// get boundary of raster
private Envelope GetExtent()
{
if (_envelope != null)
return _envelope;
if (_gdalDataset != null)
{
var geoTrans = new double[6];
_gdalDataset.GetGeoTransform(geoTrans);
// no rotation...use default transform
if (!_useRotation && !HaveSpot || (geoTrans[0] == 0 && geoTrans[3] == 0))
geoTrans = new[] { 999.5, 1, 0, 1000.5, 0, -1 };
var geoTransform = new GeoTransform(geoTrans);
// image pixels
var dblW = (double)_imageSize.Width;
var dblH = (double)_imageSize.Height;
var left = geoTransform.EnvelopeLeft(dblW, dblH);
var right = geoTransform.EnvelopeRight(dblW, dblH);
var top = geoTransform.EnvelopeTop(dblW, dblH);
var bottom = geoTransform.EnvelopeBottom(dblW, dblH);
return new Envelope(left, right, bottom, top);
}
return null;
}
protected virtual void GetPreview(Dataset dataset, Size size, Graphics g,
Envelope displayBbox, ProjectionInfo mapProjection, Map map)
#endif
{
if (!NeedRotation(dataset))
{
GetNonRotatedPreview(dataset, size, g, displayBbox, mapProjection);
return;
}
var geoTransform = new GeoTransform(dataset);
Bitmap bitmap = null;
var bitmapTL = new Point();
//Coordinate imageTL = new Coordinate(), imageBR = new Coordinate();
//int bitmapWidth, bitmapHeight;
var bitmapSize = new Size();
const int pixelSize = 3; //Format24bppRgb = byte[b,g,r]
if (dataset != null)
{
//check if image is in bounding box
if ((displayBbox.MinX > _envelope.MaxX) || (displayBbox.MaxX < _envelope.MinX)
|| (displayBbox.MaxY < _envelope.MinY) || (displayBbox.MinY > _envelope.MaxY))
return;
// init histo
Histogram = new List<int[]>();
for (int i = 0; i < Bands + 1; i++)
Histogram.Add(new int[256]);
// bounds of section of image to be displayed
//var left = Math.Max(displayBbox.MinX, _envelope.MinX);
//var top = Math.Min(displayBbox.MaxY, _envelope.MaxY);
//var right = Math.Min(displayBbox.MaxX, _envelope.MaxX);
//var bottom = Math.Max(displayBbox.MinY, _envelope.MinY);
var trueImageBbox = displayBbox.Intersection(_envelope);
// put display bounds into current projection
Envelope shownImageBbox;
if (Transform != null)
{
#if !DotSpatialProjections
Transform.MathTransform.Invert();
shownImageBbox = GeometryTransform.TransformBox(trueImageBbox, Transform.MathTransform);
Transform.MathTransform.Invert();
#else
shownImageBbox = GeometryTransform.TransformBox(trueImageBbox, _transform.Source, _transform.Target);
#endif
}
else
{
shownImageBbox = trueImageBbox;
}
// find min/max x and y pixels needed from image
var g2i = geoTransform.GroundToImage(shownImageBbox).Intersection(new Envelope(0, _imageSize.Width, 0, _imageSize.Height));
var gdalImageRect = ToRectangle(g2i);
var displayImageSize = gdalImageRect.Size;
//// find ground coordinates of image pixels
//var groundBR = geoTransform.ImageToGround(imageBR);
//var groundTL = geoTransform.ImageToGround(imageTL);
// convert ground coordinates to map coordinates to figure out where to place the bitmap
var bitmapBR = new Point((int)map.WorldToImage(trueImageBbox.BottomRight()).X + 1,
(int)map.WorldToImage(trueImageBbox.BottomRight()).Y + 1);
bitmapTL = new Point((int)map.WorldToImage(trueImageBbox.TopLeft()).X,
(int)map.WorldToImage(trueImageBbox.TopLeft()).Y);
bitmapSize.Width = bitmapBR.X - bitmapTL.X;
bitmapSize.Height = bitmapBR.Y - bitmapTL.Y;
// check to see if image is on its side
if (bitmapSize.Width > bitmapSize.Height && displayImageSize.Width < displayImageSize.Height)
{
displayImageSize.Width = bitmapSize.Height;
displayImageSize.Height = bitmapSize.Width;
}
else
{
displayImageSize.Width = bitmapSize.Width;
displayImageSize.Height = bitmapSize.Height;
}
// scale
var bitScalar = GetBitScalar();
// 0 pixels in length or height, nothing to display
if (bitmapSize.Width < 1 || bitmapSize.Height < 1)
return;
//initialize bitmap
BitmapData bitmapData;
bitmap = InitializeBitmap(bitmapSize, PixelFormat.Format24bppRgb, out bitmapData);
/*
bitmap = new Bitmap(bitmapLength, bitmapHeight, PixelFormat.Format24bppRgb);
BitmapData bitmapData = bitmap.LockBits(new Rectangle(0, 0, bitmapLength, bitmapHeight),
ImageLockMode.ReadWrite, bitmap.PixelFormat);
*/
try
{
unsafe
{
var cr = _noDataInitColor.R;
var cg = _noDataInitColor.G;
var cb = _noDataInitColor.B;
/* functionality moved to InitializeBitmap
// turn everything to _noDataInitColor, so we can make fill transparent
for (int y = 0; y < bitmapHeight; y++)
{
byte* brow = (byte*)bitmapData.Scan0 + (y * bitmapData.Stride);
for (int x = 0; x < bitmapLength; x++)
{
Int32 offsetX = x * 3;
brow[offsetX++] = cb;
brow[offsetX++] = cg;
brow[offsetX] = cr;
}
}
*/
// create 3 dimensional buffer [band][x pixel][y pixel]
//var tempBuffer = new double[Bands][];
var buffer = new double[Bands][][];
for (int i = 0; i < Bands; i++)
{
buffer[i] = new double[displayImageSize.Width][];
for (var j = 0; j < displayImageSize.Width; j++)
buffer[i][j] = new double[displayImageSize.Height];
}
//Band[] band = new Band[Bands];
var ch = new int[Bands];
//
var noDataValues = new Double[Bands];
var scales = new Double[Bands];
ColorTable colorTable = null;
var imageRect = gdalImageRect;
ColorBlend colorBlend = null;
var intermediateValue = new double[Bands];
// get data from image
for (var i = 0; i < Bands; i++)
{
using (var band = dataset.GetRasterBand(i + 1))
{
int hasVal;
//get nodata value if present
band.GetNoDataValue(out noDataValues[i], out hasVal);
if (hasVal == 0) noDataValues[i] = Double.NaN;
//Get the scale value if present
band.GetScale(out scales[i], out hasVal);
if (hasVal == 0) scales[i] = 1.0;
switch (band.GetRasterColorInterpretation())
{
case ColorInterp.GCI_BlueBand:
ch[i] = 0;
break;
case ColorInterp.GCI_GreenBand:
ch[i] = 1;
break;
case ColorInterp.GCI_RedBand:
ch[i] = 2;
break;
case ColorInterp.GCI_Undefined:
if (Bands > 1)
ch[i] = 3; // infrared
else
{
ch[i] = 4;
colorBlend = GetColorBlend(band);
intermediateValue = new Double[3];
}
break;
case ColorInterp.GCI_GrayIndex:
ch[i] = 0;
break;
case ColorInterp.GCI_PaletteIndex:
if (colorTable != null)
{
//this should not happen
colorTable.Dispose();
}
colorTable = band.GetRasterColorTable();
ch[i] = 5;
intermediateValue = new Double[3];
break;
default:
ch[i] = -1;
break;
}
}
}
// store these values to keep from having to make slow method calls
var bitmapTLX = bitmapTL.X;
var bitmapTLY = bitmapTL.Y;
double imageTop = g2i.MinY;
double imageLeft = g2i.MinX;
double dblMapPixelWidth = map.PixelWidth;
double dblMapPixelHeight = map.PixelHeight;
double dblMapMinX = map.Envelope.MinX;
double dblMapMaxY = map.Envelope.MaxY;
// get inverse values
var geoTop = geoTransform.Inverse[3];
var geoLeft = geoTransform.Inverse[0];
var geoHorzPixRes = geoTransform.Inverse[1];
var geoVertPixRes = geoTransform.Inverse[5];
var geoXRot = geoTransform.Inverse[2];
var geoYRot = geoTransform.Inverse[4];
var dblXScale = (g2i.Width) / (displayImageSize.Width - 1);
var dblYScale = (g2i.Height) / (displayImageSize.Height - 1);
// get inverse transform
// NOTE: calling transform.MathTransform.Inverse() once and storing it
// is much faster than having to call every time it is needed
#if !DotSpatialProjections
IMathTransform inverseTransform = null;
if (Transform != null)
inverseTransform = Transform.MathTransform.Inverse();
#endif
var rowsRead = 0;
var displayImageStep = displayImageSize.Height;
while (rowsRead < displayImageSize.Height)
{
var rowsToRead = displayImageStep;
if (rowsRead + rowsToRead > displayImageSize.Height)
rowsToRead = displayImageSize.Height - rowsRead;
var tempBuffer = new double[displayImageSize.Width * rowsToRead];
for (var i = 0; i < Bands; i++)
{
// read the buffer
using (var band = dataset.GetRasterBand(i + 1))
{
band.ReadRaster(imageRect.Left, imageRect.Top,
imageRect.Width, imageRect.Height,
tempBuffer, displayImageSize.Width, rowsToRead, 0, 0);
}
// parse temp buffer into the image x y value buffer
long pos = 0;
var newRowsRead = rowsRead + rowsToRead;
for (var y = rowsRead; y < newRowsRead; y++)
{
for (var x = 0; x < displayImageSize.Width; x++)
{
buffer[i][x][y] = tempBuffer[pos++];
}
}
}
rowsRead = rowsRead + rowsToRead;
for (var pixY = 0d; pixY < bitmapBR.Y - bitmapTL.Y; pixY++)
{
var row = (byte*) bitmapData.Scan0 + ((int) Math.Round(pixY)*bitmapData.Stride);
for (var pixX = 0; pixX < bitmapBR.X - bitmapTL.X; pixX++)
{
// same as Map.ImageToGround(), but much faster using stored values...rather than called each time
var gndX = dblMapMinX + (pixX + bitmapTLX)*dblMapPixelWidth;
var gndY = dblMapMaxY - (pixY + bitmapTLY)*dblMapPixelHeight;
// transform ground point if needed
if (Transform != null)
{
#if !DotSpatialProjections
var dblPoint = inverseTransform.Transform(new[] {gndX, gndY});
#else
dblPoint = new double[] { GndX, GndY };
Reproject.ReprojectPoints(dblPoint, null, _transform.Source, _transform.Target, 0, 1);
#endif
gndX = dblPoint[0];
gndY = dblPoint[1];
}
// same as GeoTransform.GroundToImage(), but much faster using stored values...
