Add collectable items

js/consts.mjs

@@ -11,7 +11,7 @@ export const EPSILON = 1e-8;
 // Unit length of sector. Only for internal representation.
 export const SECTOR_SIZE = 512;
 // G, G-boy, The big G, Mr. G, g's big brother, G-dog
-export const GRAVITATIONAL_CONSTANT = 0.01;
+export const GRAVITATIONAL_CONSTANT = 0.002;
 // Perspective constraints. Higher zoom value = closer.
 export const MIN_ZOOM = 1;
 export const MAX_ZOOM = 100;
@@ -22,7 +22,11 @@ export const TIP_ANGLE = 0.3;
 export const TIP_SPEED = 0.015;
 // Ship flight mechanics. Speed measured in units per tick.
 export const FUEL_BURN_RATE = 0.01;
+export const THRUST_POWER = 0.007;
+export const TURN_POWER = 0.05;
 // Distance at which an orbited planet will not be considered a parent body.
 export const MAX_PARENT_CELESTIAL_DISTANCE = 120;
 // Ship editing.
 export const EDIT_MARGIN = 2;
+// Floating items.
+export const ENTITY_ROTATION_RATE = 0.01;

js/game/events.mjs

@@ -2,6 +2,8 @@ import * as game from './index.mjs';
 import * as graphics from '../graphics/index.mjs';
 import * as world from '../world/index.mjs';
 import * as player from './player.mjs';
+import * as inventory from './inventory.mjs';
+import * as particle from '../world/particle.mjs';
 import * as edit from './edit.mjs';
 
 export let shipLanded = false;
@@ -48,3 +50,12 @@ export function invalidTilePlacement() {
 export function tilePlacement() {
 	// TODO: Play some audio.
 }
+
+export function tossItem() {
+	particle.createItemToss(world.playerShip);
+}
+
+export function collectItem(type, id) {
+	inventory.addItem(type, id);
+	return true;
+}

js/game/inventory.mjs

@@ -1,5 +1,6 @@
 import {modules} from '../data.mjs';
 import {images as assets} from '../assets.mjs';
+import * as events from './events.mjs';
 
 export const items = new Map();
 export let currentItem = null;
@@ -30,6 +31,7 @@ export function removeItem(type, id) {
 		items.delete(mapId);
 		currentItem = null;
 	}
+	events.tossItem();
 }
 
 export function selectItem(type, id) {

js/graphics/world.mjs

@@ -7,6 +7,7 @@ export function render() {
 	world.particles.forEach(renderParticle);
 	world.celestials.forEach(renderCelestial);
 	world.ships.forEach(renderShip);
+	world.entities.forEach(renderEntity);
 }
 
 function renderParticle(particle) {
@@ -14,6 +15,14 @@ function renderParticle(particle) {
 	context.fillRect(...particle.com, particle.size, particle.size);
 }
 
+function renderEntity(entity) {
+	context.save();
+	context.translate(...entity.com);
+	context.rotate(entity.r);
+	context.drawImage(entity.image, -0.5, -0.5, 1, 1);
+	context.restore();
+}
+
 function renderShip(ship) {
 	context.save();
 	context.translate(...ship.com);

js/world/body.mjs

@@ -24,6 +24,15 @@ export default class Body {
 		return Math.sqrt(this.xvel ** 2 + this.yvel ** 2);
 	}
 
+	getCelestialCollision(celestials) {
+		let result = false;
+		celestials.forEach(c => {
+			let dis = this.distanceTo(c);
+			if (dis < c.radius) result = c;
+		});
+		return result;
+	}
+
 	getWorldPoint(lx, ly) {
 		let [cx, cy] = this.localCom;
 		let [nx, ny] = this.rotateVector(lx - cx, ly - cy, this.r);
@@ -55,7 +64,7 @@ export default class Body {
 
 	tickGravity(bodies) {
 		bodies.forEach(b => {
-			let force = b.mass / this.mass / (this.distanceTo(b) ** 2) * G;
+			let force = b.mass / (this.distanceTo(b) ** 2) * G;
 			let [[ax, ay], [bx, by]] = [this.com, b.com];
 			let angle = Math.atan2(by - ay, bx - ax);
 			this.xvel += Math.cos(angle) * force;

js/world/entity.mjs

@@ -1,64 +1,59 @@
 import Body from './body.mjs';
 import {modules} from '../data.mjs';
-import {celestials, particles} from './index.mjs';
+import {playerShip} from './index.mjs';
+import {images as assets} from '../assets.mjs';
+import {celestials, particles, entities} from './index.mjs';
+import * as particle from './particle.mjs';
+import * as consts from '../consts.mjs';
+import * as events from '../game/events.mjs';
 
-export function createThrustExhaust(thruster) {
-	let ship = thruster.ship;
-	let [fx, fy] = ship.relativeVector(0, 0.2);
-	let [dx, dy] = ship.relativeVector((Math.random() - 0.5) * 0.5, 0.5);
-	let [cx, cy] = thruster.com;
-	particles.add(new Particle(cx + dx, cy + dy, {
-		xvel: ship.xvel + fx,
-		yvel: ship.yvel + fy,
-		color: '#f4c542',
-		lifetime: 5,
-		size: 0.07
-	}));
-}
-
-class Particle extends Body {
-	constructor(x, y, {
+export default class Entity extends Body {
+	constructor(x, y, type = 'fuel', id = 'small', {
 		xvel = 0,
 		yvel = 0,
-		spray = 0.1,
-		fizzle = 0,
-		maxFizzle = fizzle * 2,
-		color = '#fff',
-		gravity = false,
-		lifetime = 50,
-		size = 0.1,
-		friction = 0.99
-	}) {
-		super(x, y, 0.1);
+		gravity = false
+	} = {}) {
+		super(x, y, 100);
 
