INNER CODE UNIT · Dart

b

LanarsInc/animated-bottom-navigation-bar-flutter · lib/src/circular_notched_and_cornered_shape.dart:103

    double b = host.top - guest.center.dy;

    double n2 = math.sqrt(b * b * r * r * (a * a + b * b - r * r));
    double p2xA = ((a * r * r) - n2) / (a * a + b * b);
    double p2xB = ((a * r * r) + n2) / (a * a + b * b);
    double p2yA = math.sqrt(r * r - p2xA * p2xA);
    double p2yB = math.sqrt(r * r - p2xB * p2xB);

    List<Offset> p = List.filled(6, Offset.zero, growable: true);

    // p0, p1, and p2 are the control points for segment A.
    p[0] = Offset(a - s1, b);
    p[1] = Offset(a, b);
    double cmp = b < 0 ? -1.0 : 1.0;
    p[2] = cmp * p2yA > cmp * p2yB ? Offset(p2xA, p2yA) : Offset(p2xB, p2yB);

    // p3, p4, and p5 are the control points for segment B, which is a mirror
    // of segment A around the y axis.

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