sclass ImageSurfaceScribbleTool extends ImageSurfaceMouseHandler {

  settable BasicStroke stroke = new BasicStroke(5);

  settable Color color = Color.black;

  settable bool enabled;

  Pt lastPt;

  event painted;

  event scribbleDone(Scribble scribble);

  Scribble scribble;

  *() {}

  *(ImageSurface is) { this.register(is); }

  public void mousePressed(MouseEvent evt) {

    if (evt.getButton() != MouseEvent.BUTTON1) ret;

    if (!enabled) ret;

    lastPt = getPt(evt);

    scribble = new Scribble(color, stroke.getLineWidth(), new L);

    drawPoint(lastPt);

  }

  public void mouseReleased(MouseEvent e) {

    mouseDragged(e);

    lastPt = null;

    scribbleDone(scribble);

    scribble = null;

  }

  public void mouseDragged(MouseEvent e) {

    if (lastPt == null) ret;

    Pt p = getPt(e);

    if (!eq(p, lastPt))

      drawLine(lastPt, p);

    lastPt = p;

    is.repaint(); // That's gonna be slow...

  }

  void drawPoint(Pt p) {

    drawLine(p, p);

  }

  void drawLine(Pt a, Pt b) {

    scribble?.addPoint(b);

    Graphics2D g = getImageSurface().getImage().createGraphics();

    g.setStroke(stroke);

    g.setColor(color);

    g.drawLine(a.x, a.y, b.x, b.y);

    g.dispose();

    painted();

  }

}