var imageCoord = new Coordinate(
geoLeft + geoHorzPixRes*gndX + geoXRot*gndY,
geoTop + geoYRot*gndX + geoVertPixRes*gndY);
if (!g2i.Contains(imageCoord))
continue;
var imagePt = new Point((int)((imageCoord.X - imageLeft) / dblXScale),
(int)((imageCoord.Y - imageTop) / dblYScale));
// Apply color correction
for (var i = 0; i < Bands; i++)
{
intermediateValue[i] = buffer[i][imagePt.X][imagePt.Y];
// apply scale
intermediateValue[i] *= scales[i];
double spotVal;
var imageVal = spotVal = intermediateValue[i] = intermediateValue[i]/bitScalar;
if (ch[i] == 4)
{
if (imageVal != noDataValues[i])
{
var color = colorBlend.GetColor(Convert.ToSingle(imageVal));
intermediateValue[0] = color.B;
intermediateValue[1] = color.G;
intermediateValue[2] = color.R;
//intVal[3] = ce.c4;
}
else
{
intermediateValue[0] = cb;
intermediateValue[1] = cg;
intermediateValue[2] = cr;
}
}
else if (ch[i] == 5 && colorTable != null)
{
if (imageVal != noDataValues[i])
{
using (var ce = colorTable.GetColorEntry(Convert.ToInt32(imageVal)))
{
intermediateValue[0] = ce.c3;
intermediateValue[1] = ce.c2;
intermediateValue[2] = ce.c1;
//intVal[3] = ce.c4;
}
}
else
{
intermediateValue[0] = cb;
intermediateValue[1] = cg;
intermediateValue[2] = cr;
}
}
else
{
if (ColorCorrect)
{
intermediateValue[i] = ApplyColorCorrection(imageVal, spotVal, ch[i],
gndX,
gndY);
// if pixel is within ground boundary, add its value to the histogram
if (ch[i] != -1 && intermediateValue[i] > 0 &&
(HistoBounds.Bottom >= (int) gndY) &&
HistoBounds.Top <= (int) gndY &&
HistoBounds.Left <= (int) gndX && HistoBounds.Right >= (int) gndX)
{
Histogram[ch[i]][(int) intermediateValue[i]]++;
}
}
if (intermediateValue[i] > 255)
intermediateValue[i] = 255;
}
}
// luminosity
if (Bands >= 3)
Histogram[Bands][
(int)
(intermediateValue[2]*0.2126 + intermediateValue[1]*0.7152 +
intermediateValue[0]*0.0722)]
++;
WritePixel(pixX, intermediateValue, pixelSize, ch, row);
}
}
}
if (colorTable != null)
{
colorTable.Dispose();
}
}
}
finally
{
bitmap.UnlockBits(bitmapData);
}
}
//using (var ia = new ImageAttributes())
//{
// var colorMap = new[]
// {
// new ColorMap {OldColor = _noDataInitColor, NewColor = Color.Transparent},
// new ColorMap {OldColor = TransparentColor, NewColor = Color.Transparent}
// };
//
// ia.SetRemapTable(colorMap, ColorAdjustType.Bitmap);
bitmap.MakeTransparent(_noDataInitColor);
if (TransparentColor != Color.Empty)
bitmap.MakeTransparent(TransparentColor);
g.DrawImage(bitmap, bitmapTL);
//}
}
private void GetNonRotatedPreview(Dataset dataset, Size size, Graphics g,
Envelope bbox, ProjectionInfo mapProjection)
#endif
{
double[] geoTrans = new double[6];
dataset.GetGeoTransform(geoTrans);
// default transform
if (!_useRotation && !HaveSpot || (geoTrans[0] == 0 && geoTrans[3] == 0))
geoTrans = new[] { 999.5, 1, 0, 1000.5, 0, -1 };
Bitmap bitmap = null;
var geoTransform = new GeoTransform(geoTrans);
int DsWidth = 0;
int DsHeight = 0;
BitmapData bitmapData = null;
double[] intVal = new double[Bands];
int p_indx;
double bitScalar = 1.0;
double dblImginMapW = 0, dblImginMapH = 0, dblLocX = 0, dblLocY = 0;
int iPixelSize = 3; //Format24bppRgb = byte[b,g,r]
if (dataset != null)
{
//check if image is in bounding box
if ((bbox.MinX > _envelope.MaxX) || (bbox.MaxX < _envelope.MinX)
|| (bbox.MaxY < _envelope.MinY) || (bbox.MinY > _envelope.MaxY))
return;
DsWidth = _imageSize.Width;
DsHeight = _imageSize.Height;
Histogram = new List<int[]>();
for (int i = 0; i < Bands + 1; i++)
Histogram.Add(new int[256]);
double left = Math.Max(bbox.MinX, _envelope.MinX);
double top = Math.Min(bbox.MaxY, _envelope.MaxY);
double right = Math.Min(bbox.MaxX, _envelope.MaxX);
double bottom = Math.Max(bbox.MinY, _envelope.MinY);
double x1 = Math.Abs(geoTransform.PixelX(left));
double y1 = Math.Abs(geoTransform.PixelY(top));
double imgPixWidth = geoTransform.PixelXwidth(right - left);
double imgPixHeight = geoTransform.PixelYwidth(bottom - top);
//get screen pixels image should fill
double dblBBoxW = bbox.Width;
double dblBBoxtoImgPixX = imgPixWidth / dblBBoxW;
dblImginMapW = size.Width * dblBBoxtoImgPixX * geoTransform.HorizontalPixelResolution;
double dblBBoxH = bbox.Height;
double dblBBoxtoImgPixY = imgPixHeight / dblBBoxH;
dblImginMapH = size.Height * dblBBoxtoImgPixY * -geoTransform.VerticalPixelResolution;
if ((dblImginMapH == 0) || (dblImginMapW == 0))
return;
// ratios of bounding box to image ground space
double dblBBoxtoImgX = size.Width / dblBBoxW;
double dblBBoxtoImgY = size.Height / dblBBoxH;
// set where to display bitmap in Map
if (bbox.MinX != left)
{
if (bbox.MaxX != right)
dblLocX = (_envelope.MinX - bbox.MinX) * dblBBoxtoImgX;
else
dblLocX = size.Width - dblImginMapW;
}
if (bbox.MaxY != top)
{
if (bbox.MinY != bottom)
dblLocY = (bbox.MaxY - _envelope.MaxY) * dblBBoxtoImgY;
else
dblLocY = size.Height - dblImginMapH;
}
bitScalar = GetBitScalar();
try
{
bitmap = new Bitmap((int)Math.Round(dblImginMapW), (int)Math.Round(dblImginMapH),
PixelFormat.Format24bppRgb);
bitmapData =
bitmap.LockBits(
new Rectangle(0, 0, (int)Math.Round(dblImginMapW), (int)Math.Round(dblImginMapH)),
ImageLockMode.ReadWrite, bitmap.PixelFormat);
byte cr = _noDataInitColor.R;
byte cg = _noDataInitColor.G;
byte cb = _noDataInitColor.B;
//
Double[] noDataValues = new Double[Bands];
Double[] scales = new Double[Bands];
ColorTable colorTable = null;
unsafe
{
double[][] buffer = new double[Bands][];
Band[] band = new Band[Bands];
int[] ch = new int[Bands];
// get data from image
for (int i = 0; i < Bands; i++)
{
buffer[i] = new double[(int)Math.Round(dblImginMapW) * (int)Math.Round(dblImginMapH)];
band[i] = dataset.GetRasterBand(i + 1);
//get nodata value if present
Int32 hasVal = 0;
band[i].GetNoDataValue(out noDataValues[i], out hasVal);
if (hasVal == 0) noDataValues[i] = Double.NaN;
band[i].GetScale(out scales[i], out hasVal);
if (hasVal == 0) scales[i] = 1.0;
band[i].ReadRaster((int)Math.Round(x1), (int)Math.Round(y1), (int)Math.Round(imgPixWidth),
(int)Math.Round(imgPixHeight),
buffer[i], (int)Math.Round(dblImginMapW), (int)Math.Round(dblImginMapH),
0, 0);
switch (band[i].GetRasterColorInterpretation())
{
case ColorInterp.GCI_BlueBand:
ch[i] = 0;
break;
case ColorInterp.GCI_GreenBand:
ch[i] = 1;
break;
case ColorInterp.GCI_RedBand:
ch[i] = 2;
break;
case ColorInterp.GCI_Undefined:
if (Bands > 1)
ch[i] = 3; // infrared
else
{
ch[i] = 4;
if (_colorBlend == null)
{
Double dblMin, dblMax;
band[i].GetMinimum(out dblMin, out hasVal);
if (hasVal == 0) dblMin = Double.NaN;
band[i].GetMaximum(out dblMax, out hasVal);
if (hasVal == 0) dblMax = double.NaN;
if (Double.IsNaN(dblMin) || Double.IsNaN(dblMax))
{
double dblMean, dblStdDev;
band[i].GetStatistics(0, 1, out dblMin, out dblMax, out dblMean, out dblStdDev);
//double dblRange = dblMax - dblMin;
//dblMin -= 0.1*dblRange;
//dblMax += 0.1*dblRange;
}
Single[] minmax = new float[] { Convert.ToSingle(dblMin), 0.5f * Convert.ToSingle(dblMin + dblMax), Convert.ToSingle(dblMax) };
Color[] colors = new Color[] { Color.Blue, Color.Yellow, Color.Red };
_colorBlend = new ColorBlend(colors, minmax);
}
intVal = new Double[3];
}
break;
case ColorInterp.GCI_GrayIndex:
ch[i] = 0;
break;
case ColorInterp.GCI_PaletteIndex:
colorTable = band[i].GetRasterColorTable();
ch[i] = 5;
intVal = new Double[3];
break;
default:
ch[i] = -1;
break;
}
}
if (BitDepth == 32)
ch = new[] { 0, 1, 2 };
p_indx = 0;
for (int y = 0; y < Math.Round(dblImginMapH); y++)
{
byte* row = (byte*)bitmapData.Scan0 + (y * bitmapData.Stride);
for (int x = 0; x < Math.Round(dblImginMapW); x++, p_indx++)
{
for (int i = 0; i < Bands; i++)
{
intVal[i] = buffer[i][p_indx]/bitScalar;
Double imageVal = intVal[i] = intVal[i]/bitScalar;
if (ch[i] == 4)
{
if (imageVal != noDataValues[i])
{
Color color = _colorBlend.GetColor(Convert.ToSingle(imageVal));
intVal[0] = color.B;
intVal[1] = color.G;
intVal[2] = color.R;
//intVal[3] = ce.c4;
}
else
{
intVal[0] = cb;
intVal[1] = cg;
intVal[2] = cr;
