Added projectile parameters

TODO.md

@@ -1,5 +1,4 @@
 ## Specific Jobs
- - Define projectile colliders & particles
  - Particle variation
  - Animated sprites
  - UI: health, shield, fuel, heat, energy bars

content/guns.toml

@@ -4,10 +4,10 @@ space.weapon = 10
 
 # Average delay between shots
 rate = 0.2
-# Random rate variation (+- this in both directions)
+# Random rate variation (each cooldown is +- this)
 rate_rng = 0.1
 
-
+# TODO: apply force on fire
 projectile.sprite_texture = "projectile::blaster"
 # Height of projectile in game units
 projectile.size = 6
@@ -24,3 +24,18 @@ projectile.damage = 10.0
 # If this is 10, projectiles will form a cone of 10 degrees
 # ( 5 degrees on each side )
 projectile.angle_rng = 2
+# How much force this projectile will apply to an object it hits
+projectile.force = 0.0
+
+projectile.collider.ball.radius = 2.0
+
+projectile.impact.texture = "particle::blaster"
+projectile.impact.lifetime = "inherit"
+projectile.impact.inherit_velocity = "target"
+projectile.impact.size = 3.0
+
+
+projectile.expire.texture = "particle::blaster"
+projectile.expire.lifetime = "inherit"
+projectile.expire.inherit_velocity = "projectile"
+projectile.expire.size = 3.0

content/textures.toml

@@ -17,7 +17,7 @@ file = "planet/luna.png"
 file = "projectile/blaster.png"
 
 [texture."ship::gypsum"]
-file = "ship/gypsum2.png"
+file = "ship/gypsum.png"
 
 [texture."ui::radar"]
 file = "ui/radar.png"

crates/content/src/lib.rs

@@ -19,8 +19,8 @@ use walkdir::WalkDir;
 
 pub use handle::{FactionHandle, GunHandle, OutfitHandle, ShipHandle, SystemHandle, TextureHandle};
 pub use part::{
-	EnginePoint, Faction, Gun, GunPoint, Outfit, OutfitSpace, Projectile, Relationship, RepeatMode,
-	Ship, System, Texture,
+	EnginePoint, Faction, Gun, GunPoint, ImpactInheritVelocity, Outfit, OutfitSpace, Projectile,
+	ProjectileCollider, ProjectileParticle, Relationship, RepeatMode, Ship, System, Texture,
 };
 
 mod syntax {

crates/content/src/part/gun.rs

@@ -1,7 +1,7 @@
-use std::collections::HashMap;
-
-use anyhow::{bail, Result};
+use anyhow::{bail, Context, Result};
 use cgmath::Deg;
+use serde::Deserialize;
+use std::collections::HashMap;
 
 use crate::{handle::TextureHandle, Content};
 
@@ -32,7 +32,58 @@ pub(crate) mod syntax {
 		pub lifetime_rng: f32,
 		pub damage: f32,
 		pub angle_rng: f32,
+		pub impact: Option<ProjectileParticle>,
+		pub expire: Option<ProjectileParticle>,
+		pub collider: super::ProjectileCollider,
+		pub force: f32,
 	}
+
+	#[derive(Debug, Deserialize)]
+	pub struct ProjectileParticle {
+		pub texture: String,
+		pub lifetime: ParticleLifetime,
+		pub inherit_velocity: super::ImpactInheritVelocity,
+		pub size: f32,
+	}
+
+	#[derive(Debug, Deserialize)]
+	#[serde(untagged)]
+	pub enum ParticleLifetime {
+		Inherit(String),
+		Seconds(f32),
+	}
+}
+
+/// Defines a projectile's collider
+#[derive(Debug, Deserialize, Clone)]
+pub enum ProjectileCollider {
+	/// A ball collider
+	#[serde(rename = "ball")]
+	Ball(BallCollider),
+}
+
+#[derive(Debug, Deserialize, Clone)]
+pub struct BallCollider {
+	pub radius: f32,
+}
+
+/// How we should set an impact particle's velocity
+#[derive(Debug, Deserialize, Clone)]
+pub enum ImpactInheritVelocity {
+	/// Don't inherit any velocity.
+	/// This impact particle will be still.
+	#[serde(rename = "don't")]
+	Dont,
+
+	/// Inherit target velocity.
+	/// This impact particle will stick to the object it hits.
+	#[serde(rename = "target")]
+	Target,
+
+	/// Inherit projectile velocity.
+	/// This impact particle will continue on its projectile's path.
+	#[serde(rename = "projectile")]
+	Projectile,
 }
 
