sclass JAmplitudeGraph extends JComponent {

  float[] values;

  public void paint(Graphics g) {

    int w = getWidth(), h = getHeight();

    fillRect(g, 0, 0, w, h, getBackground());

    float[] values = this.values;

    if (empty(values)) ret;

    Color fg = getForeground();

    double factor = doubleRatio(l(values), w);

    for x to w: {

      int i1 = min(l(values)-1, ifloor(x*factor));

      int i2 = max(i1+1, ifloor((x+1)*factor));

      float val = 0;

      for (int i = i1; i < i2; i++) val = max(val, values[i]);

      int y = iround(val*h);

      fillRect(g, x, h-y, 1, y, fg);

    }

  }

  void setValues(float[] values) {

    this.values = values;

    repaint();

  }

}