445    float normals[3][2];  in make_circle()  local
452    normals[0][0] = b->y2 - b->y1;  in make_circle()
453    normals[0][1] = b->x1 - b->x2;  in make_circle()
454    dist = sqrt(normals[0][0]*normals[0][0] + normals[0][1]*normals[0][1]);  in make_circle()
457    normals[0][0] /= dist;  in make_circle()
458    normals[0][1] /= dist;  in make_circle()
460    normals[2][0] = b->y4 - b->y3;  in make_circle()
461    normals[2][1] = b->x3 - b->x4;  in make_circle()
462    dist = sqrt(normals[2][0]*normals[2][0] + normals[2][1]*normals[2][1]);  in make_circle()
465    normals[2][0] /= dist;  in make_circle()
466    normals[2][1] /= dist;  in make_circle()
468    normals[1][0] = b->x1 - b->x2 - b->x3 + b->x4;  in make_circle()
469    normals[1][1] = b->y1 - b->y2 - b->y3 + b->y4;  in make_circle()
470    dist = -1*sqrt(normals[1][0]*normals[1][0] + normals[1][1]*normals[1][1]);  in make_circle()
471    normals[1][0] /= dist;  in make_circle()
472    normals[1][1] /= dist;  in make_circle()
475       float cos_a = normals[i][0]*normals[i+1][0] + normals[i][1]*normals[i+1][1];  in make_circle()
485       normals[1][0] = -normals[1][0];  in make_circle()
486       normals[1][1] = -normals[1][1];  in make_circle()
492    circle[0][0] = b->x1 + normals[0][0]*offset;  in make_circle()
493    circle[0][1] = b->y1 + normals[0][1]*offset;  in make_circle()
495    circle[1][0] = 0.5*(b->x1 + b->x4) + normals[1][0]*offset;  in make_circle()
496    circle[1][1] = 0.5*(b->y1 + b->y4) + normals[1][1]*offset;  in make_circle()
498    circle[2][0] = b->x4 + normals[2][0]*offset;  in make_circle()
499    circle[2][1] = b->y4 + normals[2][1]*offset;  in make_circle()
506       o->x2 = circle[i][0] - normals[i][1]*kappa;  in make_circle()
507       o->y2 = circle[i][1] + normals[i][0]*kappa;  in make_circle()
508       o->x3 = circle[i+1][0] + normals[i+1][1]*kappa;  in make_circle()
509       o->y3 = circle[i+1][1] - normals[i+1][0]*kappa;  in make_circle()