Bezier function

quadraticbezier.dart

Offset getQuadraticBezier(List<Offset> offsetList, double t,
    {Canvas canvas, Paint paint}) {
  return getQuadraticBezier2(
      offsetList, t, 0, offsetList.length - 1, canvas, paint);
}

Offset getQuadraticBezier2(List<Offset> offsetList, double t, int i, int j,
    Canvas canvas, Paint paint) {
  if (i == j) return offsetList[i];

  Offset b0 = getQuadraticBezier2(offsetList, t, i, j - 1, canvas, paint);
  Offset b1 = getQuadraticBezier2(offsetList, t, i + 1, j, canvas, paint);
  Offset res =
      new Offset((1 - t) * b0.dx + t * b1.dx, (1 - t) * b0.dy + t * b1.dy);
  if (canvas != null && paint != null) {
    canvas.drawLine(b1, b0, paint);
    canvas.drawCircle(res, 2.0, paint);
  }
  return res;
}