private static Bitmap ReadTile(int lon, int lat)
{
DTEDFile dted = new DTEDFile();
using (FileStream fs = File.OpenRead(string.Format(@"Data\dted\e0{0}\n{1}.dt0", lon, lat)))
dted.Read(fs);
UserHeaderLabel uhl = dted.UHL;
Bitmap bmp = new Bitmap(tileWidth, tileHeight);
BitmapData bmpData = bmp.LockBits(new Rectangle(0, 0, tileWidth, tileHeight), ImageLockMode.WriteOnly, PixelFormat.Format32bppArgb);
byte[] data = new byte[bmpData.Stride * bmpData.Height];
for (int y = 0; y < tileHeight; ++y)
{
for (int x = 0; x < tileWidth; ++x)
{
int value = dted.GetElevation(x, y);
Color col = s_terrainPalette[value + 500];
int pixelOffset = (tileHeight - y - 1) * bmpData.Stride + x * 4;
data[pixelOffset + 0] = col.B;
data[pixelOffset + 1] = col.G;
data[pixelOffset + 2] = col.R;
data[pixelOffset + 3] = 255;
}
}
Marshal.Copy(data, 0, bmpData.Scan0, data.Length);
bmp.UnlockBits(bmpData);
return bmp;
}
private void ScanDTED(int lon, int lat)
{
DTEDFile dted = new DTEDFile();
using (FileStream fs = File.OpenRead(string.Format(@"Data\dted\e0{0}\n{1}.dt0", lon, lat)))
dted.Read(fs);
int[,] data = new int[tileHeight + 2, tileWidth + 2];
bool[,] visitMask = new bool[tileHeight + 2, tileWidth + 2];
for (int y = 0; y < tileHeight + 2; ++y)
{
data[y, 0] = int.MinValue;
data[y, tileWidth + 1] = int.MinValue;
}
for (int x = 0; x < tileWidth + 2; ++x)
{
data[0, x] = int.MinValue;
data[tileHeight + 1, x] = int.MinValue;
}
int min = int.MaxValue;
int max = int.MinValue;
for (int y = 0; y < tileHeight; ++y)
{
for (int x = 0; x < tileWidth; ++x)
{
int value = dted.GetElevation(x, y);
data[y + 1, x + 1] = value;
min = Math.Min(value, min);
max = Math.Max(value, max);
}
}
Bitmap bmp = new Bitmap((tileWidth + 2) * PixelSize, (tileHeight + 2) * PixelSize, PixelFormat.Format32bppArgb);
PictureBox pb = new PictureBox();
pb.Image = bmp;
pb.Width = (tileWidth + 2) * PixelSize;
pb.Height = (tileHeight + 2) * PixelSize;
pb.Top = 0;
pb.Left = 500;
Controls.Add(pb);
using (Graphics g = Graphics.FromImage(bmp))
{
int counter = 0;
//for (int h = max; h >= min; --h)
int h = 600;
{
//if (h % 300 != 0) continue;
for (int y = 0; y < tileHeight + 2; ++y)
for (int x = 0; x < tileWidth + 2; ++x)
visitMask[y, x] = false;
for (int y = 1; y <= tileHeight; ++y)
{
for (int x = 1; x <= tileWidth; ++x)
{
Rectangle pixelRect = new Rectangle(x * PixelSize, (tileHeight - y) * PixelSize, PixelSize, PixelSize);
int value = data[y, x];
if (value < h)
g.FillRectangle(Brushes.Black, pixelRect);
else
g.FillRectangle(Brushes.Gray, pixelRect);
}
}
bool inside = false;
for (int y = 1; y <= tileHeight; ++y)
{
for (int x = 1; x <= tileWidth; ++x)
{
if (visitMask[y, x])
{
inside = true;
continue;
}
int value = data[y, x];
if (value < h)
inside = false;
else if (!inside)
{
counter++;
if (counter == 7)
return;
List<Point> vector = TryTrace(data, visitMask, g, x, y, h);
if (vector.Count == 1)
{
g.DrawEllipse(Pens.Blue, vector[0].X, vector[0].Y, PixelSize, PixelSize);
}
if (vector.Count > 2)
g.DrawPolygon(Pens.Blue, vector.ToArray());
inside = true;
}
}
}
}
}
}