AmplitudeSlider.java 文件源码

private void setAmplitude( Point mousePoint ) {
    double localY = 0;
    try {
        AffineTransform transform = getNetTransform();
        transform.inverseTransform( mousePoint, _somePoint /* output */ );
        localY = _somePoint.getY();
    }
    catch ( NoninvertibleTransformException e ) {
        e.printStackTrace();
    }
    localY = -localY; // +Y is up
    double amplitude = MAX_AMPLITUDE * ( localY / ( _maxSize.height / 2.0 ) );
    amplitude = MathUtil.clamp( -MAX_AMPLITUDE, amplitude, +MAX_AMPLITUDE );
    _harmonic.setAmplitude( amplitude );

    fireChangeEvent();
}