Improve planet collision

js/graphics/index.mjs

@@ -58,8 +58,7 @@ class Perspective {
 		}
 
 		if (this.focus !== null) {
-			this.x = this.focus.x;
-			this.y = this.focus.y;
+			[this.x, this.y] = this.focus.com;
 		}
 
 		if (this.rotationFocus !== null) {

js/graphics/world.mjs

@@ -5,15 +5,19 @@ import * as world from '../world/index.mjs';
 export function render() {
 	world.celestials.forEach(renderCelestial);
 	world.ships.forEach(renderShip);
+	if (typeof window.q !== 'undefined') {
+		context.fillStyle = 'red';
+	}
 }
 
 function renderShip(ship) {
 	context.save();
-	context.translate(ship.x, ship.y);
+	context.translate(...ship.com);
 	context.rotate(ship.r);
-	let [cx, cy] = ship.com;
+	let [cx, cy] = ship.localCom;
+	context.translate(-cx, -cy);
 	ship.modules.forEach(m => {
-		context.drawImage(m.currentImage, m.x - cx, m.y - cy, 1, 1);
+		context.drawImage(m.currentImage, m.x, m.y, 1, 1);
 	});
 	context.restore();
 }
@@ -23,6 +27,6 @@ const celestialImages = {
 }
 
 function renderCelestial(cel) {
-	context.drawImage(cel.image, cel.x - cel.radius, cel.y - cel.radius,
+	context.drawImage(cel.image, cel.x, cel.y,
 		cel.diameter, cel.diameter);
 }

js/world/body.mjs

@@ -12,6 +12,32 @@ export default class Body {
 		this.mass = mass;
 	}
 
+	get com() {
+		return [this.x, this.y];
+	}
+
+	get pos() {
+		return [this.x, this.y];
+	}
+
+	getWorldPoint(lx, ly) {
+		let [cx, cy] = this.localCom;
+		let [nx, ny] = this.rotateVector(lx - cx, ly - cy, this.r);
+		return [nx + this.x + cx, ny + this.y + cy];
+	}
+
+	getLocalPoint(wx, wy) {
+		let [lx, ly] = [wx - this.x, wy - this.y];
+		let [cx, cy] = this.localCom;
+		let [nx, ny] = this.rotateVector(lx, ly, -this.r);
+		return [nx - cx, ny - cy];
+	}
+
+	rotateVector(x, y, r) {
+		return [(x * Math.cos(this.r) - y * Math.sin(this.r)),
+			(y * Math.cos(this.r) - x * Math.sin(this.r))];
+	}
+
 	tickMotion() {
 		this.x += this.xvel;
 		this.y += this.yvel;
@@ -22,19 +48,23 @@ export default class Body {
 	tickGravity(bodies) {
 		bodies.forEach(b => {
 			let force = b.mass / this.mass / (this.distanceTo(b) ** 2) * G;
-			let angle = Math.atan2(b.y - this.y, b.x - this.x);
+			let [[ax, ay], [bx, by]] = [this.com, b.com];
+			let angle = Math.atan2(by - ay, bx - ax);
 			this.xvel += Math.cos(angle) * force;
 			this.yvel += Math.sin(angle) * force;
 		});
 	}
 
 	distanceTo(body) {
-		return Math.max(Math.sqrt(((body.x - this.x) ** 2) +
-			((body.y - this.y) ** 2)), 1);
+		let [[ax, ay], [bx, by]] = [this.com, body.com];
+		let result =  Math.max(Math.sqrt(((bx - ax) ** 2) +
+			((by - ay) ** 2)), 1);
+		return result;
 	}
 
 	approach(body, distance) {
-		let angle = Math.atan2(body.y - this.y, body.x - this.x);
+		let [[ax, ay], [bx, by]] = [this.com, body.com];
+		let angle = Math.atan2(by - ay, bx - ax);
 		this.x += Math.cos(angle) * distance;
 		this.y += Math.sin(angle) * distance;
 	}
@@ -45,8 +75,9 @@ export default class Body {
 	}
 
 	applyDirectionalForce(x, y, r) {
-		this.xvel += (x * Math.cos(this.r) - y * Math.sin(this.r)) / this.mass;
-		this.yvel += (y * Math.cos(this.r) - x * Math.sin(this.r)) / this.mass;
+		let [vx, vy] = this.rotateVector(x, y, r);
+		this.xvel += vx;
+		this.yvel += vy;
 		this.rvel += r / this.mass;
 	}
 }

js/world/celestial.mjs

@@ -15,12 +15,12 @@ export default class Celestial extends Body {
 		this.image = imageArr[Math.random() * imageArr.length | 0];
 	}
 
-	tick() {
-
+	get com() {
+		return [this.x + this.radius, this.y + this.radius];
 	}
 
-	get center() {
-		return [this.x + this.radius / 2, this.y + this.radius / 2];
+	tick() {
+
 	}
 
 	get diameter() {

js/world/module.mjs

@@ -1,7 +1,7 @@
 import {images as assets} from '../assets.mjs';
 
 export default class Module {
-	constructor(x, y, {
+	constructor(x, y, ship, {
 		name = 'Unnamed Module',
 		type = 'block',
 		id = 'unknown',
@@ -16,6 +16,7 @@ export default class Module {
 		this.name = name;
 		this.type = type;
 		this.mass = mass;
+		this.ship = ship;
 		this.id = id;
 		this.images = assets.modules[this.type][this.id];
 		// Fuel
@@ -32,6 +33,10 @@ export default class Module {
 		}
 	}
 
+	get com() {
+		return this.ship.getWorldPoint(...this.localCom);
+	}
+
 	get currentImage() {
 		if (this.type == 'thruster') {
 			return this.power > 0 ? this.images.on : this.images.off;
@@ -40,7 +45,7 @@ export default class Module {
 		}
 	}
 
-	get com() {
+	get localCom() {
 		return [this.x + 0.5, this.y + 0.5];
 	}
 }

js/world/ship.mjs

@@ -6,8 +6,14 @@ export default class Ship extends Body {
 	constructor(x, y) {
 		super(x, y, 0);
 
-		this.com = [0, 0];
+		this.localCom = [0, 0];
 		this.modules = new Set();
+		this.maxRadius = 0;
+	}
+
+	get com() {
+		let [lx, ly] = this.localCom;
+		return [this.x + lx, this.y + ly];
 	}
 
 	tick() {
@@ -18,7 +24,7 @@ export default class Ship extends Body {
 	}
 
 	addModule(x, y, properties, options) {
-		let module = new Module(x, y, {...properties, ...options});
+		let module = new Module(x, y, this, {...properties, ...options});
 		this.modules.add(module);
 		this.refreshShape();
 	}
@@ -30,24 +36,37 @@ export default class Ship extends Body {
 
 	refreshShape() {
 		let points = [];
-		this.modules.forEach(m => points.push([...m.com, m.mass]));
+		this.modules.forEach(m => points.push([...m.localCom, m.mass]));
 		this.mass = points.reduce((a, [,,b]) => a + b, 0);
-		this.com = points.reduce(([ax, ay], [bx, by, bm]) =>
+		this.localCom = points.reduce(([ax, ay], [bx, by, bm]) =>
 			[ax + bx * bm, ay + by * bm], [0, 0])
 			.map(x => x / this.mass);
-		window.q = points;
+		let [lx, ly] = this.localCom;
+		this.maxRadius = points.reduce((a, [bx, by]) =>
+			Math.max(Math.sqrt((bx - lx) ** 2 + (by - ly) ** 2), a), 0) + 1;
 	}
 
 	resolveCollisions() {
 		world.celestials.forEach(c => {
 			let dis = this.distanceTo(c);
-			if (dis < c.radius) {
-				this.approach(c, dis - c.radius);
-				this.halt();
+
+			if (dis < c.radius + this.maxRadius) {
+				this.modules.forEach(m => {
+					this.checkModuleCollision(m, c);
+				});
 			}
 		})
 	}
 
+	checkModuleCollision(module, body) {
+		let p = this.getWorldPoint(...module.localCom)
+		let dis = body.distanceTo({ com: p });
+		if (dis < body.radius + 0.5) {
+			this.approach(body, dis - (body.radius + 0.5));
+			this.halt();
+		}
+	}
+
 	applyThrust({ forward = 0, left = 0, right = 0, back = 0,
 		turnLeft = 0, turnRight = 0}) {
 		let turnForce = (turnRight - turnLeft) / 20;

js/world/spawn.mjs

@@ -16,13 +16,13 @@ export function player() {
 
 export function startPlanet() {
 	return celestial(0, 0, 40, {
-		density: 1,
+		density: 10,
 		type: 'green'
 	});
 }
 
 export function celestial(x, y, radius, params) {
-	let celestial = new Celestial(x, y, radius, params);
+	let celestial = new Celestial(x - radius, y - radius, radius, params);
 	world.celestials.add(celestial);
 	return celestial;
 }