public TileRange ComputeBoundingBoxTileRange(BoundingBox bbox, ImageryProvider provider, int minTilesPerImage = 4)
{
TileRange tiles = new TileRange(provider);
BoundingBox mapBbox;
PointInt topLeft;
PointInt bottomRight;
// optimal zoom calculation (maybe there's a direct way)
// calculate the size of the full bbox at increasing zoom levels
// until the full image would be greater than a tile
int zoom = 0;
int maxSize = provider.TileSize * minTilesPerImage;
do
{
zoom++;
// coords are pixels in global map image (see TileUtils.MapSize(zoom))
topLeft = TileUtils.LatLongToPixelXY(bbox.yMax, bbox.xMin, zoom);
bottomRight = TileUtils.LatLongToPixelXY(bbox.yMin, bbox.xMax, zoom);
mapBbox = new BoundingBox(topLeft.X, bottomRight.X, topLeft.Y, bottomRight.Y);
}while (zoom < provider.MaxZoom &&
(mapBbox.Width < maxSize || mapBbox.Height < maxSize));
// now we have the minimum zoom without image
// we can know which tiles are needed
tiles.Start = new MapTileInfo(TileUtils.PixelXYToTileXY(topLeft.X, topLeft.Y), zoom);
tiles.End = new MapTileInfo(TileUtils.PixelXYToTileXY(bottomRight.X, bottomRight.Y), zoom);
tiles.AreaOfInterest = mapBbox;
return(tiles);
}
BoundingBox ConvertWorldToMap(BoundingBox bbox, int zoomLevel)
{
var bboxTopLeft = TileUtils.LatLongToPixelXY(bbox.yMax, bbox.xMin, zoomLevel);
var bboxBottomRight = TileUtils.LatLongToPixelXY(bbox.yMin, bbox.xMax, zoomLevel);
return(new BoundingBox(bboxTopLeft.X, bboxBottomRight.X, bboxTopLeft.Y, bboxBottomRight.Y));
}
public List <Vector2> ComputeUVMap(HeightMap heightMap, TextureInfo textureInfo)
{
/**********************************
* We need to map texture pixels to heightmap points
* Linear mapping does not work because or Mercator projection distortion
* Pseudo code :
* for each point
* project to texture coordinates (pixelXY at same zoom than texture)
* get pixel offset from origin
* map this offset to (0 -> texWidth, 0 -> textHeight) => (0->1, 0->1)
*/
List <Vector2> uvs = new List <Vector2>(heightMap.Count);
var bbox = textureInfo.ProjectedBounds;
foreach (GeoPoint geoPoint in heightMap.Coordinates)
{
PointInt projPoint = TileUtils.LatLongToPixelXY(geoPoint.Latitude, geoPoint.Longitude, textureInfo.ProjectedZoom);
float xOffset = projPoint.X - (float)bbox.xMin;
float uvX = MathHelper.Map(1, textureInfo.Width, 0, 1, xOffset, true);
float yOffset = projPoint.Y - (float)bbox.yMin;
float uvY = MathHelper.Map(1, textureInfo.Height, 0, 1, yOffset, true);
uvs.Add(new Vector2(uvX, uvY));
}
return(uvs);
}
public TileRange DownloadTiles(BoundingBox bbox, ImageryProvider provider, int minTilesPerImage = 4)
{
TileRange tiles = new TileRange(provider);
BoundingBox mapBbox = null;
PointInt topLeft = new PointInt();
PointInt bottomRight = new PointInt();
// optimal zoom calculation (maybe there's a direct way)
// calculate the size of the full bbox at increasing zoom levels
// until the full image would be greater than a tile
int zoom = 0;
do
{
zoom++;
// coords are pixels in global map image (see TileUtils.MapSize(zoom))
topLeft = TileUtils.LatLongToPixelXY(bbox.yMax, bbox.xMin, zoom);
bottomRight = TileUtils.LatLongToPixelXY(bbox.yMin, bbox.xMax, zoom);
mapBbox = new BoundingBox(topLeft.X, bottomRight.X, topLeft.Y, bottomRight.Y);
}while (zoom < provider.MaxZoom &&
(mapBbox.Width < provider.TileSize * minTilesPerImage && mapBbox.Height < provider.TileSize * minTilesPerImage));
// now we have the minimum zoom without image
// we can know which tiles are needed
