src/activities/house/mod.rs

@@ -3,7 +3,7 @@ mod grid;
 mod player;
 mod room;
 
-use comfy::{main_camera_mut, random_i32, vec2, EngineContext};
+use comfy::{main_camera_mut, random_i32, vec2, EngineContext, RandomRange as _};
 use grid::Grid;
 use log::error;
 use player::Player;
@@ -18,7 +18,12 @@ pub struct HouseState {
 	rooms: Vec<Room>,
 	//grid: Grid,
 	player: Player,
-	human_layer: bool //Human, magnetic, electric
+	human_layer: bool, //Human, magnetic, electric
+
+	/// The energy level remaining in the house. Should decrease by itself, and much
+	/// faster when inhabited by the ghost.
+	pub charge: f32,
+	pub max_charge: f32
 }
 
 impl HouseState {
@@ -31,12 +36,16 @@ impl HouseState {
 		}
 
 		let player = Player::new(rooms.first().unwrap());
+		let max_charge = f32::gen_range(2_000.0, 5_000.0);
 		HouseState {
 			current_room_id: 0,
 			room_count,
 			rooms,
 			player,
-			human_layer: false
+			human_layer: false,
+			// TODO this should be lower depending on the time elapsed
+			charge: max_charge,
+			max_charge
 		}
 	}
 }

src/activities/house/room.rs

@@ -1,7 +1,8 @@
 use super::{furniture::Furniture, grid::Grid};
 use crate::game;
 use comfy::{
-	draw_rect, draw_rect_outline, draw_sprite, error, random_i32, vec2, EngineContext, HashSet, Index, RandomRange as _, Vec2, GREEN, PURPLE, RED, WHITE
+	draw_rect, draw_rect_outline, draw_sprite, error, random_i32, vec2, EngineContext,
+	HashSet, Index, RandomRange as _, Vec2, GREEN, PURPLE, RED, WHITE
 };
 use indexmap::IndexSet;
 
@@ -88,7 +89,10 @@ impl Room {
 			empty_spots.swap_remove_index(random_idx)
 		}
 
-		fn random_empty_spot_size(empty_spots: &mut IndexSet<u8>, size: u8) -> Option<u8> {
+		fn random_empty_spot_size(
+			empty_spots: &mut IndexSet<u8>,
+			size: u8
+		) -> Option<u8> {
 			let mut empty_spots_size = IndexSet::<u8>::new();
 
 			for &index in empty_spots.iter() {
@@ -296,7 +300,6 @@ impl Room {
 							z: 0
 						});
 					}
-					
 				}
 
 				if let Some(pos) = random_empty_spot(&mut empty_spots) {
@@ -316,7 +319,6 @@ impl Room {
 						z: 0
 					});
 				}
-				
 			},
 
 			_ => {}

src/activities/overworld/mod.rs

@@ -1,4 +1,8 @@
-use crate::{activities::Activity, game::ZLayer, State};
+use crate::{
+	activities::Activity,
+	game::{ZLayer, GHOST_DISCHARGE_RATE, GHOST_DISCHARGE_RATE_MOVEMENT},
+	State
+};
 use comfy::{
 	delta, draw_circle, draw_rect_outline, draw_sprite, error, info, is_key_down,
 	main_camera_mut, EngineContext, IVec2, KeyCode, Vec2, RED, WHITE
@@ -177,9 +181,9 @@ pub fn update(state: &mut State, ctx: &mut EngineContext<'_>) {
 	// energie lost
 	{
 		let ghost = &mut state.ghost;
-		ghost.charge -= 70.0 * ctx.delta;
+		ghost.charge -= GHOST_DISCHARGE_RATE * ctx.delta;
 		if ghost.overworld_movement_pending != Vec2::ZERO {
-			ghost.charge -= 70.0 * ctx.delta;
+			ghost.charge -= GHOST_DISCHARGE_RATE_MOVEMENT * ctx.delta;
 		}
 	}
 

src/game.rs

@@ -107,12 +107,53 @@ pub fn setup(_state: &mut State, ctx: &mut EngineContext<'_>) {
 	//house::setup(state, ctx);
 }
 
-pub fn update(state: &mut State, engine: &mut EngineContext<'_>) {
-	state.score += engine.delta * 10.0;
+/// The amount of energy a ghost consumes idle.
+pub const GHOST_DISCHARGE_RATE: f32 = 70.0;
+/// The amount of energy additionally consumed by a moving ghost.
+pub const GHOST_DISCHARGE_RATE_MOVEMENT: f32 = 70.0;
+/// The amount of energy a house consumes idle.
+pub const HOUSE_DISCHARGE_RATE: f32 = 30.0;
+/// The amount of energy a ghost can charge when inside a house.
+pub const GHOST_CHARGE_RATE: f32 = 200.0;
+
+pub fn update(state: &mut State, ctx: &mut EngineContext<'_>) {
+	// Update the score. It's based on time.
+	state.score += ctx.delta * 10.0;
+
+	// Update the currently active activity.
 	match state.activity {
-		Activity::House(_) => house::update(state, engine),
-		Activity::Overworld => overworld::update(state, engine)
+		Activity::House(_) => house::update(state, ctx),
+		Activity::Overworld => overworld::update(state, ctx)
 	}
+
+	// We update the charge of houses here - the charge will always decrease, even if the
+	// house is not the current activity.
+	for (house_pos, house) in &mut state.houses {
+		house.charge -= ctx.delta * HOUSE_DISCHARGE_RATE;
+
+		match state.activity {
+			Activity::House(pos) if *house_pos == pos => {
+				// The ghost is currently inside the house. Increase its discarge rate.
+				house.charge -= ctx.delta * GHOST_DISCHARGE_RATE;
+				if house.charge < 0.0 {
+					state.ghost.charge += house.charge;
+					house.charge = 0.0;
+				}
+
+				// And possibly also charge the ghost when inside a house.
+				if state.ghost.charge < state.ghost.max_charge {
+					let charge_transfer = (ctx.delta * GHOST_CHARGE_RATE)
+						.min(state.ghost.max_charge - state.ghost.charge)
+						.min(house.charge);
+					state.ghost.charge += charge_transfer;
+					house.charge -= charge_transfer;
+				}
+			},
+			_ => {}
+		}
+	}
+
+	// Make sure the ghost's charge never drops below 0.
 	state.ghost.charge = state.ghost.charge.max(0.0);
 }
 

