如何在颤振中获得这样的渐变？

Question

我正在尝试创建一个精确的渐变。但没有成功。我尝试添加颜色值，但没有得到以下结果。我对颤振完全陌生，任何形式的帮助将不胜感激！

我的代码：

  @override
  void paint(Canvas canvas, Size size) {

    final rect = new Rect.fromLTWH(0.0, 0.0, size.width, size.height);
    final gradient = new LinearGradient(
      colors: [Color(0xffF3985F),Color(0xffF28053),Color(0xffF36456),Color(0xffF24F58),Color(0xffF24D67)],
      //stops: [0.0, 1.0],
      begin: FractionalOffset.bottomLeft,
      end: FractionalOffset.topRight,
    );

    var paint1 = Paint()
      ..shader = gradient.createShader(rect)
      ..style = PaintingStyle.fill;
    //a rectangle
    canvas.drawRect(Offset(0, 0) & Size(width, 0.35 * height), paint1);
  }