284 lines
21 KiB
C
284 lines
21 KiB
C
/*****************************************************************************/
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/* */
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/* (triangle.h) */
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/* */
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/* Include file for programs that call Triangle. */
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/* */
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/* Accompanies Triangle Version 1.3 */
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/* July 19, 1996 */
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/* */
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/* Copyright 1996 */
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/* Jonathan Richard Shewchuk */
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/* School of Computer Science */
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/* Carnegie Mellon University */
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/* 5000 Forbes Avenue */
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/* Pittsburgh, Pennsylvania 15213-3891 */
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/* jrs@cs.cmu.edu */
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/* */
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/*****************************************************************************/
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/*****************************************************************************/
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/* */
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/* How to call Triangle from another program */
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/* */
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/* */
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/* If you haven't read Triangle's instructions (run "triangle -h" to read */
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/* them), you won't understand what follows. */
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/* */
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/* Triangle must be compiled into an object file (triangle.o) with the */
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/* TRILIBRARY symbol defined (preferably by using the -DTRILIBRARY compiler */
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/* switch). The makefile included with Triangle will do this for you if */
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/* you run "make trilibrary". The resulting object file can be called via */
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/* the procedure triangulate(). */
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/* */
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/* If the size of the object file is important to you, you may wish to */
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/* generate a reduced version of triangle.o. The REDUCED symbol gets rid */
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/* of all features that are primarily of research interest. Specifically, */
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/* the -DREDUCED switch eliminates Triangle's -i, -F, -s, and -C switches. */
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/* The CDT_ONLY symbol gets rid of all meshing algorithms above and beyond */
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/* constrained Delaunay triangulation. Specifically, the -DCDT_ONLY switch */
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/* eliminates Triangle's -r, -q, -a, -S, and -s switches. */
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/* */
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/* IMPORTANT: These definitions (TRILIBRARY, REDUCED, CDT_ONLY) must be */
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/* made in the makefile or in triangle.c itself. Putting these definitions */
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/* in this file will not create the desired effect. */
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/* */
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/* */
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/* The calling convention for triangulate() follows. */
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/* */
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/* void triangulate(triswitches, in, out, vorout) */
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/* char *triswitches; */
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/* struct triangulateio *in; */
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/* struct triangulateio *out; */
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/* struct triangulateio *vorout; */
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/* */
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/* `triswitches' is a string containing the command line switches you wish */
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/* to invoke. No initial dash is required. Some suggestions: */
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/* */
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/* - You'll probably find it convenient to use the `z' switch so that */
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/* points (and other items) are numbered from zero. This simplifies */
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/* indexing, because the first item of any type always starts at index */
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/* [0] of the corresponding array, whether that item's number is zero or */
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/* one. */
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/* - You'll probably want to use the `Q' (quiet) switch in your final code, */
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/* but you can take advantage of Triangle's printed output (including the */
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/* `V' switch) while debugging. */
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/* - If you are not using the `q' or `a' switches, then the output points */
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/* will be identical to the input points, except possibly for the */
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/* boundary markers. If you don't need the boundary markers, you should */
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/* use the `N' (no nodes output) switch to save memory. (If you do need */
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/* boundary markers, but need to save memory, a good nasty trick is to */
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/* set out->pointlist equal to in->pointlist before calling triangulate(),*/
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/* so that Triangle overwrites the input points with identical copies.) */
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/* - The `I' (no iteration numbers) and `g' (.off file output) switches */
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/* have no effect when Triangle is compiled with TRILIBRARY defined. */
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/* */
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/* `in', `out', and `vorout' are descriptions of the input, the output, */
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/* and the Voronoi output. If the `v' (Voronoi output) switch is not used, */
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/* `vorout' may be NULL. `in' and `out' may never be NULL. */
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/* */
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/* Certain fields of the input and output structures must be initialized, */
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/* as described below. */
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/* */
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/*****************************************************************************/
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/*****************************************************************************/
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/* */
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/* The `triangulateio' structure. */
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/* */
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/* Used to pass data into and out of the triangulate() procedure. */
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/* */
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/* */
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/* Arrays are used to store points, triangles, markers, and so forth. In */
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/* all cases, the first item in any array is stored starting at index [0]. */
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/* However, that item is item number `1' unless the `z' switch is used, in */
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/* which case it is item number `0'. Hence, you may find it easier to */
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/* index points (and triangles in the neighbor list) if you use the `z' */
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/* switch. Unless, of course, you're calling Triangle from a Fortran */
