Plum Fade

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 500 500" width="100%"><defs><linearGradient id="blob-gradient" x1="0.146" y1="0.146" x2="0.854" y2="0.854"><stop offset="0" stop-color="#7c5cff"/><stop offset="1" stop-color="#ef629f"/></linearGradient></defs><path d="M418,323Q366,396,288,411Q210,426,162,370.5Q114,315,136,260.5Q158,206,184,141Q210,76,264.5,119.5Q319,163,394.5,206.5Q470,250,418,323Z" fill="url(#blob-gradient)"/></svg>

.blob {
  width: 500px;
  height: 500px;
  clip-path: path("M418,323Q366,396,288,411Q210,426,162,370.5Q114,315,136,260.5Q158,206,184,141Q210,76,264.5,119.5Q319,163,394.5,206.5Q470,250,418,323Z");
}

/**
 * Blob — generated by blobs.app.
 *
 * Drop this file into your project and render <Blob /> anywhere.
 */
import { useId } from 'react';

export interface BlobProps {
  /** Rendered width and height. A number is treated as px. Defaults to 100%. */
  size?: number | string;
  /** Class name for the root svg element. */
  className?: string;
  /** Accessible name. Without it the graphic is hidden from assistive tech. */
  title?: string;
}

export function Blob({ size = '100%', className, title }: BlobProps) {
  // Unique per instance, so two blobs on one page never share a def id.
  const uid = useId().replace(/[^a-zA-Z0-9]/g, '');
  const titleId = `blob-title-${uid}`;
  const gradientId = `blob-gradient-${uid}`;

  return (
    <svg
      xmlns="http://www.w3.org/2000/svg"
      viewBox="0 0 500 500"
      width={size}
      height={size}
      className={className}
      role={title ? 'img' : undefined}
      aria-labelledby={title ? titleId : undefined}
      aria-hidden={title ? undefined : true}
    >
      {title ? <title id={titleId}>{title}</title> : null}
      <defs>
        <linearGradient id={gradientId} x1="0.146" y1="0.146" x2="0.854" y2="0.854">
          <stop offset="0" stopColor="#7c5cff" />
          <stop offset="1" stopColor="#ef629f" />
        </linearGradient>
      </defs>
      <path
        d="M418,323Q366,396,288,411Q210,426,162,370.5Q114,315,136,260.5Q158,206,184,141Q210,76,264.5,119.5Q319,163,394.5,206.5Q470,250,418,323Z"
        fill={`url(#${gradientId})`}
      />
    </svg>
  );
}

export default Blob;

// Generated by blobs.app.
//
// Paint the blob:
//   CustomPaint(painter: BlobPainter(), size: const Size(300, 300))
//
// Or clip a widget to it:
//   ClipPath(clipper: BlobClipper(), child: child)

import 'dart:ui' as ui;

import 'package:flutter/material.dart';

/// The blob outline, scaled from its 500x500 design space to [size].
Path buildBlobPath(Size size) {
  final double sx = size.width / 500.0;
  final double sy = size.height / 500.0;
  final Path path = Path();
  path.moveTo(418.0 * sx, 323.0 * sy);
  path.quadraticBezierTo(366.0 * sx, 396.0 * sy, 288.0 * sx, 411.0 * sy);
  path.quadraticBezierTo(210.0 * sx, 426.0 * sy, 162.0 * sx, 370.5 * sy);
  path.quadraticBezierTo(114.0 * sx, 315.0 * sy, 136.0 * sx, 260.5 * sy);
  path.quadraticBezierTo(158.0 * sx, 206.0 * sy, 184.0 * sx, 141.0 * sy);
  path.quadraticBezierTo(210.0 * sx, 76.0 * sy, 264.5 * sx, 119.5 * sy);
  path.quadraticBezierTo(319.0 * sx, 163.0 * sy, 394.5 * sx, 206.5 * sy);
  path.quadraticBezierTo(470.0 * sx, 250.0 * sy, 418.0 * sx, 323.0 * sy);
  path.close();
  return path;
}

class BlobPainter extends CustomPainter {
  const BlobPainter();

  @override
  void paint(Canvas canvas, Size size) {
    final Path path = buildBlobPath(size);
    final Paint paint = Paint()
      ..isAntiAlias = true
      ..shader = ui.Gradient.linear(
        Offset(size.width * 0.146, size.height * 0.146),
        Offset(size.width * 0.854, size.height * 0.854),
        const <Color>[Color(0xFF7C5CFF), Color(0xFFEF629F)],
      );
    canvas.drawPath(path, paint);
  }

  @override
  bool shouldRepaint(covariant BlobPainter oldDelegate) => false;
}

/// Clips any widget to the same shape: ClipPath(clipper: BlobClipper(), ...).
class BlobClipper extends CustomClipper<Path> {
  const BlobClipper();

  @override
  Path getClip(Size size) => buildBlobPath(size);

  @override
  bool shouldReclip(covariant CustomClipper<Path> oldClipper) => false;
}