Flag of Ukraine - OpenProcessing

mySketch
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int a;
int b;
boolean direction;
​
void setup() {
  size(640, 360);
  colorMode(RGB, random(255));
  a = random(0);
  b = width;
  direction = true;
  frameRate(60);
}
​
void draw() {
  a++;
  if(direction == true){
    stroke(0, 0, random(255));
  } else {
    stroke(width-a);
  }
  fill(0, 0, 255); 
  rect(0, 0, a, height/2);
  
  b--;
  if(b < 0) {
    b = width;
  }
  if(direction == true) {
    stroke(255, 255, 0);
  } else {
    stroke(255, 255, 0);
  }
  fill(255, 255, 0);
  rect(b, height/2, a, height/2);
}