Fixed radar

Cargo.toml

@@ -74,10 +74,4 @@ lazy_static = "1.4.0"
 clap = { version = "4.4.18", features = ["derive"] }
 log = "0.4.20"
 log4rs = { version = "1.2.0", features = ["console_appender"] }
-rhai = { version = "1.17.0", features = [
-	"f32_float",
-	"only_i32",
-	"metadata",
-	"no_custom_syntax",
-	"no_closure",
-] }
+rhai = { version = "1.17.1", features = ["f32_float", "no_custom_syntax"] }

content/ui/flying.rhai

@@ -32,6 +32,46 @@ fn init(state) {
 			Anchor::NorthEast
 		)
 	);
+
+
+
+
+
+	let radar_size = 150.0;
+	let radar_range = 4000.0;
+
+	add_sprite(
+		"radar",
+		"ui::radar",
+		Rect(
+			5.0, -5.0,
+			radar_size, radar_size,
+			Anchor::NorthWest,
+			Anchor::NorthWest
+		)
+	);
+
+	let init_pos = Rect(
+		(radar_size / 2.0 + 5),
+		(radar_size / -2.0 - 5),
+		3.5, 3.5,
+		Anchor::Center,
+		Anchor::NorthWest
+	);
+
+	add_sprite("radar.frame.ne", "ui::radarframe", init_pos);
+	add_sprite("radar.frame.se", "ui::radarframe", init_pos);
+	add_sprite("radar.frame.sw", "ui::radarframe", init_pos);
+	add_sprite("radar.frame.nw", "ui::radarframe", init_pos);
+	sprite_set_angle("radar.frame.se", 90.0);
+	sprite_set_angle("radar.frame.sw", 180.0);
+	sprite_set_angle("radar.frame.nw", 270.0);
+	sprite_set_color("radar.frame.ne", Color(0.3, 0.3, 0.3, 1.0));
+	sprite_set_color("radar.frame.se", Color(0.3, 0.3, 0.3, 1.0));
+	sprite_set_color("radar.frame.sw", Color(0.3, 0.3, 0.3, 1.0));
+	sprite_set_color("radar.frame.nw", Color(0.3, 0.3, 0.3, 1.0));
+
+	add_sprite("radar.arrow", "ui::centerarrow", init_pos);
 }
 