 /// Represents a gun outfit.
@@ -81,12 +132,74 @@ pub struct Projectile {
 	/// The damage this projectile does
 	pub damage: f32,
 
+	/// The force this projectile applies
+	pub force: f32,
+
 	/// The angle variation of this projectile.
 	/// Projectiles can be off center up to
 	/// `spread / 2` degrees in both directions.
 	///
 	/// (Forming a "fire cone" of `spread` degrees)
 	pub angle_rng: Deg<f32>,
+
+	/// The particle this projectile will spawn when it hits something
+	pub impact_particle: Option<ProjectileParticle>,
+
+	/// The particle this projectile will spawn when it expires
+	pub expire_particle: Option<ProjectileParticle>,
+
+	/// Collider parameters for this projectile
+	pub collider: ProjectileCollider,
+}
+
+/// The particle a projectile will spawn when it hits something
+#[derive(Debug, Clone)]
+pub struct ProjectileParticle {
+	/// The texture to use for this particle.
+	/// This is most likely animated.
+	pub texture: TextureHandle,
+
+	/// How many seconds this particle should live
+	pub lifetime: f32,
+
+	/// How we should set this particle's velocity
+	pub inherit_velocity: ImpactInheritVelocity,
+
+	/// The height of this particle, in game units.
+	pub size: f32,
+}
+
+fn parse_projectile_particle(
+	ct: &Content,
+	p: Option<syntax::ProjectileParticle>,
+) -> Result<Option<ProjectileParticle>> {
+	if let Some(impact) = p {
+		let impact_texture = match ct.texture_index.get(&impact.texture) {
+			None => bail!("impact texture `{}` doesn't exist", impact.texture),
+			Some(t) => *t,
+		};
+
+		let impact_lifetime = match impact.lifetime {
+			syntax::ParticleLifetime::Seconds(s) => s,
+			syntax::ParticleLifetime::Inherit(s) => {
+				if s == "inherit" {
+					let t = ct.get_texture(impact_texture);
+					t.fps * t.frames.len() as f32
+				} else {
+					bail!("bad impact lifetime, must be float or \"inherit\"",)
+				}
+			}
+		};
+
+		Ok(Some(ProjectileParticle {
+			texture: impact_texture,
+			lifetime: impact_lifetime,
+			inherit_velocity: impact.inherit_velocity,
+			size: impact.size,
+		}))
+	} else {
+		Ok(None)
+	}
 }
 
 impl crate::Build for Gun {
@@ -94,22 +207,29 @@ impl crate::Build for Gun {
 
 	fn build(gun: Self::InputSyntax, ct: &mut Content) -> Result<()> {
 		for (gun_name, gun) in gun {
-			let th = match ct.texture_index.get(&gun.projectile.sprite_texture) {
+			let projectile_texture = match ct.texture_index.get(&gun.projectile.sprite_texture) {
 				None => bail!(
-					"In gun `{}`: texture `{}` doesn't exist",
+					"In gun `{}`: projectile texture `{}` doesn't exist",
 					gun_name,
 					gun.projectile.sprite_texture
 				),
 				Some(t) => *t,
 			};
 