tiles.Start = new MapTileInfo(TileUtils.PixelXYToTileXY(topLeft.X, topLeft.Y), zoom);
tiles.End = new MapTileInfo(TileUtils.PixelXYToTileXY(bottomRight.X, bottomRight.Y), zoom);
tiles.AreaOfInterest = mapBbox;
// downdload tiles
Stopwatch swDownload = Stopwatch.StartNew();
_logger?.LogTrace("Starting images download");
// 2 max download threads
var options = new ParallelOptions()
{
MaxDegreeOfParallelism = provider.MaxDegreeOfParallelism
};
var range = tiles.EnumerateRange().ToList();
_logger.LogInformation($"Downloading {range.Count} tiles...");
Parallel.ForEach(range, options, tileInfo =>
{
Uri tileUri = BuildUri(provider, tileInfo.X, tileInfo.Y, tileInfo.Zoom);
_logger?.LogInformation($"Downloading {tileUri}");
var contentbytes = _httpClient.GetByteArrayAsync(tileUri).Result;
tiles.Add(new MapTile(contentbytes, provider.TileSize, tileUri, tileInfo));
}
);
swDownload.Stop();
_logger?.LogInformation($"DownloadImages done in : {swDownload.Elapsed:g}");
return(tiles);
}
public TextureInfo ConstructTextureWithGpxTrack(TileRange tiles, BoundingBox bbox, string fileName,
TextureImageFormat mimeType, IEnumerable <GeoPoint> gpxPoints, bool drawGpxVertices = false)
{
// where is the bbox in the final image ?
// get pixel in full map
int zoomLevel = tiles.Tiles.First().TileInfo.Zoom;
var projectedBbox = ConvertWorldToMap(bbox, zoomLevel);
var tilesBbox = GetTilesBoundingBox(tiles);
int xOffset = (int)(tilesBbox.xMin - projectedBbox.xMin);
int yOffset = (int)(tilesBbox.yMin - projectedBbox.yMin);
//DrawDebugBmpBbox(tiles, localBbox, tilesBbox, fileName, mimeType);
int tileSize = tiles.TileSize;
var pointsOnTexture = gpxPoints
.Select(pt => TileUtils.LatLongToPixelXY(pt.Latitude, pt.Longitude, zoomLevel))
.Select(pt => new PointF(pt.X - (int)projectedBbox.xMin, pt.Y - (int)projectedBbox.yMin));
using (Image <Rgba32> outputImage = new Image <Rgba32>((int)projectedBbox.Width, (int)projectedBbox.Height))
{
foreach (var tile in tiles.Tiles)
{
using (Image <Rgba32> tileImg = Image.Load(tile.Image))
{
int x = (tile.TileInfo.X - tiles.Start.X) * tileSize + xOffset;
int y = (tile.TileInfo.Y - tiles.Start.Y) * tileSize + yOffset;
outputImage.Mutate(o => o
.DrawImage(tileImg, new Point(x, y), 1f)
);
}
}
outputImage.Mutate(o => o
.DrawLines(new Rgba32(1, 0, 0, 1f), 5f, pointsOnTexture.ToArray())
);
if (drawGpxVertices)
{
PathCollection pc = new PathCollection(pointsOnTexture.Select(p => new EllipsePolygon(p, 10f)));
outputImage.Mutate(o => o.Draw(GraphicsOptions.Default, Pens.Solid(Rgba32.Violet, 3), pc));
}
// with encoder
//IImageEncoder encoder = ConvertFormat(mimeType);
//outputImage.Save(fileName, encoder);
outputImage.Save(fileName);
}
return(new TextureInfo(fileName, mimeType, (int)projectedBbox.Width, (int)projectedBbox.Height, zoomLevel,
projectedBbox));
}
public byte[] GenerateTile(int x, int y, int zoom)
{
byte[] tileBytes = null;
var font = SixLabors.Fonts.SystemFonts.CreateFont("Arial", 12);
var corner = TileUtils.TileXYToPixelXY(x, y);
var latLong = TileUtils.PixelXYToLatLong(corner.X, corner.Y, zoom);
var latLongOffset = TileUtils.PixelXYToLatLong(corner.X + TileSize, corner.Y + TileSize, zoom);
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.LatLongToPixelXY(DebugPoint.Latitude, DebugPoint.Longitude, zoom);
var testTile = TileUtils.PixelXYToTileXY(testPixel.X, testPixel.Y);
// Draw test pixel
if (testTile.X == x && testTile.Y == y)
{
var basex = TileUtils.TileXYToPixelXY(x, y);
var ptLoc = new PointF(testPixel.X - basex.X, 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);
}
private void DrawGraticules(IImageProcessingContext img, GraticuleLabels graticules, PointInt corner, int zoom)
{
var font = SixLabors.Fonts.SystemFonts.CreateFont("Arial", 8);
foreach (var meridian in graticules.VerticalLabels)
{
var loc = meridian.worldLocation;
var pt = TileUtils.LatLongToPixelXY(loc.Lat, loc.Long, zoom);
var xpos = pt.X - corner.X;
var start = new PointF(xpos, 0);
var end = new PointF(xpos, TileSize);
img.DrawLines(Rgba32.Gray, 1f, new PointF[] { start, end });
try
{
if (xpos < TileSize - 10)
{
img.DrawText(Math.Round(loc.Long, 2).ToString(), font, Rgba32.Black, new PointF(xpos, 50));
}
}
catch (Exception)
{
}
}
foreach (var parallel in graticules.HorizontalLabels)
{
var loc = parallel.worldLocation;
var pt = TileUtils.LatLongToPixelXY(loc.Lat, loc.Long, zoom);
var ypos = pt.Y - corner.Y;
var start = new PointF(0, ypos);
var end = new PointF(TileSize, ypos);
img.DrawLines(Rgba32.Gray, 1f, new PointF[] { start, end });
try
{
img.DrawText(Math.Round(loc.Lat, 4).ToString(), font, Rgba32.Black, new PointF(50, ypos));
}
catch (Exception)
{
}
}
}
public TextureInfo ConstructTextureWithGpxTrack(TileRange tiles, BoundingBox bbox, string fileName, TextureImageFormat mimeType, IEnumerable <GeoPoint> gpxPoints)
{
// where is the bbox in the final image ?
// get pixel in full map
int zoomLevel = tiles.First().TileInfo.Zoom;
var projectedBbox = ConvertWorldToMap(bbox, zoomLevel);
var tilesBbox = GetTilesBoundingBox(tiles);
int xOffset = (int)(tilesBbox.xMin - projectedBbox.xMin);
int yOffset = (int)(tilesBbox.yMin - projectedBbox.yMin);
//DrawDebugBmpBbox(tiles, localBbox, tilesBbox, fileName, mimeType);
int tileSize = tiles.Provider.TileSize;
var pointsOnTexture = gpxPoints.Select(pt => TileUtils.LatLongToPixelXY(pt.Latitude, pt.Longitude, zoomLevel))
.Select(pt => new PointF(pt.X - (int)projectedBbox.xMin, pt.Y - (int)projectedBbox.yMin));
#if NETFULL
ImageFormat format = mimeType == TextureImageFormat.image_jpeg ?
ImageFormat.Jpeg
: ImageFormat.Png;
using (Bitmap bmp = new Bitmap((int)projectedBbox.Width, (int)projectedBbox.Height))
{
using (Graphics g = Graphics.FromImage(bmp))
{
foreach (var tile in tiles)
{
using (MemoryStream stream = new MemoryStream(tile.Image))
{
using (Image tileImg = Image.FromStream(stream))
{
int x = (tile.TileInfo.X - tiles.Start.X) * tileSize + xOffset;
int y = (tile.TileInfo.Y - tiles.Start.Y) * tileSize + yOffset;
g.DrawImage(tileImg, x, y);
}
}
}
}
bmp.Save(fileName, format);
}
throw new NotImplementedException("GPX drawing not implemented yet in .Net Full");
#else
using (Image <Rgba32> outputImage = new Image <Rgba32>((int)projectedBbox.Width, (int)projectedBbox.Height))
{
foreach (var tile in tiles)
{
using (Image <Rgba32> tileImg = Image.Load(tile.Image))
{
int x = (tile.TileInfo.X - tiles.Start.X) * tileSize + xOffset;
int y = (tile.TileInfo.Y - tiles.Start.Y) * tileSize + yOffset;
outputImage.Mutate(o => o
.DrawImage(tileImg, new Point(x, y), 1f)
);
}
}
outputImage.Mutate(o => o
.DrawLines(new Rgba32(1, 0, 0, 1f), 5f, pointsOnTexture.ToArray())
);
// with encoder
//IImageEncoder encoder = ConvertFormat(mimeType);
//outputImage.Save(fileName, encoder);
outputImage.Save(fileName);
}
#endif
return(new TextureInfo(fileName, mimeType, (int)projectedBbox.Width, (int)projectedBbox.Height, zoomLevel, projectedBbox));
//return new TextureInfo(fileName, format, (int)tilesBbox.Width, (int)tilesBbox.Height);
}