- (void) _render:(NSTimer*)timer

{

    [self renderWithEvent:nil];

}

- (void) renderWithEvent:(NSEvent*)event

{

    NSTimeInterval  time = [NSDate timeIntervalSinceReferenceDate];

    NSPoint             mouseLocation;

    NSMutableDictionary  *arguments;

    if(_startTime == 0)// 1

    {

        _startTime = time;

        time = 0;

    }

    else

        time -= _startTime;

    mouseLocation = [NSEvent mouseLocation];// 2

    mouseLocation.x /= _screenSize.width;// 3

    mouseLocation.y /= _screenSize.height;// 4

    arguments = [NSMutableDictionary dictionaryWithObject:[NSValue // 5

                    valueWithPoint:mouseLocation]

                    forKey:QCRendererMouseLocationKey];

    if(event)// 6

        [arguments setObject:event forKey:QCRendererEventKey];

    // 入力ポート値を設定するコードをここに記述する // 7

    if(![_renderer renderAtTime:time arguments:arguments])// 8

                NSLog(@"Rendering failed at time %.3fs", time);

    // 出力ポート値を取得するコードをここに記述する // 9

    [_openGLContext flushBuffer];// 10

}