161 lines
4.9 KiB
C
161 lines
4.9 KiB
C
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - *
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* ##### # # # *
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* #### ##### ###### # # # # # # # *
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* # # # # # ## # # # # # *
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* # # # # ##### # # # # #### # ### *
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* # # ##### # # # # # # # # # # *
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* # # # # # ## # # # # # # *
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* #### # ###### # # ##### ##### # # *
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* *
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* Mattia Montanari | University of Oxford 2019 *
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* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - *
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* *
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* This file runs an example to illustrate how to invoke the openGJK lib *
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* within a C program. An executable called 'demo' can be compiled with *
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* CMake. This reads the coordinates of two polytopes from the input *
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* files userP.dat and userQ.dat, respectively, and returns the minimum *
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* distance between them computed using the openGJK library. *
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* *
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* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
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/**
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* @file main.c
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* @author Mattia Montanari
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* @date April 2018
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* @brief File illustrating an application that invokes openGJK.
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*
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*/
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#define _CRT_HAS_CXX17 0
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#include <stdio.h>
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/* For importing openGJK this is Step 1: include header in subfolder. */
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#include "openGJK/openGJK.h"
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#ifndef WIN32
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#define fscanf_s fscanf
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#endif
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/**
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* @brief Function for reading input file with body's coordinates.
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*
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*/
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int readinput ( const char *inputfile, double ***pts, int * out ) {
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int npoints = 0;
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int idx = 0;
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FILE *fp;
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/* Open file. */
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#ifdef WIN32
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errno_t err;
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if ((err = fopen_s(&fp, inputfile, "r")) != 0) {
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#else
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if ((fp = fopen(inputfile, "r")) == NULL) {
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#endif
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fprintf(stdout, "ERROR: input file %s not found!\n", inputfile);
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fprintf(stdout, " -> The file must be in the folder from which this program is launched\n\n");
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return 1;
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}
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/* Read number of input vertices. */
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if (fscanf_s(fp, "%d", &npoints) != 1)
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return 1;
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/* Allocate memory. */
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double **arr = (double **)malloc(npoints * sizeof(double *));
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for (int i=0; i<npoints; i++)
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arr[i] = (double *)malloc(3 * sizeof(double));
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/* Read and store vertices' coordinates. */
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for (idx = 0; idx < npoints; idx++)
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{
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if (fscanf_s(fp, "%lf %lf %lf\n", &arr[idx][0], &arr[idx][1], &arr[idx][2]) != 3 )
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return 1;
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}
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/* Close file. */
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fclose(fp);
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/* Pass pointers. */
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*pts = arr;
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*out = idx;
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return (0);
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}
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/**
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* @brief Main program of example1_c (described in Section 3.1 of the paper).
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*
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*/
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int main() {
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/* Squared distance computed by openGJK. */
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double dd;
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/* Structure of simplex used by openGJK. */
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struct simplex s;
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/* Number of vertices defining body 1 and body 2, respectively. */
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int nvrtx1,
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nvrtx2;
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/* Structures of body 1 and body 2, respectively. */
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struct bd bd1;
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struct bd bd2;
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/* Specify name of input files for body 1 and body 2, respectively. */
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char inputfileA[40] = "userP.dat",
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inputfileB[40] = "userQ.dat";
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/* Pointers to vertices' coordinates of body 1 and body 2, respectively. */
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double (**vrtx1) = NULL,
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(**vrtx2) = NULL;
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/* For importing openGJK this is Step 2: adapt the data structure for the
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* two bodies that will be passed to the GJK procedure. */
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/* Import coordinates of object 1. */
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if (readinput ( inputfileA, &vrtx1, &nvrtx1 ))
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return (1);
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bd1.coord = vrtx1;
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bd1.numpoints = nvrtx1;
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/* Import coordinates of object 2. */
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if (readinput ( inputfileB, &vrtx2, &nvrtx2 ))
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return (1);
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bd2.coord = vrtx2;
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bd2.numpoints = nvrtx2;
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/* Initialise simplex as empty */
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s.nvrtx = 0;
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#ifdef DEBUG
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/* Verify input of body A. */
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for (int i = 0; i < bd1.numpoints; ++i) {
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printf ( "%.2f ", vrtx1[i][0]);
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printf ( "%.2f ", vrtx1[i][1]);
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printf ( "%.2f\n", bd1.coord[i][2]);
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}
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/* Verify input of body B. */
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for (int i = 0; i < bd2.numpoints; ++i) {
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printf ( "%.2f ", bd2.coord[i][0]);
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printf ( "%.2f ", bd2.coord[i][1]);
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printf ( "%.2f\n", bd2.coord[i][2]);
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}
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#endif
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/* For importing openGJK this is Step 3: invoke the GJK procedure. */
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/* Compute squared distance using GJK algorithm. */
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dd = gjk (bd1, bd2, &s);
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/* Print distance between objects. */
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printf ("Distance between bodies %f\n", dd);
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/* Free memory */
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for (int i=0; i<bd1.numpoints; i++)
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free(bd1.coord[i]);
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free(bd1.coord);
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for (int i=0; i<bd2.numpoints; i++)
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free(bd2.coord[i]);
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free(bd2.coord);
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return (0);
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}
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