int i;
int direction;

int j;


void setup(){

  size(300,300);
  direction = 1;
  
  }
  
void loop(){

background(0,0,0);

//random(i/10,j/10);

fill(j+i,0,i-j);//color
rect(300-j*i,i,j,300+i+j); //graphSize
  //line(i,i+j,i+j,100-j);

//  line(0,i,300,i);
      i += direction;
  
//  i +=1;
  if(i > 100 ){
  direction = -1;
    }
    
    if(i < 0 ){
  direction = 1;
    }
    
  j +=10;
     if(j >600 ){
  j =0;
    }

}