triangle.h
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上传日期:2010-04-01
资源大小:155k
文件大小:21k
源码类别:
3D图形编程
开发平台:
C/C++
- /*****************************************************************************/
- /* */
- /* (triangle.h) */
- /* */
- /* Include file for programs that call Triangle. */
- /* */
- /* Accompanies Triangle Version 1.6 */
- /* July 28, 2005 */
- /* */
- /* Copyright 1996, 2005 */
- /* Jonathan Richard Shewchuk */
- /* 2360 Woolsey #H */
- /* Berkeley, California 94705-1927 */
- /* jrs@cs.berkeley.edu */
- /* */
- /*****************************************************************************/
- /*****************************************************************************/
- /* */
- /* How to call Triangle from another program */
- /* */
- /* */
- /* If you haven't read Triangle's instructions (run "triangle -h" to read */
- /* them), you won't understand what follows. */
- /* */
- /* Triangle must be compiled into an object file (triangle.o) with the */
- /* TRILIBRARY symbol defined (generally by using the -DTRILIBRARY compiler */
- /* switch). The makefile included with Triangle will do this for you if */
- /* you run "make trilibrary". The resulting object file can be called via */
- /* the procedure triangulate(). */
- /* */
- /* If the size of the object file is important to you, you may wish to */
- /* generate a reduced version of triangle.o. The REDUCED symbol gets rid */
- /* of all features that are primarily of research interest. Specifically, */
- /* the -DREDUCED switch eliminates Triangle's -i, -F, -s, and -C switches. */
- /* The CDT_ONLY symbol gets rid of all meshing algorithms above and beyond */
- /* constrained Delaunay triangulation. Specifically, the -DCDT_ONLY switch */
- /* eliminates Triangle's -r, -q, -a, -u, -D, -Y, -S, and -s switches. */
- /* */
- /* IMPORTANT: These definitions (TRILIBRARY, REDUCED, CDT_ONLY) must be */
- /* made in the makefile or in triangle.c itself. Putting these definitions */
- /* in this file (triangle.h) will not create the desired effect. */
- /* */
- /* */
- /* The calling convention for triangulate() follows. */
- /* */
- /* void triangulate(triswitches, in, out, vorout) */
- /* char *triswitches; */
- /* struct triangulateio *in; */
- /* struct triangulateio *out; */
- /* struct triangulateio *vorout; */
- /* */
- /* `triswitches' is a string containing the command line switches you wish */
- /* to invoke. No initial dash is required. Some suggestions: */
- /* */
- /* - You'll probably find it convenient to use the `z' switch so that */
- /* points (and other items) are numbered from zero. This simplifies */
- /* indexing, because the first item of any type always starts at index */
- /* [0] of the corresponding array, whether that item's number is zero or */
- /* one. */
- /* - You'll probably want to use the `Q' (quiet) switch in your final code, */
- /* but you can take advantage of Triangle's printed output (including the */
- /* `V' switch) while debugging. */
- /* - If you are not using the `q', `a', `u', `D', `j', or `s' switches, */
- /* then the output points will be identical to the input points, except */
- /* possibly for the boundary markers. If you don't need the boundary */
- /* markers, you should use the `N' (no nodes output) switch to save */
- /* memory. (If you do need boundary markers, but need to save memory, a */
- /* good nasty trick is to set out->pointlist equal to in->pointlist */
- /* before calling triangulate(), so that Triangle overwrites the input */
- /* points with identical copies.) */
- /* - The `I' (no iteration numbers) and `g' (.off file output) switches */
- /* have no effect when Triangle is compiled with TRILIBRARY defined. */
- /* */
- /* `in', `out', and `vorout' are descriptions of the input, the output, */
- /* and the Voronoi output. If the `v' (Voronoi output) switch is not used, */
- /* `vorout' may be NULL. `in' and `out' may never be NULL. */
- /* */
- /* Certain fields of the input and output structures must be initialized, */
- /* as described below. */
- /* */
- /*****************************************************************************/
- /*****************************************************************************/
- /* */
- /* The `triangulateio' structure. */
- /* */
- /* Used to pass data into and out of the triangulate() procedure. */
- /* */
- /* */
- /* Arrays are used to store points, triangles, markers, and so forth. In */
- /* all cases, the first item in any array is stored starting at index [0]. */
- /* However, that item is item number `1' unless the `z' switch is used, in */
- /* which case it is item number `0'. Hence, you may find it easier to */
- /* index points (and triangles in the neighbor list) if you use the `z' */
- /* switch. Unless, of course, you're calling Triangle from a Fortran */
- /* program. */
- /* */
- /* Description of fields (except the `numberof' fields, which are obvious): */
- /* */
- /* `pointlist': An array of point coordinates. The first point's x */
