Lines Matching full:eta1
298 arc->eta1 = atan2(sin(lambda1) / arc->b,
303 /* make sure we have eta1 <= eta2 <= eta1 + 2 PI */
304 arc->eta2 -= two_pi * floor((arc->eta2 - arc->eta1) / two_pi);
306 /* the preceding correction fails if we have exactly et2 - eta1 = 2 PI
308 if ((lambda2 - lambda1 > M_PI) && (arc->eta2 - arc->eta1 < M_PI)) {
312 arc->eta1 = lambda1;
324 double a_cos_eta1 = arc->a * cos(arc->eta1);
325 double b_sin_eta1 = arc->b * sin(arc->eta1);
532 min_eta = MIN2(arc->eta1, arc->eta2);
533 max_eta = MAX2(arc->eta1, arc->eta2);
582 d_eta = (arc->eta2 - arc->eta1) / n;
583 eta_b = arc->eta1;
