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();
  }
}