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acceleration

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nora 2021-06-17 17:06:33 +02:00
parent b754525595
commit 42ed986722
3 changed files with 25 additions and 12 deletions
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21
src/draw/classes/Particle.ts
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@ -6,24 +6,26 @@ import {CANVAS_HEIGHT, CANVAS_WIDTH} from "../../App";
const PARTICLE_SIZE = 5;
const PARTICLE_EDGE_REPULSION_FORCE = 0.1;
const FRICTION = 0.99;
const RANDOM_ACCELERATION = 2;
const FRICTION = -0.01;
const RANDOM_ACCELERATION = 0.5;
export default class Particle implements SimObject {
private _position: Vector;
private _velocity: Vector;
private _acceleration: Vector;
private readonly _mass: number;
private readonly _charge: number;
constructor(position: Vector, charge = 0, mass = 1) {
this._position = position;
this._velocity = new Vector();
this._acceleration = new Vector();
this._charge = charge;
this._mass = mass;
}
public applyForce(force: Vector) {
this._velocity = this._velocity.add(force.scaleInverse(this._mass));
this._acceleration = this._acceleration.add(force);
}
public draw(ctx: Ctx): void {
@ -31,11 +33,8 @@ export default class Particle implements SimObject {
}
public update(): void {
this._position = this._position.add(this._velocity);
this._velocity = this._velocity.scale(FRICTION);
// random movement
if (this._velocity.magnitude() < 0.1 && Math.random() > 0.4) {
if (this._acceleration.magnitude() < 1 && this._velocity.magnitude() < 0.2 && Math.random() > 0.4) {
this.applyForce(new Vector((Math.random() - 0.5) * RANDOM_ACCELERATION, (Math.random() - 0.5) * RANDOM_ACCELERATION));
}
@ -51,6 +50,14 @@ export default class Particle implements SimObject {
if (this._position.y < 50) {
this.applyForce(new Vector(0, PARTICLE_EDGE_REPULSION_FORCE));
}
this._velocity = this._velocity
.add(this._acceleration
.add(new Vector(this._velocity.x * FRICTION, this._velocity.y * FRICTION))
.scaleInverse(this._mass));
this._position = this._position.add(this._velocity);
this._acceleration = new Vector();
}
public get charge() {