private ImageSource GenerateMapImage()
{
Collection <Layer> layersToDraw = new Collection <Layer>();
// Create the background world maps using vector tiles stored locally in our MBTiles file and also set the styling though a json file
ThinkGeoMBTilesLayer mbTilesLayer = new ThinkGeoMBTilesLayer(Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "Data/Mbtiles/Frisco.mbtiles"), new Uri(Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "Data/Json/thinkgeo-world-streets-light.json"), UriKind.Relative));
mbTilesLayer.Open();
layersToDraw.Add(mbTilesLayer);
// Create the new layer and set the projection as the data is in srid 2276 and our background is srid 3857 (spherical mercator).
ShapeFileFeatureLayer zoningLayer = new ShapeFileFeatureLayer(Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "Data/Shapefile/Zoning.shp"));
zoningLayer.FeatureSource.ProjectionConverter = new ProjectionConverter(2276, 3857);
zoningLayer.Open();
// Create an Area style on zoom level 1 and then apply it to all zoom levels up to 20.
zoningLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle = new AreaStyle(new GeoPen(GeoBrushes.Blue));
zoningLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;
layersToDraw.Add(zoningLayer);
// Create a GeoCanvas to do the drawing
GeoCanvas canvas = GeoCanvas.CreateDefaultGeoCanvas();
// Create a GeoImage as the image to draw on
GeoImage geoImage = new GeoImage(800, 600);
// Start the drawing by specifying the image, extent and map units
canvas.BeginDrawing(geoImage, MapUtil.GetDrawingExtent(zoningLayer.GetBoundingBox(), 800, 600), GeographyUnit.Meter);
// This collection is used during drawing to pass labels in between layers so we can track collisions
Collection <SimpleCandidate> labels = new Collection <SimpleCandidate>();
// Loop through all the layers and draw them to the GeoCanvas
// The flush is to compact styles that use different drawing levels
foreach (var layer in layersToDraw)
{
layer.Draw(canvas, labels);
canvas.Flush();
}
// End drawing, we can now use the GeoImage
canvas.EndDrawing();
// Create a memory stream and save the GeoImage as a standard PNG formatted image
MemoryStream imageStream = new MemoryStream();
geoImage.Save(imageStream, GeoImageFormat.Png);
// Reset the image stream back to the beginning
imageStream.Position = 0;
return(ImageSource.FromStream(() =>
{
return imageStream;
}));
}
private void mapView_Loaded(object sender, RoutedEventArgs e)
{
//Load the well depth points and depth data from a text file into the dictionary
//We cache this at the class level to prevent form loading it multiple times
string wellDepthPointDataFilePath = SampleHelper.Get("GrayCountyIrrigationWellDepths.csv");
Dictionary <PointShape, double> wellDepthPointData = GetWellDepthPointDataFromCSV(wellDepthPointDataFilePath);
//Get the current extent since we use that to gerenate the grid. Of course this is just for
//the demo and in the real world you can use any extent you like
RectangleShape currentDrawingExtent = MapUtil.GetDrawingExtent(mapView.CurrentExtent, (float)mapView.ActualWidth, (float)mapView.ActualHeight);
//Calculate the cell size based on how many rows and columns you specified
double cellSize = Math.Min(currentDrawingExtent.Width / 4, currentDrawingExtent.Height / 4);
//Greate the grid definition based on the extent, cell size etc.
GridDefinition gridDefinition = new GridDefinition(currentDrawingExtent, cellSize, -9999, wellDepthPointData);
//Generate the grid based on Inverse Distance Weighted interpolation model. You can define your own model if needed.
GridCell[,] gridCellMatrix = GridFeatureSource.GenerateGridMatrix(gridDefinition, new InverseDistanceWeightedGridInterpolationModel(2, double.MaxValue));
//Load a new GridFeatureLayer based on the current grid file
InMemoryGridFeatureLayer gridFeatureLayer = new InMemoryGridFeatureLayer(gridCellMatrix);
gridFeatureLayer.Open();
var currentExtent = gridFeatureLayer.GetBoundingBox();
gridFeatureLayer.Close();
gridFeatureLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle = AreaStyle.CreateSimpleAreaStyle(GeoColors.Transparent, GeoColors.Black);
gridFeatureLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;
//Add the grid layer, the grid cells, and the well points to the map
LayerOverlay layerOverlay = new LayerOverlay();
layerOverlay.Layers.Add(gridFeatureLayer);
mapView.ZoomLevelSet = new ThinkGeoCloudMapsZoomLevelSet();
mapView.CurrentExtent = currentExtent;
mapView.MapUnit = GeographyUnit.Meter;
mapView.Overlays.Add(layerOverlay);
mapView.Refresh();
}
