Add rotation view and path prediction toggles

js/world/tracer.mjs

@@ -0,0 +1,51 @@
+import Body from './body.mjs';
+import {modules} from '../data.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 default class Tracer extends Body {
+	constructor(ship) {
+		super(...ship.pos, 0.1);
+
+		this.ship = ship;
+		this.path = [];
+	}
+
+	run(distance) {
+		this.path = [];
+		[this.x, this.y] = this.ship.com;
+		[this.xvel, this.yvel] = [this.ship.xvel, this.ship.yvel];
+		let dis = 0;
+		let last = this.pos;
+		let factor = 5;
+
+		for (let i = 0; dis < distance; i++) {
+			if (this.tickPath(factor)) break;
+			this.path.push(this.pos);
+
+			if (i % 10 === 0) {
+				let [lx, ly] = last;
+				dis += Math.sqrt((this.x - lx) ** 2 + (this.y - ly) ** 2);
+				last = this.pos;
+			}
+
+			if (i > distance * 5) break;
+		}
+
+		[this.x, this.y] = this.ship.com;
+	}
+
+	tick() {
+		this.run(100);
+	}
+
+	tickPath(speed) {
+		this.tickMotion(speed);
+		this.tickGravity(celestials, speed);
+		return !!this.getCelestialCollision(celestials);
+	}
+}