BubbleClipper constructor

BubbleClipper({ required Radius radius, required bool showNip, required BubbleNip nip, required double nipWidth, required double nipHeight, required double nipOffset, required double nipRadius, required bool stick, required EdgeInsets padding, })

Implementation

BubbleClipper({
  required this.radius,
  required this.showNip,
  required this.nip,
  required this.nipWidth,
  required this.nipHeight,
  required this.nipOffset,
  required this.nipRadius,
  required this.stick,
  required this.padding,
})   : assert(nipWidth > 0),
      assert(nipHeight > 0),
      assert(nipRadius >= 0),
      assert(nipRadius <= nipWidth / 2 && nipRadius <= nipHeight / 2),
      super() {
  if (nip == BubbleNip.no) return;

  _startOffset = _endOffset = nipWidth;

  final isCenter =
      nip == BubbleNip.leftCenter || nip == BubbleNip.rightCenter;
  final k = isCenter ? nipHeight / 2 / nipWidth : nipHeight / nipWidth;
  final a = atan(k);

  _nipCX = isCenter
      ? sqrt(nipRadius * nipRadius * (1 + 1 / k / k))
      : (nipRadius + sqrt(nipRadius * nipRadius * (1 + k * k))) / k;
  final nipStickOffset = (_nipCX - nipRadius).floorToDouble();

  _nipCX -= nipStickOffset;
  _nipCY = isCenter ? 0 : nipRadius;
  _nipPX = _nipCX - nipRadius * sin(a);
  _nipPY = _nipCY + nipRadius * cos(a);
  _startOffset -= nipStickOffset;
  _endOffset -= nipStickOffset;

  if (stick) _endOffset = 0;
}