/// <summary>
///
/// </summary>
private void EnableBasemapLayer()
{
if (_baseMapLayer == null)
{
//Need to first initialize and add the basemap layer synchronously (it will fail if done in
// another thread.
//First create a temporary imageData with an Envelope (otherwise adding to the map will fail)
var tempImageData = new InRamImageData(Properties.Resources.nodata, new Extent(1, 1, 2, 2));
_baseMapLayer = new MapImageLayer(tempImageData)
{
Projection = App.Map.Projection,
LegendText = Properties.Resources.Legend_Title
};
_baseMapLayer.RemoveItem += BaseMapLayerRemoveItem;
AddBasemapLayerToMap();
}
App.Map.MapFrame.ViewExtentsChanged += MapFrameExtentsChanged;
}
/// <summary>
/// Main method of this plugin: gets the tiles from the TileManager, stitches them together, and adds the layer to the map.
/// </summary>
private void UpdateStichedBasemap(DoWorkEventArgs e)
{
var map = App.Map as Map;
if (map != null)
{
var rectangle = map.Bounds;
var webMercExtent = map.ViewExtents;
//Clip the reported Web Merc Envelope to be within possible Web Merc extents
// This fixes an issue with Reproject returning bad results for very large (impossible) web merc extents reported from the Map
var webMercTopLeftX = TileCalculator.Clip(webMercExtent.MinX, TileCalculator.MinWebMercX, TileCalculator.MaxWebMercX);
var webMercTopLeftY = TileCalculator.Clip(webMercExtent.MaxY, TileCalculator.MinWebMercY, TileCalculator.MaxWebMercY);
var webMercBtmRightX = TileCalculator.Clip(webMercExtent.MaxX, TileCalculator.MinWebMercX, TileCalculator.MaxWebMercX);
var webMercBtmRightY = TileCalculator.Clip(webMercExtent.MinY, TileCalculator.MinWebMercY, TileCalculator.MaxWebMercY);
//report progress and check for cancel
_bw.ReportProgress(25);
if (_bw.CancellationPending)
{
e.Cancel = true;
return;
}
//Get the web mercator vertices of the current map view
var mapVertices = new[] { webMercTopLeftX, webMercTopLeftY, webMercBtmRightX, webMercBtmRightY };
double[] z = { 0, 0 };
//Reproject from web mercator to WGS1984 geographic
Reproject.ReprojectPoints(mapVertices, z, WebMercProj, Wgs84Proj, 0, mapVertices.Length / 2);
var geogEnv = new Envelope(mapVertices[0], mapVertices[2], mapVertices[1], mapVertices[3]);
//report progress and check for cancel
_bw.ReportProgress(40);
if (_bw.CancellationPending)
{
e.Cancel = true;
return;
}
//Grab the tiles
var tiles = _tileManager.GetTiles(geogEnv, rectangle);
//report progress and check for cancel
_bw.ReportProgress(60);
if (_bw.CancellationPending)
{
e.Cancel = true;
return;
}
//Stitch them into a single image
var stitchedBasemap = TileCalculator.StitchTiles(tiles);
stitchedBasemap = GetTransparentBasemapImage(stitchedBasemap, _opacity);
var tileImage = new InRamImageData(stitchedBasemap);
//report progress and check for cancel
_bw.ReportProgress(70);
if (_bw.CancellationPending)
{
e.Cancel = true;
return;
}
//Tiles will have often slightly different bounds from what we are displaying on screen
// so we need to get the top left and bottom right tiles' bounds to get the proper extent
// of the tiled image
var topLeftTile = tiles[0, 0];
var bottomRightTile = tiles[tiles.GetLength(0) - 1, tiles.GetLength(1) - 1];
var tileVertices = new[]
{
topLeftTile.Envelope.TopLeft().X, topLeftTile.Envelope.TopLeft().Y,
bottomRightTile.Envelope.BottomRight().X,
bottomRightTile.Envelope.BottomRight().Y
};
//Reproject from WGS1984 geographic coordinates to web mercator so we can show on the map
Reproject.ReprojectPoints(tileVertices, z, Wgs84Proj, WebMercProj, 0, tileVertices.Length / 2);
tileImage.Bounds = new RasterBounds(stitchedBasemap.Height, stitchedBasemap.Width,
new Extent(tileVertices[0], tileVertices[3], tileVertices[2], tileVertices[1]));
//report progress and check for cancel
_bw.ReportProgress(90);
if (_bw.CancellationPending)
{
e.Cancel = true;
return;
}
_baseMapLayer.Image = tileImage;
//report progress and check for cancel
_bw.ReportProgress(99);
if (_bw.CancellationPending)
{
e.Cancel = true;
return;
}
}
}
/// <summary>
/// Creates a new raster with the specified cell size. If the cell size
/// is zero, this will default to the shorter of the width or height
/// divided by 256. If the cell size produces a raster that is greater
/// than 8, 000 pixels in either dimension, it will be re-sized to
/// create an 8, 000 length or width raster.
