/// <summary>
/// Creates an image to export.
/// </summary>
/// <param name="exportItem"></param>
/// <param name="fileinfo"></param>
/// <returns>Image</returns>
public static Image GetImage(MapExportItem exportItem)
{
MapExporter mapExporter = new MapExporter(exportItem);
mapExporter.AddWMTSLayers(exportItem.wmtsLayers);
mapExporter.AddWMSLayers(exportItem.wmsLayers);
mapExporter.AddArcGISLayers(exportItem.arcgisLayers);
mapExporter.AddVectorLayers(exportItem.vectorLayers);
double left = exportItem.bbox[0];
double right = exportItem.bbox[1];
double bottom = exportItem.bbox[2];
double top = exportItem.bbox[3];
Envelope envelope = new Envelope(left, right, bottom, top);
mapExporter.map.ZoomToBox(envelope);
Image i = mapExporter.map.GetMap(exportItem.resolution);
Bitmap src = new Bitmap(i);
src.SetResolution(exportItem.resolution, exportItem.resolution);
Bitmap target = new Bitmap(src.Size.Width, src.Size.Height);
target.SetResolution(exportItem.resolution, exportItem.resolution);
Graphics g = Graphics.FromImage(target);
g.FillRectangle(new SolidBrush(Color.White), 0, 0, target.Width, target.Height);
g.DrawImage(src, 0, 0);
return(target);
}
/// <summary>
/// Create a new ExportMap object.
/// </summary>
/// <param name="exportItem"></param>
public MapExporter(MapExportItem exportItem)
{
this.exportItem = exportItem;
var size = new Size(exportItem.size[0], exportItem.size[1]);
Map.Configure();
this.map = new MapThrowsException(size);
}
/// <summary>
/// Create a worldfile for georeferencing.
/// </summary>
/// <param name="filename"></param>
/// <param name="exportItem"></param>
public static byte[] CreateWorldFile(MapExportItem exportItem)
{
double left = exportItem.bbox[0];
double right = exportItem.bbox[1];
double bottom = exportItem.bbox[2];
double top = exportItem.bbox[3];
/*
* Line 1: A: pixel size in the x-direction in map units/pixel
* Line 2: D: rotation about y-axis
* Line 3: B: rotation about x-axis
* Line 4: E: pixel size in the y-direction in map units, almost always negative[3]
* Line 5: C: x-coordinate of the center of the upper left pixel
* Line 6: F: y-coordinate of the center of the upper left pixel
*/
double mapWidth = Math.Abs(left - right);
double mapHeight = Math.Abs(top - bottom);
double pixelSizeX = mapWidth / exportItem.size[0];
double pixelSizeY = (-1) * (mapHeight / exportItem.size[1]);
double x = exportItem.bbox[0];
double y = exportItem.bbox[3];
MemoryStream memoryStream = new MemoryStream();
TextWriter textWriter = new StreamWriter(memoryStream);
textWriter.WriteLine(pixelSizeX.ForceDecimalPoint());
textWriter.WriteLine(0);
textWriter.WriteLine(0);
textWriter.WriteLine(pixelSizeY.ForceDecimalPoint());
textWriter.WriteLine(x.ForceDecimalPoint());
textWriter.WriteLine(y.ForceDecimalPoint());
textWriter.Flush();
memoryStream.Flush();
byte[] bytes = memoryStream.ToArray();
memoryStream.Close();
textWriter.Close();
return(bytes);
}