 fn event(state, event) {
@@ -53,4 +93,209 @@ fn step(state) {
 		state.player_ship().get_hull()
 		/ state.player_ship().get_total_hull()
 	);
+
+
+	// TODO: share variables with init();
+	let radar_size = 150.0;
+	let radar_range = 4000.0;
+	let hide_range = 0.85;
+	let shrink_distance = 20.0;
+	let p_pos = state.player_ship().get_pos();
+
+	// Radar arrow
+	{
+		let q = Vector(0.0, 0.0) - state.player_ship().get_pos();
+		let m = q.norm();
+		let angle = Vector(1.0, 0.0).clockwise_angle(q);
+		let position = Vector(5.0 + (radar_size / 2.0), -5.0 - (radar_size / 2.0));
+		let rot = Vector(0.915 * (radar_size / 2.0), 0.0);
+		let pos = position + rot.rotate(angle);
+		sprite_set_rect("radar.arrow",
+			Rect(
+				pos.x(), pos.y(),
+				5.0, 5.0,
+				Anchor::Center,
+				Anchor::NorthWest
+			)
+		);
+		sprite_set_angle("radar.arrow", angle - 90.0);
+		sprite_set_color(
+			"radar.arrow",
+			Color(
+				1.0, 1.0, 1.0,
+				clamp((m - 200.0) /400.0, 0.0, 1.0)
+			)
+		)
+	}
+
+	// Ships
+	{
+		for s in state.ships() {
+			let uid = s.get_uid();
+			let sprite_name = `radar.ship.${uid}`;
+
+			if (
+				!s.is_some() ||
+				s.is_dead() ||
+				s.is_landed()
+			){
+				if sprite_exists(sprite_name) {
+					remove_sprite(sprite_name);
+				}
+				continue;
+			}
+			
+			let color = Color(0.2, 0.2, 0.2, 1.0);
+			if s.is_flying() {
+				color = s.get_faction_color()
+			}
+			
+
+			let size_init = s.get_size() * (1.0 / 50.0);
+			let pos = s.get_pos();
+			let d = (pos - p_pos) / radar_range;
+			let m = d.norm() + (size_init / (2.0 * radar_size));
+			if m < hide_range {
+				let size = (hide_range - m) * size_init * shrink_distance;
+				if size > size_init {
+					size = size_init;
+				}
+				if size < 1.0 {
+					if sprite_exists(sprite_name) {
+						remove_sprite(sprite_name);
+					}
+					continue;
+				}
+
+				let pos = Vector(radar_size / 2.0 + 5.0, radar_size / -2.0 - 5.0);
+				pos = pos + (d * radar_size / 2.0);
+
+				if !sprite_exists(sprite_name) {
+					add_sprite(
+						sprite_name,
+						"ui::shipblip",
+						Rect(
+							pos.x(), pos.y(),
+							size, size,
+							Anchor::Center,
+							Anchor::NorthWest
+						)
+					);
+				} else {
+					sprite_set_rect(
+						sprite_name,
+						Rect(
+							pos.x(), pos.y(),
+							size, size,
+							Anchor::Center,
+							Anchor::NorthWest
+						)
+					);
+				}
+				sprite_set_color(sprite_name, color);
+			}
+		}
+	}
+
+	// System objects
+	{
+		for o in state.objects() {
+			let sprite_name = `radar.object.${o.get_label()}`;
+
+			if !o.is_some() {
+				if sprite_exists(sprite_name) {
+					remove_sprite(sprite_name);
+				}
+				continue;
+			}
+
+			let size_init = (o.get_size() / o.get_pos_z()) / (radar_range * (1.0 / 300.0));
+			let pos = o.get_pos();
+			let d = (pos - p_pos) / radar_range;
+			let m = d.norm() + (size_init / (2.0 * radar_size));
+			if m < hide_range {
+				let size = (hide_range - m) * size_init * shrink_distance;
+				if size > size_init {
+					size = size_init;
+				}
+				if size < 1.0 {
+					// Don't draw tiny sprites, they flicker
+					if sprite_exists(sprite_name) {
+						remove_sprite(sprite_name);
+					}
+					continue;
+				}
+
+				let pos = (
+					Vector(radar_size / 2.0 + 5.0, radar_size / -2.0 - 5.0)
+					+ (d * radar_size / 2.0)
+				);
+
+				if !sprite_exists(sprite_name) {
+					add_sprite(
+						sprite_name,
+						"ui::planetblip",
+						Rect(
+							pos.x(), pos.y(),
+							size, size,
+							Anchor::Center,
+							Anchor::NorthWest
+						)
+					);
+				} else {
+					sprite_set_rect(
+						sprite_name,
+						Rect(
+							pos.x(), pos.y(),
+							size, size,
+							Anchor::Center,
+							Anchor::NorthWest
+						)
+					);
+				}
+			}
+		}
+	}
+
+	// Window frame
+	{
+		let dx = (((state.camera_zoom() / 2.0) * state.window_aspect()) / radar_range) * (radar_size / 2.0);
+		let dy = ((state.camera_zoom() / 2.0) / radar_range) * (radar_size / 2.0);
+		sprite_set_rect("radar.frame.ne",
+			Rect(
+				(radar_size / 2.0 + 5) - dx,
+				(radar_size / -2.0 - 5) + dy,
+				3.5, 3.5,
+				Anchor::Center,
+				Anchor::NorthWest
+			)
+		);
+		sprite_set_rect("radar.frame.se",
+			Rect(
+				(radar_size / 2.0 + 5) - dx,
+				(radar_size / -2.0 - 5) - dy,
+				3.5, 3.5,
+				Anchor::Center,
+				Anchor::NorthWest
+			)
+		);
+		sprite_set_rect("radar.frame.sw",
+			Rect(
+				(radar_size / 2.0 + 5) + dx,
+				(radar_size / -2.0 - 5) - dy,
+				3.5, 3.5,
+				Anchor::Center,
+				Anchor::NorthWest
+			)
+		);
+		sprite_set_rect("radar.frame.nw",
+			Rect(
+				(radar_size / 2.0 + 5) + dx,
+				(radar_size / -2.0 - 5) + dy,
+				3.5, 3.5,
+				Anchor::Center,
+				Anchor::NorthWest
+			)
+		);
+			}
 }

crates/content/src/part/config.rs

@@ -6,7 +6,7 @@ pub(crate) mod syntax {
 	use anyhow::{bail, Context, Result};
 	use galactica_packer::SpriteAtlas;
 	use galactica_util::rhai_error_to_anyhow;
-	use rhai::Engine;
+	use rhai::{Engine, OptimizationLevel};
 	use serde::Deserialize;
 	use std::{
 		collections::HashMap,
@@ -61,7 +61,9 @@ pub(crate) mod syntax {
 				}
 			};
 
-			let engine = Engine::new();
+			let mut engine = Engine::new_raw();
+			engine.set_optimization_level(OptimizationLevel::Full);
+			engine.set_max_expr_depths(0, 0);
 			let mut ui_scenes = HashMap::new();
 			for (n, p) in self.ui_scene {
 				ui_scenes.insert(

crates/content/src/part/system.rs

@@ -126,9 +126,12 @@ pub struct SystemObject {
 	/// If true, ships may land on this object
 	pub landable: bool,
 
-	/// The display name of this object
+	/// The pretty display name of this object
 	pub name: Option<String>,
 
