(Flutter) 到 CustomPaint 小部件的彎曲邊緣

Question

這就是我想要構建的：

（ appBar的形狀而不是內容）

這就是我所擁有的：

我希望邊緣是彎曲的，而不是那么鋒利。

這是我的CustomPaint代碼：

class LogoPainter extends CustomPainter {
  @override
  void paint(Canvas canvas, Size size) {
    Paint paint = Paint();
    paint.color = Colors.blue;
    var path = Path();
    path.lineTo(0, size.height - size.height / 5);
    path.lineTo(size.width / 1.2, size.height);
    path.lineTo(size.width, size.height - size.height / 5);
    path.lineTo(size.width, 0);
    path.close();
    canvas.drawPath(path, paint);
  }

  @override
  bool shouldRepaint(CustomPainter oldDelegate) {
    return true;
  }
}

我如何實現這種彎曲的邊緣？

我嘗試過point.arcToPoint()和point.quadraticBezierTo() ，但沒有成功。

Answer 1

這並不完美，但您可以稍微調整一下數字：

class LogoPainter extends CustomPainter {
  @override
  void paint(Canvas canvas, Size size) {
    Paint paint = Paint();
    paint.color = Colors.blue;
    var path = Path();
    path.lineTo(0, size.height - size.height / 5);
    path.lineTo(size.width / 1.2, size.height);
    //Added this line
    path.relativeQuadraticBezierTo(15, 3, 30, -5);
    path.lineTo(size.width, size.height - size.height / 5);
    path.lineTo(size.width, 0);
    path.close();
    canvas.drawPath(path, paint);
  }

  @override
  bool shouldRepaint(CustomPainter oldDelegate) {
    return true;
  }
}

這段代碼給出了這個結果：

Answer 2

你可以這樣做

class LogoPainter extends CustomPainter {
  @override
  void paint(Canvas canvas, Size size) {
    Paint paint = Paint();
    paint.color = Colors.blue;
    Path path = new Path();
    path.lineTo(0, size.height - size.height / 5);
    //Use the method conicTo
    path.conicTo(size.width / 1.2, size.height, size.width,
        size.height - size.height / 5, 15);
    path.lineTo(size.width, 0);
    path.close();
    canvas.drawPath(path, paint);
  }

  @override
  bool shouldRepaint(covariant CustomPainter oldDelegate) {
    return true;
  }
}

結果