 | |
| 24 | |
| 25 | #ifndef SEGMENTS_H |
| 26 | #define SEGMENTS_H /*+ To stop multiple inclusions. +*/ |
| 27 | |
| 28 | #include <stdint.h> |
| 29 | |
| 30 | #include "types.h" |
| 31 | |
| 32 | #include "cache.h" |
| 33 | #include "files.h" |
| 34 | #include "profiles.h" |
| 35 | |
| 36 | |
| 37 | /* Data structures */ |
| 38 | |
| 39 | |
| 40 | /*+ A structure containing a single segment. +*/ |
| 41 | struct _Segment |
| 42 | { |
| 43 | index_t node1; /*+ The index of the starting node. +*/ |
| 44 | index_t node2; /*+ The index of the finishing node. +*/ |
| 45 | |
| 46 | index_t next2; /*+ The index of the next segment sharing node2. +*/ |
| 47 | |
| 48 | index_t way; /*+ The index of the way associated with the segment. +*/ |
| 49 | |
| 50 | distance_t distance; /*+ The distance between the nodes. +*/ |
| 51 | }; |
| 52 | |
| 53 | |
| 54 | /*+ A structure containing the header from the file. +*/ |
| 55 | typedef struct _SegmentsFile |
| 56 | { |
| 57 | index_t number; /*+ The number of segments in total. +*/ |
| 58 | index_t snumber; /*+ The number of super-segments. +*/ |
| 59 | index_t nnumber; /*+ The number of normal segments. +*/ |
| 60 | } |
| 61 | SegmentsFile; |
| 62 | |
| 63 | |
| 64 | /*+ A structure containing a set of segments (and pointers to mmap file). +*/ |
| 65 | struct _Segments |
| 66 | { |
| 67 | SegmentsFile file; /*+ The header data from the file. +*/ |
| 68 | |
| 69 | #if !SLIM |
| 70 | |
| 71 | void *data; /*+ The memory mapped data. +*/ |
| 72 | |
| 73 | Segment *segments; /*+ An array of segments. +*/ |
| 74 | |
| 75 | #else |
| 76 | |
| 77 | int fd; /*+ The file descriptor for the file. +*/ |
| 78 | |
| 79 | Segment cached[4]; /*+ Three cached segments read from the file in slim mode. +*/ |
| 80 | index_t incache[4]; /*+ The indexes of the cached segments. +*/ |
| 81 | |
| 82 | SegmentCache *cache; /*+ A RAM cache of segments read from the file. +*/ |
| 83 | |
| 84 | #endif |
| 85 | }; |
| 86 | |
| 87 | |
| 88 | /* Functions in segments.c */ |
| 89 | |
| 90 | Segments *LoadSegmentList(const char *filename); |
| 91 | |
| 92 | void DestroySegmentList(Segments *segments); |
| 93 | |
| 94 | index_t FindClosestSegmentHeading(Nodes *nodes,Segments *segments,Ways *ways,index_t node1,double heading,Profile *profile); |
| 95 | |
| 96 | distance_t Distance(double lat1,double lon1,double lat2,double lon2); |
| 97 | |
| 98 | double DeltaLat(double lon,distance_t distance); |
| 99 | double DeltaLon(double lat,distance_t distance); |
| 100 | |
| 101 | duration_t Duration(Segment *segmentp,Way *wayp,Profile *profile); |
| 102 | |
| 103 | double TurnAngle(Nodes *nodes,Segment *segment1p,Segment *segment2p,index_t node); |
| 104 | double BearingAngle(Nodes *nodes,Segment *segmentp,index_t node); |
| 105 | |
| 106 | |
| 107 | static inline Segment *NextSegment(Segments *segments,Segment *segmentp,index_t node); |
| 108 | |
| 109 | |
| 110 | /* Macros and inline functions */ |
| 111 | |