+	/// The system-unique label of this object
+	pub label: String,
+
 	/// The description of this object (shown on landed ui)
 	pub desc: Option<String>,
 
@@ -259,6 +262,7 @@ impl crate::Build for System {
 				}
 
 				objects.push(SystemObject {
+					label: label.clone(),
 					sprite: sprite_handle,
 					image: image_handle,
 					pos: resolve_position(&system.object, &obj, cycle_detector)

crates/render/Cargo.toml

@@ -33,3 +33,4 @@ bytemuck = { workspace = true }
 glyphon = { workspace = true }
 log = { workspace = true }
 rhai = { workspace = true }
+rapier2d = { workspace = true }

crates/render/src/ui/api/color.rs

@@ -3,7 +3,7 @@ use rhai::{CustomType, TypeBuilder};
 
 #[derive(Debug, Clone)]
 pub struct Color {
-	pub val: Vector4<f32>,
+	val: Vector4<f32>,
 }
 
 impl Color {

crates/render/src/ui/api/config.rs

@@ -0,0 +1,28 @@
+use rhai::{CustomType, TypeBuilder};
+
+#[derive(Debug, Clone)]
+pub struct SceneConfig {
+	pub show_phys: bool,
+	pub show_starfield: bool,
+}
+
+impl SceneConfig {
+	pub fn new() -> Self {
+		Self {
+			show_phys: false,
+			show_starfield: false,
+		}
+	}
+}
+
+impl CustomType for SceneConfig {
+	fn build(mut builder: TypeBuilder<Self>) {
+		builder
+			.with_name("SceneConfig")
+			.with_fn("SceneConfig", Self::new)
+			.with_fn("show_phys", |s: &mut Self, x: bool| s.show_phys = x)
+			.with_fn("show_starfield", |s: &mut Self, x: bool| {
+				s.show_starfield = x
+			});
+	}
+}

crates/render/src/ui/api/mod.rs

@@ -3,12 +3,14 @@ mod color;
 mod event;
 mod rect;
 mod state;
+mod vector;
 
 pub use anchor::*;
 pub use color::*;
 pub use event::*;
 pub use rect::*;
 pub use state::*;
+pub use vector::*;
 
 use rhai::{exported_module, Engine};
 
@@ -17,6 +19,7 @@ pub fn register_into_engine(engine: &mut Engine) {
 		// Helpers
 		.build_type::<Rect>()
 		.build_type::<Color>()
+		.build_type::<UiVector>()
 		// State
 		.build_type::<State>()
 		.build_type::<ShipState>()

crates/render/src/ui/api/state.rs

@@ -1,13 +1,16 @@
 use galactica_content::{Ship, SystemObject, SystemObjectHandle};
 use galactica_system::{
-	data::{self, ShipData},
-	phys::PhysSimShipHandle,
+	data::{self},
+	phys::{objects::PhysShip, PhysSimShipHandle},
 };
+use galactica_util::to_degrees;
 use log::error;
-use rhai::{CustomType, TypeBuilder};
+use rapier2d::dynamics::RigidBody;
+use rhai::{Array, CustomType, Dynamic, ImmutableString, TypeBuilder};
 use std::sync::Arc;
 
-use crate::RenderInput;
+use super::{Color, UiVector};
+use crate::{RenderInput, RenderState};
 
 #[derive(Debug, Clone)]
 pub struct ShipState {
@@ -15,10 +18,6 @@ pub struct ShipState {
 	input: Arc<RenderInput>,
 }
 
-// TODO: remove this
-unsafe impl Send for ShipState {}
-unsafe impl Sync for ShipState {}
-
 impl ShipState {
 	fn get_content(&mut self) -> &Ship {
 		let ship = self
@@ -30,18 +29,27 @@ impl ShipState {
 		self.input.ct.get_ship(handle)
 	}
 
-	fn get_data(&mut self) -> &ShipData {
+	fn get_ship(&mut self) -> &PhysShip {
 		let ship = self
 			.input
 			.phys_img
 			.get_ship(self.ship.as_ref().unwrap())
 			.unwrap();
-		ship.ship.get_data()
+		&ship.ship
+	}
+
+	fn get_body(&mut self) -> &RigidBody {
+		let ship = self
+			.input
+			.phys_img
+			.get_ship(self.ship.as_ref().unwrap())
+			.unwrap();
+		&ship.rigidbody
 	}
 
