float x, y, w, h;
int randomBirds;

void setup(){
  size(820,600);
  reset();
}
void reset(){
  randomBirds= int ( random( 3,10 ) );
  x= 0;
  y= random( 100,500 );
  w= random( 10,70 );
  h= w/4;
}
void draw(){
  background( 150,150,250 );
  fill( 50,30,150 );
  flock( randomBirds, x,y, w,h );
  x = x+20;
}
void flock( int randomBirds, float x, float y, float w, float h ){
  float xx= x;
  float ww= w;
  float hh= h * 3;
  bird( xx,y,w,h );
  xx= xx - 2*w;
  for (int p=1; p<randomBirds; p++ ){
      bird( xx,y-hh, w,h );
      bird( xx,y+hh, w,h ); 
      xx=  xx - 2*w;     
      ww  *= 0.79;             
      hh = hh + h*3;
  }
}  
void bird( float x, float y, float w, float h ){
  fill(255, 180, 63);
  triangle( x,y, x-w,y-h, x-w,y+h );
  if ( x > width 500 && x-w > width+500 ){
  reset();
  }
}
void keyPressed(){
  if (key == 'r') reset();
  if (key == 'q') exit();
}