| 112 | /*+ Return true if this is a normal segment. +*/ |
| 113 | #define IsNormalSegment(xxx) (((xxx)->distance)&SEGMENT_NORMAL) |
| 114 | |
| 115 | /*+ Return true if this is a super-segment. +*/ |
| 116 | #define IsSuperSegment(xxx) (((xxx)->distance)&SEGMENT_SUPER) |
| 117 | |
| 118 | /*+ Return true if the segment is oneway. +*/ |
| 119 | #define IsOneway(xxx) ((xxx)->distance&(ONEWAY_2TO1|ONEWAY_1TO2)) |
| 120 | |
| 121 | /*+ Return true if the segment is oneway towards the specified node. +*/ |
| 122 | #define IsOnewayTo(xxx,yyy) ((xxx)->node1==(yyy)?((xxx)->distance&ONEWAY_2TO1):((xxx)->distance&ONEWAY_1TO2)) |
| 123 | |
| 124 | /*+ Return true if the segment is oneway from the specified node. +*/ |
| 125 | #define IsOnewayFrom(xxx,yyy) ((xxx)->node2==(yyy)?((xxx)->distance&ONEWAY_2TO1):((xxx)->distance&ONEWAY_1TO2)) |
| 126 | |
| 127 | /*+ Return the other node in the segment that is not the specified node. +*/ |
| 128 | #define OtherNode(xxx,yyy) ((xxx)->node1==(yyy)?(xxx)->node2:(xxx)->node1) |
| 129 | |
| 130 | |
| 131 | #if !SLIM |
| 132 | |
| 133 | /*+ Return a segment pointer given a set of segments and an index. +*/ |
| 134 | #define LookupSegment(xxx,yyy,ppp) (&(xxx)->segments[yyy]) |
| 135 | |
| 136 | /*+ Return a segment index given a set of segments and a pointer. +*/ |
| 137 | #define IndexSegment(xxx,yyy) (index_t)((yyy)-&(xxx)->segments[0]) |
| 138 | |
| 139 | |
| 140 | /*++++++++++++++++++++++++++++++++++++++ |
| 141 | Find the next segment with a particular starting node. |
| 142 | |
| 143 | Segment *NextSegment Returns a pointer to the next segment. |
| 144 | |
| 145 | Segments *segments The set of segments to use. |
| 146 | |
| 147 | Segment *segmentp The current segment. |
| 148 | |
| 149 | index_t node The wanted node. |
| 150 | ++++++++++++++++++++++++++++++++++++++*/ |
| 151 | |
| 152 | static inline Segment *NextSegment(Segments *segments,Segment *segmentp,index_t node) |
| 153 | { |
| 154 | if(segmentp->node1==node) |
| 155 | { |
| 156 | segmentp++; |
| 157 | |
| 158 | if(IndexSegment(segments,segmentp)>=segments->file.number || segmentp->node1!=node) |
| 159 | return(NULL); |
| 160 | else |
| 161 | return(segmentp); |
| 162 | } |
| 163 | else |
| 164 | { |
| 165 | if(segmentp->next2==NO_SEGMENT) |
| 166 | return(NULL); |
| 167 | else |
| 168 | return(LookupSegment(segments,segmentp->next2,1)); |
| 169 | } |
| 170 | } |
| 171 | |
| 172 | #else |
| 173 | |
| 174 | /* Prototypes */ |
| 175 | |
| 176 | static inline Segment *LookupSegment(Segments *segments,index_t index,int position); |
| 177 | |
| 178 | static inline index_t IndexSegment(Segments *segments,Segment *segmentp); |
| 179 | |
| 180 | CACHE_NEWCACHE_PROTO(Segment) |
| 181 | CACHE_DELETECACHE_PROTO(Segment) |
| 182 | CACHE_FETCHCACHE_PROTO(Segment) |
| 183 | CACHE_INVALIDATECACHE_PROTO(Segment) |
| 184 | |
| 185 | |
| 186 | /* Inline functions */ |
| 187 | |
| 188 | CACHE_STRUCTURE(Segment) |
| 189 | CACHE_NEWCACHE(Segment) |
| 190 | CACHE_DELETECACHE(Segment) |
