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Get ball moving slowly, no collision yet #1

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Sep 26, 2023
Merged

Get ball moving slowly, no collision yet #1

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33 changes: 26 additions & 7 deletions src/main.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,8 @@ const BALL_START_X: f32 = 32.5;
const BALL_START_Y: f32 = -270.;
const BALL_SIZE: f32 = 12.5;
const BALL_COLOR: Color = Color::PURPLE;
const BALL_SPEED: f32 = 4.0;
const INITIAL_BALL_DIRECTION: Vec2 = Vec2::new(0.5, -0.5);
const PADDLE_START_X: f32 = 32.5;
const PADDLE_START_Y: f32 = -300.;
const PADDLE_HEIGHT: f32 = 20.;
Expand All @@ -34,12 +36,18 @@ const RIGHT_BOUND_PADDLE: f32 = RIGHT_WALL - WALL_SIZE - (PADDLE_WIDTH / 2.);
#[derive(Component)]
struct Paddle;

#[derive(Component)]
struct Ball;

#[derive(Component, Deref, DerefMut)]
struct Velocity(Vec2);

fn main() {
App::new()
.add_plugins(DefaultPlugins)
.insert_resource(ClearColor(BACKGROUND_COLOR))
.add_systems(Startup, setup)
.add_systems(FixedUpdate, move_paddle)
.add_systems(FixedUpdate, (move_paddle, apply_velocity))
.add_systems(Update, bevy::window::close_on_esc)
.run();
}
Expand Down Expand Up @@ -120,12 +128,16 @@ fn setup(
}

// Draw Ball
commands.spawn(MaterialMesh2dBundle {
mesh: meshes.add(shape::Circle::new(BALL_SIZE).into()).into(),
material: materials.add(ColorMaterial::from(BALL_COLOR)),
transform: Transform::from_translation(Vec3::new(BALL_START_X, BALL_START_Y, 0.)),
..default()
});
commands.spawn((
MaterialMesh2dBundle {
mesh: meshes.add(shape::Circle::new(BALL_SIZE).into()).into(),
material: materials.add(ColorMaterial::from(BALL_COLOR)),
transform: Transform::from_translation(Vec3::new(BALL_START_X, BALL_START_Y, 0.)),
..default()
},
Ball,
Velocity(INITIAL_BALL_DIRECTION.normalize() * BALL_SPEED),
));

// Draw Paddle
commands.spawn((
Expand Down Expand Up @@ -159,3 +171,10 @@ fn move_paddle(
paddle_transform.translation.x =
new_paddle_position.clamp(LEFT_BOUND_PADDLE, RIGHT_BOUND_PADDLE);
}

fn apply_velocity(mut query: Query<(&mut Transform, &Velocity)>, time_step: Res<FixedTime>) {
for (mut transform, velocity) in &mut query {
transform.translation.x += velocity.x * time_step.period.as_secs_f32();
transform.translation.y += velocity.y * time_step.period.as_secs_f32();
}
}
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