/// <summary>
/// Creates the tile specified by level.
/// </summary>
/// <param name="level">
/// Zoom level.
/// </param>
/// <param name="tileX">
/// X tile coordinate.
/// </param>
/// <param name="tileY">
/// Y tile coordinate.
/// </param>
public void Create(int level, int tileX, int tileY)
{
// Pre-compute tables to map from pixel position to global (longitude, latitude).
// Map size at this level.
double tileSize = (double)(((long)Constants.TileSize) << level);
// Compute longitudes across the tile (px = 0 at left edge);
double[] longitudes = new double[Constants.TileSize];
long pixelX = checked (tileX * Constants.TileSize);
for (int px = 0; px < Constants.TileSize; px++)
{
double x = ((pixelX + px) + 0.5) / tileSize;
longitudes[px] = 360.0 * x - 180.0;
}
// Compute latitudes across the tile (py = 0 at top edge).
double[] latitudes = new double[Constants.TileSize];
long pixelY = checked (tileY * Constants.TileSize);
for (int py = 0; py < Constants.TileSize; py++)
{
double y = 0.5 - (((pixelY + py) + 0.5) / tileSize);
latitudes[py] = 90.0 - (360.0 * Math.Atan(Math.Exp(-y * 2.0 * Math.PI)) / Math.PI);
}
int[] colors = new int[Constants.TileSize * Constants.TileSize];
bool hasData = false;
int position = -1;
for (int py = 0; py < Constants.TileSize; py++)
{
for (int px = 0; px < Constants.TileSize; px++)
{
// Map geo location to an ARGB value.
Color color = this.ColorMap.GetColor(longitudes[px], latitudes[py]);
// Store and update bit indicating whether actual data is present or not.
position++;
colors[position] = color.ToArgb();
if (hasData == false)
{
hasData = (color != Color.Transparent);
}
}
}
if (hasData)
{
TileHelper.ToBitmap(level, tileX, tileY, colors, this.TileSerializer);
}
colors = null;
longitudes = null;
latitudes = null;
}
/// <summary>
/// Creates the tile specified by level.
/// </summary>
/// <param name="level">
/// Zoom level.
/// </param>
/// <param name="tileX">
/// X tile coordinate.
/// </param>
/// <param name="tileY">
/// Y tile coordinate.
/// </param>
public void Create(int level, int tileX, int tileY)
{
// Map to convert from pixel position to global (longitude, latitude).
OctTileMap tileMap = new OctTileMap(level, tileX, tileY);
int[] colors = new int[Constants.TileSize * Constants.TileSize];
bool hasData = false;
int position = -1;
for (int pixelY = 0; pixelY < Constants.TileSize; pixelY++)
{
for (int pixelX = 0; pixelX < Constants.TileSize; pixelX++)
{
// Map pixel (u, v) position to (longitude, latitude).
double u = (0.5 + pixelX) / ((double)Constants.TileSize);
double v = (0.5 + pixelY) / ((double)Constants.TileSize);
Vector2d location = tileMap.PointToRaDec(new Vector2d(u, v));
double latitude = location.Y;
double longitude = location.X;
// For Toast projection, Longitude spans from 0 to +360 and latitude from +90 to -90.
// So we need to convert from -180 to +180 => 0 to +360.
longitude -= 180.0;
// Map geo location to an ARGB value.
Color color = this.ColorMap.GetColor(longitude, latitude);
// Store and update bit indicating whether actual data is present or not.
position++;
colors[position] = color.ToArgb();
if (hasData == false)
{
hasData = (color != Color.Transparent);
}
}
}
if (hasData)
{
TileHelper.ToBitmap(level, tileX, tileY, colors, this.TileSerializer);
}
colors = null;
}
public static void ToBitmap(int level, int tileX, int tileY, int[] values, IImageTileSerializer serializer)
{
TileHelper.ToBitmap(level, tileX, tileY, values, serializer, null);
}
