int dropcount=1000;
Drop one=new Drop(10,10,10);
Drop[] drops=new Drop[dropcount];
int nowX, nowY;
int driftX, driftY;
int gap=20;
int repel=-1;
boolean reCol=false;
int c=0;



void setup(){
  size(1200,800);
  frameRate(30);
  nowY=width/2;
  nowY=height/2;
  for (int i=0; i<dropcount; i++){
    drops[i]=new Drop((int)random(width), (int)random(height), (int)random(height/3));
    //println(drops[i]);
  }
}

void draw(){
  background(0);
  driftX+=(nowX-driftX)/10;
  driftY+=(nowY-driftY)/10;
  for (int i=0; i<dropcount; i++){
    if(reCol) drops[i].reCol();
    drops[i].drawDrop();  
  }
  reCol=false;
}

void mouseDragged(){
  nowX=mouseX;
  nowY=mouseY;
}
  
void mouseClicked(){
  repel=-repel;
  reCol=true;
  c=(int)random(3);
}  

class Drop{
  int x, y, dlength;
  float angle=0;
  float a=0;
  float newa=0;
  float h=0;
  int col;
  int r=(int)random(200)+25;
  int g=(int)random(200)+25;
  int b=(int)random(200)+25;
  int em;
  
  Drop(int x_, int y_, int dlength_){
    x=x_;
    y=y_;
    dlength=dlength_;
  }

void reCol(){  
 if (c<1){
  r=(int)random(100)+125;
  g=(int)random(200)+25;
  b=(int)random(200)+25;
 }else if (c<2){
  g=(int)random(100)+125;
  b=(int)random(200)+25;
  r=(int)random(200)+25;

 }else{
  b=(int)random(100)+125;
  r=(int)random(200)+25;
  g=(int)random(200)+25;

 }
}

float hyp(float o, float a){
  return sqrt(o*o+a*a);  
}  
  
float angle(float mx,float my){
 float adj=mx-x;
 float opp=my-y;
 h=hyp(opp, adj);
 if(adj>0)
 {
   return asin(opp/h)+PI/2*repel;
 }else{
  return PI-asin(opp/h)+PI/2*repel;
  }
}


  
void drawDrop(){
  newa=angle(driftX, driftY);
  a+=(newa-a)/10;
  pushMatrix();
  ellipseMode(CORNER);
  translate(x,y);
  rotate(a);
  noStroke();
  em=0;
  //if (h<dlength){em=255; /*dlength-(int)h*/;}else{em=r;}
  fill(dlength+gap<h?r:255,dlength+gap<h?g:50,dlength+gap<h?b:50,100);
  ellipse(0,0,10,dlength+gap<h?dlength:h-gap);
  popMatrix();
}  
}