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hexagon_generation.rs
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hexagon_generation.rs
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use bevy::{ecs::system::Resource, prelude::*};
use bevy_ecs_tilemap::prelude::*;
mod helpers;
use helpers::camera::movement as camera_movement;
// Press SPACE to change map type. Hover over a tile to highlight its label (red) and those of its
// neighbors (blue). Press and hold one of keys 0-5 to mark the neighbor in that direction (green).
// You can increase the MAP_SIDE_LENGTH, in order to test larger maps but just make sure that you run
// in release mode (`cargo run --release --example hexagon_generation`) otherwise things might be too
// slow.
const MAP_SIDE_LENGTH: u32 = 8;
const TILE_SIZE_HEX_ROW: TilemapTileSize = TilemapTileSize { x: 50.0, y: 58.0 };
const TILE_SIZE_HEX_COL: TilemapTileSize = TilemapTileSize { x: 58.0, y: 50.0 };
const GRID_SIZE_HEX_ROW: TilemapGridSize = TilemapGridSize { x: 50.0, y: 58.0 };
const GRID_SIZE_HEX_COL: TilemapGridSize = TilemapGridSize { x: 58.0, y: 50.0 };
#[derive(Deref, Resource)]
pub struct TileHandleHexRow(Handle<Image>);
#[derive(Deref, Resource)]
pub struct TileHandleHexCol(Handle<Image>);
#[derive(Deref, Resource)]
pub struct TileHandleSquare(Handle<Image>);
#[derive(Deref, Resource)]
pub struct TileHandleIso(Handle<Image>);
#[derive(Deref, Resource)]
pub struct FontHandle(Handle<Font>);
impl FromWorld for TileHandleHexCol {
fn from_world(world: &mut World) -> Self {
let asset_server = world.resource::<AssetServer>();
Self(asset_server.load("bw-tile-hex-col.png"))
}
}
impl FromWorld for TileHandleHexRow {
fn from_world(world: &mut World) -> Self {
let asset_server = world.resource::<AssetServer>();
Self(asset_server.load("bw-tile-hex-row.png"))
}
}
impl FromWorld for FontHandle {
fn from_world(world: &mut World) -> Self {
let asset_server = world.resource::<AssetServer>();
Self(asset_server.load("fonts/FiraSans-Bold.ttf"))
}
}
// Generates the initial tilemap, which is a square grid.
fn spawn_tilemap(mut commands: Commands, tile_handle_hex_row: Res<TileHandleHexRow>) {
commands.spawn(Camera2dBundle::default());
let map_size = TilemapSize {
x: MAP_SIDE_LENGTH,
y: MAP_SIDE_LENGTH,
};
let mut tile_storage = TileStorage::empty(map_size);
let tilemap_entity = commands.spawn_empty().id();
let tilemap_id = TilemapId(tilemap_entity);
let hex_coord_system = HexCoordSystem::Row;
fill_tilemap_hexagon(
TileTextureIndex(0),
TilePos {
x: MAP_SIDE_LENGTH / 2,
y: MAP_SIDE_LENGTH / 2,
},
MAP_SIDE_LENGTH / 2,
hex_coord_system,
tilemap_id,
&mut commands,
&mut tile_storage,
);
let tile_size = TILE_SIZE_HEX_ROW;
let grid_size = GRID_SIZE_HEX_ROW;
let map_type = TilemapType::Hexagon(hex_coord_system);
commands.entity(tilemap_entity).insert(TilemapBundle {
grid_size,
size: map_size,
storage: tile_storage,
texture: TilemapTexture::Single(tile_handle_hex_row.clone()),
tile_size,
map_type,
transform: get_tilemap_center_transform(&map_size, &grid_size, &map_type, 0.0),
..Default::default()
});
}
#[derive(Component)]
pub struct MapTypeLabel;
// Generates the map type label: e.g. `Square { diagonal_neighbors: false }`
fn spawn_map_type_label(
mut commands: Commands,
font_handle: Res<FontHandle>,