 	fn landed_on(&mut self) -> SystemObjectState {
 		let input = self.input.clone();
-		match self.get_data().get_state() {
+		match self.get_ship().get_data().get_state() {
 			data::ShipState::Landed { target } => {
 				return SystemObjectState {
 					input,
@@ -63,31 +71,48 @@ impl CustomType for ShipState {
 		builder
 			.with_name("ShipState")
 			.with_fn("is_some", |s: &mut Self| s.ship.is_some())
-			.with_fn("is_dead", |s: &mut Self| s.get_data().get_state().is_dead())
+			.with_fn("is_dead", |s: &mut Self| {
+				s.get_ship().get_data().get_state().is_dead()
+			})
 			.with_fn("is_landed", |s: &mut Self| {
-				s.get_data().get_state().is_landed()
+				s.get_ship().get_data().get_state().is_landed()
 			})
 			.with_fn("is_landing", |s: &mut Self| {
-				s.get_data().get_state().is_landing()
+				s.get_ship().get_data().get_state().is_landing()
 			})
 			.with_fn("is_flying", |s: &mut Self| {
-				s.get_data().get_state().is_flying()
+				s.get_ship().get_data().get_state().is_flying()
 			})
 			.with_fn("is_unlanding", |s: &mut Self| {
-				s.get_data().get_state().is_unlanding()
+				s.get_ship().get_data().get_state().is_unlanding()
 			})
 			.with_fn("is_collapsing", |s: &mut Self| {
-				s.get_data().get_state().is_collapsing()
+				s.get_ship().get_data().get_state().is_collapsing()
 			})
 			.with_fn("name", |s: &mut Self| s.get_content().name.clone())
 			.with_fn("thumbnail", |s: &mut Self| s.get_content().thumb)
 			.with_fn("landed_on", |s: &mut Self| s.landed_on())
-			.with_fn("get_shields", |s: &mut Self| s.get_data().get_shields())
+			.with_fn("get_shields", |s: &mut Self| {
+				s.get_ship().get_data().get_shields()
+			})
 			.with_fn("get_total_shields", |s: &mut Self| {
-				s.get_data().get_outfits().get_total_shields()
+				s.get_ship().get_data().get_outfits().get_total_shields()
 			})
 			.with_fn("get_total_hull", |s: &mut Self| s.get_content().hull)
-			.with_fn("get_hull", |s: &mut Self| s.get_data().get_hull());
+			.with_fn("get_hull", |s: &mut Self| {
+				s.get_ship().get_data().get_hull()
+			})
+			.with_fn("get_size", |s: &mut Self| s.get_content().size)
+			.with_fn("get_uid", |s: &mut Self| format!("{}", s.get_ship().uid))
+			.with_fn("get_pos", |s: &mut Self| {
+				let t = s.get_body().translation();
+				UiVector::new(t.x, t.y)
+			})
+			.with_fn("get_faction_color", |s: &mut Self| {
+				let h = s.get_ship().get_data().get_faction();
+				let c = s.input.ct.get_faction(h).color;
+				Color::new(c[0], c[1], c[2], 1.0)
+			});
 	}
 }
 
@@ -97,10 +122,6 @@ pub struct SystemObjectState {
 	input: Arc<RenderInput>,
 }
 
-// TODO: remove this
-unsafe impl Send for SystemObjectState {}
-unsafe impl Sync for SystemObjectState {}
-
 impl SystemObjectState {
 	fn get_content(&mut self) -> &SystemObject {
 		self.input.ct.get_system_object(self.object.unwrap())
@@ -146,13 +167,30 @@ impl CustomType for SystemObjectState {
 					"".to_string()
 				}
 			})
-			.with_fn("is_some", |s: &mut Self| s.object.is_some());
+			.with_fn("is_some", |s: &mut Self| s.object.is_some())
+			.with_fn("==", |a: &mut Self, b: Self| a.object == b.object)
+			.with_fn("get_size", |s: &mut Self| s.get_content().size)
+			.with_fn("get_label", |s: &mut Self| {
+				ImmutableString::from(&s.get_content().label)
+			})
+			.with_fn("get_angle", |s: &mut Self| {
+				to_degrees(s.get_content().angle)
+			})
+			.with_fn("get_pos", |s: &mut Self| {
+				let t = s.get_content().pos;
+				UiVector::new(t.x, t.y)
+			})
+			.with_fn("get_pos_z", |s: &mut Self| {
+				let t = s.get_content().pos;
+				t.z
+			});
 	}
 }
 
 #[derive(Debug, Clone)]
 pub struct State {
 	input: Arc<RenderInput>,
+	window_aspect: f32,
 }
 