- /* coordinate is at index [0] and its y coordinate at index [1], followed */
- /* by the coordinates of the remaining points. Each point occupies two */
- /* REALs. */
- /* `pointattributelist': An array of point attributes. Each point's */
- /* attributes occupy `numberofpointattributes' REALs. */
- /* `pointmarkerlist': An array of point markers; one int per point. */
- /* */
- /* `trianglelist': An array of triangle corners. The first triangle's */
- /* first corner is at index [0], followed by its other two corners in */
- /* counterclockwise order, followed by any other nodes if the triangle */
- /* represents a nonlinear element. Each triangle occupies */
- /* `numberofcorners' ints. */
- /* `triangleattributelist': An array of triangle attributes. Each */
- /* triangle's attributes occupy `numberoftriangleattributes' REALs. */
- /* `trianglearealist': An array of triangle area constraints; one REAL per */
- /* triangle. Input only. */
- /* `neighborlist': An array of triangle neighbors; three ints per */
- /* triangle. Output only. */
- /* */
- /* `segmentlist': An array of segment endpoints. The first segment's */
- /* endpoints are at indices [0] and [1], followed by the remaining */
- /* segments. Two ints per segment. */
- /* `segmentmarkerlist': An array of segment markers; one int per segment. */
- /* */
- /* `holelist': An array of holes. The first hole's x and y coordinates */
- /* are at indices [0] and [1], followed by the remaining holes. Two */
- /* REALs per hole. Input only, although the pointer is copied to the */
- /* output structure for your convenience. */
- /* */
- /* `regionlist': An array of regional attributes and area constraints. */
- /* The first constraint's x and y coordinates are at indices [0] and [1], */
- /* followed by the regional attribute at index [2], followed by the */
- /* maximum area at index [3], followed by the remaining area constraints. */
- /* Four REALs per area constraint. Note that each regional attribute is */
- /* used only if you select the `A' switch, and each area constraint is */
- /* used only if you select the `a' switch (with no number following), but */
- /* omitting one of these switches does not change the memory layout. */
- /* Input only, although the pointer is copied to the output structure for */
- /* your convenience. */
- /* */
- /* `edgelist': An array of edge endpoints. The first edge's endpoints are */
- /* at indices [0] and [1], followed by the remaining edges. Two ints per */
- /* edge. Output only. */
- /* `edgemarkerlist': An array of edge markers; one int per edge. Output */
- /* only. */
- /* `normlist': An array of normal vectors, used for infinite rays in */
- /* Voronoi diagrams. The first normal vector's x and y magnitudes are */
- /* at indices [0] and [1], followed by the remaining vectors. For each */
- /* finite edge in a Voronoi diagram, the normal vector written is the */
- /* zero vector. Two REALs per edge. Output only. */
- /* */
- /* */
- /* Any input fields that Triangle will examine must be initialized. */
- /* Furthermore, for each output array that Triangle will write to, you */
- /* must either provide space by setting the appropriate pointer to point */
- /* to the space you want the data written to, or you must initialize the */
- /* pointer to NULL, which tells Triangle to allocate space for the results. */
- /* The latter option is preferable, because Triangle always knows exactly */
- /* how much space to allocate. The former option is provided mainly for */
- /* people who need to call Triangle from Fortran code, though it also makes */
- /* possible some nasty space-saving tricks, like writing the output to the */
- /* same arrays as the input. */
- /* */
- /* Triangle will not free() any input or output arrays, including those it */
- /* allocates itself; that's up to you. You should free arrays allocated by */
- /* Triangle by calling the trifree() procedure defined below. (By default, */
- /* trifree() just calls the standard free() library procedure, but */
- /* applications that call triangulate() may replace trimalloc() and */
- /* trifree() in triangle.c to use specialized memory allocators.) */
- /* */
- /* Here's a guide to help you decide which fields you must initialize */
- /* before you call triangulate(). */
- /* */
- /* `in': */
- /* */
- /* - `pointlist' must always point to a list of points; `numberofpoints' */
- /* and `numberofpointattributes' must be properly set. */
- /* `pointmarkerlist' must either be set to NULL (in which case all */
- /* markers default to zero), or must point to a list of markers. If */
- /* `numberofpointattributes' is not zero, `pointattributelist' must */
- /* point to a list of point attributes. */
- /* - If the `r' switch is used, `trianglelist' must point to a list of */
- /* triangles, and `numberoftriangles', `numberofcorners', and */
- /* `numberoftriangleattributes' must be properly set. If */
- /* `numberoftriangleattributes' is not zero, `triangleattributelist' */
