float x,y,dir,speed;
float dirD,speedD;
int state,stateCnt;
int SPEEDUP=0,STOP=1,TURNING=2;

void setup() {
  size(300,300);
  x=width/2;
  y=height/2;
  dir=random(360);
  speed=0;
  rectMode(CENTER_DIAMETER);
  
  state=STOP;
  stateCnt=30;
  framerate(30);
}

void loop() {
//  background(200);
  
  stateCnt--;
  if(stateCnt==0) {
    dirD=0;
    speedD=0;
    
    if(state==STOP) {
      state=SPEEDUP;
      stateCnt=(int)random(50,100);
      speedD=random(2,5);
      speedD=(speedD-speed)/(float)stateCnt;
      dirD=random(-2,2);
    }
    else if(state==SPEEDUP) {
      if(random(100)>50) {
        state=TURNING;
      }
      else {
        state=STOP;
        speed=0;
      }
        
      stateCnt=(int)random(20,40);
    }
    else if(state==TURNING) {
      state=STOP;
      speed=0;
      stateCnt=(int)random(20,40);
    }
        
  }
  
  if(state==TURNING) {
    dirD+=random(-1,1);
    if(dirD>6) dirD=6;
    else if(dirD<-6) dirD=-6;
  }
  
  dir+=dirD;
  speed+=speedD;  
  
  float mult=mouseX;
  mult=mult/(float)width;
  mult*=2+0.1; // mult=mult*2;
  
  x+=cos(radians(dir))*speed*mult;
  y+=sin(radians(dir))*speed*mult;  
  
  rect(x,y, 10,10);
  rect(width-x,height-y, 10,10);
  
  if(x<0) x=width;
  else if(x>width) x=0;
  if(y<0) y=height;
  else if(y>height) y=0;
}