}
}
else if (ch[i] == 5 && colorTable != null)
{
if (imageVal != noDataValues[i])
{
ColorEntry ce = colorTable.GetColorEntry(Convert.ToInt32(imageVal));
intVal[0] = ce.c3;
intVal[1] = ce.c2;
intVal[2] = ce.c1;
//intVal[3] = ce.c4;
}
else
{
intVal[0] = cb;
intVal[1] = cg;
intVal[2] = cr;
}
}
else
{
if (ColorCorrect)
{
intVal[i] = ApplyColorCorrection(intVal[i], 0, ch[i], 0, 0);
if (Bands >= 3)
Histogram[Bands][
(int) (intVal[2]*0.2126 + intVal[1]*0.7152 + intVal[0]*0.0722)]++;
}
}
if (intVal[i] > 255)
intVal[i] = 255;
}
WritePixel(x, intVal, iPixelSize, ch, row);
}
}
}
}
catch
{
return;
}
finally
{
if (bitmapData != null)
bitmap.UnlockBits(bitmapData);
}
}
if (TransparentColor != Color.Empty)
bitmap.MakeTransparent(TransparentColor);
g.DrawImage(bitmap, new Point((int)Math.Round(dblLocX), (int)Math.Round(dblLocY)));
}
private void ExecuteIntersectionQuery(Coordinate pt, FeatureDataSet ds)
{
if (CoordinateTransformation != null)
{
#if !DotSpatialProjections
if (ReverseCoordinateTransformation != null)
{
pt = GeometryTransform.TransformCoordinate(pt, ReverseCoordinateTransformation.MathTransform);
}
else
{
CoordinateTransformation.MathTransform.Invert();
pt = GeometryTransform.TransformCoordinate(pt, CoordinateTransformation.MathTransform);
CoordinateTransformation.MathTransform.Invert();
}
#else
pt = GeometryTransform.TransformCoordinate(pt,
CoordinateTransformation.Target,
CoordinateTransformation.Source);
#endif
}
//Setup resulting Table
var dt = new FeatureDataTable();
dt.Columns.Add("Ordinate X", typeof(Double));
dt.Columns.Add("Ordinate Y", typeof(Double));
for (int i = 1; i <= Bands; i++)
dt.Columns.Add(string.Format("Value Band {0}", i), typeof(Double));
//Get location on raster
Double[] buffer = new double[1];
Int32[] bandMap = new int[Bands];
for (int i = 1; i <= Bands; i++) bandMap[i - 1] = i;
var geoTransform = new GeoTransform(_gdalDataset);
var imgPt = geoTransform.GroundToImage(pt);
Int32 x = Convert.ToInt32(imgPt.X);
Int32 y = Convert.ToInt32(imgPt.Y);
//Test if raster ordinates are within bounds
if (x < 0) return;
if (y < 0) return;
if (x >= _imageSize.Width) return;
if (y >= _imageSize.Height) return;
//Create new row, add ordinates and location geometry
FeatureDataRow dr = dt.NewRow();
dr.Geometry = Factory.CreatePoint(pt);
dr[0] = pt.X;
dr[1] = pt.Y;
//Add data from raster
for (int i = 1; i <= Bands; i++)
{
Band band = _gdalDataset.GetRasterBand(i);
//DataType dtype = band.DataType;
CPLErr res = band.ReadRaster(x, y, 1, 1, buffer, 1, 1, 0, 0);
if (res == CPLErr.CE_None)
{
dr[1 + i] = buffer[0];
}
else
{
dr[1 + i] = Double.NaN;
}
}
//Add new row to table
dt.Rows.Add(dr);
//Add table to dataset
ds.Tables.Add(dt);
}
protected virtual void GetPreview(Dataset dataset, Size size, Graphics g,
Envelope displayBbox, ProjectionInfo mapProjection, Map map)
#endif
{
DateTime drawStart = DateTime.Now;
double totalReadDataTime = 0;
double totalTimeSetPixel = 0;
if (!NeedRotation(dataset))
{
GetNonRotatedPreview(dataset, size, g, displayBbox, mapProjection);
return;
}
var geoTransform = new GeoTransform(dataset);
Bitmap bitmap = null;
var bitmapTl = new Point();
var bitmapSize = new Size();
const int pixelSize = 3; //Format24bppRgb = byte[b,g,r]
if (dataset != null)
{
//check if image is in bounding box
if ((displayBbox.MinX > _envelope.MaxX) || (displayBbox.MaxX < _envelope.MinX)
|| (displayBbox.MaxY < _envelope.MinY) || (displayBbox.MinY > _envelope.MaxY))
return;
// init histo
Histogram = new List<int[]>();
for (int i = 0; i < Bands + 1; i++)
Histogram.Add(new int[256]);
var trueImageBbox = displayBbox.Intersection(_envelope);
// put display bounds into current projection
Envelope shownImageBbox = trueImageBbox;
#if !DotSpatialProjections
if (ReverseCoordinateTransformation != null)
{
shownImageBbox = GeometryTransform.TransformBox(trueImageBbox, ReverseCoordinateTransformation.MathTransform);
}
#else
if (CoordinateTransformation != null)
{
shownImageBbox = GeometryTransform.TransformBox(trueImageBbox,
CoordinateTransformation.Target, CoordinateTransformation.Source);
}
#endif
// find min/max x and y pixels needed from image
var g2I = geoTransform.GroundToImage(shownImageBbox).Intersection(new Envelope(0, _imageSize.Width, 0, _imageSize.Height));
var gdalImageRect = ToRectangle(g2I);
var displayImageSize = gdalImageRect.Size;
// convert ground coordinates to map coordinates to figure out where to place the bitmap
var bitmapBr = new Point((int)map.WorldToImage(trueImageBbox.BottomRight()).X + 1,
(int)map.WorldToImage(trueImageBbox.BottomRight()).Y + 1);
bitmapTl = new Point((int)map.WorldToImage(trueImageBbox.TopLeft()).X,
(int)map.WorldToImage(trueImageBbox.TopLeft()).Y);
bitmapSize.Width = bitmapBr.X - bitmapTl.X;
bitmapSize.Height = bitmapBr.Y - bitmapTl.Y;
// check to see if image is on its side
if (bitmapSize.Width > bitmapSize.Height && displayImageSize.Width < displayImageSize.Height)
{
displayImageSize.Width = bitmapSize.Height;
displayImageSize.Height = bitmapSize.Width;
}
else
{
displayImageSize.Width = bitmapSize.Width;
displayImageSize.Height = bitmapSize.Height;
}
// scale
var bitScalar = GetBitScalar();
// 0 pixels in length or height, nothing to display
if (bitmapSize.Width < 1 || bitmapSize.Height < 1)
return;
//initialize bitmap
BitmapData bitmapData;
bitmap = InitializeBitmap(bitmapSize, PixelFormat.Format24bppRgb, out bitmapData);
try
{
unsafe
{
var cr = _noDataInitColor.R;
var cg = _noDataInitColor.G;
var cb = _noDataInitColor.B;
// create 3 dimensional buffer [band][x pixel][y pixel]
var buffer = new double[Bands][][];
for (int i = 0; i < Bands; i++)
{
buffer[i] = new double[displayImageSize.Width][];
for (var j = 0; j < displayImageSize.Width; j++)
buffer[i][j] = new double[displayImageSize.Height];
}
var ch = new int[Bands];
var noDataValues = new Double[Bands];
var scales = new Double[Bands];
ColorTable colorTable = null;
short[][] colorTableCache = null;
var imageRect = gdalImageRect;
ColorBlend colorBlend = null;
var intermediateValue = new double[Bands];
// get data from image
for (var i = 0; i < Bands; i++)
{
using (var band = dataset.GetRasterBand(i + 1))
{
int hasVal;
//get nodata value if present
band.GetNoDataValue(out noDataValues[i], out hasVal);
if (hasVal == 0) noDataValues[i] = Double.NaN;
//Get the scale value if present
band.GetScale(out scales[i], out hasVal);
if (hasVal == 0) scales[i] = 1.0;
switch (band.GetRasterColorInterpretation())
{
case ColorInterp.GCI_BlueBand:
ch[i] = 0;
break;
case ColorInterp.GCI_GreenBand:
ch[i] = 1;
break;
case ColorInterp.GCI_RedBand:
ch[i] = 2;
break;
case ColorInterp.GCI_Undefined:
if (Bands > 1)
ch[i] = 3; // infrared
else
{
ch[i] = 4;
colorBlend = GetColorBlend(band);
intermediateValue = new Double[3];
}
break;
case ColorInterp.GCI_GrayIndex:
ch[i] = 0;
break;
case ColorInterp.GCI_PaletteIndex:
if (colorTable != null)
{
//this should not happen
colorTable.Dispose();
}
colorTable = band.GetRasterColorTable();
int numColors = colorTable.GetCount();
colorTableCache = new short[numColors][];
for (int col = 0; col < numColors; col++)
{
using (var colEntry = colorTable.GetColorEntry(col))
{
colorTableCache[col] = new short[]{
colEntry.c1, colEntry.c2, colEntry.c3
};
}
}
ch[i] = 5;
intermediateValue = new Double[3];
break;
default:
ch[i] = -1;
break;
}
}
}
// store these values to keep from having to make slow method calls
var bitmapTlx = bitmapTl.X;
var bitmapTly = bitmapTl.Y;
double imageTop = g2I.MinY;
double imageLeft = g2I.MinX;
double dblMapPixelWidth = map.PixelWidth;
double dblMapPixelHeight = map.PixelHeight;
double dblMapMinX = map.Envelope.MinX;
double dblMapMaxY = map.Envelope.MaxY;
// get inverse values
var geoTop = geoTransform.Inverse[3];
var geoLeft = geoTransform.Inverse[0];
var geoHorzPixRes = geoTransform.Inverse[1];
var geoVertPixRes = geoTransform.Inverse[5];
var geoXRot = geoTransform.Inverse[2];
var geoYRot = geoTransform.Inverse[4];