src/ui.rs

@@ -1,41 +1,61 @@
 use crate::{game::ZLayer, State};
 use comfy::{
 	draw_rect, draw_rect_outline, egui, screen_height, screen_to_world, screen_width,
-	EngineContext, Vec2, BLACK, BLUE, RED, WHITE
+	vec2, Color, EngineContext, Vec2, BLACK, BLUE, PURPLE, RED, WHITE
 };
 use egui::widget_text::RichText;
 
-pub fn draw_batterie(state: &State, _engine: &EngineContext<'_>) {
 // seperate fill state into smaller section for better readability
-	let section_count = 5;
-	let mut start_positon = screen_to_world(Vec2::new(screen_width(), screen_height()));
+const BATTERY_SECTION_COUNT: u8 = 5;
+const BATTERY_SECTION_WIDTH: f32 = 1.0;
+const BATTERY_SECTION_HEIGHT: f32 = 0.5;
+
+fn draw_battery(mut start_position: Vec2, charge: f32, max_charge: f32, color: Color) {
 	// section size in world codinates
-	let section_size = Vec2::new(0.5, 0.25);
-	start_positon.x -= 0.5 * section_size.x + 0.5 * section_size.y;
-	start_positon.y += 0.5 * section_size.y + 0.5 * section_size.y;
+	let section_size = vec2(BATTERY_SECTION_WIDTH, BATTERY_SECTION_HEIGHT);
+	start_position.x -= 0.5 * section_size.x + 0.5 * section_size.y;
+	start_position.y += 0.5 * section_size.y + 0.5 * section_size.y;
 	// draw fill level
 	{
-		let ghost = &state.ghost;
-		let percent = ghost.charge / ghost.max_charge;
+		let percent = charge / max_charge;
 		let mut size = section_size;
-		size.y = section_size.y * section_count as f32;
-		let mut position = start_positon;
+		size.y = section_size.y * BATTERY_SECTION_COUNT as f32;
+		let mut position = start_position;
 		position.y += 0.5 * -section_size.y + 0.5 * size.y;
 		draw_rect(position, size, BLACK, ZLayer::UI.into());
 		size.y *= percent;
-		let mut position = start_positon;
+		let mut position = start_position;
 		position.y += 0.5 * -section_size.y + 0.5 * size.y;
 		draw_rect(position, size, BLUE, ZLayer::UI + 1);
 	}
 	// draw sections
-	for i in 0 .. section_count {
-		let mut position = start_positon;
+	for i in 0 .. BATTERY_SECTION_COUNT {
+		let mut position = start_position;
 		position.y += i as f32 * section_size.y;
-		draw_rect_outline(position, section_size, 0.1, RED, ZLayer::UI + 2);
+		draw_rect_outline(position, section_size, 0.1, color, ZLayer::UI + 2);
 	}
 }
 
-pub fn draw_highscore(state: &State, _engine: &EngineContext<'_>) {
+pub fn draw_ghost_battery(state: &State) {
+	let start_position = screen_to_world(Vec2::new(screen_width(), screen_height()));
+	draw_battery(
+		start_position,
+		state.ghost.charge,
+		state.ghost.max_charge,
+		RED
+	);
+}
+
+pub fn draw_house_battery(state: &State) {
+	let Some(house) = state.house() else {
+		return;
+	};
+	let mut start_position = screen_to_world(Vec2::new(screen_width(), screen_height()));
+	start_position.x -= 2.0 * BATTERY_SECTION_WIDTH;
+	draw_battery(start_position, house.charge, house.max_charge, PURPLE)
+}
+
+pub fn draw_highscore(state: &State) {
 	egui::Area::new("score")
 		.anchor(egui::Align2::RIGHT_TOP, egui::vec2(0.0, 0.0))
 		.show(egui(), |ui| {
@@ -49,7 +69,8 @@ pub fn draw_highscore(state: &State, _engine: &EngineContext<'_>) {
 		});
 }
 
-pub fn draw(state: &State, engine: &EngineContext<'_>) {
-	draw_batterie(state, engine);
-	draw_highscore(state, engine);
+pub fn draw(state: &State, _ctx: &EngineContext<'_>) {
+	draw_ghost_battery(state);
+	draw_house_battery(state);
+	draw_highscore(state);
 }