Home › Forums › Software Development › How to convert EyeX X & Y into Canvas.X, Canvas.Y positions?

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  • 29/01/2016 at 12:38 #4209
    TRO
    Participant

    I am building a very simple WPF app to show the position on a Canvas of both eyes.

    I have 2 ellipse, one for each eye on a Canvas.

    Obviously the EyeX coordinates don’t map directly into Canvas.X and Canvas.Y positions so how would I achieve this?

    thanks

    29/01/2016 at 12:45 #4210
    TRO
    Participant

    My code so far:

        public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();

            this.Loaded += MainWindow_Loaded;
            this.Closing += (s, e) => { this.EyePositionDataStream.Dispose(); };
        }

        private EyeXFramework.EyePositionDataStream EyePositionDataStream { get; set; }

        private void MainWindow_Loaded(object sender, RoutedEventArgs routedEventArgs)
        {
            this.EyePositionDataStream = (Application.Current as App).WpfEyeXHost.CreateEyePositionDataStream();

            this.EyePositionDataStream.Next += (s, e) =>
            {
                txtLeftEye.Text = string.Format("LEFT: X: {0:0.00}, Y: {1:0.00}", e.LeftEye.X, e.LeftEye.Y);
                txtRightEye.Text = string.Format("RIGHT: X: {0:0.00}, Y: {1:0.00}", e.RightEye.X, e.RightEye.Y);

                leftEye.SetValue(Canvas.LeftProperty, e.LeftEye.X);
                leftEye.SetValue(Canvas.TopProperty, e.LeftEye.Y);

                rightEye.SetValue(Canvas.LeftProperty, e.RightEye.X);
                rightEye.SetValue(Canvas.TopProperty, e.RightEye.Y);
            };
        }
    }
    23/02/2016 at 16:10 #4524
    Denny [Tobii]
    Member

    Hi,

    I would use the normalized eye coordinates if you want to visualize the eye positions. The positions are in the 0-1 range, so you will need to scale they eyes yourself in the canvas.

                stream.Next += (s, e) =>
            {
                Debug.WriteLine("EyePos = {0} {1} {2} {3}", 
                e.LeftEyeNormalized.X,
                e.LeftEyeNormalized.Y,
                e.RightEyeNormalized.X,
                e.RightEyeNormalized.Y);
            };

    Hope it helps,

    Denny

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