var dblXScale = (g2I.Width) / (displayImageSize.Width - 1);
var dblYScale = (g2I.Height) / (displayImageSize.Height - 1);
// get inverse transform
// NOTE: calling transform.MathTransform.Inverse() once and storing it
// is much faster than having to call every time it is needed
#if !DotSpatialProjections
IMathTransform inverseTransform = null;
if (ReverseCoordinateTransformation != null)
inverseTransform = ReverseCoordinateTransformation.MathTransform;
#else
DotSpatial.Projections.ICoordinateTransformation inverseTransform = null;
if (CoordinateTransformation != null)
{
inverseTransform = new DotSpatial.Projections.CoordinateTransformation { Source = CoordinateTransformation.Target, Target = CoordinateTransformation.Source };
}
#endif
var rowsRead = 0;
var displayImageStep = displayImageSize.Height;
while (rowsRead < displayImageStep)
{
var rowsToRead = displayImageStep;
if (rowsRead + rowsToRead > displayImageStep)
rowsToRead = displayImageStep - rowsRead;
var tempBuffer = new double[displayImageSize.Width * rowsToRead];
for (var i = 0; i < Bands; i++)
{
// read the buffer
using (var band = dataset.GetRasterBand(i + 1))
{
DateTime start = DateTime.Now;
band.ReadRaster(imageRect.Left, imageRect.Top,
imageRect.Width, imageRect.Height,
tempBuffer, displayImageSize.Width, rowsToRead, 0, 0);
if (_logger.IsDebugEnabled)
{
TimeSpan took = DateTime.Now - start;
totalReadDataTime += took.TotalMilliseconds;
}
}
// parse temp buffer into the image x y value buffer
long pos = 0;
var newRowsRead = rowsRead + rowsToRead;
for (var y = rowsRead; y < newRowsRead; y++)
{
for (var x = 0; x < displayImageSize.Width; x++)
{
buffer[i][x][y] = tempBuffer[pos++];
}
}
}
rowsRead = rowsRead + rowsToRead;
for (var pixY = 0d; pixY < bitmapBr.Y - bitmapTl.Y; pixY++)
{
var row = (byte*) bitmapData.Scan0 + ((int) Math.Round(pixY)*bitmapData.Stride);
for (var pixX = 0; pixX < bitmapBr.X - bitmapTl.X; pixX++)
{
// same as Map.ImageToGround(), but much faster using stored values...rather than called each time
var gndX = dblMapMinX + (pixX + bitmapTlx)*dblMapPixelWidth;
var gndY = dblMapMaxY - (pixY + bitmapTly)*dblMapPixelHeight;
// transform ground point if needed
if (inverseTransform != null)
{
#if !DotSpatialProjections
var dblPoint = inverseTransform.Transform(new[] {gndX, gndY});
#else
var dblPoint = new double[] { gndX, gndY };
Reproject.ReprojectPoints(dblPoint, null, inverseTransform.Source, inverseTransform.Target, 0, 1);
#endif
gndX = dblPoint[0];
gndY = dblPoint[1];
}
// same as GeoTransform.GroundToImage(), but much faster using stored values...
var imageCoord = new Coordinate(
geoLeft + geoHorzPixRes*gndX + geoXRot*gndY,
geoTop + geoYRot*gndX + geoVertPixRes*gndY);
if (!g2I.Contains(imageCoord))
continue;
var imagePt = new Point((int)((imageCoord.X - imageLeft) / dblXScale),
(int)((imageCoord.Y - imageTop) / dblYScale));
// Apply color correction
for (var i = 0; i < Bands; i++)
{
intermediateValue[i] = buffer[i][imagePt.X][imagePt.Y];
// apply scale
intermediateValue[i] *= scales[i];
double spotVal;
var imageVal = spotVal = intermediateValue[i] = intermediateValue[i]/bitScalar;
if (ch[i] == 4)
{
if (!DoublesAreEqual(imageVal,noDataValues[i]))
{
var color = colorBlend.GetColor(Convert.ToSingle(imageVal));
intermediateValue[0] = color.B;
intermediateValue[1] = color.G;
intermediateValue[2] = color.R;
//intVal[3] = ce.c4;
}
else
{
intermediateValue[0] = cb;
intermediateValue[1] = cg;
intermediateValue[2] = cr;
}
}
else if (ch[i] == 5 && colorTable != null)
{
if (double.IsNaN(noDataValues[i]) || !DoublesAreEqual(imageVal, noDataValues[i]))
{
var ce = colorTableCache[Convert.ToInt32(imageVal)];
intermediateValue[0] = ce[2];
intermediateValue[1] = ce[1];
intermediateValue[2] = ce[0];
}
else
{
intermediateValue[0] = cb;
intermediateValue[1] = cg;
intermediateValue[2] = cr;
}
}
else
{
if (ColorCorrect)
{
intermediateValue[i] = ApplyColorCorrection(imageVal, spotVal, ch[i],
gndX,
gndY);
// if pixel is within ground boundary, add its value to the histogram
if (ch[i] != -1 && intermediateValue[i] > 0 &&
(HistoBounds.Bottom >= (int) gndY) &&
HistoBounds.Top <= (int) gndY &&
HistoBounds.Left <= (int) gndX && HistoBounds.Right >= (int) gndX)
{
Histogram[ch[i]][(int) intermediateValue[i]]++;
}
}
if (intermediateValue[i] > 255)
intermediateValue[i] = 255;
}
}
// luminosity
if (Bands >= 3)
Histogram[Bands][
(int)
(intermediateValue[2]*0.2126 + intermediateValue[1]*0.7152 +
intermediateValue[0]*0.0722)]
++;
DateTime writeStart = DateTime.MinValue;
if (_logger.IsDebugEnabled)
writeStart = DateTime.Now;
WritePixel(pixX, intermediateValue, pixelSize, ch, row);
if (_logger.IsDebugEnabled)
{
TimeSpan took = DateTime.Now - writeStart;
totalTimeSetPixel += took.TotalMilliseconds;
}
}
}
}
if (colorTable != null)
{
colorTable.Dispose();
}
}
}
finally
{
bitmap.UnlockBits(bitmapData);
}
}
DateTime drawGdiStart = DateTime.Now;
bitmap.MakeTransparent(_noDataInitColor);
if (TransparentColor != Color.Empty)
bitmap.MakeTransparent(TransparentColor);
g.DrawImage(bitmap, bitmapTl);
if (_logger.IsDebugEnabled)
{
TimeSpan took = DateTime.Now - drawStart;
TimeSpan drawGdiTook = DateTime.Now - drawGdiStart;
_logger.DebugFormat("Draw GdalImage in {0}ms, readTime: {1}, setPixelTime: {2}, drawTime: {3}", took.TotalMilliseconds, totalReadDataTime,
totalTimeSetPixel, drawGdiTook.TotalMilliseconds);
}
}
private bool NeedRotation(Dataset dataset)
{
if (UseRotation)
return true;
if (Transform != null)
return true;
if (HaveSpot)
return true;
var geoTransform = new GeoTransform(dataset);
return geoTransform.IsScaling || geoTransform.IsRotating;
}
protected virtual void GetPreview(Dataset dataset, Size size, Graphics g,
BoundingBox displayBbox, ProjectionInfo mapProjection, Map map)
#endif
{
double[] geoTrans = new double[6];
_gdalDataset.GetGeoTransform(geoTrans);
// not rotated, use faster display method
if ((!_useRotation ||
(geoTrans[1] == 1 && geoTrans[2] == 0 && geoTrans[4] == 0 && Math.Abs(geoTrans[5]) == 1))
&& !_haveSpot && _transform == null)
{
GetNonRotatedPreview(dataset, size, g, displayBbox, mapProjection);
return;
}
// not rotated, but has spot...need default rotation
else if ((geoTrans[0] == 0 && geoTrans[3] == 0) && _haveSpot)
geoTrans = new[] { 999.5, 1, 0, 1000.5, 0, -1 };
_geoTransform = new GeoTransform(geoTrans);
double DsWidth = _imagesize.Width;
double DsHeight = _imagesize.Height;
double left, top, right, bottom;
double GndX = 0, GndY = 0, ImgX = 0, ImgY = 0, PixX, PixY;
double[] intVal = new double[Bands];
double imageVal = 0, SpotVal = 0;
double bitScalar = 1.0;
Bitmap bitmap = null;
Point bitmapTL = new Point(), bitmapBR = new Point();
Geometries.Point imageTL = new Geometries.Point(), imageBR = new Geometries.Point();
BoundingBox shownImageBbox, trueImageBbox;
int bitmapLength, bitmapHeight;
int displayImageLength, displayImageHeight;
int iPixelSize = 3; //Format24bppRgb = byte[b,g,r]
if (dataset != null)
{
//check if image is in bounding box
if ((displayBbox.Left > _envelope.Right) || (displayBbox.Right < _envelope.Left)
|| (displayBbox.Top < _envelope.Bottom) || (displayBbox.Bottom > _envelope.Top))
return;
// init histo
_histogram = new List<int[]>();
for (int i = 0; i < _lbands + 1; i++)
_histogram.Add(new int[256]);
// bounds of section of image to be displayed
left = Math.Max(displayBbox.Left, _envelope.Left);
top = Math.Min(displayBbox.Top, _envelope.Top);
right = Math.Min(displayBbox.Right, _envelope.Right);
bottom = Math.Max(displayBbox.Bottom, _envelope.Bottom);
trueImageBbox = new BoundingBox(left, bottom, right, top);
// put display bounds into current projection
if (_transform != null)
{
#if !DotSpatialProjections
_transform.MathTransform.Invert();
shownImageBbox = GeometryTransform.TransformBox(trueImageBbox, _transform.MathTransform);
_transform.MathTransform.Invert();
#else
shownImageBbox = GeometryTransform.TransformBox(trueImageBbox, _transform.Source, _transform.Target);
#endif
}
else
