java如何用Processing生成马赛克风格的图像

PImage pic;
int spacing=5;

void setup(){
 pic=loadImage("steve.jpeg");
 size(706, 644);
}

void draw(){
 for (int x=spacing; x<width; x+=spacing) {
 for (int y=spacing; y<height; y+=spacing) {
  color c=pic.get(x, y);
  fill(c);
  noStroke();
  ellipse(x, y, spacing*0.6, spacing*0.6);
 }
 }
 save("image_2.jpg");
}