+			let impact_particle = parse_projectile_particle(ct, gun.projectile.impact)
+				.with_context(|| format!("In gun `{}`", gun_name))?;
+
+			let expire_particle = parse_projectile_particle(ct, gun.projectile.expire)
+				.with_context(|| format!("In gun `{}`", gun_name))?;
+
 			ct.guns.push(Self {
 				name: gun_name,
 				space: gun.space.into(),
 				rate: gun.rate,
 				rate_rng: gun.rate_rng,
 				projectile: Projectile {
-					sprite_texture: th,
+					force: gun.projectile.force,
+					sprite_texture: projectile_texture,
 					size: gun.projectile.size,
 					size_rng: gun.projectile.size_rng,
 					speed: gun.projectile.speed,
@@ -118,6 +238,9 @@ impl crate::Build for Gun {
 					lifetime_rng: gun.projectile.lifetime_rng,
 					damage: gun.projectile.damage,
 					angle_rng: Deg(gun.projectile.angle_rng),
+					impact_particle,
+					expire_particle,
+					collider: gun.projectile.collider,
 				},
 			});
 		}

crates/content/src/part/mod.rs

@@ -9,7 +9,7 @@ pub mod system;
 pub mod texture;
 
 pub use faction::{Faction, Relationship};
-pub use gun::{Gun, Projectile};
+pub use gun::{Gun, ImpactInheritVelocity, Projectile, ProjectileCollider, ProjectileParticle};
 pub use outfit::Outfit;
 pub use shared::OutfitSpace;
 pub use ship::{EnginePoint, GunPoint, Ship};

crates/galactica/src/game.rs

@@ -168,7 +168,7 @@ impl Game {
 			.get_ship_mut(&self.player)
 			.unwrap()
 			.physics_handle;
-		let r = self.world.get_rigid_body(r.0); // TODO: r.0 shouldn't be public
+		let r = self.world.get_rigid_body(r.0).unwrap(); // TODO: r.0 shouldn't be public
 		let ship_pos = util::rigidbody_position(r);
 		self.camera.pos = ship_pos;
 		self.last_update = Instant::now();

crates/world/src/world.rs

@@ -1,6 +1,6 @@
 use cgmath::{Deg, EuclideanSpace, InnerSpace, Matrix2, Point2, Rad, Vector2};
 use crossbeam::channel::Receiver;
-use nalgebra::vector;
+use nalgebra::{point, vector};
 use rand::Rng;
 use rapier2d::{
 	dynamics::{RigidBody, RigidBodyBuilder, RigidBodyHandle},
@@ -27,19 +27,28 @@ pub struct World {
 
 // Private methods
 impl<'a> World {
-	fn remove_projectile(&mut self, c: ColliderHandle) {
+	fn remove_projectile(
+		&mut self,
+		c: ColliderHandle,
+	) -> Option<(RigidBody, ProjectileWorldObject)> {
 		let p = match self.projectiles.remove(&c) {
 			Some(p) => p,
-			None => return,
+			None => return None,
 		};
-		self.wrapper.rigid_body_set.remove(
-			p.rigid_body,
-			&mut self.wrapper.im,
-			&mut self.wrapper.collider_set,
-			&mut self.wrapper.ij,
-			&mut self.wrapper.mj,
-			true,
-		);
+		let r = self
+			.wrapper
+			.rigid_body_set
+			.remove(
+				p.rigid_body,
+				&mut self.wrapper.im,
+				&mut self.wrapper.collider_set,
+				&mut self.wrapper.ij,
+				&mut self.wrapper.mj,
+				true,
+			)
+			.unwrap();
+
+		return Some((r, p));
 	}
 
 	fn remove_ship(&mut self, h: ShipPhysicsHandle) {
@@ -92,10 +101,12 @@ impl<'a> World {
 				.linvel(vector![vel.x, vel.y])
 				.build();
 
-			let collider = ColliderBuilder::ball(1.0)
-				.sensor(true)
-				.active_events(ActiveEvents::COLLISION_EVENTS)
-				.build();
+			let collider = match &projectile.content.collider {
+				content::ProjectileCollider::Ball(b) => ColliderBuilder::ball(b.radius)
+					.sensor(true)
+					.active_events(ActiveEvents::COLLISION_EVENTS)
+					.build(),
+			};
 
 			let rigid_body = self.wrapper.rigid_body_set.insert(rigid_body);
 			let collider = self.wrapper.collider_set.insert_with_parent(
@@ -114,6 +125,83 @@ impl<'a> World {
 			);
 		}
 	}
+
+	fn collide_projectile_ship(
+		&mut self,
+		ct: &content::Content,
+		particles: &mut Vec<ParticleBuilder>,
+		projectile_h: ColliderHandle,
+		ship_h: ColliderHandle,
+	) {
+		let projectile = self.projectiles.get(&projectile_h);
+		let ship = self.ships.get_mut(&ship_h);
+		if projectile.is_none() || ship.is_none() {
+			return;
+		}
+		let projectile = projectile.unwrap();
+		let ship = ship.unwrap();
+
+		let hit = ship
+			.ship
+			.handle_projectile_collision(ct, &projectile.projectile);
+		let s = ship.physics_handle;
+		if hit {
+			let pr = self
+				.wrapper
+				.rigid_body_set
+				.get(projectile.rigid_body)
+				.unwrap();
+			let v = util::rigidbody_velocity(pr).normalize() * projectile.projectile.content.force;
+			let pos = util::rigidbody_position(pr);
+			let _ = pr;
+
+			let r = self.wrapper.rigid_body_set.get_mut(s.0).unwrap();
+			r.apply_impulse_at_point(vector![v.x, v.y], point![pos.x, pos.y], true);
+
+			// Borrow again, we can only have one at a time
+			let pr = self
+				.wrapper
+				.rigid_body_set
+				.get(projectile.rigid_body)
+				.unwrap();
+			let pos = util::rigidbody_position(pr);
+			let angle: Deg<f32> = util::rigidbody_rotation(pr)
+				.angle(Vector2 { x: 1.0, y: 0.0 })
+				.into();
+
+			match &projectile.projectile.content.impact_particle {
+				None => {}
+				Some(x) => {
+					let velocity = match x.inherit_velocity {
+						content::ImpactInheritVelocity::Dont => Vector2 { x: 0.0, y: 0.0 },
+						content::ImpactInheritVelocity::Projectile => util::rigidbody_velocity(pr),
+						content::ImpactInheritVelocity::Target => {
+							// Match target ship velocity.
+							// Particles will fly off if the ship is spinning fast, but I
+							// haven't found a good way to fix that.
+							let (_, sr) = self.get_ship_body(s).unwrap();
+							let velocity =
+								sr.velocity_at_point(&nalgebra::Point2::new(pos.x, pos.y));
+							Vector2 {
+								x: velocity.x,
+								y: velocity.y,
+							}
+						}
+					};
+					particles.push(ParticleBuilder {
+						texture: x.texture,
+						pos: Point2 { x: pos.x, y: pos.y },
+						velocity,
+						angle: -angle,
+						lifetime: x.lifetime,
+						size: x.size,
+					});
+				}
+			};
+
+			self.remove_projectile(projectile.collider);
+		}
+	}
 }
 
 // Public methods
@@ -199,76 +287,71 @@ impl<'a> World {
 		// Handle collision events
 		while let Ok(event) = &self.collision_queue.try_recv() {
 			if event.started() {
-				let a = &event.collider1();
-				let b = &event.collider2();
+				let a = event.collider1();
+				let b = event.collider2();
 
 				// If projectiles are part of this collision, make sure
 				// `a` is one of them.
-				let (a, b) = if self.projectiles.contains_key(b) {
+				let (a, b) = if self.projectiles.contains_key(&b) {
 					(b, a)
 				} else {
 					(a, b)
 				};
 