shownImageBbox = trueImageBbox;
// find min/max x and y pixels needed from image
imageBR.X =
(int)
(Math.Max(_geoTransform.GroundToImage(shownImageBbox.TopLeft).X,
Math.Max(_geoTransform.GroundToImage(shownImageBbox.TopRight).X,
Math.Max(_geoTransform.GroundToImage(shownImageBbox.BottomLeft).X,
_geoTransform.GroundToImage(shownImageBbox.BottomRight).X))) + 1);
imageBR.Y =
(int)
(Math.Max(_geoTransform.GroundToImage(shownImageBbox.TopLeft).Y,
Math.Max(_geoTransform.GroundToImage(shownImageBbox.TopRight).Y,
Math.Max(_geoTransform.GroundToImage(shownImageBbox.BottomLeft).Y,
_geoTransform.GroundToImage(shownImageBbox.BottomRight).Y))) + 1);
imageTL.X =
(int)
Math.Min(_geoTransform.GroundToImage(shownImageBbox.TopLeft).X,
Math.Min(_geoTransform.GroundToImage(shownImageBbox.TopRight).X,
Math.Min(_geoTransform.GroundToImage(shownImageBbox.BottomLeft).X,
_geoTransform.GroundToImage(shownImageBbox.BottomRight).X)));
imageTL.Y =
(int)
Math.Min(_geoTransform.GroundToImage(shownImageBbox.TopLeft).Y,
Math.Min(_geoTransform.GroundToImage(shownImageBbox.TopRight).Y,
Math.Min(_geoTransform.GroundToImage(shownImageBbox.BottomLeft).Y,
_geoTransform.GroundToImage(shownImageBbox.BottomRight).Y)));
// stay within image
if (imageBR.X > _imagesize.Width)
imageBR.X = _imagesize.Width;
if (imageBR.Y > _imagesize.Height)
imageBR.Y = _imagesize.Height;
if (imageTL.Y < 0)
imageTL.Y = 0;
if (imageTL.X < 0)
imageTL.X = 0;
displayImageLength = (int)(imageBR.X - imageTL.X);
displayImageHeight = (int)(imageBR.Y - imageTL.Y);
// find ground coordinates of image pixels
Geometries.Point groundBR = _geoTransform.ImageToGround(imageBR);
Geometries.Point groundTL = _geoTransform.ImageToGround(imageTL);
// convert ground coordinates to map coordinates to figure out where to place the bitmap
bitmapBR = new Point((int)map.WorldToImage(trueImageBbox.BottomRight).X + 1,
(int)map.WorldToImage(trueImageBbox.BottomRight).Y + 1);
bitmapTL = new Point((int)map.WorldToImage(trueImageBbox.TopLeft).X,
(int)map.WorldToImage(trueImageBbox.TopLeft).Y);
bitmapLength = bitmapBR.X - bitmapTL.X;
bitmapHeight = bitmapBR.Y - bitmapTL.Y;
// check to see if image is on its side
if (bitmapLength > bitmapHeight && displayImageLength < displayImageHeight)
{
displayImageLength = bitmapHeight;
displayImageHeight = bitmapLength;
}
else
{
displayImageLength = bitmapLength;
displayImageHeight = bitmapHeight;
}
// scale
if (_bitDepth == 12)
bitScalar = 16.0;
else if (_bitDepth == 16)
bitScalar = 256.0;
else if (_bitDepth == 32)
bitScalar = 16777216.0;
// 0 pixels in length or height, nothing to display
if (bitmapLength < 1 || bitmapHeight < 1)
return;
//initialize bitmap
bitmap = new Bitmap(bitmapLength, bitmapHeight, PixelFormat.Format24bppRgb);
BitmapData bitmapData = bitmap.LockBits(new Rectangle(0, 0, bitmapLength, bitmapHeight),
ImageLockMode.ReadWrite, bitmap.PixelFormat);
try
{
unsafe
{
// turn everything to _noDataInitColor, so we can make fill transparent
byte cr = _noDataInitColor.R;
byte cg = _noDataInitColor.G;
byte cb = _noDataInitColor.B;
for (int y = 0; y < bitmapHeight; y++)
{
byte* brow = (byte*)bitmapData.Scan0 + (y * bitmapData.Stride);
for (int x = 0; x < bitmapLength; x++)
{
Int32 offsetX = x * 3;
brow[offsetX++] = cb;
brow[offsetX++] = cg;
brow[offsetX] = cr;
}
}
// create 3 dimensional buffer [band][x pixel][y pixel]
double[][] tempBuffer = new double[Bands][];
double[][][] buffer = new double[Bands][][];
for (int i = 0; i < Bands; i++)
{
buffer[i] = new double[displayImageLength][];
for (int j = 0; j < displayImageLength; j++)
buffer[i][j] = new double[displayImageHeight];
}
Band[] band = new Band[Bands];
int[] ch = new int[Bands];
//
Double[] noDataValues = new Double[Bands];
Double[] scales = new Double[Bands];
ColorTable colorTable = null;
// get data from image
for (int i = 0; i < Bands; i++)
{
tempBuffer[i] = new double[displayImageLength * displayImageHeight];
band[i] = dataset.GetRasterBand(i + 1);
//get nodata value if present
Int32 hasVal = 0;
band[i].GetNoDataValue(out noDataValues[i], out hasVal);
if (hasVal == 0) noDataValues[i] = Double.NaN;
band[i].GetScale(out scales[i], out hasVal);
if (hasVal == 0) scales[i] = 1.0;
band[i].ReadRaster(
(int)imageTL.X,
(int)imageTL.Y,
(int)(imageBR.X - imageTL.X),
(int)(imageBR.Y - imageTL.Y),
tempBuffer[i], displayImageLength, displayImageHeight, 0, 0);
// parse temp buffer into the image x y value buffer
long pos = 0;
for (int y = 0; y < displayImageHeight; y++)
{
for (int x = 0; x < displayImageLength; x++, pos++)
buffer[i][x][y] = tempBuffer[i][pos];
}
if (band[i].GetRasterColorInterpretation() == ColorInterp.GCI_BlueBand) ch[i] = 0;
else if (band[i].GetRasterColorInterpretation() == ColorInterp.GCI_GreenBand) ch[i] = 1;
else if (band[i].GetRasterColorInterpretation() == ColorInterp.GCI_RedBand) ch[i] = 2;
else if (band[i].GetRasterColorInterpretation() == ColorInterp.GCI_Undefined)
{
if (Bands > 1)
ch[i] = 3; // infrared
else
{
ch[i] = 4;
if (_colorBlend == null)
{
Double dblMin, dblMax;
band[i].GetMinimum(out dblMin, out hasVal);
if (hasVal == 0) dblMin = Double.NaN;
band[i].GetMaximum(out dblMax, out hasVal);
if (hasVal == 0) dblMax = double.NaN;
if (Double.IsNaN(dblMin) || Double.IsNaN(dblMax))
{
double dblMean, dblStdDev;
band[i].GetStatistics(0, 1, out dblMin, out dblMax, out dblMean, out dblStdDev);
//double dblRange = dblMax - dblMin;
//dblMin -= 0.1*dblRange;
//dblMax += 0.1*dblRange;
}
Single[] minmax = new float[] { Convert.ToSingle(dblMin), 0.5f * Convert.ToSingle(dblMin + dblMax), Convert.ToSingle(dblMax) };
Color[] colors = new Color[] { Color.Blue, Color.Yellow, Color.Red };
_colorBlend = new ColorBlend(colors, minmax);
}
intVal = new Double[3];
}
}
else if (band[i].GetRasterColorInterpretation() == ColorInterp.GCI_GrayIndex) ch[i] = 0;
else if (band[i].GetRasterColorInterpretation() == ColorInterp.GCI_PaletteIndex)
{
colorTable = band[i].GetRasterColorTable();
ch[i] = 5;
intVal = new Double[3];
}
else ch[i] = -1;
}
// store these values to keep from having to make slow method calls
int bitmapTLX = bitmapTL.X;
int bitmapTLY = bitmapTL.Y;
double imageTop = imageTL.Y;
double imageLeft = imageTL.X;
double dblMapPixelWidth = map.PixelWidth;
double dblMapPixelHeight = map.PixelHeight;
double dblMapMinX = map.Envelope.Min.X;
double dblMapMaxY = map.Envelope.Max.Y;
double geoTop, geoLeft, geoHorzPixRes, geoVertPixRes, geoXRot, geoYRot;
// get inverse values
geoTop = _geoTransform.Inverse[3];
geoLeft = _geoTransform.Inverse[0];
geoHorzPixRes = _geoTransform.Inverse[1];
geoVertPixRes = _geoTransform.Inverse[5];
geoXRot = _geoTransform.Inverse[2];
geoYRot = _geoTransform.Inverse[4];
double dblXScale = (imageBR.X - imageTL.X) / (displayImageLength - 1);
double dblYScale = (imageBR.Y - imageTL.Y) / (displayImageHeight - 1);
double[] dblPoint;
// get inverse transform
// NOTE: calling transform.MathTransform.Inverse() once and storing it
// is much faster than having to call every time it is needed
#if !DotSpatialProjections
IMathTransform inverseTransform = null;
if (_transform != null)
inverseTransform = _transform.MathTransform.Inverse();
#endif
for (PixY = 0; PixY < bitmapBR.Y - bitmapTL.Y; PixY++)
{
byte* row = (byte*)bitmapData.Scan0 + ((int)Math.Round(PixY) * bitmapData.Stride);
for (PixX = 0; PixX < bitmapBR.X - bitmapTL.X; PixX++)
{
// same as Map.ImageToGround(), but much faster using stored values...rather than called each time
GndX = dblMapMinX + (PixX + bitmapTLX) * dblMapPixelWidth;
GndY = dblMapMaxY - (PixY + bitmapTLY) * dblMapPixelHeight;
// transform ground point if needed
if (_transform != null)
{
#if !DotSpatialProjections
dblPoint = inverseTransform.Transform(new[] { GndX, GndY });
#else
dblPoint = new double[] { GndX, GndY };
Reproject.ReprojectPoints(dblPoint, null, _transform.Source, _transform.Target, 0, 1);
#endif
GndX = dblPoint[0];
GndY = dblPoint[1];
}
// same as GeoTransform.GroundToImage(), but much faster using stored values...
