/// <summary>
/// Creates a bitmap of the requested size that covers the specified geographic extent using
/// the current symbolizer for this layer. This does not have any drawing optimizations,
/// or techniques to speed up performance and should only be used in special cases like
/// draping of vector content onto a texture. It also doesn't worry about selections.
/// </summary>
/// <param name="geographicExtent">The extent to use when computing the snapshot.</param>
/// <param name="width">The integer height of the bitmap. The height is calculated based on
/// the aspect ratio of the specified geographic extent.</param>
/// <returns>A Bitmap object</returns>
public Bitmap SnapShot(IEnvelope geographicExtent, int width)
{
int height = Convert.ToInt32((geographicExtent.Height / geographicExtent.Width) * width);
Bitmap bmp = new Bitmap(width, height, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
Graphics g = Graphics.FromImage(bmp);
ImageProjection p = new ImageProjection(geographicExtent, new Rectangle(0, 0, width, height));
DrawSnapShot(g, p);
g.Dispose();
OnSnapShotTaken(bmp);
return bmp;
}
/// <summary>
/// Creates a bmp texture and saves it to the specified filename. The filename should end in bmp.
/// This also generates a bpw world file for the texture.
/// </summary>
/// <param name="filename">The string filename to write to</param>
/// <param name="progressHandler">The progress handler for creating a new bitmap.</param>
/// <exception cref="MapWindow.Main.FileCantBeDeletedException">The file could not be deleted because it is in use by another application.</exception>
public void WriteBitmap(string filename, IProgressHandler progressHandler)
{
try
{
if (File.Exists(filename)) File.Delete(filename); // we expect textures to get overwritten a lot, so just delete this
}
catch
{
throw new FileCantBeDeletedException(filename);
}
Bitmap bmp = new Bitmap(DataSet.NumColumns, DataSet.NumRows, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
bmp.Save(filename); // for some reason lockbits doesn't work unless we save a copy first.
if (_symbolizer.DrapeVectorLayers == false)
{
// Generate the colorscheme, modified by hillshading if that hillshading is used all in one pass
DataSet.DrawToBitmap(Symbolizer, bmp, progressHandler);
}
else
{
// work backwards. when we get to this layer do the colorscheme.
// First, use this raster and its colorschme to drop the background
DataSet.PaintColorSchemeToBitmap(Symbolizer, bmp, progressHandler);
// Set up a graphics object with a transformation pre-set so drawing a geographic coordinate
// will draw to the correct location on the bitmap
Graphics g = Graphics.FromImage(bmp);
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
IEnvelope extents = DataSet.Bounds.Envelope;
Rectangle target = new Rectangle(0, 0, bmp.Width, bmp.Height);
ImageProjection ip = new ImageProjection(extents, target);
// Cycle through each layer, and as long as it is not this layer, draw the bmp
foreach (ILegendItem layer in GetParentItem().LegendItems)
{
// Temporarilly I am only interested in doing this for vector datasets
IFeatureLayer fl = layer as IFeatureLayer;
if (fl == null) continue;
fl.DrawSnapShot(g, ip);
}
if (Symbolizer.ShadedRelief.IsUsed)
{
// After we have drawn the underlying texture, apply a hillshade if it is requested
Symbolizer.PaintShadingToBitmap(bmp, progressHandler);
}
}
bmp.Save(Path.ChangeExtension(DataSet.Filename, ".bmp"), System.Drawing.Imaging.ImageFormat.Bmp);
bmp.Dispose();
// Create a world file so that the bmp itself becomes geo-referenced
string worldFile = Path.ChangeExtension(DataSet.Filename, ".bpw");
if (File.Exists(worldFile)) File.Delete(worldFile);
FileStream fs = new FileStream(worldFile, FileMode.CreateNew, FileAccess.Write);
StreamWriter tw = new StreamWriter(fs);
// Affine Coefficients
// X = 0 + 1 * column + 2 * row
// Y = 3 + 4 * column + 5 * row
double[] aff = DataSet.Bounds.AffineCoefficients;
tw.WriteLine(aff[1].ToString());
tw.WriteLine(aff[2].ToString());
tw.WriteLine(aff[4].ToString());
tw.WriteLine(aff[5].ToString());
tw.WriteLine(aff[0].ToString());
tw.WriteLine(aff[3].ToString());
tw.Close(); // closes both tw and fs
// World file organization (six values written in string format on separate lines)
// -----------------------
// dx
// rotationX
// rotationY
// dy
// X - position
// Y - position
Symbolizer.Validate();
// Symbolizer.ColorSchemeHasChanged = false;
//OnColorSchemeUpdated();
OnInvalidate(this, new EventArgs());
OnItemChanged();
}
