Zoom mini map? - Printable Version

Code:
private void Page_Loaded(object sender, RoutedEventArgs e)

{

    ZoomPanel1.ZoomMode = Ab2d.Controls.ZoomPanel.ZoomModeType.Move;





    Canvas zoomPanelMiniMapCanvas;



    zoomPanelMiniMapCanvas = CreateMinimap(200);



    zoomPanelMiniMapCanvas.VerticalAlignment = VerticalAlignment.Center;

    zoomPanelMiniMapCanvas.HorizontalAlignment = HorizontalAlignment.Left;

    MainGrid.Children.Add(zoomPanelMiniMapCanvas);

}



private Canvas _zoomPanelMiniMapCanvas;

private Rectangle _zoomPanelMiniMapRectangle;



private Canvas CreateMinimap(int width)

{

    int height;

    Image zoomPanelImage;

    FrameworkElement content;





    content = ZoomPanel1.Content as FrameworkElement;



    if (content == null)

        return _zoomPanelMiniMapCanvas;



    // Adjust height for aspect ratio

    height = Convert.ToInt32(width * content.ActualHeight / content.ActualWidth);



    

    _zoomPanelMiniMapCanvas.Width = width;

    _zoomPanelMiniMapCanvas.Height = height;





    RenderTargetBitmap bmp = new RenderTargetBitmap(width, height, 96, 96 /* standard WPF dpi setting 96 */, PixelFormats.Pbgra32);

    bmp.Render(content);



    zoomPanelImage = new Image();

    zoomPanelImage.Source = bmp;



    _zoomPanelMiniMapRectangle = new Rectangle();

    _zoomPanelMiniMapRectangle.Stroke = Brushes.Red;



    _zoomPanelMiniMapCanvas.Children.Add(zoomPanelImage);

    _zoomPanelMiniMapCanvas.Children.Add(_zoomPanelMiniMapRectangle);



    UpdateMiniMapRectangle(ZoomPanel1.Viewbox);



    ZoomPanel1.ViewboxChanged += new Ab2d.Controls.ZoomPanel.ViewboxChangedRoutedEventHandler(ZoomPanel1_ViewboxChanged);



    return _zoomPanelMiniMapCanvas;

}



void ZoomPanel1_ViewboxChanged(object sender, Ab2d.Controls.ViewboxChangedRoutedEventArgs e)

{

    // NOTE that if ZoomPanel is animated, the ZoomPanel1.Viewbox is not yet changed to the final value because the animation is just started

    // The e.NewViewboxValue is already the final value

    UpdateMiniMapRectangle(e.NewViewboxValue);

}



private void UpdateMiniMapRectangle(Rect ZoomPanelviewbox)

{

    Canvas.SetLeft(_zoomPanelMiniMapRectangle, ZoomPanelviewbox.X * _zoomPanelMiniMapCanvas.Width);

    Canvas.SetTop(_zoomPanelMiniMapRectangle, ZoomPanelviewbox.Y * _zoomPanelMiniMapCanvas.Height);



    _zoomPanelMiniMapRectangle.Width = ZoomPanelviewbox.Width * _zoomPanelMiniMapCanvas.Width;

    _zoomPanelMiniMapRectangle.Height = ZoomPanelviewbox.Height * _zoomPanelMiniMapCanvas.Height;

}