The paint method of "CurvePageSwitcher" to draw tab selection arc

tabselector.dart

//The paint method of "CurvePageSwitcher" to draw tab selection arc
void _drawSwipeAbleArc(Canvas canvas, Size size) {
    Path path = Path();

    path.moveTo(-2, size.height - archBottomOffset);
    path.cubicTo(
        -2,
        size.height - archBottomOffset,
        size.width / 2,
        size.height - arcHeight - archBottomOffset,
        size.width + 2,
        size.height - archBottomOffset);
    path.moveTo(size.width + 2, size.height - archBottomOffset);
    path.close();

    double left, right;
    if (showLeftAsFirstPage) {
      left = size.width / 2 - size.width / 2 * animation.value;
      right = size.width / 2;
      swipeArcPaint.color = Colors.green;
    } else {
      left = size.width / 2;
      right = size.width * animation.value;
      swipeArcPaint.color = Colors.deepPurple;
    }

    canvas.clipRect(Rect.fromLTRB(left, 0, right, size.height));

    canvas.drawPath(path, swipeArcPaint);
  }