 // TODO: remove this
@@ -160,8 +198,11 @@ unsafe impl Send for State {}
 unsafe impl Sync for State {}
 
 impl State {
-	pub fn new(input: Arc<RenderInput>) -> Self {
-		Self { input }
+	pub fn new(state: &RenderState, input: Arc<RenderInput>) -> Self {
+		Self {
+			input,
+			window_aspect: state.window_aspect,
+		}
 	}
 
 	pub fn player_ship(&mut self) -> ShipState {
@@ -170,12 +211,39 @@ impl State {
 			ship: self.input.player.ship.map(|x| PhysSimShipHandle(x)),
 		}
 	}
+
+	pub fn ships(&mut self) -> Array {
+		let mut a = Array::new();
+		for s in self.input.phys_img.iter_ships() {
+			a.push(Dynamic::from(ShipState {
+				input: self.input.clone(),
+				ship: Some(PhysSimShipHandle(s.ship.collider)),
+			}));
+		}
+		return a;
+	}
+
+	pub fn objects(&mut self) -> Array {
+		let mut a = Array::new();
+		let s = self.input.current_system;
+		for o in &self.input.ct.get_system(s).objects {
+			a.push(Dynamic::from(SystemObjectState {
+				input: self.input.clone(),
+				object: Some(o.handle),
+			}));
+		}
+		return a;
+	}
 }
 
 impl CustomType for State {
 	fn build(mut builder: TypeBuilder<Self>) {
 		builder
 			.with_name("State")
-			.with_fn("player_ship", Self::player_ship);
+			.with_fn("player_ship", Self::player_ship)
+			.with_fn("ships", Self::ships)
+			.with_fn("objects", Self::objects)
+			.with_fn("window_aspect", |s: &mut Self| s.window_aspect)
+			.with_fn("camera_zoom", |s: &mut Self| s.input.camera_zoom);
 	}
 }

crates/render/src/ui/api/vector.rs

@@ -0,0 +1,47 @@
+use galactica_util::{clockwise_angle, to_degrees, to_radians};
+use nalgebra::{Rotation2, Vector2};
+use rhai::{CustomType, TypeBuilder};
+
+#[derive(Debug, Clone)]
+pub struct UiVector {
+	val: Vector2<f32>,
+}
+
+impl UiVector {
+	pub fn new(x: f32, y: f32) -> Self {
+		Self {
+			val: Vector2::new(x, y),
+		}
+	}
+
+	pub fn rotate(&mut self, angle: f32) -> Self {
+		return UiVector {
+			val: Rotation2::new(to_radians(angle)) * self.val,
+		};
+	}
+
+	pub fn clockwise_angle(&mut self, other: UiVector) -> f32 {
+		return to_degrees(clockwise_angle(&self.val, &other.val));
+	}
+}
+
+impl CustomType for UiVector {
+	fn build(mut builder: TypeBuilder<Self>) {
+		builder
+			.with_name("Vector")
+			.with_fn("Vector", Self::new)
+			.with_fn("rotate", Self::rotate)
+			.with_fn("clockwise_angle", Self::clockwise_angle)
+			.with_fn("+", |a: UiVector, b: UiVector| UiVector {
+				val: a.val + b.val,
+			})
+			.with_fn("-", |a: UiVector, b: UiVector| UiVector {
+				val: a.val - b.val,
+			})
+			.with_fn("/", |s: &mut Self, x: f32| UiVector { val: s.val / x })
+			.with_fn("*", |s: &mut Self, x: f32| UiVector { val: s.val * x })
+			.with_fn("x", |s: &mut Self| s.val.x)
+			.with_fn("y", |s: &mut Self| s.val.y)
+			.with_fn("norm", |s: &mut Self| s.val.magnitude());
+	}
+}

crates/render/src/ui/executor.rs

@@ -4,7 +4,10 @@ use galactica_system::phys::PhysSimShipHandle;
 use galactica_util::rhai_error_to_anyhow;
 use glyphon::{cosmic_text::Align, FamilyOwned, FontSystem, Style, Weight};
 use log::{debug, error};
-use rhai::{Dynamic, Engine, ImmutableString, Scope};
+use rhai::{
+	packages::{BasicArrayPackage, BasicStringPackage, LogicPackage, MoreStringPackage, Package},
+	Dynamic, Engine, ImmutableString, Scope,
+};
 use std::{cell::RefCell, num::NonZeroU32, rc::Rc, sync::Arc};
 
 use super::{
@@ -31,6 +34,18 @@ impl UiScriptExecutor {
 		let elements = Rc::new(RefCell::new(UiState::new(ct.clone(), state)));
 
 		let mut engine = Engine::new_raw();
+
+		// Required for array iteration
+		// We may need to add more packages here later.
+		engine.register_global_module(BasicArrayPackage::new().as_shared_module());
+		engine.register_global_module(LogicPackage::new().as_shared_module());
+		engine.register_global_module(BasicStringPackage::new().as_shared_module());
+		engine.register_global_module(MoreStringPackage::new().as_shared_module());
+
+		engine.set_max_expr_depths(0, 0);
+		// Enables custom operators
+		engine.set_fast_operators(false);
+
 		api::register_into_engine(&mut engine);
 		Self::register_api(
 			ct.clone(),
@@ -53,7 +68,7 @@ impl UiScriptExecutor {
 	}
 
