public byte[] GenerateTile(int x, int y, int zoom)
{
byte[] tileBytes = null;
var font = SixLabors.Fonts.SystemFonts.CreateFont("Arial", 12);
var corner = TileUtils.TileXYToGlobalPixel(x, y, TileSize);
var latLong = TileUtils.GlobalPixelToPosition(new Point <double>(corner.X, corner.Y), zoom, TileSize);
var latLongOffset = TileUtils.GlobalPixelToPosition(new Point <double>(corner.X + TileSize, corner.Y + TileSize), zoom, TileSize);
var graticules = graticuleService.DrawCore(latLong, latLongOffset);
using (Image <Rgba32> outputImage = new Image <Rgba32>(this.TileSize, this.TileSize))
{
string tileText = $"{x}/{y}/{zoom}{Environment.NewLine}";
outputImage.Mutate(o => o
.Fill(Rgba32.White)
.DrawText(tileText, font, Rgba32.Black, new PointF(10, 10))
);
outputImage.Mutate(o => DrawGraticules(o, graticules, corner, zoom));
// Test
if (DebugPoint != null)
{
var testPixel = TileUtils.PositionToGlobalPixel(new LatLong(DebugPoint.Latitude, DebugPoint.Longitude), zoom, TileSize);
var testTile = TileUtils.GlobalPixelToTileXY(testPixel.X, testPixel.Y, TileSize);
// Draw test pixel
if (testTile.X == x && testTile.Y == y)
{
var basex = TileUtils.TileXYToGlobalPixel(x, y, TileSize);
var ptLoc = new PointF((float)(testPixel.X - basex.X), (float)(testPixel.Y - basex.Y));
outputImage.Mutate(o =>
o.DrawLines(Rgba32.Blue, 1f,
new PointF[] { new PointF(ptLoc.X - 10, ptLoc.Y - 10), new PointF(ptLoc.X + 10, ptLoc.Y + 10) })
.DrawLines(Rgba32.Blue, 1f,
new PointF[] { new PointF(ptLoc.X - 10, ptLoc.Y + 10), new PointF(ptLoc.X + 10, ptLoc.Y - 10) }));
}
}
using (MemoryStream ms = new MemoryStream())
{
outputImage.SaveAsPng(ms);
tileBytes = ms.ToArray();
}
}
return(tileBytes);
}