Step 2 of 4: Adding Code

In this step, you will add code to the MainPage.xaml.cs file.

Right-click the MainPage.xaml page and select View Code from the list. The MainPage.xaml.cs should open.

Add the following code to the class declaration:

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C1VectorLayer vl; Random rnd = new Random(); C1VectorPlacemark current = null; Point offset = new Point();

Add the following code below the InitializeComponent() method, within the MainPage() constructor. This will change the map source, add a C1VectorLayer, and create random coordinates:

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maps.Source = new VirtualEarthHybridSource(); vl = new C1VectorLayer(); maps.Layers.Add(vl); maps.RightTapped += maps_RightTapped; for (int i = 0; i < 10; i++) { // create random coordinates Point pt = new Point(-80 + rnd.Next(160), -80 + rnd.Next(160)); AddMark(pt); }

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maps.Source = new VirtualEarthHybridSource();
            vl = new C1VectorLayer();
            maps.Layers.Add(vl);
            maps.RightTapped += maps_RightTapped;

            for (int i = 0; i < 10; i++)
            {
                // create random coordinates
                Point pt = new Point(-80 + rnd.Next(160), -80 + rnd.Next(160));
                AddMark(pt);
            }

The code that follows should be inserted after the closing curly bracket of the MainPage() constructor. This code will add a RightTapped event handler and an AddMark() method:

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void maps_RightTapped(object sender, RightTappedRoutedEventArgs e) { AddMark(maps.ScreenToGeographic(e.GetPosition(maps))); } void AddMark(Point pt) { Color clr = Utils.GetRandomColor(128, 192); C1VectorPlacemark mark = new C1VectorPlacemark() { GeoPoint = pt, Label = new TextBlock() { RenderTransform = new TranslateTransform() { Y = -5 }, IsHitTestVisible = false, Text = (vl.Children.Count + 1).ToString() }, LabelPosition = LabelPosition.Top, Geometry = Utils.CreateBaloon(), Stroke = new SolidColorBrush(Colors.DarkGray), Fill = new SolidColorBrush(clr), }; mark.PointerPressed += mark_PointerPressed; maps.PointerMoved += mark_PointerMoved; mark.PointerReleased += mark_PointerReleased; vl.Children.Add(mark); mark.DoubleTapped += mark_DoubleTapped; }

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void maps_RightTapped(object sender, RightTappedRoutedEventArgs e)
        {
            AddMark(maps.ScreenToGeographic(e.GetPosition(maps)));
        }

        void AddMark(Point pt)
        {
            Color clr = Utils.GetRandomColor(128, 192);
            C1VectorPlacemark mark = new C1VectorPlacemark()
            {
                GeoPoint = pt,
                Label = new TextBlock()
                {
                    RenderTransform = new TranslateTransform() { Y = -5 },
                    IsHitTestVisible = false,
                    Text = (vl.Children.Count + 1).ToString()
                },
                LabelPosition = LabelPosition.Top,
                Geometry = Utils.CreateBaloon(),
                Stroke = new SolidColorBrush(Colors.DarkGray),
                Fill = new SolidColorBrush(clr),
            };

            mark.PointerPressed += mark_PointerPressed;
            maps.PointerMoved += mark_PointerMoved;
            mark.PointerReleased += mark_PointerReleased;

            vl.Children.Add(mark);

            mark.DoubleTapped += mark_DoubleTapped;
        }

The last section of code to add handles the Pointer events for the C1Maps control and the DoubleTapped event for the marks:

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void mark_PointerMoved(object sender, PointerRoutedEventArgs e) { if (current == null) { return; } var cur = e.GetCurrentPoint(maps).Position; cur = new Point(cur.X - offset.X, cur.Y - offset.Y); current.GeoPoint = maps.ScreenToGeographic(cur); e.Handled = true; } void mark_PointerPressed(object sender, PointerRoutedEventArgs e) { offset = e.GetCurrentPoint(sender as C1VectorPlacemark).Position; current = sender as C1VectorPlacemark; e.Handled = true; } void mark_PointerReleased(object sender, PointerRoutedEventArgs e) { current = null; e.Handled = true; } void mark_DoubleTapped(object sender, DoubleTappedRoutedEventArgs e) { e.Handled = true; vl.Children.Remove((C1VectorPlacemark)sender); }

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void mark_PointerMoved(object sender, PointerRoutedEventArgs e)
        {
            if (current == null)
            {
                return;
            }

            var cur = e.GetCurrentPoint(maps).Position;
            cur = new Point(cur.X - offset.X,
                cur.Y - offset.Y);
            current.GeoPoint = maps.ScreenToGeographic(cur);

            e.Handled = true;
        }

        void mark_PointerPressed(object sender, PointerRoutedEventArgs e)
        {
            offset = e.GetCurrentPoint(sender as C1VectorPlacemark).Position;
            current = sender as C1VectorPlacemark;
            e.Handled = true;
        }

        void mark_PointerReleased(object sender, PointerRoutedEventArgs e)
        {
            current = null;
            e.Handled = true;
        }

        void mark_DoubleTapped(object sender, DoubleTappedRoutedEventArgs e)
        {
            e.Handled = true;
            vl.Children.Remove((C1VectorPlacemark)sender);
        }

In this step, you added code to handle the Tapped and other events. You also changed the map source and created random coordinates for the initial map markers.