ImgX = (geoLeft + geoHorzPixRes * GndX + geoXRot * GndY);
ImgY = (geoTop + geoYRot * GndX + geoVertPixRes * GndY);
if (ImgX < imageTL.X || ImgX > imageBR.X || ImgY < imageTL.Y || ImgY > imageBR.Y)
continue;
// color correction
for (int i = 0; i < Bands; i++)
{
intVal[i] =
buffer[i][(int)((ImgX - imageLeft) / dblXScale)][
(int)((ImgY - imageTop) / dblYScale)];
imageVal = SpotVal = intVal[i] = intVal[i] / bitScalar;
if (ch[i] == 4)
{
if (imageVal != noDataValues[i])
{
Color color = _colorBlend.GetColor(Convert.ToSingle(imageVal));
intVal[0] = color.B;
intVal[1] = color.G;
intVal[2] = color.R;
//intVal[3] = ce.c4;
}
else
{
intVal[0] = cb;
intVal[1] = cg;
intVal[2] = cr;
}
}
else if (ch[i] == 5 && colorTable != null)
{
if (imageVal != noDataValues[i])
{
ColorEntry ce = colorTable.GetColorEntry(Convert.ToInt32(imageVal));
intVal[0] = ce.c3;
intVal[1] = ce.c2;
intVal[2] = ce.c1;
//intVal[3] = ce.c4;
}
else
{
intVal[0] = cb;
intVal[1] = cg;
intVal[2] = cr;
}
}
else
{
if (_colorCorrect)
{
intVal[i] = ApplyColorCorrection(imageVal, SpotVal, ch[i], GndX, GndY);
// if pixel is within ground boundary, add its value to the histogram
if (ch[i] != -1 && intVal[i] > 0 && (_histoBounds.Bottom >= (int)GndY) &&
_histoBounds.Top <= (int)GndY &&
_histoBounds.Left <= (int)GndX && _histoBounds.Right >= (int)GndX)
{
_histogram[ch[i]][(int)intVal[i]]++;
}
}
if (intVal[i] > 255)
intVal[i] = 255;
}
}
// luminosity
if (_lbands >= 3)
_histogram[_lbands][(int)(intVal[2] * 0.2126 + intVal[1] * 0.7152 + intVal[0] * 0.0722)]
++;
WritePixel(PixX, intVal, iPixelSize, ch, row);
}
}
}
}
finally
{
bitmap.UnlockBits(bitmapData);
}
}
bitmap.MakeTransparent(_noDataInitColor);
if (_transparentColor != Color.Empty)
bitmap.MakeTransparent(_transparentColor);
g.DrawImage(bitmap, new Point(bitmapTL.X, bitmapTL.Y));
}
private void GetPreview(GDAL.Dataset dataset, System.Drawing.Size size, Graphics g, SharpMap.Geometries.BoundingBox bbox)
{
double [] geoTrans = new double[6];
dataset.GetGeoTransform(geoTrans);
GeoTransform GT = new GeoTransform(geoTrans);
int DsWidth = dataset.RasterXSize;
int DsHeight = dataset.RasterYSize;
Bitmap bitmap = new Bitmap(size.Width, size.Height, PixelFormat.Format24bppRgb);
int iPixelSize = 3; //Format24bppRgb = byte[b,g,r]
if (dataset != null)
{
/*
* if ((float)size.Width / (float)size.Height > (float)DsWidth / (float)DsHeight)
* size.Width = size.Height * DsWidth / DsHeight;
* else
* size.Height = size.Width * DsHeight / DsWidth;
*/
double left = Math.Max(bbox.Left, _Envelope.Left);
double top = Math.Min(bbox.Top, _Envelope.Top);
double right = Math.Min(bbox.Right, _Envelope.Right);
double bottom = Math.Max(bbox.Bottom, _Envelope.Bottom);
int x1 = (int)GT.PixelX(left);
int y1 = (int)GT.PixelY(top);
int x1width = (int)GT.PixelXwidth(right - left);
int y1height = (int)GT.PixelYwidth(bottom - top);
bitmap = new Bitmap(size.Width, size.Height, PixelFormat.Format24bppRgb);
BitmapData bitmapData = bitmap.LockBits(new Rectangle(0, 0, size.Width, size.Height), ImageLockMode.ReadWrite, bitmap.PixelFormat);
try
{
unsafe
{
for (int i = 1; i <= (dataset.RasterCount > 3 ? 3 : dataset.RasterCount); ++i)
{
byte[] buffer = new byte[size.Width * size.Height];
GDAL.Band band = dataset.GetRasterBand(i);
//band.ReadRaster(x1, y1, x1width, y1height, buffer, size.Width, size.Height, (int)GT.HorizontalPixelResolution, (int)GT.VerticalPixelResolution);
band.ReadRaster(x1, y1, x1width, y1height, buffer, size.Width, size.Height, 0, 0);
int p_indx = 0;
int ch = 0;
if (band.GetRasterColorInterpretation() == 5)
{
ch = 0;
}
if (band.GetRasterColorInterpretation() == 4)
{
ch = 1;
}
if (band.GetRasterColorInterpretation() == 3)
{
ch = 2;
}
if (band.GetRasterColorInterpretation() != 2)
{
for (int y = 0; y < size.Height; y++)
{
byte *row = (byte *)bitmapData.Scan0 + (y * bitmapData.Stride);
for (int x = 0; x < size.Width; x++, p_indx++)
{
row[x * iPixelSize + ch] = buffer[p_indx];
}
}
}
else //8bit Grayscale
{
for (int y = 0; y < size.Height; y++)
{
byte *row = (byte *)bitmapData.Scan0 + (y * bitmapData.Stride);
for (int x = 0; x < size.Width; x++, p_indx++)
{
row[x * iPixelSize] = buffer[p_indx];
row[x * iPixelSize + 1] = buffer[p_indx];
row[x * iPixelSize + 2] = buffer[p_indx];
}
}
}
}
}
}
finally
{
bitmap.UnlockBits(bitmapData);
}
}
g.DrawImage(bitmap, new System.Drawing.Point(0, 0));
}
// add image pixels to the map
protected virtual void GetPreview(Dataset dataset, System.Drawing.Size size, System.Drawing.Graphics g,
BoundingBox displayBbox, ICoordinateSystem mapProjection, Map map)
{
double[] geoTrans = new double[6];
_GdalDataset.GetGeoTransform(geoTrans);
// not rotated, use faster display method
if ((!_useRotation || (geoTrans[1] == 1 && geoTrans[2] == 0 && geoTrans[4] == 0 && Math.Abs(geoTrans[5]) == 1))
&& !_haveSpot && _transform == null)
{
GetNonRotatedPreview(dataset, size, g, displayBbox, mapProjection);
return;
}
// not rotated, but has spot...need default rotation
else if ((geoTrans[0] == 0 && geoTrans[3] == 0) && _haveSpot)
geoTrans = new double[] { 999.5, 1, 0, 1000.5, 0, -1 };
GT = new GeoTransform(geoTrans);
double DsWidth = _imagesize.Width;
double DsHeight = _imagesize.Height;
double left, top, right, bottom;
double GndX = 0, GndY = 0, ImgX = 0, ImgY = 0, PixX, PixY;
double[] intVal = new double[Bands];
double imageVal = 0, SpotVal = 0;
double bitScalar = 1.0;
Bitmap bitmap = null;
GdiPoint bitmapTL = new GdiPoint(), bitmapBR = new GdiPoint();
SMPoint imageTL = new SMPoint(), imageBR = new SMPoint();
BoundingBox shownImageBbox, trueImageBbox;
int bitmapLength, bitmapHeight;
int displayImageLength, displayImageHeight;
int iPixelSize = 3; //Format24bppRgb = byte[b,g,r]
if (dataset != null)
{
//check if image is in bounding box
if ((displayBbox.Left > _Envelope.Right) || (displayBbox.Right < _Envelope.Left)
|| (displayBbox.Top < _Envelope.Bottom) || (displayBbox.Bottom > _Envelope.Top))
return;
// init histo
_histogram = new List<int[]>();
for (int i = 0; i < _lbands + 1; i++)
_histogram.Add(new int[256]);
// bounds of section of image to be displayed
left = Math.Max(displayBbox.Left, _Envelope.Left);
top = Math.Min(displayBbox.Top, _Envelope.Top);
right = Math.Min(displayBbox.Right, _Envelope.Right);
bottom = Math.Max(displayBbox.Bottom, _Envelope.Bottom);
trueImageBbox = new BoundingBox(left, bottom, right, top);
// put display bounds into current projection
if (_transform != null)
shownImageBbox = GeometryTransform.TransformBox(trueImageBbox, _transform.MathTransform.Inverse());
else
shownImageBbox = trueImageBbox;
// find min/max x and y pixels needed from image
imageBR.X = (int)(Math.Max(GT.GroundToImage(shownImageBbox.TopLeft).X, Math.Max(GT.GroundToImage(shownImageBbox.TopRight).X,
Math.Max(GT.GroundToImage(shownImageBbox.BottomLeft).X, GT.GroundToImage(shownImageBbox.BottomRight).X))) + 1);
imageBR.Y = (int)(Math.Max(GT.GroundToImage(shownImageBbox.TopLeft).Y, Math.Max(GT.GroundToImage(shownImageBbox.TopRight).Y,
Math.Max(GT.GroundToImage(shownImageBbox.BottomLeft).Y, GT.GroundToImage(shownImageBbox.BottomRight).Y))) + 1);
imageTL.X = (int)Math.Min(GT.GroundToImage(shownImageBbox.TopLeft).X, Math.Min(GT.GroundToImage(shownImageBbox.TopRight).X,
Math.Min(GT.GroundToImage(shownImageBbox.BottomLeft).X, GT.GroundToImage(shownImageBbox.BottomRight).X)));
imageTL.Y = (int)Math.Min(GT.GroundToImage(shownImageBbox.TopLeft).Y, Math.Min(GT.GroundToImage(shownImageBbox.TopRight).Y,
Math.Min(GT.GroundToImage(shownImageBbox.BottomLeft).Y, GT.GroundToImage(shownImageBbox.BottomRight).Y)));
// stay within image
if (imageBR.X > _imagesize.Width)
imageBR.X = _imagesize.Width;
if (imageBR.Y > _imagesize.Height)
imageBR.Y = _imagesize.Height;
if (imageTL.Y < 0)
imageTL.Y = 0;
if (imageTL.X < 0)
imageTL.X = 0;
displayImageLength = (int)(imageBR.X - imageTL.X);
displayImageHeight = (int)(imageBR.Y - imageTL.Y);
// find ground coordinates of image pixels
SMPoint groundBR = GT.ImageToGround(imageBR);
SMPoint groundTL = GT.ImageToGround(imageTL);
// convert ground coordinates to map coordinates to figure out where to place the bitmap
bitmapBR = new GdiPoint((int)map.WorldToImage(trueImageBbox.BottomRight).X + 1, (int)map.WorldToImage(trueImageBbox.BottomRight).Y + 1);
bitmapTL = new GdiPoint((int)map.WorldToImage(trueImageBbox.TopLeft).X, (int)map.WorldToImage(trueImageBbox.TopLeft).Y);
bitmapLength = bitmapBR.X - bitmapTL.X;
bitmapHeight = bitmapBR.Y - bitmapTL.Y;
// check to see if image is on its side
if (bitmapLength > bitmapHeight && displayImageLength < displayImageHeight)
{
displayImageLength = bitmapHeight;
displayImageHeight = bitmapLength;
}
else
{
displayImageLength = bitmapLength;
displayImageHeight = bitmapHeight;
}
// scale
if (_bitDepth == 12)
bitScalar = 16.0;
else if (_bitDepth == 16)
bitScalar = 256.0;
else if (_bitDepth == 32)
bitScalar = 16777216.0;
// 0 pixels in length or height, nothing to display
if (bitmapLength < 1 || bitmapHeight < 1)
return;
//initialize bitmap
bitmap = new Bitmap(bitmapLength, bitmapHeight, PixelFormat.Format24bppRgb);
BitmapData bitmapData = bitmap.LockBits(new Rectangle(0, 0, bitmapLength, bitmapHeight), ImageLockMode.ReadWrite, bitmap.PixelFormat);
try
{
unsafe
{
// turn everything yellow, so we can make fill transparent
for (int y = 0; y < bitmapHeight; y++)
{
byte* brow = (byte*)bitmapData.Scan0 + (y * bitmapData.Stride);
for (int x = 0; x < bitmapLength; x++)
{
brow[x * 3 + 0] = 0;
brow[x * 3 + 1] = 255;
brow[x * 3 + 2] = 255;
}
}
// create 3 dimensional buffer [band][x pixel][y pixel]
double[][] tempBuffer = new double[Bands][];
double[][][] buffer = new double[Bands][][];
for (int i = 0; i < Bands; i++)
{
buffer[i] = new double[displayImageLength][];
for (int j = 0; j < displayImageLength; j++)
buffer[i][j] = new double[displayImageHeight];
}
Band[] band = new Band[Bands];
int[] ch = new int[Bands];
// get data from image
for (int i = 0; i < Bands; i++)
{
tempBuffer[i] = new double[displayImageLength * displayImageHeight];
band[i] = dataset.GetRasterBand(i + 1);
band[i].ReadRaster(
(int)imageTL.X,
(int)imageTL.Y,
(int)(imageBR.X - imageTL.X),
(int)(imageBR.Y - imageTL.Y),
tempBuffer[i], displayImageLength, displayImageHeight, 0, 0);
// parse temp buffer into the image x y value buffer
long pos = 0;
for (int y = 0; y < displayImageHeight; y++)
{
for (int x = 0; x < displayImageLength; x++, pos++)
buffer[i][x][y] = tempBuffer[i][pos];
}
if (band[i].GetRasterColorInterpretation() == ColorInterp.GCI_BlueBand) ch[i] = 0;
else if (band[i].GetRasterColorInterpretation() == ColorInterp.GCI_GreenBand) ch[i] = 1;
else if (band[i].GetRasterColorInterpretation() == ColorInterp.GCI_RedBand) ch[i] = 2;
else if (band[i].GetRasterColorInterpretation() == ColorInterp.GCI_Undefined) ch[i] = 3; // infrared
else if (band[i].GetRasterColorInterpretation() == ColorInterp.GCI_GrayIndex) ch[i] = 0;
else ch[i] = -1;
}
// store these values to keep from having to make slow method calls
int bitmapTLX = bitmapTL.X;
int bitmapTLY = bitmapTL.Y;
double imageTop = imageTL.Y;
double imageLeft = imageTL.X;
double dblMapPixelWidth = map.PixelWidth;
double dblMapPixelHeight = map.PixelHeight;
double dblMapMinX = map.Envelope.Min.X;
double dblMapMaxY = map.Envelope.Max.Y;
double geoTop, geoLeft, geoHorzPixRes, geoVertPixRes, geoXRot, geoYRot;
// get inverse values
geoTop = GT.Inverse[3];
geoLeft = GT.Inverse[0];
geoHorzPixRes = GT.Inverse[1];
geoVertPixRes = GT.Inverse[5];
geoXRot = GT.Inverse[2];
geoYRot = GT.Inverse[4];
double dblXScale = (imageBR.X - imageTL.X) / (displayImageLength - 1);
double dblYScale = (imageBR.Y - imageTL.Y) / (displayImageHeight - 1);
double[] dblPoint;
// get inverse transform
// NOTE: calling transform.MathTransform.Inverse() once and storing it
// is much faster than having to call every time it is needed
IMathTransform inverseTransform = null;
if (_transform != null)
inverseTransform = _transform.MathTransform.Inverse();
for (PixY = 0; PixY < bitmapBR.Y - bitmapTL.Y; PixY++)
{
byte* row = (byte*)bitmapData.Scan0 + ((int)Math.Round(PixY) * bitmapData.Stride);
for (PixX = 0; PixX < bitmapBR.X - bitmapTL.X; PixX++)
{
// same as Map.ImageToGround(), but much faster using stored values...rather than called each time
GndX = dblMapMinX + (PixX + (double)bitmapTLX) * dblMapPixelWidth;
GndY = dblMapMaxY - (PixY + (double)bitmapTLY) * dblMapPixelHeight;
// transform ground point if needed
if (_transform != null)
{
dblPoint = inverseTransform.Transform(new double[] { GndX, GndY });
GndX = dblPoint[0];
GndY = dblPoint[1];
}
// same as GeoTransform.GroundToImage(), but much faster using stored values...
ImgX = (geoLeft + geoHorzPixRes * GndX + geoXRot * GndY);
ImgY = (geoTop + geoYRot * GndX + geoVertPixRes * GndY);
if (ImgX < imageTL.X || ImgX > imageBR.X || ImgY < imageTL.Y || ImgY > imageBR.Y)
continue;
// color correction
for (int i = 0; i < Bands; i++)
{
intVal[i] = buffer[i][(int)((ImgX - imageLeft) / dblXScale)][(int)((ImgY - imageTop) / dblYScale)];
imageVal = SpotVal = intVal[i] = intVal[i] / bitScalar;
if (_colorCorrect)
{
intVal[i] = ApplyColorCorrection(imageVal, SpotVal, ch[i], GndX, GndY);
// if pixel is within ground boundary, add its value to the histogram
if (ch[i] != -1 && intVal[i] > 0 && (_histoBounds.Bottom >= (int)GndY) && _histoBounds.Top <= (int)GndY &&
_histoBounds.Left <= (int)GndX && _histoBounds.Right >= (int)GndX)
{
_histogram[ch[i]][(int)intVal[i]]++;
}
}
if (intVal[i] > 255)
intVal[i] = 255;
}
// luminosity
if (_lbands >= 3)
_histogram[_lbands][(int)(intVal[2] * 0.2126 + intVal[1] * 0.7152 + intVal[0] * 0.0722)]++;
WritePixel(PixX, intVal, iPixelSize, ch, row);
}
}
}
}
finally
{
bitmap.UnlockBits(bitmapData);
}
}
bitmap.MakeTransparent(Color.Yellow);
if (_transparentColor != Color.Empty)
bitmap.MakeTransparent(_transparentColor);
g.DrawImage(bitmap, new System.Drawing.Point(bitmapTL.X, bitmapTL.Y));
}
// get boundary of raster
private BoundingBox GetExtent()
{
if (_gdalDataset != null)
{
double right = 0, left = 0, top = 0, bottom = 0;
double dblW, dblH;
double[] geoTrans = new double[6];
_gdalDataset.GetGeoTransform(geoTrans);
// no rotation...use default transform
if (!_useRotation && !_haveSpot || (geoTrans[0] == 0 && geoTrans[3] == 0))
geoTrans = new[] { 999.5, 1, 0, 1000.5, 0, -1 };
_geoTransform = new GeoTransform(geoTrans);
// image pixels
dblW = _imagesize.Width;
dblH = _imagesize.Height;
left = _geoTransform.EnvelopeLeft(dblW, dblH);
right = _geoTransform.EnvelopeRight(dblW, dblH);
top = _geoTransform.EnvelopeTop(dblW, dblH);
bottom = _geoTransform.EnvelopeBottom(dblW, dblH);
return new BoundingBox(left, bottom, right, top);
}
return null;
}
// faster than rotated display
private void GetNonRotatedPreview(Dataset dataset, Size size, Graphics g, BoundingBox bbox, ICoordinateSystem mapProjection)
{
double[] geoTrans = new double[6];
dataset.GetGeoTransform(geoTrans);
// default transform
if (!_useRotation && !_haveSpot || (geoTrans[0] == 0 && geoTrans[3] == 0))
geoTrans = new double[] { 999.5, 1, 0, 1000.5, 0, -1 };
Bitmap bitmap = null;
GT = new GeoTransform(geoTrans);
int DsWidth = 0;
int DsHeight = 0;
BitmapData bitmapData = null;
double[] intVal = new double[Bands];
int p_indx;
double bitScalar = 1.0;
double dblImginMapW = 0, dblImginMapH = 0, dblLocX = 0, dblLocY = 0;
int iPixelSize = 3; //Format24bppRgb = byte[b,g,r]
if (dataset != null)
{