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/* program. */
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/* */
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/* Description of fields (except the `numberof' fields, which are obvious): */
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/* */
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/* `pointlist': An array of point coordinates. The first point's x */
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/* coordinate is at index [0] and its y coordinate at index [1], followed */
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/* by the coordinates of the remaining points. Each point occupies two */
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/* REALs. */
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/* `pointattributelist': An array of point attributes. Each point's */
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/* attributes occupy `numberofpointattributes' REALs. */
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/* `pointmarkerlist': An array of point markers; one int per point. */
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/* */
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/* `trianglelist': An array of triangle corners. The first triangle's */
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/* first corner is at index [0], followed by its other two corners in */
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/* counterclockwise order, followed by any other nodes if the triangle */
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/* represents a nonlinear element. Each triangle occupies */
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/* `numberofcorners' ints. */
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/* `triangleattributelist': An array of triangle attributes. Each */
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/* triangle's attributes occupy `numberoftriangleattributes' REALs. */
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/* `trianglearealist': An array of triangle area constraints; one REAL per */
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/* triangle. Input only. */
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/* `neighborlist': An array of triangle neighbors; three ints per */
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/* triangle. Output only. */
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/* */
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/* `segmentlist': An array of segment endpoints. The first segment's */
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/* endpoints are at indices [0] and [1], followed by the remaining */
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/* segments. Two ints per segment. */
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/* `segmentmarkerlist': An array of segment markers; one int per segment. */
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/* */
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/* `holelist': An array of holes. The first hole's x and y coordinates */
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/* are at indices [0] and [1], followed by the remaining holes. Two */
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/* REALs per hole. Input only, although the pointer is copied to the */
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/* output structure for your convenience. */
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/* */
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/* `regionlist': An array of regional attributes and area constraints. */
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/* The first constraint's x and y coordinates are at indices [0] and [1], */
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/* followed by the regional attribute and index [2], followed by the */
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/* maximum area at index [3], followed by the remaining area constraints. */
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/* Four REALs per area constraint. Note that each regional attribute is */
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/* used only if you select the `A' switch, and each area constraint is */
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/* used only if you select the `a' switch (with no number following), but */
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/* omitting one of these switches does not change the memory layout. */
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/* Input only, although the pointer is copied to the output structure for */
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/* your convenience. */
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/* */
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/* `edgelist': An array of edge endpoints. The first edge's endpoints are */
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/* at indices [0] and [1], followed by the remaining edges. Two ints per */
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/* edge. Output only. */
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/* `edgemarkerlist': An array of edge markers; one int per edge. Output */
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/* only. */
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/* `normlist': An array of normal vectors, used for infinite rays in */
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/* Voronoi diagrams. The first normal vector's x and y magnitudes are */
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/* at indices [0] and [1], followed by the remaining vectors. For each */
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/* finite edge in a Voronoi diagram, the normal vector written is the */
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/* zero vector. Two REALs per edge. Output only. */
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/* */
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/* */
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/* Any input fields that Triangle will examine must be initialized. */
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/* Furthermore, for each output array that Triangle will write to, you */
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/* must either provide space by setting the appropriate pointer to point */
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/* to the space you want the data written to, or you must initialize the */
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/* pointer to NULL, which tells Triangle to allocate space for the results. */
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/* The latter option is preferable, because Triangle always knows exactly */
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/* how much space to allocate. The former option is provided mainly for */
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/* people who need to call Triangle from Fortran code, though it also makes */
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/* possible some nasty space-saving tricks, like writing the output to the */
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/* same arrays as the input. */
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/* */
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/* Triangle will not free() any input or output arrays, including those it */
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/* allocates itself; that's up to you. */
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/* */
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/* Here's a guide to help you decide which fields you must initialize */
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/* before you call triangulate(). */
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/* */
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/* `in': */
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/* */
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/* - `pointlist' must always point to a list of points; `numberofpoints' */
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/* and `numberofpointattributes' must be properly set. */
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/* `pointmarkerlist' must either be set to NULL (in which case all */
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/* markers default to zero), or must point to a list of markers. If */
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/* `numberofpointattributes' is not zero, `pointattributelist' must */
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/* point to a list of point attributes. */
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/* - If the `r' switch is used, `trianglelist' must point to a list of */
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/* triangles, and `numberoftriangles', `numberofcorners', and */
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/* `numberoftriangleattributes' must be properly set. If */
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/* `numberoftriangleattributes' is not zero, `triangleattributelist' */
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/* must point to a list of triangle attributes. If the `a' switch is */
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/* used (with no number following), `trianglearealist' must point to a */
