Flutter Curve Bar

Question

I wonder if there is a better solution for making a curved bar like the following image.

Here is my flutter code:

import \'package:flutter_web/m         


        

Answer 1

make a custom ShapeBorder class like this one (the key method is _getPath that returns your shape's Path):

class CustomShapeBorder extends ShapeBorder {
  const CustomShapeBorder();

  @override
  Path getInnerPath(Rect rect, {TextDirection textDirection}) => _getPath(rect);

  @override
  Path getOuterPath(Rect rect, {TextDirection textDirection}) => _getPath(rect);

  _getPath(Rect rect) {
    final r = rect.height / 2;
    final radius = Radius.circular(r);
    final offset = Rect.fromCircle(center: Offset.zero, radius: r);
    return Path()
      ..moveTo(rect.topLeft.dx, rect.topLeft.dy)
      ..relativeArcToPoint(offset.bottomRight, clockwise: false, radius: radius)
      ..lineTo(rect.center.dx - r, rect.center.dy)
      ..relativeArcToPoint(offset.bottomRight, clockwise: true, radius: radius)
      ..relativeArcToPoint(offset.topRight, clockwise: true, radius: radius)
      ..lineTo(rect.centerRight.dx - r, rect.centerRight.dy)
      ..relativeArcToPoint(offset.topRight, clockwise: false, radius: radius)
      ..addRect(rect);
  }

  @override
  EdgeInsetsGeometry get dimensions {
    return EdgeInsets.all(0);
  }

  @override
  ShapeBorder scale(double t) {
    return CustomShapeBorder();
  }

  @override
  void paint(Canvas canvas, Rect rect, {TextDirection textDirection}) {
  }
}

now you can use it like:

    Container(
      margin: EdgeInsets.only(top: 80),
      height: 50,
      width: double.infinity,
      decoration: ShapeDecoration(
        shape: CustomShapeBorder(),
        //color: Colors.orange,
        gradient:
            LinearGradient(colors: [Colors.blue, Colors.orange]),
        shadows: [
          BoxShadow(
              color: Colors.black, offset: Offset(3, -3), blurRadius: 3),
        ],
      ),
    ),

Result: