/// <summary>
/// Paint starting line candidate so that user knows where to start
/// </summary>
private void PaintStartingLineCandidate()
{
uint startingLineYCoordinate = GridLinePainter.GetMiddleGridRowYCoordinate(xMyCanvas);
uint startingLineXRightGridPoint = GridLinePainter.GetMiddleGridPointX(xMyCanvas);
double startingLineXRightCoordinate = startingLineXRightGridPoint * GridBackgroundHelper.gridDistance;
mStartingLineCandidateLeftPoint.X = 0.0;
mStartingLineCandidateLeftPoint.Y = startingLineYCoordinate;
mStartingLineCandidateRightPoint.X = startingLineXRightCoordinate;
mStartingLineCandidateRightPoint.Y = startingLineYCoordinate;
Line startingLineCandidate = new Line();
startingLineCandidate.Stroke = TrackBrushDefs.startingLineBrush;
startingLineCandidate.StrokeThickness = 3;
startingLineCandidate.X1 = mStartingLineCandidateLeftPoint.X;
startingLineCandidate.Y1 = mStartingLineCandidateLeftPoint.Y;
startingLineCandidate.X1 = mStartingLineCandidateRightPoint.X;
startingLineCandidate.Y2 = mStartingLineCandidateRightPoint.Y;
Canvas.SetZIndex(startingLineCandidate, ZIndexValues.startingLine);
xMyCanvas.Children.Add(startingLineCandidate);
}
/// <summary>
/// Get the track that was chosen and paint that
/// </summary>
/// <param name="e"></param>
protected async override void OnNavigatedTo(NavigationEventArgs e)
{
// first paint the track
int?trackNumber = e.Parameter as int?;
if (trackNumber != null)
{
try
{
if (trackNumber != LOAD_TRACK_NR)
{
// a predefined track was chosen, get this track
mActiveTrack = TrackProvider.GetTrack((uint)trackNumber);
}
else
{
// user chose "Load Track"
// FileBrowseDialog
string filePath = await MyFilePicker.LetUserPickFile2Open();
if (filePath != null)
{
try
{
// load track
mActiveTrack = await TrackLoader.LoadTrack(filePath);
}
catch (Exception)
{
MessageDialog dialog = new MessageDialog("Please choose another track file, because the selected file is invalid: "
+ Environment.NewLine + "'" + filePath + "'.", "Error");
await dialog.ShowAsync();
// an exception occurred, return to main page
Back2Main();
}
}
}
if (mActiveTrack != null)
{
mActiveTrack.PaintTrack(xMyCanvas.Children, xMyCanvas.Width, xMyCanvas.Height,
GridLinePainter.GetMiddleGridRowYCoordinate(xMyCanvas));
// highscore
SetHighscoreInGUI();
InitRace();
}
else
{
// loading track failed, navigate back to main
Back2Main();
}
}
catch (Exception)
{
MessageDialog dialog = new MessageDialog("Problem with loading the track", "Error");
await dialog.ShowAsync();
// an exception occurred, return to main page
Back2Main();
}
}
}