| 191 | CACHE_FETCHCACHE(Segment) |
| 192 | CACHE_INVALIDATECACHE(Segment) |
| 193 | |
| 194 | |
| 195 | /*++++++++++++++++++++++++++++++++++++++ |
| 196 | Find the Segment information for a particular segment. |
| 197 | |
| 198 | Segment *LookupSegment Returns a pointer to the cached segment information. |
| 199 | |
| 200 | Segments *segments The set of segments to use. |
| 201 | |
| 202 | index_t index The index of the segment. |
| 203 | |
| 204 | int position The position in the cache to store the value. |
| 205 | ++++++++++++++++++++++++++++++++++++++*/ |
| 206 | |
| 207 | static inline Segment *LookupSegment(Segments *segments,index_t index,int position) |
| 208 | { |
| 209 | segments->cached[position-1]=*FetchCachedSegment(segments->cache,index,segments->fd,sizeof(SegmentsFile)); |
| 210 | |
| 211 | segments->incache[position-1]=index; |
| 212 | |
| 213 | return(&segments->cached[position-1]); |
| 214 | } |
| 215 | |
| 216 | |
| 217 | /*++++++++++++++++++++++++++++++++++++++ |
| 218 | Find the segment index for a particular segment pointer. |
| 219 | |
| 220 | index_t IndexSegment Returns the index of the segment in the list. |
| 221 | |
| 222 | Segments *segments The set of segments to use. |
| 223 | |
| 224 | Segment *segmentp The segment whose index is to be found. |
| 225 | ++++++++++++++++++++++++++++++++++++++*/ |
| 226 | |
| 227 | static inline index_t IndexSegment(Segments *segments,Segment *segmentp) |
| 228 | { |
| 229 | int position1=segmentp-&segments->cached[0]; |
| 230 | |
| 231 | return(segments->incache[position1]); |
| 232 | } |
| 233 | |
| 234 | |
| 235 | /*++++++++++++++++++++++++++++++++++++++ |
| 236 | Find the next segment with a particular starting node. |
| 237 | |
| 238 | Segment *NextSegment Returns a pointer to the next segment. |
| 239 | |
| 240 | Segments *segments The set of segments to use. |
| 241 | |
| 242 | Segment *segmentp The current segment. |
| 243 | |
| 244 | index_t node The wanted node. |
| 245 | ++++++++++++++++++++++++++++++++++++++*/ |
| 246 | |
| 247 | static inline Segment *NextSegment(Segments *segments,Segment *segmentp,index_t node) |
| 248 | { |
| 249 | int position=segmentp-&segments->cached[-1]; |
| 250 | |
| 251 | if(segmentp->node1==node) |
| 252 | { |
| 253 | index_t index=IndexSegment(segments,segmentp); |
| 254 | |
| 255 | index++; |
| 256 | |
| 257 | if(index>=segments->file.number) |
| 258 | return(NULL); |
| 259 | |
| 260 | segmentp=LookupSegment(segments,index,position); |
| 261 | |
| 262 | if(segmentp->node1!=node) |
| 263 | return(NULL); |
| 264 | else |
| 265 | return(segmentp); |
| 266 | } |
| 267 | else |
| 268 | { |
| 269 | if(segmentp->next2==NO_SEGMENT) |
| 270 | return(NULL); |
| 271 | else |
| 272 | return(LookupSegment(segments,segmentp->next2,position)); |
| 273 | } |
| 274 | } |
| 275 | |
| 276 | #endif |
| 277 | |
| 278 | |
| 279 | #endif /* SEGMENTS_H */ |
Properties
| Name | Value |
|---|---|
| cvs:description | Header file for segments. |