// export map as raster-image
private void renderButton_Click(object sender, EventArgs e)
{
toolBuilder.addHeader("Export to GeoTiff", false);
// textbox for increase in resolution
var zoom = toolBuilder.addTextboxWithCaption("Zoom factor:", "1");
// textbox and button for new file name input
var file = toolBuilder.addTextboxWithCaption("Filename:", "");
var browsebutton = toolBuilder.addButton("Browse...");
browsebutton.Click += (o, w) =>
{
SaveFileDialog saveFileDialog1 = new SaveFileDialog();
saveFileDialog1.Filter = "bmp files (*.bmp)|*.bmp" ;
if(saveFileDialog1.ShowDialog() == DialogResult.OK)
file.Text = saveFileDialog1.FileName;
};
// label for errors
var error = toolBuilder.addErrorLabel();
// button for performing rasterization
Button button = toolBuilder.addButton("Export", (Layer selectedLayer) =>
{
// no filename is given
if (file.Text == "")
{
toolBuilder.setError("Please provide filename");
return;
}
// æøå not accepted in filename, not supported by GDAL
if (file.Text.ToLower().IndexOfAny("æøå".ToCharArray()) > -1)
{
toolBuilder.setError("No æøå in filename");
return;
}
double zoomfactor = 1;
if (!double.TryParse(zoom.Text, out zoomfactor))
{
// zoom factor must be a number
toolBuilder.setError("Zoom factor not a number");
return;
}
// calulate image resolution and new real world coordinates
var oldWindowRect = ScreenManager.WindowsRect.Clone();
ScreenManager.WindowsRect = new ScreenManager.SGISEnvelope(0, oldWindowRect.MaxX * zoomfactor, 0, oldWindowRect.MaxY * zoomfactor);
ScreenManager.Calculate();
Bitmap mapTemp = new Bitmap((int)ScreenManager.WindowsRect.Width,
(int)ScreenManager.WindowsRect.Height);
var mapRectTemp = ScreenManager.MapScreenToReal(ScreenManager.WindowsRect);
OgcCompliantGeometryFactory fact = new OgcCompliantGeometryFactory();
var boundingGeometry = fact.ToGeometry(mapRectTemp);
Render render = new Render(ScreenManager.Scale, ScreenManager.Offset);
ScreenManager.WindowsRect.Set(oldWindowRect);
ScreenManager.Calculate();
// background worker for performing rasterisation in another thread
BackgroundWorker bwRender = new BackgroundWorker();
bwRender.DoWork += (obj, args) =>
{
var mapGraphics = Graphics.FromImage(mapTemp);
// draw background maps
foreach (Photo p in photos)
{
// only if visible
if (p.Geometry.Intersects(boundingGeometry))
render.Draw(p, mapGraphics);
}
// draw layers
foreach (Layer l in Layers.Reverse())
{
// only if visible
if (!l.Visible)
continue;
// draw only visible features
var visibleFeatures = l.getWithin(boundingGeometry);
lock (l) // lock layer to prevent multithreaded access to style when drawing
{
// render feature
foreach (Feature s in visibleFeatures)
{
render.Draw(s.Geometry, mapGraphics, l.Style);
}
}
}
};
// georeference drawn bitmap
bwRender.RunWorkerCompleted += (obj, args) =>
{
// remove .bmp ending if present
if (file.Text.EndsWith(".bmp"))
file.Text = file.Text.Substring(0, file.Text.Length-4);
// save render
mapTemp.Save(file.Text+".bmp");
// init GDAL and copy image
OSGeo.GDAL.Gdal.AllRegister();
OSGeo.GDAL.Driver srcDrv = OSGeo.GDAL.Gdal.GetDriverByName("GTiff");
OSGeo.GDAL.Dataset srcDs = OSGeo.GDAL.Gdal.Open(file.Text+".bmp", OSGeo.GDAL.Access.GA_ReadOnly);
