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#include "triangul.h"
#include <math.h>
#include "../../global.h"
//#ifndef HAVE_LOG2
double nlog2( double v )
{
static double tmp_log2 = -1.0;
if (tmp_log2 < 0.0) {
tmp_log2 = 1.0 / log(2.0);
}
return(log(v) * tmp_log2);
}
//#endif
static int choose_idx;
static int permute[SEGSIZE];
/* Generate a random permutation of the segments 1..n */
int generate_random_ordering(n)
int n;
{
int i;
int m, st[SEGSIZE], *p;
choose_idx = 1;
for (i = 0; i <= n; i++)
st[i] = i;
p = st;
for (i = 1; i <= n; i++, p++)
{
m = rand() % (n + 1 - i) + 1;
permute[i] = p[m];
if (m != 1)
p[m] = p[1];
}
return 0;
}
/* Return the next segment in the generated random ordering of all the */
/* segments in S */
int choose_segment()
{
#ifdef DEBUG
fprintf(stderr, "choose_segment: %d\n", permute[choose_idx]);
#endif
return permute[choose_idx++];
}
/* Read in the list of vertices from infile */
int read_segments(filename, genus)
char *filename;
int *genus;
{
FILE *infile;
int ccount;
int i;
int ncontours, npoints, first, last;
if ((infile = fopen(filename, "r")) == NULL)
{
perror(filename);
return -1;
}
fscanf(infile, "%d", &ncontours);
if (ncontours <= 0)
return -1;
/* For every contour, read in all the points for the contour. The */
/* outer-most contour is read in first (points specified in */
/* anti-clockwise order). Next, the inner contours are input in */
/* clockwise order */
ccount = 0;
i = 1;
while (ccount < ncontours)
{
int j;
fscanf(infile, "%d", &npoints);
first = i;
last = first + npoints - 1;
for (j = 0; j < npoints; j++, i++)
{
fscanf(infile, "%lf%lf", &seg[i].v0.x, &seg[i].v0.y);
if (i == last)
{
seg[i].next = first;
seg[i].prev = i-1;
seg[i-1].v1 = seg[i].v0;
}
else if (i == first)
{
seg[i].next = i+1;
seg[i].prev = last;
seg[last].v1 = seg[i].v0;
}
else
{
seg[i].prev = i-1;
seg[i].next = i+1;
seg[i-1].v1 = seg[i].v0;
}
seg[i].is_inserted = FALSE;
}
ccount++;
}
*genus = ncontours - 1;
return i-1;
}
/* Get log*n for given n */
int math_logstar_n(n)
int n;
{
int i;
double v;
for (i = 0, v = (double) n; v >= 1; i++)
v = nlog2(v);
return (i - 1);
}
int math_N(n, h)
int n;
int h;
{
int i;
double v;
for (i = 0, v = (int) n; i < h; i++)
v = nlog2(v);
return (int) ceil((double) 1.0*n/v);
}
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