-				if let Some(p) = self.projectiles.get(a) {
-					let hit = if let Some(s) = self.ships.get_mut(b) {
-						s.ship.handle_projectile_collision(ct, &p.projectile)
-					} else {
-						false
-					};
-
-					// Stupid re-borrow trick.
-					// We can't have s be mutable inside this block.
-					if let Some(s) = self.ships.get(b) {
-						if hit {
-							let pr = self.get_rigid_body(p.rigid_body);
-							let pos = util::rigidbody_position(pr);
-							let angle: Deg<f32> = util::rigidbody_rotation(pr)
-								.angle(Vector2 { x: 1.0, y: 0.0 })
-								.into();
-
-							// Match target ship velocity, so impact particles are "sticky".
-							// Particles will fly off if the ship is spinning fast, but I
-							// haven't found a good way to fix that.
-							let (_, sr) = self.get_ship_body(s.physics_handle).unwrap();
-							let velocity =
-								sr.velocity_at_point(&nalgebra::Point2::new(pos.x, pos.y));
-							let velocity = Vector2 {
-								x: velocity.x,
-								y: velocity.y,
-							};
-
-							particles.push(ParticleBuilder {
-								texture: ct.get_texture_handle("particle::blaster"),
-								pos: Point2 { x: pos.x, y: pos.y },
-								velocity,
-								angle: -angle,
-								lifetime: 0.15,
-								size: 5.0,
-							});
-							self.remove_projectile(*a);
-						}
-					}
+				let p = self.projectiles.get(&a);
+				let s = self.ships.get_mut(&b);
+				if p.is_none() || s.is_none() {
+					continue;
 				}
+				self.collide_projectile_ship(ct, particles, a, b);
 			}
 		}
 
 		// Delete projectiles
 		let mut to_remove = Vec::new();
-		for (_, p) in &mut self.projectiles {
+		for (c, p) in &mut self.projectiles {
 			p.projectile.tick(t);
 			if p.projectile.is_expired() {
-				to_remove.push(p.collider);
+				to_remove.push(*c);
 			}
 		}
-		for i in to_remove {
-			self.remove_projectile(i);
+		for c in to_remove {
+			let (pr, p) = self.remove_projectile(c).unwrap();
+
+			match &p.projectile.content.expire_particle {
+				None => {}
+				Some(x) => {
+					let pos = util::rigidbody_position(&pr);
+					let angle: Deg<f32> = util::rigidbody_rotation(&pr)
+						.angle(Vector2 { x: 1.0, y: 0.0 })
+						.into();
+
+					let velocity = match x.inherit_velocity {
+						content::ImpactInheritVelocity::Target
+						| content::ImpactInheritVelocity::Dont => Vector2 { x: 0.0, y: 0.0 },
+						content::ImpactInheritVelocity::Projectile => util::rigidbody_velocity(&pr),
+					};
+					particles.push(ParticleBuilder {
+						texture: x.texture,
+						pos: Point2 { x: pos.x, y: pos.y },
+						velocity,
+						angle: -angle,
+						lifetime: x.lifetime,
+						size: x.size,
+					});
+				}
+			};
 		}
 	}
 
 	/// Get a rigid body from a handle
-	pub fn get_rigid_body(&self, r: RigidBodyHandle) -> &RigidBody {
-		&self.wrapper.rigid_body_set[r]
+	pub fn get_rigid_body(&self, r: RigidBodyHandle) -> Option<&RigidBody> {
+		self.wrapper.rigid_body_set.get(r)
+	}
+
+	/// Get a rigid body from a handle
+	pub fn get_rigid_body_mut(&mut self, r: RigidBodyHandle) -> Option<&mut RigidBody> {
+		self.wrapper.rigid_body_set.get_mut(r)
 	}
 
 	/// Get a ship from a handle