OSGeo.GDAL.Dataset dstDs = srcDrv.CreateCopy(file.Text+".tiff", srcDs, 0, null, null, null);
//Set the map projection
{
OSGeo.OSR.SpatialReference oSRS = new OSGeo.OSR.SpatialReference("");
oSRS.ImportFromProj4( SRS.ToString() );
string wkt;
// convert projection to wkt
oSRS.ExportToWkt(out wkt);
dstDs.SetProjection(wkt);
}
//Set the map coordinates
double mapWidth = mapRectTemp.Width;
double mapHeight = mapRectTemp.Height;
double[] geoTransfo = new double[] { mapRectTemp.MinX, mapWidth / mapTemp.Width, 0, mapRectTemp.MaxY, 0, -mapHeight / mapTemp.Height };
dstDs.SetGeoTransform(geoTransfo);
dstDs.FlushCache();
dstDs.Dispose();
srcDs.Dispose();
srcDrv.Dispose();
/////////////////////////
};
bwRender.RunWorkerAsync();
});
}
// draws map
private void SGIS_Paint(object sender, PaintEventArgs e)
{
// if map is to be cmpletely redrawn
if (mapDirty)
{
mapDirty = false;
// create temporary map and bounding box
Bitmap mapTemp = new Bitmap(mapWindow.Width, mapWindow.Height);
var mapRectTemp = ScreenManager.MapScreenToReal(ScreenManager.WindowsRect);
Layer selectedLayer = (Layer)layerList.SelectedItem;
OgcCompliantGeometryFactory fact = new OgcCompliantGeometryFactory();
var boundingGeometry = fact.ToGeometry(mapRectTemp);
// create new render instance
Render render = new Render(ScreenManager.Scale, ScreenManager.Offset);
// if we are already rendering a new map
if (bw.IsBusy)
{
// cancel previous rendering
bw.CancelAsync();
while(bw.IsBusy)
Application.DoEvents();
}
bw = new BackgroundWorker();
bw.WorkerSupportsCancellation = true;
// start new rendering in other thread
// this avoids making the application unresponsive
bw.DoWork += (obj, args) =>
{
var mapGraphics = Graphics.FromImage(mapTemp);
// draw wms-maps
foreach(Photo p in photos)
{
if (p.Geometry.Intersects(boundingGeometry))
p.Draw(mapGraphics);
}
// draw layers
foreach (Layer l in Layers.Reverse())
{
// skip layer if not visible
if (!l.Visible)
continue;
// get all visible features in layer
var visibleFeatures = l.getWithin(boundingGeometry);
lock (l)
{
// draw feature
foreach (Feature s in visibleFeatures)
{
// abort if this rendering has been cancelled
if (bw.CancellationPending)
{
args.Cancel = true;
return;
}
if (!s.Selected || l != selectedLayer)
render.Draw(s.Geometry, mapGraphics, l.Style);
else if (l == selectedLayer)
render.Draw(s.Geometry, mapGraphics, Style.Selected);
}
// render quad tree, only for debug purposes
//if (l.QuadTree != null)
// l.QuadTree.render(e.Graphics);
}
}
};
bw.RunWorkerCompleted += (obj, args) =>
{
// if rendering was not cancelled
if (!args.Cancelled)
{
// copy temporary map to stored map
map = mapTemp;
mapRect = mapRectTemp;
// draw new map
redrawDirty();
}
};
bw.RunWorkerAsync();
}
try
{
// draw map stored in member map
var screenRect = ScreenManager.MapRealToScreen(mapRect);
// draw background color
if (mapBgColor != Color.White)
e.Graphics.Clear(mapBgColor);
e.Graphics.DrawImage(map, screenRect);
}
catch (Exception ex)
{
// Will happen after changing SRS
}
// if current srs is projected, draw scale in lower left corner
if (!SRS.IsLatLong)
renderScale(e.Graphics);
// calls mouse render function, will only draw select-rectangle when select is being used
mouse.render(e.Graphics);
}
