int vectorCount=1000;

PVector a[]=new PVector[vectorCount];
PVector a2[]=new PVector[vectorCount];
PVector asp[]=new PVector[vectorCount];
PVector acc[]=new PVector[vectorCount];
PVector mou=new PVector();

int uma=1;

float mouMul=0.3;

void setup() {
  size(1000, 600);
  for (int x=0; x<vectorCount; x++) {
    a[x]=new PVector(random(width), random(height));

    asp[x]=new PVector(0, 0);

    acc[x]=new PVector(0, 0);

    a2[x]=a[x].copy();
  }
}

void draw() {
  fill(0, 255);
  noStroke();
  rect(0, 0, width, height);
  for (int x=0; x<vectorCount; x++) {
   
   
    a2[x]=a2[x].sub(a[x]);
    a2[x]=a2[x].mult(6);
   
    //a2[x].normalize();
    //println(a2[x]);
   
   
    mou.x=mouseX;
    mou.y=mouseY;
    acc[x]=mou.sub(a[x]).normalize();
    asp[x].add(acc[x].mult(mouMul));
    asp[x].limit(50);
    //println(acc);
    a[x].add(asp[x].mult(0.99));
    a[x].add(new PVector(0,10));
    fill(255);
    pushMatrix();
    //translate(a[x].x, a[x].y);
    translate(round(a[x].x/uma)*uma, a[x].y);
    ellipse(0,0, 5, 5);
    stroke(uma*3,0,255);
    strokeWeight(1);
    line(0,0,asp[x].x*1,asp[x].y*1);
    noStroke();
   
    popMatrix();

    if (a[x].x<0||a[x].x>width) {
      acc[x].x=-acc[x].x;
      asp[x].x=-asp[x].x;
    }

    if (a[x].y<0||a[x].y>height) {
      acc[x].y=-acc[x].y;
      asp[x].y=-asp[x].y;
    }
    mou.x=mouseX;
    mou.y=mouseY;
   
    if(a[x].dist(mou)>1.5*width){
      a[x]=new PVector(mouseX,mouseY);
      acc[x]=new PVector(random(-2,2),random(-2,2));
      asp[x]=new PVector(random(-2,2),random(-2,2));
    }
    a2[x]=a[x].copy();
   
    //for(int y=x;y<vectorCount;y++){
    //  if(a[y].dist(a[x])<2){
    //    acc[y].x=-acc[y].x;
    //    asp[y].x=-asp[y].x;
    //    acc[y].y=-acc[y].y;
    //    asp[y].y=-asp[y].y;
    //  }
    //}

  }
 
  //if(frameCount%1==0)uma=int(random(2,40));
 
}

void keyPressed(){
  if(key=='q'){
    uma+=10;
  }
 
  if(key=='a'){
    uma-=10;
    if(uma<5)uma=5;
  }
 
  }
 

void mousePressed() {
 
  mouMul=-0.3;
}

void mouseReleased() {
  mouMul=0.3;
}