Created
October 25, 2019 20:46
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| var Ball = function Ball() { | |
| this.loc = createVector(width / 2, height / 2); | |
| this.vel = createVector(); | |
| this.acc = createVector(); | |
| this.col = color(random(55, 200)); | |
| this.sz = random(10, 25); | |
| this.mass = this.sz * 1.5; | |
| } | |
| Ball.prototype.addForce = function addForce(force) { | |
| var f = p5.Vector.div(force, this.mass); | |
| this.acc.add(f); | |
| } | |
| Ball.prototype.move = function move() { | |
| this.vel.add(this.acc); | |
| this.vel.limit(1); | |
| this.loc.add(this.vel); | |
| this.acc.mult(0); | |
| } | |
| Ball.prototype.keepInView = function keepInView() { | |
| this.loc.x = constrain(this.loc.x, 0, width); | |
| this.loc.y = constrain(this.loc.y, 0, height); | |
| } | |
| Ball.prototype.draw = function draw() { | |
| fill(this.col); | |
| ellipse(this.loc.x, this.loc.y, this.sz, this.sz); | |
| } | |
| var Arrow = function Arrow(w) { | |
| this.wind = w; | |
| var fake = this.wind.copy(); | |
| fake.y *= -1; | |
| this.loc = p5.Vector.sub(fake, createVector()); | |
| this.loc.normalize() | |
| } | |
| Arrow.prototype.setWind = function setWind(w) { | |
| this.wind = w.copy(); | |
| } | |
| Arrow.prototype.draw = function draw() { | |
| push(); | |
| translate(width / 2 + this.loc.x, height / 2 + this.loc.y); | |
| fill(255); | |
| rotate(atan2(this.loc.x, this.loc.y)); | |
| ellipse(this.loc.x, this.loc.y, 10, 10) | |
| triangle( | |
| this.loc.x + 5, this.loc.y + 0, | |
| this.loc.x - 5, this.loc.y + 0, | |
| this.loc.x + 0, this.loc.y - 10 | |
| ); | |
| triangle( | |
| 0, -width / 2 + width / 64, | |
| 10, -width / 2 + width / 64, | |
| 5, -width / 2 | |
| ); | |
| pop(); | |
| var fake = this.wind.copy(); | |
| fake.y *= -1; | |
| fake.normalize(); | |
| var to = p5.Vector.sub(fake, createVector()); | |
| this.loc.lerp(to, 0.02); | |
| } | |
| var Wind = function Wind() { | |
| this.wind = null; | |
| this.update(0); | |
| } | |
| Wind.prototype.update = function update(a) { | |
| this.wind = p5.Vector.fromAngle(a); | |
| } | |
| Wind.prototype.get = function get() { | |
| return this.wind; | |
| } | |
| var balls = []; | |
| var wind = null; | |
| function setup() { | |
| const c = createCanvas(685, 685); | |
| c.parent("sample"); | |
| balls = new Array(2).fill(0).map(() => new Ball()); | |
| wind = new Wind() | |
| arrow = new Arrow(wind.get()); | |
| noStroke(); | |
| } | |
| function draw() { | |
| background(25); | |
| if (frameCount % 100 === 0) { | |
| var windDir = random(0.0, 1.0) * 2 * Math.PI; | |
| wind.update(windDir); | |
| arrow.setWind(wind.get()); | |
| } | |
| balls.forEach((b) => { | |
| b.addForce(wind.get()); | |
| b.move(); | |
| b.keepInView(); | |
| b.draw(); | |
| }) | |
| arrow.draw(); | |
| } |
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