I figured I should start learning Xaml, since it is used in WPF and Silverlight. I found this nice tutorial on Code Project: http://www.codeproject.com/KB/silverlight/SilverlightsOut.aspx on how to make a game as a introduction to silverlight.
I however first decided to make it a WPF application to try my hand at that first. One of the first things I learned was about the error:
The calling thread cannot access this object because a different thread owns it.
In the original he had it setup to use the HTMLtimer use the Tick event to move the background of stars like so:
System.Windows.Browser.HtmlTimer timer =
new System.Windows.Browser.HtmlTimer();
timer.Interval = 1;
timer.Enabled = true;
timer.Tick += new EventHandler(timer_Tick);
I figured that I would need to change this to use the Timer class:
Timer timer_error = new Timer();
timer_error.Interval = 1.0;
timer_error.Enabled = true;
timer_error.Start();
timer_error.Elapsed += new ElapsedEventHandler(timer_error_Elapsed);
Then I got the error, which I then found:
"The .NET Framework 2.0 supports several timer objects, among them System.Timers.Timer, System.Threading.Timer, and System.Windows.Forms.Timer. However, these timers cannot be used directly by a WPF application since they run in a different thread than the one running the WPF UI."
(source: http://blogs.msdn.com/wpfsdk/archive/2006/06/23/Animating-Traffic-Map-Image-Data.aspx)
The solution is to use the System.Windows.Threading.DispatcherTimer like so:
System.Windows.Threading.DispatcherTimer timer = new DispatcherTimer();
timer.Interval = new TimeSpan(0,0,0,0,85);
timer.Start();
timer.Tick += new EventHandler(timer_Tick);
I also had to change little things through out the program to get it to work, such as:
void timer_Tick(object sender, EventArgs e)
{
double currentLeft = (double)background.GetValue(Canvas.LeftProperty);
// get current left position of background
if (currentLeft <= 0)
{
// move background pixels over
background.SetValue(Canvas.LeftProperty, currentLeft + 2);
}
else
{
// reset backgrounds position
background.SetValue(Canvas.LeftProperty, currentLeft - 340);
//instead of
background.SetValue(Canvas.LeftProperty, -340);
}
}
I still have lots to learn. Currently I'm still adding more functionality to the app. I'm thinking that I should add a "restart" and make a auto-solve.