 	/// Change the current scene
-	pub fn set_scene(&mut self, input: Arc<RenderInput>) -> Result<()> {
+	pub fn set_scene(&mut self, state: &RenderState, input: Arc<RenderInput>) -> Result<()> {
 		let current_scene = (*self.state).borrow().get_scene().clone();
 		if self.last_scene == current_scene {
 			return Ok(());
@@ -85,7 +100,7 @@ impl UiScriptExecutor {
 					.get(current_scene.as_ref().unwrap().as_str())
 					.unwrap(),
 				"init",
-				(State::new(input.clone()),),
+				(State::new(state, input.clone()),),
 			),
 		)
 		.with_context(|| format!("while running `init()`"))
@@ -104,7 +119,7 @@ impl UiScriptExecutor {
 				.borrow_mut()
 				.set_scene(ImmutableString::from(&ct.get_config().start_ui_scene));
 		}
-		self.set_scene(input.clone())?;
+		self.set_scene(state, input.clone())?;
 		let current_scene = (*self.state).borrow().get_scene().clone();
 
 		(*self.state).borrow_mut().step(state, input.clone());
@@ -121,7 +136,7 @@ impl UiScriptExecutor {
 				&mut self.scope,
 				ast,
 				"step",
-				(State::new(input.clone()),),
+				(State::new(state, input.clone()),),
 			))
 			.with_context(|| format!("while calling `step()`"))
 			.with_context(|| format!("in ui scene `{}`", current_scene.as_ref().unwrap()))?;
@@ -154,7 +169,7 @@ impl UiScriptExecutor {
 						.get(current_scene.as_ref().unwrap().as_str())
 						.unwrap(),
 					"event",
-					(State::new(input.clone()), PlayerShipStateEvent {}),
+					(State::new(state, input.clone()), PlayerShipStateEvent {}),
 				),
 			)
 			.with_context(|| format!("while handling player state change event"))
@@ -214,7 +229,7 @@ impl UiScriptExecutor {
 							.get(current_scene.as_ref().unwrap().as_str())
 							.unwrap(),
 						"event",
-						(State::new(input.clone()), event_arg.clone()),
+						(State::new(state, input.clone()), event_arg.clone()),
 					),
 				)
 				.with_context(|| format!("while handling event `{:?}`", event_arg))
@@ -222,6 +237,7 @@ impl UiScriptExecutor {
 			}
 		}
 
+		self.scope.rewind(0);
 		return Ok(());
 	}
 }
@@ -253,6 +269,12 @@ impl UiScriptExecutor {
 				let mut ui_state = c.borrow_mut();
 				ui_state.config.show_starfield = b;
 			});
+
+			engine.register_fn("print", move |d: Dynamic| {
+				debug!("{:?}", d);
+			});
+
+			engine.register_fn("clamp", move |x: f32, l: f32, h: f32| x.clamp(l, h));
 		}
 
 		// Sprites
@@ -263,7 +285,6 @@ impl UiScriptExecutor {
 				"add_sprite",
 				move |name: ImmutableString, sprite: ImmutableString, rect: Rect| {
 					let mut ui_state = c.borrow_mut();
-					let len = ui_state.len();
 
 					let sprite_handle = ct.get_sprite_handle(sprite.as_str());
 					if sprite_handle.is_none() {
@@ -271,16 +292,35 @@ impl UiScriptExecutor {
 						return;
 					}
 
-					ui_state.names.insert(name.clone(), len);
-					ui_state.elements.push(UiElement::Sprite(Sprite::new(
+					if ui_state.elements.contains_key(&name) {
+						error!("tried to make a sprite using an existing name `{name}`");
+						return;
+					}
+
+					ui_state.names.push(name.clone());
+					ui_state.elements.insert(
+						name.clone(),
+						UiElement::Sprite(Sprite::new(
 							&ct,
 							name.clone(),
 							sprite_handle.unwrap(),
 							rect,
-					)));
+						)),
+					);
 				},
 			);
 
+			let c = s.clone();
+			engine.register_fn("remove_sprite", move |name: ImmutableString| {
+				let mut ui_state = c.borrow_mut();
+				if ui_state.elements.contains_key(&name) {
+					ui_state.elements.remove(&name).unwrap();
+					ui_state.names.retain(|x| *x != name);
+				} else {
+					error!("called `remove_sprite` on an invalid name `{name}`")
+				}
+			});
+
 			let c = s.clone();
 			let ct = ct_src.clone();
 			engine.register_fn(
@@ -299,7 +339,7 @@ impl UiScriptExecutor {
 						}
 
