derek/bevy-snake
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Add game over system

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This commit is contained in:
Derek Christ
2022-08-07 00:23:14 +02:00
parent 967887456f
commit fe5f91966f
3 changed files with 32 additions and 11 deletions
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2
src/grid.rs
View File

@@ -1,7 +1,7 @@
use bevy::prelude::*;
use std::ops::{Add, AddAssign};
type GridType = i16;
pub type GridType = i16;
pub const GRID_SIZE: GridType = 21;
pub const GRID_SEGMENT_SIZE: f32 = 20.;

15
src/main.rs
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@@ -41,12 +41,15 @@ fn main() {
}
fn setup_system(mut commands: Commands) {
let vertical_height = GRID_SIZE as f32 * GRID_SEGMENT_SIZE * 1.2;
let grid_dimensions = GRID_SIZE as f32 * GRID_SEGMENT_SIZE * 1.2;
commands
.spawn_bundle(Camera2dBundle {
projection: OrthographicProjection {
scaling_mode: ScalingMode::FixedVertical(vertical_height),
scaling_mode: ScalingMode::Auto {
min_width: grid_dimensions,
min_height: grid_dimensions,
},
..Default::default()
},
..Default::default()
@@ -66,16 +69,16 @@ fn camera_move_system(
let mut delta = Vec3::ZERO;
if keypress.pressed(KeyCode::Up) {
delta += Vec3::new(0., 1., 0.);
delta += Vec3::new(0., 10., 0.);
}
if keypress.pressed(KeyCode::Down) {
delta += Vec3::new(0., -1., 0.);
delta += Vec3::new(0., -10., 0.);
}
if keypress.pressed(KeyCode::Left) {
delta += Vec3::new(-1., 0., 0.);
delta += Vec3::new(-10., 0., 0.);
}
if keypress.pressed(KeyCode::Right) {
delta += Vec3::new(1., 0., 0.);
delta += Vec3::new(10., 0., 0.);
}
delta

26
src/snake.rs
View File

@@ -1,5 +1,5 @@
use crate::{
grid::{GridCoordinate, GRID_SEGMENT_SIZE, GRID_SIZE},
grid::{GridCoordinate, GridType, GRID_SEGMENT_SIZE, GRID_SIZE},
AppState,
};
use bevy::prelude::*;
@@ -28,9 +28,10 @@ impl Plugin for SnakePlugin {
.with_stage(fixed_time_systems0)
.with_stage(fixed_time_systems1),
)
.add_system(game_over_system.run_in_state(AppState::InGame))
.add_system(add_direction_system.run_in_state(AppState::Begin))
.add_system(direction_system.run_in_state(AppState::InGame))
.add_system(grid_transform_system)
.add_system(grid_transform_system.run_in_state(AppState::InGame))
.add_system(add_tail_system);
}
}
@@ -82,7 +83,7 @@ fn create_snake_segment(commands: &mut Commands, grid_position: GridCoordinate)
.spawn_bundle(SpriteBundle {
sprite: Sprite {
color: Color::RED,
custom_size: Some(Vec2::splat(GRID_SEGMENT_SIZE)*0.9),
custom_size: Some(Vec2::splat(GRID_SEGMENT_SIZE) * 0.9),
..Default::default()
},
transform: grid_position.into(),
@@ -129,7 +130,7 @@ fn add_tail_system(
mut snake_query: Query<(Entity, &mut SnakeSegments)>,
) {
if keypress.just_pressed(KeyCode::Space) {
let segment = create_snake_segment(&mut commands, GridCoordinate::splat(-1));
let segment = create_snake_segment(&mut commands, GridCoordinate::splat(GridType::MIN / 2));
let (snake, mut snake_segments) = snake_query.single_mut();
snake_segments.0.push(segment);
commands.entity(snake).add_child(segment);
@@ -186,3 +187,20 @@ fn segments_movement_system(
}
}
}
fn game_over_system(
mut commands: Commands,
query: Query<(&GridCoordinate, &Direction), With<SnakeHead>>,
) {
const HIGH_BARRIER: GridType = GRID_SIZE - 1;
match query.single() {
(GridCoordinate(_, 0), Direction::Down)
| (GridCoordinate(_, HIGH_BARRIER), Direction::Up)
| (GridCoordinate(0, _), Direction::Left)
| (GridCoordinate(HIGH_BARRIER, _), Direction::Right) => {
commands.insert_resource(NextState(AppState::End))
}
_ => (),
};
}