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feat(game): implement proper barrier detection logic #13

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Merged
ashutosh-7503 merged 1 commit into from
Oct 28, 2025
Merged

feat(game): implement proper barrier detection logic #13

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3 changes: 2 additions & 1 deletion lib/barriers.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@ class MyBarrier extends StatelessWidget {
const MyBarrier({super.key, this.size});

@override
//successfully implemented the barrier code
Widget build(BuildContext context) {
return Container(
width: 100,
Expand All @@ -15,7 +16,7 @@ class MyBarrier extends StatelessWidget {
color: const Color.fromARGB(34, 76, 175, 79),
width: 2,
),
borderRadius: BorderRadius.all(Radius.circular(10)),
borderRadius: const BorderRadius.all(Radius.circular(10)),
),
);
}
Expand Down
78 changes: 58 additions & 20 deletions lib/homepage.dart
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Original file line number Diff line number Diff line change
@@ -1,5 +1,4 @@
import 'dart:async';

import 'package:flappy_bird/barriers.dart';
import 'package:flappy_bird/bird.dart';
import 'package:flutter/material.dart';
Expand All @@ -20,23 +19,26 @@ class _HomepageState extends State<Homepage> {
double barrierx2 = barrierx1 + 1.5;
Timer? gameTimer;
int score = 0;
// ignore: unused_element

void _showDialog() {
showDialog(
context: context,
barrierDismissible: false,
builder: (context) {
return AlertDialog(
backgroundColor: Colors.brown,
title: Text('Game Over', style: TextStyle(color: Colors.white)),
title: const Text('Game Over', style: TextStyle(color: Colors.white)),
content: Text(
'Your bird has fallen!\nScore: $score',
style: TextStyle(color: Colors.white),
style: const TextStyle(color: Colors.white),
),
actions: [
TextButton(
onPressed: resetGame,
child: Text('Restart', style: TextStyle(color: Colors.white)),
child: const Text(
'Restart',
style: TextStyle(color: Colors.white),
),
),
],
);
Expand All @@ -48,14 +50,18 @@ class _HomepageState extends State<Homepage> {
setState(() {
isGameStarted = true;
});
gameTimer = Timer.periodic(Duration(milliseconds: 50), (timer) {

gameTimer = Timer.periodic(const Duration(milliseconds: 50), (timer) {
setState(() {
time += 0.05;
height = -4.9 * time * time + 2.8 * time;
birdY = initialPos - height;

// Move barriers
barrierx1 -= 0.05;
barrierx2 -= 0.05;

// Reposition barriers and increase score
if (barrierx1 < -1.5) {
barrierx1 = 1.5;
score++;
Expand All @@ -64,7 +70,9 @@ class _HomepageState extends State<Homepage> {
barrierx2 = 1.5;
score++;
}
// Score incremented by 1 for each barrier passed

// Check if bird is dead
if (birdisDead()) {
gameTimer?.cancel();
_showDialog();
Expand All @@ -83,7 +91,8 @@ class _HomepageState extends State<Homepage> {
barrierx1 = 1;
barrierx2 = barrierx1 + 1.5;
score = 0;
});
}); // reset the game variables to their initial values

gameTimer?.cancel();
Navigator.of(context).pop();
}
Expand All @@ -94,7 +103,36 @@ class _HomepageState extends State<Homepage> {
}

bool birdisDead() {
return birdY > 1 || birdY < -1;
// Check if bird hits top or bottom of screen
if (birdY > 1 || birdY < -1) {
return true;
}

// Check collision with first barrier
if (barrierx1 >= -0.15 && barrierx1 <= 0.15) {
// Bottom barrier (size 50) - small barrier
if (birdY > 0.6) {
return true;
}
// Top barrier (size 200) - large barrier
if (birdY < -0.2) {
return true;
}
}

// Check collision with second barrier
if (barrierx2 >= -0.15 && barrierx2 <= 0.15) {
// Bottom barrier (size 150) - large barrier
if (birdY > 0.0) {
return true;
}
// Top barrier (size 50) - small barrier
if (birdY < -0.6) {
return true;
}
}

return false;
}

@override
Expand All @@ -113,43 +151,43 @@ class _HomepageState extends State<Homepage> {
children: [
MyBird(birdY: birdY),
Container(
alignment: Alignment(0, -0.5),
alignment: const Alignment(0, -0.5),
child: Text(
isGameStarted ? '' : 'T A P T O P L A Y',
style: TextStyle(color: Colors.white),
style: const TextStyle(color: Colors.white),
),
),
if (isGameStarted)
Container(
alignment: Alignment(-0.8, -0.8),
alignment: const Alignment(-0.8, -0.8),
child: Text(
'Score: $score',
style: TextStyle(
style: const TextStyle(
color: Colors.white,
fontSize: 20,
fontWeight: FontWeight.bold,
),
),
),
AnimatedContainer(
duration: Duration(milliseconds: 0),
duration: const Duration(milliseconds: 0),
alignment: Alignment(barrierx1, 1),
child: MyBarrier(size: 50.0),
child: const MyBarrier(size: 50.0),
),
AnimatedContainer(
duration: Duration(milliseconds: 0),
duration: const Duration(milliseconds: 0),
alignment: Alignment(barrierx1, -1),
child: MyBarrier(size: 200.0),
child: const MyBarrier(size: 200.0),
),
AnimatedContainer(
duration: Duration(milliseconds: 0),
duration: const Duration(milliseconds: 0),
alignment: Alignment(barrierx2, 1),
child: MyBarrier(size: 150.0),
child: const MyBarrier(size: 150.0),
),
AnimatedContainer(
duration: Duration(milliseconds: 0),
duration: const Duration(milliseconds: 0),
alignment: Alignment(barrierx2, -1),
child: MyBarrier(size: 50.0),
child: const MyBarrier(size: 50.0),
),
],
),
Expand Down
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