/// <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.AddWMSLayers(exportItem.wmsLayers);
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);
var width = Math.Abs(left - right);
var scale = MapExporter.map.GetMapScale(exportItem.resolution);
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]);
this.map = new Map(size);
}
/// <summary>
/// Create a worldfile for georeferencing.
/// </summary>
/// <param name="filename"></param>
/// <param name="exportItem"></param>
public static string createWorldFile(string filename, MapExportItem exportItem)
{
filename = filename.Replace(".tiff", ".tfw");
if (!File.Exists(filename))
{
double left = exportItem.bbox[0];
double right = exportItem.bbox[1];
double bottom = exportItem.bbox[2];
double top = exportItem.bbox[3];
using (StreamWriter sw = File.CreateText(filename))
{
/*
* 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];
sw.WriteLine(pixelSizeX.ForceDecimalPoint());
sw.WriteLine(0);
sw.WriteLine(0);
sw.WriteLine(pixelSizeY.ForceDecimalPoint());
sw.WriteLine(x.ForceDecimalPoint());
sw.WriteLine(y.ForceDecimalPoint());
}
}
return(filename);
}
