osaxma

// taken from: https://github.com/iampawan/FlutterBackdrop
// copy paste to https://dartpad.dev/ and should work 

import 'package:flutter/material.dart';

void main() {
  runApp(MaterialApp(
    debugShowCheckedModeBanner: false,
    theme: ThemeData(primarySwatch: Colors.teal),
    home: BackdropPage(),

osaxma

// answer for:
// https://stackoverflow.com/questions/64826393/how-can-i-implement-this-specific-scroll-animation-using-flutter/
import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(

osaxma

Notes on working with Hasura & Postgres docker containers in a local mac environment.

Table of content:

• Hasura
• Postgres
  • Query with psql
  • PostgrSQL Data or Schema Dump
  • SechmaSpy
• GraphQL
• GraphQL Schema Export

osaxma

// Based on Flutter 1.26.0-17.3.pre Dart SDK 2.10.4
// filed issue at https://github.com/dart-lang/sdk/issues/44876
main() {
 final datetimeParsed = DateTime.parse('2021-02-05T22:37:12.933232+00:00');
 final datetimeMS = DateTime.fromMicrosecondsSinceEpoch(1612564632933232);
  
 print(datetimeParsed.toIso8601String()); // prints 2021-02-05T22:37:12.933Z
 print(datetimeMS.toUtc().toIso8601String()); // prints 2021-02-05T22:37:12.933Z
  
 print(datetimeParsed.microsecondsSinceEpoch); // prints 1612564632933000

osaxma

import 'dart:async';
import 'package:meta/meta.dart';
import 'package:hasura_connect/hasura_connect.dart';
import 'package:http/http.dart' as http;

// problem:
// when subscribing to`HasuraConnect.subscription`, a websocket connection is created on the first subscription
// call. The websocket connection is created only once with the initial subscription and the provided TokenInterceptor
// or headers. When the token expires during an active subscription, HasuraConnect doesn't stop the subscription, or try
// to reconnect with the latest token in in the TokenInterceptor nor does it throw an error. It'll keep calling `onRequest` 

osaxma

// so it doesn't conflict with Image from material package
import 'dart:ui' as ui;

import 'package:flutter/material.dart';

// svg from hero patterns (I Like Food): https://www.heropatterns.com/
// converted to CustomPainter code using: https://fluttershapemaker.com/

void main() {
runApp(SvgPatternExample());

osaxma

// credit: https://stackoverflow.com/a/9195706/10976714

// The formulas to calculate the coordinates of a point at any given position (from 0 to 1) on the Bezier curve are:
//  x(t) = (1-t)^2 * x1 + 2 * (1-t) * t * x2 + t^2 * x3
//  y(t) = (1-t)^2 * y1 + 2 * (1-t) * t * y2 + t^2 * y3
//  where (x1, y1) is the starting point, (x2, y2) is the control point and (x3, y3) is the end point.

// get a point along the Bezier curve line
// If you pass the start, end & control points, along with 0.5 for the halfway position, you get the offset to that point
Offset getQuadraticCurvePoint(Offset start, Offset control, Offset end, double position) {

osaxma

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);
  @override

osaxma

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override

osaxma

import 'dart:math';

import 'package:flutter/material.dart';

void main() {
  runApp(const WindowApp());
}

class WindowApp extends StatelessWidget {
  const WindowApp({Key? key}) : super(key: key);