Flutter Custom Clipper Radius

Question

I am trying to make a custom clipper by a Custom Clipper in FLutter but I don't know how could I add some round corners in my Shape

Screenshot of required result on Left and my result on right:

Here is my clipper code

class SideArrowClip extends CustomClipper<Path> {
  @override
  Path getClip(Size size) {
    final Path path = Path();
    final double startMargin = size.width / 14;
    final double s1 = size.height * 0.4;
    final double s2 = size.height * 0.6;
    print('S1:$s1 SH:${size.height / 2} S2:$s2');
    path.lineTo(startMargin, 0);
    path.lineTo(startMargin, s1);
    path.lineTo(0, size.height / 2);
    path.lineTo(startMargin, s2);
    path.lineTo(startMargin, size.height);
    path.lineTo(size.width, size.height);
    path.lineTo(size.width, 0);
    path.close();
    return path;
  }

  @override
  bool shouldReclip(CustomClipper<Path> oldClipper) {
    return true;
  }
}

Culpa

Answer 1

I used addRRect(RRect.fromRectAndRadius for rounded rectangle

import 'package:flutter/material.dart';

    class SideArrowClipper extends CustomClipper<Path> {
      @override
      Path getClip(Size size) {
        final double width = size.width;
        final double height = size.height;
        final double startMargin = width / 14;

        final double s1 = height * 0.3;
        final double s2 = height * 0.7;
        final Path path = Path()
          ..addRRect(RRect.fromRectAndRadius(
              Rect.fromLTWH(startMargin, 0, width-startMargin, height),
              const Radius.circular(5)))
          ..lineTo(startMargin, s1)
          ..lineTo(0, size.height / 2)
          ..lineTo(startMargin, s2)
          ..close();
        return path;
      }

      @override
      bool shouldReclip(CustomClipper<Path> oldClipper) {
        return oldClipper != this;
      }
    }

Culpa

Answer 2

I would recommend having a look at this flutter_custom_clippers plugin. This plugin allows you to use various interesting shapes such as the MessageClipper() shown in the image below. If rotated 90 degrees, this could suit your needs.

Alternatively, you could put together a TriangleClipper() and a simple Container() with an oval border to give rounded edges.

As shown in the example in the link above it looks something like this:

ClipPath(
  clipper: MessageClipper(borderRadius: 16),
  child: Container(
    height: 200,
    decoration: BoxDecoration(
      borderRadius: BorderRadius.all(Radius.circular(16.0)),
      color: Colors.red,
    ),
    child: Center(child: Text("MessageClipper()")),
),

Proselytize

I know this library but rotating is not a straight forward solution – Culpa

Answer 3

One more way to implement it is to use path.arcToPoint method before each anger. Here is my sample how I've implemented it:

  @override
  Path getClip(Size size) {
    final path = Path();
    path.moveTo(2.0, 0.0);
    path.lineTo(size.width - size.width/PolygonClipperConst.RATIO_CLIPPER_VAL - 1 , 0.0);
    path.arcToPoint(Offset(size.width - size.width/PolygonClipperConst.RATIO_CLIPPER_VAL + 1 , 2.0), radius: Radius.circular(PolygonClipperConst.RADIUS));
    path.lineTo(size.width - 1, size.height/2 - 1);
    path.arcToPoint(Offset(size.width - 1, size.height/2 + 1), radius: Radius.circular(PolygonClipperConst.RADIUS));
    path.lineTo(size.width - size.width/PolygonClipperConst.RATIO_CLIPPER_VAL + 1, size.height - 1);
    path.arcToPoint(Offset(size.width - size.width/PolygonClipperConst.RATIO_CLIPPER_VAL - 1, size.height), radius: Radius.circular(PolygonClipperConst.RADIUS));
    path.lineTo(2, size.height);
    path.arcToPoint(Offset(0.0, size.height - 1), radius: Radius.circular(PolygonClipperConst.RADIUS));
    path.lineTo(0.0, 1.0);
    path.arcToPoint(Offset(1.0, 0.0), radius: Radius.circular(PolygonClipperConst.RADIUS));
    path.close();
    return path;
  }

And this is a shape with radius corner radius of 2 px:

Nautical

can you add a screenshot? I think my solution is more simple – Culpa

I've added the shape of this path – Nautical