private int[] GetDefaultBands(IRasterDrawing drawing)
{
IRasterDataProvider prd = drawing.DataProvider;
if (prd == null)
{
return(null);
}
return(prd.GetDefaultBands() == null ? new int[] { 1, 2, 3 } : prd.GetDefaultBands());
}
public static string OverView(IRasterDataProvider prd, int maxSize)
{
try
{
int[] bands = prd.GetDefaultBands();
if (bands == null || bands.Length == 0)
{
bands = new int[] { 1, 1, 1 }
}
;
for (int i = 0; i < 3; i++)
{
if (bands[i] > prd.BandCount)
{
bands[i] = 1;
}
}
//int[] newBandMaps;
//PrjBand[] prjBands = BandNoToBand(bands, out newBandMaps);
//bands = bands.Reverse().ToArray();
string overViewFilename = OverFileName(prd.fileName);
using (Bitmap bmp = GenerateOverview(prd, bands, maxSize))
{
bmp.MakeTransparent(Color.Black);
bmp.Save(overViewFilename, ImageFormat.Png);
bmp.Dispose();
}
return(overViewFilename);
}
catch (Exception ex)
{
Console.WriteLine("生成缩略图失败" + ex.Message);
return(null);
}
}
private int[] GetDefaultBands(IRasterDataProvider dataProvider)
{
int[] defaultBands = dataProvider.GetDefaultBands();
if (dataProvider.BandCount > 0)
{
if (defaultBands == null)
{
if (dataProvider.BandCount < 3)
{
defaultBands = new int[] { 1 }
}
;
else
{
defaultBands = new int[] { 1, 2, 3 }
};
}
else
{
for (int i = 0; i < defaultBands.Length; i++)
{
if (defaultBands[i] < 1 || defaultBands[i] > dataProvider.BandCount)
{
defaultBands[i] = 1;
}
}
}
}
if (defaultBands != null)
{
Array.Reverse(defaultBands);
}
return(defaultBands);
}
private void GetBandNos(out int[] defaultBandNos, out int[] otherBandNos)
{
defaultBandNos = _dataProvider.GetDefaultBands();
List <int> bandNos = new List <int>();
for (int b = 1; b <= _dataProvider.BandCount; b++)
{
if (defaultBandNos != null && Array.IndexOf(defaultBandNos, b) >= 0)
{
continue;
}
bandNos.Add(b);
}
otherBandNos = bandNos.Count > 0 ? bandNos.ToArray() : null;
}
private static int[] GetDefaultBands(IRasterDrawing drawing)
{
IRasterDataProvider prd = drawing.DataProvider;
if (prd == null)
{
return(null);
}
int[] defaultBands = prd.GetDefaultBands();
if (defaultBands == null)
{
defaultBands = new int[] { 1, 2, 3 }
}
;
return(defaultBands);
}
private void GetOverview(IRasterDataProvider file, int[] bandNos, out Bitmap bmp)
{
try
{
if (bandNos == null || bandNos.Length == 0)
{
bandNos = file.GetDefaultBands();
}
if (bandNos == null || bandNos.Length == 0)
{
bandNos = new int[] { 1, 1, 1 }
}
;
bmp = GenerateOverview(file, bandNos);
}
catch
{
bmp = null;
}
}
private void GetOverview(IRasterDataProvider file, ISpatialReference spatialRef, int[] bandNos, out Bitmap bmp, out string errorMessage)
{
try
{
errorMessage = "";
if (bandNos == null)
{
bandNos = new int[] { 1 }
}
;
if (!File.Exists(_prjFilename))
{
float resolution = 0.05f;
if (file.DataIdentify != null && file.DataIdentify.Sensor == "VISSR")
{
resolution = 0.1f;
}
if (file.DataIdentify != null && (file.DataIdentify.Satellite == "FY1D"))
{
resolution = 0.1f;
}
PrjOutArg arg = new PrjOutArg(spatialRef, null, resolution, resolution, _prjFilename);
arg.SelectedBands = bandNos.OrderBy((i) => { return(i); }).ToArray();
ProjectionFactory proj = new ProjectionFactory();
string[] files = proj.Project(file, arg, null, out errorMessage);
if (files == null || files.Length == 0 || files[0] == null)
{
bmp = null;
if (string.IsNullOrWhiteSpace(errorMessage))
{
errorMessage = "投影缩略图文件失败";
}
return;
}
_prjFilename = files[0];
}
using (IRasterDataProvider prd = GeoDataDriver.Open(_prjFilename) as IRasterDataProvider)
{
if (bandNos == null || bandNos.Length == 0)
{
bandNos = prd.GetDefaultBands();
}
if (bandNos == null || bandNos.Length == 0)
{
bmp = null;
if (string.IsNullOrWhiteSpace(errorMessage))
{
errorMessage = "获取缩略图显示波段列表为空";
}
return;
}
//bandNos = new int[] { 1, 1, 1 };
int[] orderBandMaps;
PrjBand[] prjBands = BandNoToBand(bandNos, out orderBandMaps);
bmp = GenerateOverview(prd, orderBandMaps);
}
}
catch
{
bmp = null;
throw;
}
}
private static BitmapObject[] GetBitmapObjects(string[] fnames, int maxSize, ICanvas canvas, out Size bmpSize,
out Size dataSize, out GeoDo.RSS.Core.DrawEngine.CoordEnvelope viewPrjEvp,
out GeoDo.RSS.Core.DF.CoordEnvelope viewGeoEvp,
out float resolution)
{
bmpSize = Size.Empty;
dataSize = new Size();
viewPrjEvp = null;
viewGeoEvp = null;
resolution = 0;
List <BitmapObject> bmpObjs = new List <BitmapObject>();
BitmapObject bmpO;
GeoDo.RSS.Core.DrawEngine.CoordEnvelope drawEvp = null;
bool isFirst = true;
foreach (string fname in fnames)
{
if (!File.Exists(fname))
{
continue;
}
using (IRasterDataProvider prd = GeoDataDriver.Open(fname) as IRasterDataProvider)
{
IOverviewGenerator ov = prd as IOverviewGenerator;
bmpSize = ov.ComputeSize(maxSize);
Bitmap bmp = new Bitmap(bmpSize.Width, bmpSize.Height, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
RasterIdentify identify = new RasterIdentify(fname);
object[] sts = GetColorTableFunc(prd, identify.ProductIdentify, identify.SubProductIdentify);
if (sts != null)
{
ov.Generate(new int[] { 1, 1, 1 }, sts, ref bmp);
}
else
{
int[] bands = prd.GetDefaultBands();
if (bands == null || bands.Length == 0)
{
return(null);
}
ov.Generate(bands, ref bmp);
}
drawEvp = GetDrawingEnvelop(canvas, prd);
if (isFirst)
{
viewPrjEvp = drawEvp;
ICoordinateTransform tans = canvas.CoordTransform;
viewGeoEvp = PrjToGeoCoordEvp(viewPrjEvp, tans);
resolution = prd.ResolutionX;
dataSize = GetMaxDataSize(canvas, viewPrjEvp, prd, out viewGeoEvp);
isFirst = false;
}
else
{
viewPrjEvp = viewPrjEvp.Union(drawEvp);
dataSize = GetMaxDataSize(canvas, viewPrjEvp, prd, out viewGeoEvp);
//如果分辩率不相等则取最大的分辨率
if (resolution < prd.ResolutionX)
{
resolution = prd.ResolutionX;
}
}
bmpO = new BitmapObject(bmp, drawEvp);
bmpObjs.Add(bmpO);
}
}
return(bmpObjs.Count != 0 ? bmpObjs.ToArray() : null);
}