class Button {

  public static final int MODE_TRIGGER = 0;
  public static final int MODE_TOGGLE = 1;
  private int MODE = MODE_TRIGGER;

  private boolean ON = false;
  private boolean lastON = false;

  private float x=0, y=0;
  private float r=0;
  private color c;
  private boolean over = false;
  private boolean lastMousePressed = false;

  Button() {
  }

  public void setScreenPos(float _x, float _y) {
    x = _x;
    y = _y;
  }

  public void setScreenSize(float _r) {
    r = _r;
  }

  public void setScreenColor(color _c) {
    c = _c;
  }

  public boolean buttonOnFlankEvent() {
    return (!lastON&&ON);
  }

  public boolean buttonOffFlankEvent() {
    return (lastON&&!ON);
  }
  
  public void update() {
    lastON = ON;
    if (MODE==MODE_TRIGGER) {
      if (keyPressed&&key==' ') {
        ON = true;
      } else {
        ON = false;
      }
    } else if (MODE==MODE_TOGGLE) {
      ON = !ON;
    }
  }

  public void draw() {
    ellipseMode(CENTER_RADIUS);
    stroke(0,0,0);
    fill(red(c),green(c),blue(c),100+(ON?150:0));
    ellipse(x,y,r,r);

    if (over) {
      noFill();
      ellipse(x,y,r+0.5,r+0.5);
    }
  }

  private boolean mouseDownEvent() {
    return (!lastMousePressed&&mousePressed);
  }

  private boolean mouseUpEvent() {
    return (lastMousePressed&&!mousePressed);
  }

}