windows: Query<&Window>,
map_type_q: Query<&TilemapType>,
) {
let text_style = TextStyle {
font: font_handle.clone(),
font_size: 20.0,
color: Color::BLACK,
};
let text_alignment = TextAlignment::Center;
for window in windows.iter() {
for map_type in map_type_q.iter() {
// Place the map type label somewhere in the top left side of the screen
let transform = Transform {
translation: Vec2::new(-0.5 * window.width() / 2.0, 0.8 * window.height() / 2.0)
.extend(1.0),
..Default::default()
};
commands.spawn((
Text2dBundle {
text: Text::from_section(format!("{map_type:?}"), text_style.clone())
.with_alignment(text_alignment),
transform,
..default()
},
MapTypeLabel,
));
}
}
}
// Swaps the map type, when user presses SPACE
#[allow(clippy::too_many_arguments)]
fn swap_map_type(
mut commands: Commands,
mut tilemap_query: Query<(
Entity,
&mut Transform,
&TilemapSize,
&mut TilemapType,
&mut TilemapGridSize,
&mut TilemapTexture,
&mut TilemapTileSize,
&mut TileStorage,
)>,
keyboard_input: Res<Input<KeyCode>>,
mut map_type_label_q: Query<&mut Text, With<MapTypeLabel>>,
tile_handle_hex_row: Res<TileHandleHexRow>,
tile_handle_hex_col: Res<TileHandleHexCol>,
) {
if keyboard_input.just_pressed(KeyCode::Space) {
for (
map_id,
mut map_transform,
map_size,
mut map_type,
mut grid_size,
mut map_texture,
mut tile_size,
mut tile_storage,
) in tilemap_query.iter_mut()
{
// Remove all previously spawned tiles.
for possible_entity in tile_storage.iter_mut() {
// see documentation for take to understand how it works:
// https://doc.rust-lang.org/std/option/enum.Option.html#method.take
if let Some(entity) = possible_entity.take() {
commands.entity(entity).despawn_recursive();
}
}
let new_coord_sys = match map_type.as_ref() {
TilemapType::Hexagon(HexCoordSystem::Row) => HexCoordSystem::Column,
TilemapType::Hexagon(HexCoordSystem::Column) => HexCoordSystem::Row,
_ => unreachable!(),
};
*map_type = TilemapType::Hexagon(new_coord_sys);
if new_coord_sys == HexCoordSystem::Column {
*map_texture = TilemapTexture::Single((*tile_handle_hex_col).clone());
*tile_size = TILE_SIZE_HEX_COL;
*grid_size = GRID_SIZE_HEX_COL;
} else if new_coord_sys == HexCoordSystem::Row {
*map_texture = TilemapTexture::Single((*tile_handle_hex_row).clone());
*tile_size = TILE_SIZE_HEX_ROW;
*grid_size = GRID_SIZE_HEX_ROW;
}
*map_transform = get_tilemap_center_transform(map_size, &grid_size, &map_type, 0.0);
// Re-generate tiles in a hexagonal pattern.
fill_tilemap_hexagon(
TileTextureIndex(0),
TilePos {
x: MAP_SIDE_LENGTH / 2,
y: MAP_SIDE_LENGTH / 2,
},
MAP_SIDE_LENGTH / 2,
new_coord_sys,
TilemapId(map_id),
&mut commands,
&mut tile_storage,
);
for mut label_text in map_type_label_q.iter_mut() {
label_text.sections[0].value = format!("{:?}", map_type.as_ref());
}
}
}
}
fn main() {
App::new()
.add_plugins(
DefaultPlugins
.set(WindowPlugin {
primary_window: Some(Window {
title: String::from("Generating a hexagonal hex map"),
..Default::default()
}),
..default()
})
.set(ImagePlugin::default_nearest()),
)
.add_plugins(TilemapPlugin)
.init_resource::<TileHandleHexCol>()
.init_resource::<TileHandleHexRow>()
.init_resource::<FontHandle>()
.add_systems(
Startup,
(spawn_tilemap, apply_deferred, spawn_map_type_label).chain(),
)
.add_systems(Update, camera_movement)
.add_systems(Update, swap_map_type)
.run();
}