/// </summary>
/// <param name="fs">The featureset to convert to a raster.</param>
/// <param name="extent">Force the raster to this specified extent.</param>
/// <param name="cellSize">The double extent of the cell.</param>
/// <param name="fieldName">The integer field index of the file.</param>
/// <param name="outputFileName">The fileName of the raster to create.</param>
/// <param name="driverCode">The optional GDAL driver code to use if using GDAL
/// for a format that is not discernable from the file extension. An empty string
/// is usually perfectly acceptable here.</param>
/// <param name="options">For GDAL rasters, they can be created with optional parameters
/// passed in as a string array. In most cases an empty string is perfectly acceptable.</param>
/// <param name="progressHandler">An interface for handling the progress messages.</param>
/// <returns>Generates a raster from the vectors.</returns>
public static IRaster ToRaster(IFeatureSet fs, Extent extent, double cellSize, string fieldName,
string outputFileName,
string driverCode, string[] options, IProgressHandler progressHandler)
{
Extent env = extent;
if (cellSize == 0)
{
if (env.Width < env.Height)
{
cellSize = env.Width / 256;
}
else
{
cellSize = env.Height / 256;
}
}
int w = (int)Math.Ceiling(env.Width / cellSize);
if (w > 8000)
{
w = 8000;
cellSize = env.Width / 8000;
}
int h = (int)Math.Ceiling(env.Height / cellSize);
if (h > 8000)
{
h = 8000;
}
Bitmap bmp = new Bitmap(w, h);
Graphics g = Graphics.FromImage(bmp);
g.Clear(Color.Transparent);
g.SmoothingMode = SmoothingMode.None;
g.TextRenderingHint = TextRenderingHint.SingleBitPerPixel;
g.InterpolationMode = InterpolationMode.NearestNeighbor;
Hashtable colorTable;
MapArgs args = new MapArgs(new Rectangle(0, 0, w, h), env, g);
switch (fs.FeatureType)
{
case FeatureType.Polygon:
{
MapPolygonLayer mpl = new MapPolygonLayer(fs);
PolygonScheme ps = new PolygonScheme();
colorTable = ps.GenerateUniqueColors(fs, fieldName);
mpl.Symbology = ps;
mpl.DrawRegions(args, new List<Extent> { env });
}
break;
case FeatureType.Line:
{
MapLineLayer mpl = new MapLineLayer(fs);
LineScheme ps = new LineScheme();
colorTable = ps.GenerateUniqueColors(fs, fieldName);
mpl.Symbology = ps;
mpl.DrawRegions(args, new List<Extent> { env });
}
break;
default:
{
MapPointLayer mpl = new MapPointLayer(fs);
PointScheme ps = new PointScheme();
colorTable = ps.GenerateUniqueColors(fs, fieldName);
mpl.Symbology = ps;
mpl.DrawRegions(args, new List<Extent> { env });
}
break;
}
Type tp = fieldName == "FID" ? typeof(int) : fs.DataTable.Columns[fieldName].DataType;
// We will try to convert to double if it is a string
if (tp == typeof(string))
{
tp = typeof(double);
}
InRamImageData image = new InRamImageData(bmp, env);
ProgressMeter pm = new ProgressMeter(progressHandler, "Converting To Raster Cells", h);
IRaster output;
output = Raster.Create(outputFileName, driverCode, w, h, 1, tp, options);
output.Bounds = new RasterBounds(h, w, env);
double noDataValue = output.NoDataValue;
if (fieldName != "FID")
{
// We can't use this method to calculate Max on a non-existent FID field.
double dtMax = Convert.ToDouble(fs.DataTable.Compute("Max(" + fieldName + ")", ""));
double dtMin = Convert.ToDouble(fs.DataTable.Compute("Min(" + fieldName + ")", ""));
if (dtMin <= noDataValue && dtMax >= noDataValue)
{
if (dtMax != GetFieldValue(tp, "MaxValue"))
{
output.NoDataValue = noDataValue;
}
else if (dtMin != GetFieldValue(tp, "MinValue"))
{
output.NoDataValue = noDataValue;
}
}
}
List<RcIndex> locations = new List<RcIndex>();
List<string> failureList = new List<string>();
for (int row = 0; row < h; row++)
{
for (int col = 0; col < w; col++)
{
Color c = image.GetColor(row, col);
if (c.A == 0)
{
output.Value[row, col] = output.NoDataValue;
}
else
{
if (colorTable.ContainsKey(c) == false)
{
if (c.A < 125)
{
output.Value[row, col] = output.NoDataValue;
continue;
}
// Use a color matching distance to pick the closest member
object val = GetCellValue(w, h, row, col, image, c, colorTable, locations);
output.Value[row, col] = GetDouble(val, failureList);
}
else
{
output.Value[row, col] = GetDouble(colorTable[c], failureList);
}
}
}
pm.CurrentValue = row;
}
const int maxIterations = 5;
int iteration = 0;
while (locations.Count > 0)
{
List<RcIndex> newLocations = new List<RcIndex>();
foreach (RcIndex location in locations)
{
object val = GetCellValue(w, h, location.Row, location.Column, image,
image.GetColor(location.Row, location.Column), colorTable, newLocations);
output.Value[location.Row, location.Column] = GetDouble(val, failureList);
}
locations = newLocations;
iteration++;
if (iteration > maxIterations)
{
break;
}
}
pm.Reset();
return output;
}