Drawing.pde

ArrayList<V> vs = new ArrayList<V>();
ArrayList<V> vsBin = new ArrayList<V>();
float minD = 10;
float maxD = 1920/2;
float t;
float hue;

void setup() {
  fullScreen(P2D);
  background(0);
  noSmooth();
  colorMode(HSB, 1, 1, 1, 1);
}

void mouseReleased() {
  vs.add(new V(mouseX, mouseY));
  if(isPointInRect(mouseX, mouseY, 0,0,60,60)){
    reset();
  }
}

void mouseDragged() {
  vs.add(new V(mouseX, mouseY));
}

void draw() {
  t = radians(frameCount*.05);
  hue = t%1;
  /*
  if (frameCount % 4 == 0) {
    rectMode(CORNER);
    blendMode(SUBTRACT);
    noStroke();
    fill(0.004);
    rect(0, 0, width, height);
    blendMode(REPLACE);
  }
  
  for(V v : vs){
    if(v.birth + v.lifespan < frameCount){
      vsBin.add(v);
    }
  }
  vs.removeAll(vsBin);
  vsBin.clear();
  
  
  while(vs.size()>500){
    vs.remove(0);
  }
  */
  
  noStroke();
  fill(hue,1,1,1);
  rect(10,10,50,50);
  
  beginShape(LINES);
  noFill();
  for (V v : vs) {
    if (v.neighboursUnknown) {
      v.findNeighbours();
      v.neighboursUnknown = false;
    }
  }
  endShape();
}

void reset(){
  vs.clear();
  background(0);
}

class V {
  boolean neighboursUnknown = true;
  PVector pos;
  ArrayList<V> ns = new ArrayList<V>();
  int birth = frameCount;
  int lifespan = 600;
  
  V(float x, float y) {
    pos = new PVector(x, y);
  }

  void findNeighbours() {
    strokeWeight(3);
    stroke(hue,1,1,1);
    vertex(pmouseX, pmouseY);
    vertex(pos.x, pos.y);
    strokeWeight(1);
   
    for (V v : vs) {
      if (v.equals(this)) { 
        continue;
      }
      float d = dist(pos.x, pos.y, v.pos.x, v.pos.y);
      if (d > minD && d < maxD) {
        float dN = map(d, minD, maxD, 0, 1);
        if(abs(randomGaussian()) < dN*15){
          continue;
        }
        stroke(hue, 1, 1, 1-dN);
        vertex(v.pos.x, v.pos.y);
        vertex(pos.x, pos.y);
        
      }
    }
  }
}

boolean isPointInRect(float px, float py, float rx, float ry, float rw, float rh) { 
  return px >= rx && px <= rx + rw && py >= ry && py <= ry + rh;
}