Can I put a NetTopologySuite polygon in a "Universal windows" xaml element?

[Louwho]

I was pointed to this group, by someone in SpatiaLite (I cannot fund a NuGet source for SpatiaLite\Universal windows).  Is this group still active, I do not see any activity recently?

I want to display a Polygon created using NetTopologySuite, in an xaml file, grid...

I was pointed to NetTopologySuite, so I added GeoAPi, and NetTopologySuite (Nuget), to a new project, and then looked for examples.  You can imagine, that there is not much out there yet.  I did find this...http://gis.stackexchange.com/questions/21318/how-to-convert-lines-to-polygons-using-nettopologysuite.  Now I am not a full time C# developer, nor am I all that familiar with GIS, so, I am going at this in a trial by fire approach.  I wanted to see if I could create a polygon, and then display it in the XAML grid.

<Page
    x:Class="nts2.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:nts2"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">

    <Grid x:Name="g1"  Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
        <!--<Polygon x:Name="PPPolygon" Stroke="Black" Fill="Red"/> -->
    </Grid>
</Page>

This is the code behind...

GeoAPI.GeometryServiceProvider.Instance = new NetTopologySuite.NtsGeometryServices();

IGeometryFactory geometryFactory = new GeometryFactory();

List<IGeometry> lines = new List<IGeometry>();

WKTReader rdr = new WKTReader(geometryFactory);

lines.Add(rdr.Read("LINESTRING (0 0, 10 0)"));

lines.Add(rdr.Read("LINESTRING (10 0, 10 10)"));

lines.Add(rdr.Read("LINESTRING (10 10, 0 10)"));

lines.Add(rdr.Read("LINESTRING (0 10, 0 0)"));

Polygonizer polygonizer = new Polygonizer();

polygonizer.Add(lines);

IList<IGeometry> polys = new System.Collections.Generic.List<IGeometry>(polygonizer.GetPolygons());

This is where I am trying to display the polygon, in the phone xaml file.  The first error message I got was "cannot convert from systems.collections.generic.ilist<GeoAPI.geomertys.igeomerty> to windows.ui.xaml.uielement". As you can see, I have tried various different things, and have not been successful.  There must be some kind of explicit cast (which I am obviously not familiar with), otherwise why use NetTopologySuite if you cannot display it in the app?

//g1.Children.Add(polygonizer.GetPolygons();

//Polygon p1 = polygonizer.GetPolygons().Cast<Polygon>

//PPPolygon.Points = lines.Cast < Windows.UI.Xaml.Shapes.Polygon.PointsProperty >

PPPolygon.Points = polygonizer.GetPolygons().Cast<PointCollection>;

 

[FObermaier]

Yes, you can:

https://github.com/NetTopologySuite/NetTopologySuite/tree/master/NetTopologySuite.Windows.Media

Unfortunatly there is no nuget-package for this project, you have to compile it yourself.

For its usage, please see:

https://github.com/NetTopologySuite/NetTopologySuite/blob/master/NetTopologySuite.Windows.Forms/Test/BasicTestMedia.cs

Hth FObermaier

[Lou Elston]

As I previously stated, I am fairly new to this. I am not looking for someone to do all my work, but I do need more information.  How to you include in Visual Studio project?   I am unclear on if this is an additional thing to add to my existing solution\project (Already have the GeoAPi and NetTopologySuite), or, if this is to replace them.  Does it work in Windows Universal?  Is there any code example that you can point me to (create polygon, use it in XAML code)?  Thanks

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[Lou Elston]

can anyone help me here?

[FObermaier]

The easiest way is to add the files to your project.

I noticed that you will have to make modifications to the code, especially namespace modifications:

The project was made for WPF Geometry and StreamGeometry. Those are not the geometries you are needing. Some of the methods are not available either, so you will have to find a work around or maybe you don't need them at all.

Namespace modifications include:

System.Windows.Media -> Windows.UI.Xaml.Media

System.Windows -> Windows.Foundation

You definately need:

- WpfPathGeometryWriter.cs

- IPointTransformation.cs

- IdentityPointTransformation.cs

- IPointToPathGeometryFactory.cs

- PointToPathGeometryFactory.cs

You need to define PATH_GEOMETRY as a compile time constant.

I don't have an environment at hand where I can help you any further (Windows7) so you are on your own.

Felix

Am Montag, 7. März 2016 16:52:10 UTC+1 schrieb Louwho: