modify_path_revert.c

Example showing how to revert points in existing path.

#include <stdio.h>
#include <stdlib.h> 
#include <string.h>
#include <stdbool.h>
#include <math.h>

#include "lib/gwyscan.h"

int main()
{
    int i;
    int ndata;
    double *xydata, *xydata_revert;
        
    /***********************************     path generation     **********************************/
    // LabView friendly implementation    

    ndata = gwyscan_create_path_regular(NULL, 20, 20, 1, 1, 10, 10, 0, GWYSCAN_DIRECTION_FORWARD_ALTERNATEBLOCK);
    xydata = malloc(2*ndata * sizeof(double));
    gwyscan_create_path_regular(xydata, 20, 20, 1, 1, 10, 10, 0, GWYSCAN_DIRECTION_FORWARD_ALTERNATEBLOCK);

    xydata_revert = malloc(2*ndata * sizeof(double));
    gwyscan_modify_path_revert(xydata_revert, xydata, ndata);

    FILE* fp = fopen("scan_path_revert_in.txt", "wt");
    if (fp == NULL) {
        printf("Error. Unable to open file for writing %s \n", strerror(errno));
        return 0;
    }
    for (i = 0; i < ndata; i++)
        fprintf(fp, "%d %g %g\n", i, xydata[2*i], xydata[2*i + 1]);
    fclose(fp);

    fp = fopen("scan_path_revert_out.txt", "wt");
    if (fp == NULL) {
        printf("Error. Unable to open file for writing %s \n", strerror(errno));
        return 0;
    }
    for (i = 0; i < ndata; i++)
        fprintf(fp, "%d %g %g\n", i, xydata_revert[2*i], xydata_revert[2*i + 1]);
    fclose(fp);

    free(xydata);
    free(xydata_revert);

    return 0;
}