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/* cutout_hex --- plot hexagons that can be cut out easily 2020-08-26 */

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <math.h>

#include <unistd.h>

#include "hpgllib.h"

#define RADIANS (M_PI / 180.0)

void hexgrid(const double side, const int nx, const int ny);

int main(int argc, char * const argv[])

{

int opt;

double side;

double maxx, maxy;

while ((opt = getopt(argc, argv, "no:p:s:t:v:")) != -1) {

switch (opt) {

case 's':

case 'n':

case 'o':

case 'p':

case 't':

case 'v':

plotopt(opt, optarg);

break;

default: /* '?' */

fprintf(stderr, "Usage: %s [-p pen] [-s <size>] [-t title]\n", argv[0]);

fprintf(stderr, " <size> ::= A1 | A2 | A3 | A4 | A5\n");

exit(EXIT_FAILURE);

}

if (plotbegin(1) < 0) {

fputs("Failed to initialise HPGL library\n", stderr);

exit(EXIT_FAILURE);

}

getplotsize(&maxx, &maxy);

// side = 50.08 * 40.0;

// hexgrid(side, 4, 2);

side = 45.0 * 40.0;

hexgrid(side, 5, 3);

plotend();

return (0);

}

void hexgrid(const double side, const int nx, const int ny)

{

int i, j;

const double width = 2.0 * side * cos(30.0 * RADIANS);

for (i = 0; i < ny; i++) {

const double y = 2.0 * side * (double)i;

const double y1 = y + (side * sin(30.0 * RADIANS));

#ifdef TRISECT

const double y2 = y + side;

#endif

const double y3 = y1 + side;

const double y4 = y + (2.0 * side);

for (j = 0; j < nx; j++) {

const double x = width * (double)j;

const double x1 = x + (side * cos(30 * RADIANS));

const double x2 = x + width;

moveto(x, y1);

lineto(x1, y);

lineto(x2, y1);

}

for (j = 0; j < (nx + 1); j++) {

const double x = width * (double)j;

moveto(x, y1);

lineto(x, y3);

}

for (j = 0; j < nx; j++) {

const double x = width * (double)j;

const double x1 = x + (side * cos(30 * RADIANS));

const double x2 = x + width;

moveto(x, y3);

lineto(x1, y4);

lineto(x2, y3);

}

#ifdef TRISECT

for (j = 0; j < nx; j++) {

const double x = width * (double)j;

const double x1 = x + (side * cos(30 * RADIANS));

const double x2 = x + width;

moveto(x, y1);

lineto(x1, y2);

lineto(x2, y1);

}

for (j = 0; j < nx; j++) {

const double x = width * (double)j;

const double x1 = x + (side * cos(30 * RADIANS));

moveto(x1, y2);

lineto(x1, y4);

}

#endif

}