- /* must point to a list of triangle attributes. If the `a' switch is */
- /* used (with no number following), `trianglearealist' must point to a */
- /* list of triangle area constraints. `neighborlist' may be ignored. */
- /* - If the `p' switch is used, `segmentlist' must point to a list of */
- /* segments, `numberofsegments' must be properly set, and */
- /* `segmentmarkerlist' must either be set to NULL (in which case all */
- /* markers default to zero), or must point to a list of markers. */
- /* - If the `p' switch is used without the `r' switch, then */
- /* `numberofholes' and `numberofregions' must be properly set. If */
- /* `numberofholes' is not zero, `holelist' must point to a list of */
- /* holes. If `numberofregions' is not zero, `regionlist' must point to */
- /* a list of region constraints. */
- /* - If the `p' switch is used, `holelist', `numberofholes', */
- /* `regionlist', and `numberofregions' is copied to `out'. (You can */
- /* nonetheless get away with not initializing them if the `r' switch is */
- /* used.) */
- /* - `edgelist', `edgemarkerlist', `normlist', and `numberofedges' may be */
- /* ignored. */
- /* */
- /* `out': */
- /* */
- /* - `pointlist' must be initialized (NULL or pointing to memory) unless */
- /* the `N' switch is used. `pointmarkerlist' must be initialized */
- /* unless the `N' or `B' switch is used. If `N' is not used and */
- /* `in->numberofpointattributes' is not zero, `pointattributelist' must */
- /* be initialized. */
- /* - `trianglelist' must be initialized unless the `E' switch is used. */
- /* `neighborlist' must be initialized if the `n' switch is used. If */
- /* the `E' switch is not used and (`in->numberofelementattributes' is */
- /* not zero or the `A' switch is used), `elementattributelist' must be */
- /* initialized. `trianglearealist' may be ignored. */
- /* - `segmentlist' must be initialized if the `p' or `c' switch is used, */
- /* and the `P' switch is not used. `segmentmarkerlist' must also be */
- /* initialized under these circumstances unless the `B' switch is used. */
- /* - `edgelist' must be initialized if the `e' switch is used. */
- /* `edgemarkerlist' must be initialized if the `e' switch is used and */
- /* the `B' switch is not. */
- /* - `holelist', `regionlist', `normlist', and all scalars may be ignored.*/
- /* */
- /* `vorout' (only needed if `v' switch is used): */
- /* */
- /* - `pointlist' must be initialized. If `in->numberofpointattributes' */
- /* is not zero, `pointattributelist' must be initialized. */
- /* `pointmarkerlist' may be ignored. */
- /* - `edgelist' and `normlist' must both be initialized. */
- /* `edgemarkerlist' may be ignored. */
- /* - Everything else may be ignored. */
- /* */
- /* After a call to triangulate(), the valid fields of `out' and `vorout' */
- /* will depend, in an obvious way, on the choice of switches used. Note */
- /* that when the `p' switch is used, the pointers `holelist' and */
- /* `regionlist' are copied from `in' to `out', but no new space is */
- /* allocated; be careful that you don't free() the same array twice. On */
- /* the other hand, Triangle will never copy the `pointlist' pointer (or any */
- /* others); new space is allocated for `out->pointlist', or if the `N' */
- /* switch is used, `out->pointlist' remains uninitialized. */
- /* */
- /* All of the meaningful `numberof' fields will be properly set; for */
- /* instance, `numberofedges' will represent the number of edges in the */
- /* triangulation whether or not the edges were written. If segments are */
- /* not used, `numberofsegments' will indicate the number of boundary edges. */
- /* */
- /*****************************************************************************/
- struct triangulateio {
- REAL *pointlist; /* In / out */
- REAL *pointattributelist; /* In / out */
- int *pointmarkerlist; /* In / out */
- int numberofpoints; /* In / out */
- int numberofpointattributes; /* In / out */
- int *trianglelist; /* In / out */
- REAL *triangleattributelist; /* In / out */
- REAL *trianglearealist; /* In only */
- int *neighborlist; /* Out only */
- int numberoftriangles; /* In / out */
- int numberofcorners; /* In / out */
- int numberoftriangleattributes; /* In / out */
- int *segmentlist; /* In / out */
- int *segmentmarkerlist; /* In / out */
- int numberofsegments; /* In / out */
- REAL *holelist; /* In / pointer to array copied out */
- int numberofholes; /* In / copied out */
- REAL *regionlist; /* In / pointer to array copied out */
- int numberofregions; /* In / copied out */
- int *edgelist; /* Out only */
- int *edgemarkerlist; /* Not used with Voronoi diagram; out only */
- REAL *normlist; /* Used only with Voronoi diagram; out only */
- int numberofedges; /* Out only */
- };
- #ifdef ANSI_DECLARATORS
- void triangulate(char *, struct triangulateio *, struct triangulateio *,
- struct triangulateio *);
- void trifree(VOID *memptr);
- #else /* not ANSI_DECLARATORS */
- void triangulate();
- void trifree();
- #endif /* not ANSI_DECLARATORS */