arrow

PImage arrow;
int edge = 40, sz = 25, frms = 90;
float theta;

void setup() {
  size(540, 540);
  arrow = loadImage("arrow.png");
  arrow.resize(sz, 0);
  imageMode(CENTER);
}

void draw() {
  background(200);
  for (int x=edge+sz; x<width-edge; x += sz*2) {
    for (int y=edge+sz; y<height-edge; y+= sz*2) {
      float distance = dist(x, y, width/2, height/2);
      float r = map(distance, 0, sqrt(sq(width/2)+sq(height/2)), 0, HALF_PI);
      pushMatrix();
      translate(x, y);
      rotate(theta+r);
      image(arrow, 0, 0);
      popMatrix();
    }
  }
  textAlign(RIGHT);
  fill(0, 150);
  text("p5art.tumblr.com", width-60, height-10);
  if (frameCount<=frms) saveFrame("image-###.gif");
  theta += TWO_PI/frms;
}