Balls, balls, balls,again!!!MOVING

float x=30;

float y = 100;

float ys = 0.01;

int i;

void setup(){

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  size(300,452);

  smooth();

 }

 void draw(){

    PImage a;

   a=loadImage("a.jpeg");

   image(a,0,0);

   for(int i=0; i < width - 30; i+=30){

    for (int j=0; j<height -30; j+=30){ 

   float colorValue=map(i,0,600,0,300);

   fill(100-colorValue,200-colorValue,255-colorValue);

   ellipse(x+i,y+j,20,20);

   y = y + ys; 

   if(y > 462 || y <= 10){

   ys = -ys; 

     }   

    }

  }

}

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