attractors (reverse gravitational, single point)

let attrX;

let attrY;

let g=0.0000009

let particleCount=500

let particle=[];

let c=50;

let r;

let distance;

function setup() {

createCanvas(windowWidth,windowHeight);

attrX=width/2

attrY=height/2

for (let i=0;i<particleCount;i++) {

    r=random(50,250)

randomVector=createVector(0,r)

randomVector.rotate(random(TWO_PI))

let x = randomVector.x+attrX

let y = randomVector.y+attrY

particle[i]=new particles(x,y,cos(randomVector.heading()),PI/2)

}

colorMode(HSB)

background(0)

}

​

function draw() {

    colorMode(RGB,360,100,100,255)

    background(0,15)

    colorMode(HSB,360,100,100,0)

    fill(0)

    for (let i=0;i<particleCount;i++) {

    particle[i].move();

    particle[i].display();

    }

}

​

class particles {

 constructor(x,y,velMag,angle) {

this.pos=createVector(x,y)

this.vel=createVector(this.pos.x-attrX,this.pos.y-attrY)

this.vel.rotate(angle)

this.vel.setMag(velMag)

this.pastPos=createVector(0,0)

this.kill=0

 }

 move() {

this.pastPos.set(this.pos)

 this.accel=createVector(this.pos.x-attrX,this.pos.y-attrY)

 distance=dist(this.pos.x,this.pos.y,attrX,attrY)

 distance=distance*distance

 this.accel.setMag(-g*distance)

 this.vel.add(this.accel)

 this.pos.add(this.vel)

 }

 display() {

stroke(dist(this.pos.x,this.pos.y,attrX,attrY)+sin(frameCount/100)*100,98,this.vel.mag()*80)

    line(this.pos.x,this.pos.y,this.pastPos.x,this.pastPos.y)

}

}

​

​