//check if image is in bounding box
if ((bbox.Left > _Envelope.Right) || (bbox.Right < _Envelope.Left)
|| (bbox.Top < _Envelope.Bottom) || (bbox.Bottom > _Envelope.Top))
return;
DsWidth = _imagesize.Width;
DsHeight = _imagesize.Height;
_histogram = new List<int[]>();
for (int i = 0; i < _lbands + 1; i++)
_histogram.Add(new int[256]);
double left = Math.Max(bbox.Left, _Envelope.Left);
double top = Math.Min(bbox.Top, _Envelope.Top);
double right = Math.Min(bbox.Right, _Envelope.Right);
double bottom = Math.Max(bbox.Bottom, _Envelope.Bottom);
double x1 = Math.Abs(GT.PixelX(left));
double y1 = Math.Abs(GT.PixelY(top));
double imgPixWidth = GT.PixelXwidth(right - left);
double imgPixHeight = GT.PixelYwidth(bottom - top);
//get screen pixels image should fill
double dblBBoxW = bbox.Right - bbox.Left;
double dblBBoxtoImgPixX = (double)imgPixWidth / (double)dblBBoxW;
dblImginMapW = (double)size.Width * dblBBoxtoImgPixX * GT.HorizontalPixelResolution;
double dblBBoxH = bbox.Top - bbox.Bottom;
double dblBBoxtoImgPixY = (double)imgPixHeight / (double)dblBBoxH;
dblImginMapH = (double)size.Height * dblBBoxtoImgPixY * -GT.VerticalPixelResolution;
if ((dblImginMapH == 0) || (dblImginMapW == 0))
return;
// ratios of bounding box to image ground space
double dblBBoxtoImgX = (double)size.Width / dblBBoxW;
double dblBBoxtoImgY = (double)size.Height / dblBBoxH;
// set where to display bitmap in Map
if (bbox.Left != left)
{
if (bbox.Right != right)
dblLocX = (_Envelope.Left - bbox.Left) * dblBBoxtoImgX;
else
dblLocX = (double)size.Width - dblImginMapW;
}
if (bbox.Top != top)
{
if (bbox.Bottom != bottom)
dblLocY = (bbox.Top - _Envelope.Top) * dblBBoxtoImgY;
else
dblLocY = (double)size.Height - dblImginMapH;
}
// scale
if (_bitDepth == 12)
bitScalar = 16.0;
else if (_bitDepth == 16)
bitScalar = 256.0;
else if (_bitDepth == 32)
bitScalar = 16777216.0;
try
{
bitmap = new Bitmap((int)Math.Round(dblImginMapW), (int)Math.Round(dblImginMapH), PixelFormat.Format24bppRgb);
bitmapData = bitmap.LockBits(new Rectangle(0, 0, (int)Math.Round(dblImginMapW), (int)Math.Round(dblImginMapH)), ImageLockMode.ReadWrite, bitmap.PixelFormat);
unsafe
{
double[][] buffer = new double[Bands][];
Band[] band = new Band[Bands];
int[] ch = new int[Bands];
// get data from image
for (int i = 0; i < Bands; i++)
{
buffer[i] = new double[(int)Math.Round(dblImginMapW) * (int)Math.Round(dblImginMapH)];
band[i] = dataset.GetRasterBand(i + 1);
band[i].ReadRaster((int)Math.Round(x1), (int)Math.Round(y1), (int)Math.Round(imgPixWidth), (int)Math.Round(imgPixHeight),
buffer[i], (int)Math.Round(dblImginMapW), (int)Math.Round(dblImginMapH), 0, 0);
if (band[i].GetRasterColorInterpretation() == ColorInterp.GCI_BlueBand) ch[i] = 0;
else if (band[i].GetRasterColorInterpretation() == ColorInterp.GCI_GreenBand) ch[i] = 1;
else if (band[i].GetRasterColorInterpretation() == ColorInterp.GCI_RedBand) ch[i] = 2;
else if (band[i].GetRasterColorInterpretation() == ColorInterp.GCI_Undefined) ch[i] = 3; // infrared
else if (band[i].GetRasterColorInterpretation() == ColorInterp.GCI_GrayIndex) ch[i] = 4;
else ch[i] = -1;
}
if (_bitDepth == 32)
ch = new int[] { 0, 1, 2 };
p_indx = 0;
for (int y = 0; y < Math.Round(dblImginMapH); y++)
{
byte* row = (byte*)bitmapData.Scan0 + (y * bitmapData.Stride);
for (int x = 0; x < Math.Round(dblImginMapW); x++, p_indx++)
{
for (int i = 0; i < Bands; i++)
{
intVal[i] = buffer[i][p_indx] / bitScalar;
if (_colorCorrect)
{
intVal[i] = ApplyColorCorrection(intVal[i], 0, ch[i], 0, 0);
if (_lbands >= 3)
_histogram[_lbands][(int)(intVal[2] * 0.2126 + intVal[1] * 0.7152 + intVal[0] * 0.0722)]++;
}
if (intVal[i] > 255)
intVal[i] = 255;
}
WritePixel(x, intVal, iPixelSize, ch, row);
}
}
}
}
catch
{
return;
}
finally
{
if (bitmapData != null)
bitmap.UnlockBits(bitmapData);
}
}
if (_transparentColor != Color.Empty)
bitmap.MakeTransparent(_transparentColor);
g.DrawImage(bitmap, new System.Drawing.Point((int)Math.Round(dblLocX), (int)Math.Round(dblLocY)));
}
protected override void ReleaseManagedResources()
{
_factory = null;
_geoTransform = null;
_gdalDataset.Dispose();
_gdalDataset = null;
base.ReleaseManagedResources();
}
private void GetPreview(OSGeo.GDAL.Dataset dataset, System.Drawing.Size size, Graphics g, IEnvelope bbox)
{
double[] geoTrans = new double[6];
dataset.GetGeoTransform(geoTrans);
GeoTransform GT = new GeoTransform(geoTrans);
int DsWidth = dataset.RasterXSize;
int DsHeight = dataset.RasterYSize;
Bitmap bitmap = new Bitmap(size.Width, size.Height, PixelFormat.Format24bppRgb);
int iPixelSize = 3; //Format24bppRgb = byte[b,g,r]
if (dataset != null)
{
/*
if ((float)size.Width / (float)size.Height > (float)DsWidth / (float)DsHeight)
size.Width = size.Height * DsWidth / DsHeight;
else
size.Height = size.Width * DsHeight / DsWidth;
*/
double left = Math.Max(bbox.MinX, _Envelope.MinX);
double top = Math.Min(bbox.MaxY, _Envelope.MaxY);
double right = Math.Min(bbox.MaxX, _Envelope.MaxX);
double bottom = Math.Max(bbox.MinY, _Envelope.MinY);
int x1 = (int)GT.PixelX(left);
int y1 = (int)GT.PixelY(top);
int x1width = (int)GT.PixelXwidth(right - left);
int y1height = (int)GT.PixelYwidth(bottom - top);
bitmap = new Bitmap(size.Width, size.Height, PixelFormat.Format24bppRgb);
BitmapData bitmapData = bitmap.LockBits(new Rectangle(0, 0, size.Width, size.Height), ImageLockMode.ReadWrite, bitmap.PixelFormat);
try
{
unsafe
{
for (int i = 1; i <= (dataset.RasterCount > 3 ? 3 : dataset.RasterCount); ++i)
{
byte[] buffer = new byte[size.Width * size.Height];
OSGeo.GDAL.Band band = dataset.GetRasterBand(i);
//band.ReadRaster(x1, y1, x1width, y1height, buffer, size.Width, size.Height, (int)GT.HorizontalPixelResolution, (int)GT.VerticalPixelResolution);
band.ReadRaster(x1, y1, x1width, y1height, buffer, size.Width, size.Height, 0, 0);
int p_indx = 0;
int ch = 0;
//#warning Check correspondance between enum and integer values
if (band.GetRasterColorInterpretation() == OSGeo.GDAL.ColorInterp.GCI_BlueBand) ch = 0;
if (band.GetRasterColorInterpretation() == OSGeo.GDAL.ColorInterp.GCI_GreenBand) ch = 1;
if (band.GetRasterColorInterpretation() == OSGeo.GDAL.ColorInterp.GCI_RedBand) ch = 2;
if (band.GetRasterColorInterpretation() != OSGeo.GDAL.ColorInterp.GCI_PaletteIndex)
{
for (int y = 0; y < size.Height; y++)
{
byte* row = (byte*)bitmapData.Scan0 + (y * bitmapData.Stride);
for (int x = 0; x < size.Width; x++, p_indx++)
{
row[x * iPixelSize + ch] = buffer[p_indx];
}
}
}
else //8bit Grayscale
{
for (int y = 0; y < size.Height; y++)
{
byte* row = (byte*)bitmapData.Scan0 + (y * bitmapData.Stride);
for (int x = 0; x < size.Width; x++, p_indx++)
{
row[x * iPixelSize] = buffer[p_indx];
row[x * iPixelSize + 1] = buffer[p_indx];
row[x * iPixelSize + 2] = buffer[p_indx];
}
}
}
}
}
}
finally
{
bitmap.UnlockBits(bitmapData);
}
}
g.DrawImage(bitmap, new System.Drawing.Point(0, 0));
}
private IEnvelope GetExtent()
{
if (_GdalDataset != null)
{
double[] geoTrans = new double[6];
_GdalDataset.GetGeoTransform(geoTrans);
GeoTransform GT = new GeoTransform(geoTrans);
return SharpMap.Converters.Geometries.GeometryFactory.CreateEnvelope(GT.Left,
GT.Top + (GT.VerticalPixelResolution * _GdalDataset.RasterYSize),
GT.Left + (GT.HorizontalPixelResolution * _GdalDataset.RasterXSize),
GT.Top);
}
return null;
}
private SharpMap.Geometries.BoundingBox GetExtent()
{
if(_GdalDataset!=null)
{
double [] geoTrans = new double[6];
_GdalDataset.GetGeoTransform(geoTrans);
GeoTransform GT = new GeoTransform(geoTrans);
return new SharpMap.Geometries.BoundingBox( GT.Left,
GT.Top + (GT.VerticalPixelResolution * _GdalDataset.RasterYSize),
GT.Left + (GT.HorizontalPixelResolution * _GdalDataset.RasterXSize),
GT.Top);
}
return null;
}
