Your First Flutter Flame Game

Mar 6 2024 · Dart 3, Flutter 3.10.1, Android Studio 2021.3.1 or higher, Visual Studo Code 1.7.4 or higher

Part 2: Effects & User Input

10. Add Bullet Component

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Sometimes, instead of loading a sprite, it might be simpler to draw it in a canvas.

Demo

Bullet

Start by defining Bullet in the same way as the other components.

import 'package:flame/components.dart';

class Bullet extends PositionComponent {
}

static const double bulletWidth = 12;
static const double bulletHeight = 4;

static final Vector2 bulletSize = Vector2(bulletWidth, bulletHeight);

static const bulletRect = Rect.fromLTWH(
  0,
  0,
  bulletWidth,
  bulletHeight,
);

final Vector2 velocity = Vector2.zero();
double directionAngle;

Bullet({
  required this.directionAngle,
  super.position,
}) : super(size: Bullet.bulletSize);

@override
FutureOr<void> onLoad() {
  angle = directionAngle;

  return super.onLoad();
}

@override
void render(Canvas canvas) {
}

final _bulletPaint = Paint()

..style = PaintingStyle.fill
..color = const Color(0xFFFFFFFF);

canvas.drawRect(Bullet.bulletRect, _bulletPaint);

@override
void update(double dt) {
  velocity.x = GameConstants.bulletSpeed * cos(directionAngle);
  velocity.y = GameConstants.bulletSpeed * sin(directionAngle);
  position += velocity * dt;

  super.update(dt);
}

    if (position.x > GameConstants.cameraWidth || position.x < 0) {
      removeFromParent();
    }
    if (position.y > GameConstants.cameraHeight || position.y < 0) {
      removeFromParent();
    }

MeteormaniaGame

It’s time to add Bullet to the game world.

bool _isShooting = false;

Spaceship? _spaceship;

_spaceship = Spaceship()
  ..anchor = Anchor.center
  ..position = Vector2(
    GameConstants.cameraWidth / 2,
    GameConstants.cameraHeight / 2,
  );

_world.add(_spaceship!);

void shootBullet() {
}

if (!_isShooting && !manager.isGameOver) {
}

_isShooting = true;

_world.add(
  Bullet(directionAngle: _spaceship!.angle + 3 * pi / 2)
    ..anchor = Anchor.center
    ..position = _spaceship!.position,
);

_isShooting = false;

shootBullet();