 						_ => {
-							error!("called `set_sprite_mask` on an invalid name `{name}`")
+							error!("called `sprite_set_mask` on an invalid name `{name}`")
 						}
 					}
 				},
@@ -339,6 +379,51 @@ impl UiScriptExecutor {
 					}
 				},
 			);
+
+			let c = s.clone();
+			engine.register_fn("sprite_set_angle", move |name: ImmutableString, x: f32| {
+				let mut ui_state = c.borrow_mut();
+				match ui_state.get_mut_by_name(&name) {
+					Some(UiElement::Sprite(s)) => s.set_angle(x),
+					_ => {
+						error!("called `sprite_set_angle` on an invalid name `{name}`")
+					}
+				}
+			});
+
+			let c = s.clone();
+			engine.register_fn("sprite_set_rect", move |name: ImmutableString, x: Rect| {
+				let mut ui_state = c.borrow_mut();
+				match ui_state.get_mut_by_name(&name) {
+					Some(UiElement::Sprite(s)) => s.set_rect(x),
+					_ => {
+						error!("called `sprite_set_rect` on an invalid name `{name}`")
+					}
+				}
+			});
+
+			let c = s.clone();
+			engine.register_fn(
+				"sprite_set_color",
+				move |name: ImmutableString, x: Color| {
+					let mut ui_state = c.borrow_mut();
+					match ui_state.get_mut_by_name(&name) {
+						Some(UiElement::Sprite(s)) => s.set_color(x),
+						_ => {
+							error!("called `sprite_set_color` on an invalid name `{name}`")
+						}
+					}
+				},
+			);
+
+			let c = s.clone();
+			engine.register_fn("sprite_exists", move |name: ImmutableString| {
+				let mut ui_state = c.borrow_mut();
+				match ui_state.get_mut_by_name(&name) {
+					Some(UiElement::Sprite(_)) => true,
+					_ => false,
+				}
+			});
 		}
 
 		// Textboxes
@@ -354,17 +439,24 @@ impl UiScriptExecutor {
 				      rect: Rect,
 				      color: Color| {
 					let mut ui_state = c.borrow_mut();
-					let len = ui_state.len();
 
-					ui_state.names.insert(name.clone(), len);
-					ui_state.elements.push(UiElement::Text(TextBox::new(
+					if ui_state.elements.contains_key(&name) {
+						error!("tried to make a textbox using an existing name `{name}`");
+						return;
+					}
+
+					ui_state.names.push(name.clone());
+					ui_state.elements.insert(
+						name.clone(),
+						UiElement::Text(TextBox::new(
 							&mut font.borrow_mut(),
 							name.clone(),
 							font_size,
 							line_height,
 							rect,
 							color,
-					)));
+						)),
+					);
 				},
 			);
 
@@ -536,16 +628,23 @@ impl UiScriptExecutor {
 				// TODO: fix ugly spaces
 				move |name: ImmutableString, stroke: f32, color: Color, rect: Rect| {
 					let mut ui_state = c.borrow_mut();
-					let len = ui_state.len();
 
-					ui_state.names.insert(name.clone(), len);
-					ui_state.elements.push(UiElement::RadialBar(RadialBar::new(
+					if ui_state.elements.contains_key(&name) {
+						error!("tried to make a radialbar using an existing name `{name}`");
+						return;
+					}
+
+					ui_state.names.push(name.clone());
+					ui_state.elements.insert(
+						name.clone(),
+						UiElement::RadialBar(RadialBar::new(
 							name.clone(),
 							stroke,
 							color,
 							rect,
 							1.0,
-					)));
+						)),
+					);
 				},
 			);
 

crates/render/src/ui/state.rs

@@ -23,8 +23,8 @@ pub(crate) struct UiConfig {
 }
 
 pub(crate) struct UiState {
-	pub names: HashMap<ImmutableString, usize>,
-	pub elements: Vec<UiElement>,
+	pub elements: HashMap<ImmutableString, UiElement>,
+	pub names: Vec<ImmutableString>,
 
 	pub ct: Arc<Content>,
 	current_scene: Option<ImmutableString>,
@@ -42,8 +42,8 @@ impl UiState {
 	pub fn new(ct: Arc<Content>, state: &mut RenderState) -> Self {
 		Self {
 			ct,
-			names: HashMap::new(),
-			elements: Vec::new(),
+			elements: HashMap::new(),
+			names: Vec::new(),
 
 			current_scene: None,
 			show_timings: true,
@@ -79,15 +79,15 @@ impl UiState {
 	*/
 
 	pub fn get_mut_by_idx(&mut self, idx: usize) -> Option<&mut UiElement> {
-		self.elements.get_mut(idx)
+		let name = self.names.get(idx);
+		if name.is_none() {
+			return None;
+		}
+		self.elements.get_mut(name.unwrap())
 	}
 
 	pub fn get_mut_by_name(&mut self, name: &ImmutableString) -> Option<&mut UiElement> {
-		let idx = self.names.get(name);
-		if idx.is_none() {
-			return None;
-		}
-		self.get_mut_by_idx(*idx.unwrap())
+		self.elements.get_mut(name)
 	}
 
 	pub fn get_scene(&self) -> &Option<ImmutableString> {
@@ -124,7 +124,7 @@ impl<'a> UiState {
 			v.push(self.fps_indicator.get_textarea(input, window))
 		}
 
