private void btnForward_Click(object sender, RoutedEventArgs e)
{
try
{
history = m_biz.HistForward();
//Getting the coordinates from the history
ZoomValue = history.zoom;
acrossX = history.x;
downY = history.y;
//Loads the tile but doesn't record in the history
LoadTile(false);
}
//If server is not running
catch (CommunicationObjectFaultedException)
{
MessageBox.Show("Error: Cannot connect to the server. Please try again later!");
}
//If user haven't navigate yet to record history anf then tries to view history
catch (NullReferenceException)
{
MessageBox.Show("Error: Please start navigating to record the history!");
}
}
//loads the image tile
private void load_Image(bool addToHist)
{
byte[] bitmap;
try
{
//calls load tile method from server
bitmap = m_tmBiz.LoadTile(zoom, x, y);
//open new memroy stream to convert to jpeg
MemoryStream memStream = new MemoryStream(bitmap);
//decodes memroy stream to a jpeg image
JpegBitmapDecoder decoder = new JpegBitmapDecoder(memStream, BitmapCreateOptions.None, BitmapCacheOption.None);
BitmapFrame bitmapFrame = decoder.Frames[0];
//sets the image source to the frame
imgTile.Source = bitmapFrame;
}
catch (System.ServiceModel.EndpointNotFoundException)
{
Console.WriteLine("Server is not on!");
}
catch (System.ServiceModel.CommunicationObjectFaultedException)
{
Console.WriteLine("Exception caught");
}
catch (Exception e2)
{
Console.WriteLine(e2);
}
if (addToHist)
{
//adds for browse history
HistEntry hAdd = new HistEntry(x, y, zoom);
try
{
m_tmBiz.AddHistEntry(hAdd);
}
catch (Exception) { }
}
}
/// <summary>
/// IvwHistory_SelectionChanged
/// does nothing yet
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void IvwHistory_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
m_entry = (HistEntry)e.AddedItems[0];
}
public DisplayHistory(BrowseHistory hist)
{
m_history = hist;
m_entry = null;
InitializeComponent();
}