-		this.size = size;
-		this.xvel = xvel + (Math.random() - 0.5) * spray;
-		this.yvel = yvel + (Math.random() - 0.5) * spray;
-		this.friction = friction;
-		this.fizzle = fizzle;
-		this.maxFizzle = maxFizzle;
-		this.color = color;
+		this.xvel = xvel;
+		this.yvel = yvel;
+		this.width = 1;
+		this.height = 1;
+		this.radius = (this.width + this.height) / 2;
+		this.type = type;
+		this.id = id;
+		this.image = assets.modules[type][id];
 		this.gravity = gravity;
-		this.life = lifetime;
+		this.touched = false;
 	}
 
 	get com() {
-		return [this.x - this.size / 2, this.y - this.size / 2];
+		return [this.x + this.width / 2, this.y + this.height / 2];
+	}
+
+	orbit(celestial, radius) {
+		this.gravity = true;
+	}
+
+	remove() {
+		entities.delete(this);
 	}
 
 	tick() {
-		if (!this.life--) {
-			particles.delete(this);
-			return;
-		}
-
+		this.r += consts.ENTITY_ROTATION_RATE;
 		this.tickMotion();
 		if (this.gravity) this.tickGravity(celestials);
+		let col = this.getCelestialCollision(celestials);
 
-		this.xvel *= this.friction;
-		this.yvel *= this.friction;
-		this.x += (Math.random() - 0.5) * this.fizzle;
-		this.y += (Math.random() - 0.5) * this.fizzle;
-		if (this.fizzle < this.mazFizzle) this.fizzle *= 1.05;
+		if (col !== false) {
+			this.remove();
+		}
+
+		if (playerShip.colliding(this.com, this.radius)) {
+			let success = events.collectItem(this.type, this.id);
+			if (!success) return;
+			particle.createPickupBurst(playerShip, this.com);
+			this.remove();
+		}
 	}
 }

js/world/index.mjs

@@ -21,6 +21,7 @@ export function init() {
 	particles.clear();
 	spawn.player();
 	spawn.startPlanet();
+	spawn.testEntity();
 }
 
 export function tick() {

js/world/particle.mjs

@@ -15,6 +15,31 @@ export function createThrustExhaust(thruster) {
 	}));
 }
 
+export function createPickupBurst(ship, point) {
+	for (let i = 0; i < 20; i++) {
+		particles.add(new Particle(...point, {
+			xvel: ship.xvel,
+			yvel: ship.yvel,
+			color: '#eae55d',
+			lifetime: Math.random() * 20 + 15,
+			friction: 0.95,
+			size: Math.random() * 0.2 + 0.05,
+			spray: 0.3
+		}));
+	}
+}
+
+export function createItemToss(ship) {
+	particles.add(new Particle(...ship.com, {
+		xvel: ship.xvel,
+		yvel: ship.yvel,
+		color: '#a87234',
+		lifetime: 50,
+		size: 0.6,
+		spray: 0.4
+	}));
+}
+
 class Particle extends Body {
 	constructor(x, y, {
 		xvel = 0,
@@ -46,7 +71,7 @@ class Particle extends Body {
 	}
 
 	tick() {
-		if (!this.life--) {
+		if (this.life-- <= 0) {
 			particles.delete(this);
 			return;
 		}

js/world/ship.mjs

@@ -83,6 +83,19 @@ export default class Ship extends Body {
 			Math.max(Math.sqrt((bx - lx) ** 2 + (by - ly) ** 2), a), 0) + 1;
 	}
 
+	colliding(point, radius) {
+		let [px, py] = point;
+		let result = false;
+
+		this.modules.forEach(m => {
+			let [mx, my] = this.getWorldPoint(...m.localCom);
+			let dis = Math.sqrt((py - my) ** 2 + (px - mx) ** 2);
+			if (dis < radius) result = true;
+		});
+
+		return result;
+	}
+
 	resolveCollisions() {
 		this.landed = false;
 
@@ -127,8 +140,11 @@ export default class Ship extends Body {
 
 	applyThrust({ forward = 0, left = 0, right = 0, back = 0,
 		turnLeft = 0, turnRight = 0}) {
-		let turnForce = (turnRight - turnLeft) / 20;
-		this.applyDirectionalForce(0, -forward / 30, turnForce);
+
+		let thrustForce = -forward * consts.THRUST_POWER;
+		let turnForce = (turnRight - turnLeft) * consts.TURN_POWER;
+
+		this.applyDirectionalForce(0, thrustForce, turnForce);
 
 		this.modules.forEach(m => {
 			if (m.type !== 'thruster') return;

js/world/spawn.mjs

@@ -1,6 +1,7 @@
 import Ship from './ship.mjs';
 import Module from './module.mjs';
 import Celestial from './celestial.mjs';
+import Entity from './entity.mjs';
 import {modules} from '../data.mjs';
 import * as world from './index.mjs';
 
@@ -16,11 +17,17 @@ export function player() {
 
 export function startPlanet() {
 	return celestial(0, 0, 40, {
-		density: 10,
+		density: 3,
 		type: 'green'
 	});
 }
 
+export function testEntity() {
+	let entity = new Entity(0, -50);
+	world.entities.add(entity);
+	return entity;
+}
+
 export function celestial(x, y, radius, params) {
 	let celestial = new Celestial(x - radius, y - radius, radius, params);
 	world.celestials.add(celestial);