fiddle with the polygon - OpenProcessing

mySketch
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//PVector
ArrayList < PVector > positions = new ArrayList();
color myColor;
​
void setup() {
  fullScreen();
  myColor = color(119, 128, 166);
}
​
void draw() {
  background(56, 61, 84);
  stroke(82, 89, 117);
  fill(myColor);
  strokeWeight(5);
  beginShape();
​
​
  for (PVector eachPoint: positions) {
    eachPoint.x += random(-5, 5);
    eachPoint.y += random(-5, 5);
    vertex(eachPoint.x, eachPoint.y);
  }
​
  endShape(CLOSE);
}
​
​
void mouseClicked() {
  positions.add(new PVector(mouseX, mouseY));
}
​
void keyPressed() {
  if (key == 'z') {
    positions.remove(positions.size() - 1);
  }
  //if (key == ' ') {
  //myColor = color(random(0,255),random(0,255),random(0,255));
  //}
  if (key == 'r') {
    myColor = color(255, 117, 117);
  }
  if (key == 'b') {
    myColor = color(117, 170, 255);
  }
​
  if (key == 'g') {
    myColor = color(143, 255, 176);
  }
}