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/* list of triangle area constraints. `neighborlist' may be ignored. */
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/* - If the `p' switch is used, `segmentlist' must point to a list of */
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/* segments, `numberofsegments' must be properly set, and */
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/* `segmentmarkerlist' must either be set to NULL (in which case all */
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/* markers default to zero), or must point to a list of markers. */
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/* - If the `p' switch is used without the `r' switch, then */
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/* `numberofholes' and `numberofregions' must be properly set. If */
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/* `numberofholes' is not zero, `holelist' must point to a list of */
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/* holes. If `numberofregions' is not zero, `regionlist' must point to */
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/* a list of region constraints. */
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/* - If the `p' switch is used, `holelist', `numberofholes', */
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/* `regionlist', and `numberofregions' is copied to `out'. (You can */
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/* nonetheless get away with not initializing them if the `r' switch is */
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/* used.) */
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/* - `edgelist', `edgemarkerlist', `normlist', and `numberofedges' may be */
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/* ignored. */
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/* */
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/* `out': */
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/* */
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/* - `pointlist' must be initialized (NULL or pointing to memory) unless */
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/* the `N' switch is used. `pointmarkerlist' must be initialized */
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/* unless the `N' or `B' switch is used. If `N' is not used and */
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/* `in->numberofpointattributes' is not zero, `pointattributelist' must */
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/* be initialized. */
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/* - `trianglelist' must be initialized unless the `E' switch is used. */
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/* `neighborlist' must be initialized if the `n' switch is used. If */
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/* the `E' switch is not used and (`in->numberofelementattributes' is */
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/* not zero or the `A' switch is used), `elementattributelist' must be */
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/* initialized. `trianglearealist' may be ignored. */
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/* - `segmentlist' must be initialized if the `p' or `c' switch is used, */
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/* and the `P' switch is not used. `segmentmarkerlist' must also be */
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/* initialized under these circumstances unless the `B' switch is used. */
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/* - `edgelist' must be initialized if the `e' switch is used. */
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/* `edgemarkerlist' must be initialized if the `e' switch is used and */
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/* the `B' switch is not. */
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/* - `holelist', `regionlist', `normlist', and all scalars may be ignored.*/
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/* */
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/* `vorout' (only needed if `v' switch is used): */
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/* */
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/* - `pointlist' must be initialized. If `in->numberofpointattributes' */
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/* is not zero, `pointattributelist' must be initialized. */
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/* `pointmarkerlist' may be ignored. */
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/* - `edgelist' and `normlist' must both be initialized. */
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/* `edgemarkerlist' may be ignored. */
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/* - Everything else may be ignored. */
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/* */
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/* After a call to triangulate(), the valid fields of `out' and `vorout' */
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/* will depend, in an obvious way, on the choice of switches used. Note */
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/* that when the `p' switch is used, the pointers `holelist' and */
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/* `regionlist' are copied from `in' to `out', but no new space is */
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/* allocated; be careful that you don't free() the same array twice. On */
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/* the other hand, Triangle will never copy the `pointlist' pointer (or any */
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/* others); new space is allocated for `out->pointlist', or if the `N' */
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/* switch is used, `out->pointlist' remains uninitialized. */
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/* */
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/* All of the meaningful `numberof' fields will be properly set; for */
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/* instance, `numberofedges' will represent the number of edges in the */
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/* triangulation whether or not the edges were written. If segments are */
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/* not used, `numberofsegments' will indicate the number of boundary edges. */
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/* */
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/*****************************************************************************/
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struct triangulateio {
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REAL *pointlist; /* In / out */
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REAL *pointattributelist; /* In / out */
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int *pointmarkerlist; /* In / out */
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int numberofpoints; /* In / out */
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int numberofpointattributes; /* In / out */
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int *trianglelist; /* In / out */
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REAL *triangleattributelist; /* In / out */
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REAL *trianglearealist; /* In only */
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int *neighborlist; /* Out only */
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int numberoftriangles; /* In / out */
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int numberofcorners; /* In / out */
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int numberoftriangleattributes; /* In / out */
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int *segmentlist; /* In / out */
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int *segmentmarkerlist; /* In / out */
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int numberofsegments; /* In / out */
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REAL *holelist; /* In / pointer to array copied out */
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int numberofholes; /* In / copied out */
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REAL *regionlist; /* In / pointer to array copied out */
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int numberofregions; /* In / copied out */
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int *edgelist; /* Out only */
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int *edgemarkerlist; /* Not used with Voronoi diagram; out only */
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REAL *normlist; /* Used only with Voronoi diagram; out only */
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int numberofedges; /* Out only */
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};
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#ifdef ANSI_DECLARATORS
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void triangulate(char *, struct triangulateio *, struct triangulateio *,
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struct triangulateio *);
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#else /* not ANSI_DECLARATORS */
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void triangulate();
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#endif /* not ANSI_DECLARATORS */
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