WPF

Ranger49 wrote:

should the code to compute the fractal be put in the DoWork method, where the progressbar is in the ProgressChanged method?

Mark Salsbery
Microsoft MVP - Visual C++

public partial class Window1 : Window
{
    BackgroundWorker bw = new BackgroundWorker();

    public Window1()
    {
        InitializeComponent();

        bw.WorkerReportsProgress = true;
        bw.DoWork += new DoWorkEventHandler(bw_DoWork);
        bw.ProgressChanged += new ProgressChangedEventHandler(bw_ProgressChanged);
    }

    private void button1_Click(object sender, RoutedEventArgs e)
    {
        if (!bw.IsBusy)
            bw.RunWorkerAsync();
    }

    void bw_DoWork(object sender, DoWorkEventArgs e)
    {
        <code>// Background thread - no UI element access allowed here!</code>

        LineDescriptor ld = new LineDescriptor();

        for (int i = 0; i < 100; i++)
        {
            Random rnd = new Random();
            //Pen p = new Pen();
            byte red, green, blue;

            red = (byte)rnd.Next(0, 255);
            green = (byte)rnd.Next(0, 255);
            blue = (byte)rnd.Next(0, 255);
            Color col = new Color();
            col.R = red;
            col.G = green;
            col.B = blue;
            col.A = 255;
            ld.Color = col;

            ld.X2 = rnd.Next(0, (int)canvas1.ActualWidth);
            ld.Y2 = rnd.Next(0, (int)canvas1.ActualHeight);
            ld.X1 = rnd.Next(0, (int)canvas1.ActualWidth);
            ld.Y1 = rnd.Next(0, (int)canvas1.ActualHeight);

            bw.ReportProgress(i + 1, ld); <code>//<-- bug fix - added 1 to i</code> :)

            Thread.Sleep(25);
        }
    }

    void bw_ProgressChanged(object sender, ProgressChangedEventArgs e)
    {
        <code>// UI thread - UI element access allowed here!</code>

        LineDescriptor ld = e.UserState as LineDescriptor;

        Line line = new Line();
        line.X1 = ld.X1;
        line.Y1 = ld.Y1;
        line.X2 = ld.X2;
        line.Y2 = ld.Y2;
        line.Stroke = new SolidColorBrush(ld.Color);
        line.StrokeThickness = 1.0;

        canvas1.Children.Add(line);

        progressbar1.Value = e.ProgressPercentage;
    }
}


class LineDescriptor
{
    public Color Color { get; set; }
    public double X1 { get; set; }
    public double Y1 { get; set; }
    public double X2 { get; set; }
    public double Y2 { get; set; }
}

Mark Salsbery
Microsoft MVP - Visual C++

DahrkDaiz wrote:

Any advice?

ravimori wrote:

for anything you do using keyboard or mouse input at that time make the value of 'xyz' to 0..