Hardcoded Curved Paramater

[Pseudo-codigo]

The curve parameter is hardcoded within the FlippableBox class.

Here's the fixed version:

`import 'dart:math';

import 'package:flutter/material.dart';

class FlippableBox extends StatelessWidget {
final double clipRadius;
final double duration;
final Curve curve;
final bool flipVt;
final BoxDecoration bg;
final Container front;
final Container back;

final bool isFlipped;

const FlippableBox(
{Key key,
this.isFlipped = false,
this.front,
this.back,
this.bg,
this.clipRadius,
this.duration = 1,
this.curve = Curves.easeOut,
this.flipVt = false})
: super(key: key);

@OverRide
Widget build(BuildContext context) {
return TweenAnimationBuilder(
duration: Duration(milliseconds: (duration * 1000).round()),
curve: curve,
tween: Tween(begin: 0.0, end: isFlipped ? 180.0 : 0.0),
builder: (context, value, child) {
var content = value >= 90 ? back : front;
return Rotation3d(
rotationY: !flipVt ? value : 0,
rotationX: flipVt ? value : 0,
child: Rotation3d(
rotationY: !flipVt ? (value > 90 ? 180 : 0) : 0,
rotationX: flipVt ? (value > 90 ? 180 : 0) : 0,
child: ClipRRect(
borderRadius: BorderRadius.circular(clipRadius ?? 0),
child: AnimatedBackground(
decoration: bg,
child: content,
),
),
),
);
},
);
}
}

class Rotation3d extends StatelessWidget {
//Degrees to rads constant
static const double degrees2Radians = pi / 180;

final Widget child;
final double rotationX;
final double rotationY;
final double rotationZ;

const Rotation3d(
{Key key,
@required this.child,
this.rotationY = 0,
this.rotationZ = 0,
this.rotationX})
: super(key: key);

@OverRide
Widget build(BuildContext context) {
return Transform(
alignment: FractionalOffset.center,
transform: Matrix4.identity()
..setEntry(3, 2, 0.001)
..rotateX(rotationX * degrees2Radians)
..rotateY(rotationY * degrees2Radians)
..rotateZ(rotationZ * degrees2Radians),
child: child);
}
}

class AnimatedBackground extends StatelessWidget {
final Container child;
final BoxDecoration decoration;

const AnimatedBackground({Key key, this.child, this.decoration})
: super(key: key);

@OverRide
Widget build(BuildContext context) {
return AnimatedContainer(
width: child.constraints.maxWidth,
height: child.constraints.maxHeight,
decoration: decoration,
duration: Duration(milliseconds: 700),
curve: Curves.easeOut,
child: child);
}
}
`