Question

在应用程序上需要帮助，该应用程序即使在播放时也会在视频上绘制基本形状。我正在使用AXWindowsMediaPlayer控件来播放视频，并且还使用自定义面板在播放器控件上绘制形状。自定义面板是透明的。视频播放时可以顺畅绘制。但是当它出现时，每件事都出错了。视频上的绘图被删除。我怎么能克服这个问题？请帮忙。

Answer 1

我已经找到了如何做到这一点。这是WPF中使用Canvas的一种方式

private void buttonPlayVideo_Click(object sender, RoutedEventArgs e)
{
    Microsoft.Win32.OpenFileDialog dlg = new Microsoft.Win32.OpenFileDialog();
    dlg.Filter = "All Files|*.*";
    Nullable<bool> result = dlg.ShowDialog();
    if (result == true) {
        MediaPlayer mp = new MediaPlayer();
        mp.Open(new Uri(filename));
        VideoDrawing vd = new VideoDrawing();
        vd.Player = mp;
        vd.Rect = new Rect(0, 0, 960, 540);
        DrawingBrush db = new DrawingBrush(vd);
        canvas.Background = db;
        mp.Play();
    }
}

然后为Canvas创建鼠标事件并使用它绘制

    Point startPoint, endPoint;
    private void canvas_MouseDown(object sender, MouseButtonEventArgs e)
    {
        startPoint = e.GetPosition(canvas);
    }
    private void canvas_MouseUp(object sender, MouseButtonEventArgs e)
    {
        endPoint = e.GetPosition(canvas);

        Line myLine = new Line();
        myLine.Stroke = System.Windows.Media.Brushes.LightSteelBlue;
        myLine.X1 = startPoint.X;
        myLine.Y1 = startPoint.Y;
        myLine.X2 = endPoint.X;
        myLine.Y2 = endPoint.Y;
        myLine.HorizontalAlignment = HorizontalAlignment.Left;
        myLine.VerticalAlignment = VerticalAlignment.Center;
        myLine.StrokeThickness = 2;
        canvas.Children.Add(myLine);
    }

在视频C＃上绘制形状

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