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Map point shape performance
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Pedro
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Pedro asked on 12 Oct 2010, 02:45 PM
Hi,

I need to draw a lot of points in the map, this points can be pinpoints or shape points (idealy is square points) and I would like to know what is best for performance? Use the shape or pinpoint? My initial thought was that will be the shape points. And than I have another issue I dont know how to draw square points with fixed size. I tried the rectangle shape but when I zoom in the rectangle remains with the same size.

Regards,
Gonçalo

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Andrey
Telerik team
answered on 14 Oct 2010, 09:40 AM
Hi Gonçalo,

First of all, if you need to draw a lot of points, then I would recommend using of the DynamicLayer. You can find example in our demo application:

http://demos.telerik.com/silverlight/#Map/DynamicLayer

If you need to show a point which DOES NOT change its size when you zoom in/out, then you can use simple Silverlight Rectangle as ItemTemplate. For example, if you need to show simple Location structures over the map, then you can do it as following:

<UserControl x:Class="Telerik.RadMap.Silverlight.Q1.MainPage"
    xmlns:geodata="clr-namespace:GeographicalData"
    Height="600" Width="800">
    <UserControl.Resources>
        <DataTemplate x:Key="RectangleTemplate">
            <Rectangle Width="20" Height="20" Fill="Red"
                       telerik:MapLayer.Location="{Binding}" />
        </DataTemplate>
    </UserControl.Resources>
    <Grid x:Name="LayoutRoot" Background="White">
        <telerik:RadMap x:Name="radMap" 
            Center="37.7847107699891, -122.421295514088"
            ZoomLevel="18">
            <telerik:RadMap.Provider>
                <telerik:OpenStreetMapProvider />
            </telerik:RadMap.Provider>
            <telerik:InformationLayer x:Name="informationLayer" 
                ItemTemplate="{StaticResource RectangleTemplate}" />
        </telerik:RadMap>
    </Grid>
</UserControl>
 

Kind regards,
Andrey Murzov
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Pedro
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answered on 18 Oct 2010, 12:00 PM
How can I draw silverlight rectangle by code?

I'm doing something like this:

Rectangle rect = new Rectangle;
rect.Width = 10;
rect.Height = 10;
 
rect.Fill = new SolidColorBrush(Colors.Yellow);
MapLayer.SetLocation(rect, location);
layer.items.add(rect).

But its not working. it crash
when I do

radMap.Items.Add(layer);
layer.Visibility = System.Windows.Visibility.Visible;

Thanks,
Gonçalo
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Andrey
Telerik team
answered on 20 Oct 2010, 03:54 PM
Hi Gonçalo,

I've checked your code and it works just fine. Here it is a copy of my test code:

private InformationLayer informationLayer;
  
public MainPage()
{
    InitializeComponent();
  
    this.informationLayer = new InformationLayer();
  
    Rectangle rect = new Rectangle();
    rect.Width = 10;
    rect.Height = 10;
    rect.Fill = new SolidColorBrush(Colors.Yellow);
              
    Location location = new Location(37.7850372183918, -122.421150674801);
    MapLayer.SetLocation(rect, location);
    this.informationLayer.Items.Add(rect);
  
    this.radMap.Items.Add(this.informationLayer);
    this.informationLayer.Visibility = System.Windows.Visibility.Visible;
}

Note that you should not add the same information layer to the RadMap more than once. If the problem persists, please send us a small solution which we could use to reproduce it.


Kind regards,
Andrey Murzov
the Telerik team
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