2 * Generates the repetitive part of the gnuplot input
3 * for generating the initial triangle vertices from SGT's
10 int main(int argc, const char **argv) {
11 static const int prec= DBL_DIG+2;
14 if (argc!=1) { fputs("need no args\n",stderr); exit(8); }
18 printf("%d %d %d %d %d\n%%-%d.%dg\n",
22 FOR_VERTEX(vi, INNER) {
23 int x= vi & XMASK; /* distance along strip */
24 int y= vi >> YSHIFT; /* distance across strip */
25 double u= y * 1.0 / (Y-1); /* SGT's u runs 0..1 across the strip */
27 /* SGT's v runs 0..pi along the strip, where the join is at 0==pi.
28 * So that corresponds to 0..X (since 0==X in our scheme).
29 * Vertices with odd y coordinate are halfway to the next x coordinate.
31 double v= (x*2 + (y&1)) * 1.0 / (X*2);
35 printf("%-*.*g %-*.*g # %03x %2d %2d\n",
36 prec+5,prec,u, prec+5,prec,v,