-		for t in self.elements.iter() {
+		for t in self.elements.values() {
 			match &t {
 				UiElement::Text(x) => v.push(x.get_textarea(input, window)),
 				_ => {}

crates/render/src/ui/util/sprite.rs

@@ -1,5 +1,9 @@
 use super::super::api::Rect;
-use crate::{ui::event::Event, vertexbuffer::types::UiInstance, RenderInput, RenderState};
+use crate::{
+	ui::{api::Color, event::Event},
+	vertexbuffer::types::UiInstance,
+	RenderInput, RenderState,
+};
 use galactica_content::{Content, SpriteAutomaton, SpriteHandle};
 use galactica_util::to_radians;
 use rhai::ImmutableString;
@@ -9,8 +13,12 @@ pub struct Sprite {
 	pub anim: SpriteAutomaton,
 	pub name: ImmutableString,
 
+	/// Sprite angle, in degrees
+	angle: f32,
+
 	rect: Rect,
 	mask: Option<SpriteHandle>,
+	color: Color,
 
 	/// If true, ignore mouse events until click is released
 	waiting_for_release: bool,
@@ -24,6 +32,8 @@ impl Sprite {
 			name,
 			anim: SpriteAutomaton::new(&ct, sprite),
 			rect,
+			angle: 0.0,
+			color: Color::new(1.0, 1.0, 1.0, 1.0),
 			mask: None,
 			has_mouse: false,
 			has_click: false,
@@ -35,6 +45,18 @@ impl Sprite {
 		self.mask = mask;
 	}
 
+	pub fn set_angle(&mut self, angle: f32) {
+		self.angle = angle;
+	}
+
+	pub fn set_rect(&mut self, rect: Rect) {
+		self.rect = rect;
+	}
+
+	pub fn set_color(&mut self, color: Color) {
+		self.color = color;
+	}
+
 	pub fn push_to_buffer(&self, input: &RenderInput, state: &mut RenderState) {
 		let rect = self
 			.rect
@@ -46,9 +68,9 @@ impl Sprite {
 
 		state.push_ui_buffer(UiInstance {
 			position: rect.pos.into(),
-			angle: to_radians(90.0),
+			angle: to_radians(90.0 + self.angle),
 			dim: rect.dim.into(),
-			color: [1.0, 1.0, 1.0, 1.0],
+			color: self.color.as_array(),
 			texture_index: anim_state.texture_index(),
 			texture_fade: anim_state.fade,
 			mask_index: self

crates/system/src/phys/mod.rs

@@ -6,7 +6,15 @@ mod physsim;
 mod physwrapper;
 mod stepresources;
 
+use std::sync::atomic::{AtomicU64, Ordering};
+
 pub use physimage::*;
 pub use physsim::{PhysSim, PhysSimShipHandle};
 pub use physwrapper::PhysWrapper;
 pub use stepresources::*;
+
+/// A unique id given to each physics object
+static PHYS_UID: AtomicU64 = AtomicU64::new(0);
+fn get_phys_id() -> u64 {
+	PHYS_UID.fetch_add(1, Ordering::Relaxed)
+}

crates/system/src/phys/objects/ship/ship.rs

@@ -14,6 +14,7 @@ use super::{autopilot, collapse::ShipCollapseSequence, controller::ShipControlle
 use crate::{
 	data::{ShipAutoPilot, ShipData, ShipPersonality, ShipState},
 	phys::{
+		get_phys_id,
 		objects::{PhysEffect, PhysProjectile},
 		physsim::NewObjects,
 		PhysImage, PhysSimShipHandle, PhysStepResources, PhysWrapper,
@@ -23,6 +24,9 @@ use crate::{
 /// A ship instance in the physics system
 #[derive(Debug, Clone)]
 pub struct PhysShip {
+	/// This ship's unique id
+	pub uid: u64,
+
 	/// This ship's physics handle
 	pub rigid_body: RigidBodyHandle,
 
@@ -71,6 +75,7 @@ impl PhysShip {
 	) -> Self {
 		let ship_ct = ct.get_ship(handle);
 		PhysShip {
+			uid: get_phys_id(),
 			anim: SpriteAutomaton::new(ct, ship_ct.sprite),
 			rigid_body,
 			collider,

crates/util/src/lib.rs

@@ -13,6 +13,11 @@ pub fn to_radians(degrees: f32) -> f32 {
 	return (degrees / 360.0) * std::f32::consts::TAU;
 }
 
+/// Convert an angle in radians to degrees
+pub fn to_degrees(radians: f32) -> f32 {
+	return (radians / std::f32::consts::TAU) * 360.0;
+}
+
 /// Compute the clockwise angle between two vectors
 /// Returns a value in [-pi, pi]
 pub fn clockwise_angle(a: &Vector2<f32>, b: &Vector2<f32>) -> f32 {