private void HandleTileResponse(IAsyncResult result)
{
TileRequestState state = result.AsyncState as TileRequestState;
using (var response = state.request.EndGetResponse(result) as HttpWebResponse)
{
lock (canvasLock)
{
using (var image = Image.FromStream(response.GetResponseStream()))
{
state.canvas.DrawImage(image, state.dst, state.src, GraphicsUnit.Pixel);
state.canvas.Save();
mapView.SetPropertyThreadSafe("Image", bitmap);
mapView.Invalidate();
}
planningLabel.SetPropertyThreadSafe("Text", $"Loading {numTilesLeft} tiles . . .");
if (--numTilesLeft <= 0)
{
state.canvas.Dispose();
planningLabel.SetPropertyThreadSafe("Visible", false);
editButton.SetPropertyThreadSafe("Enabled", true);
}
}
}
}
private void LoadTiles()
{
// Only load the tiles encapsulating the map coordinates.
double numTilesAcross = Math.Pow(2, TileZoom);
int tileX0 = (int)Math.Floor(mapX0 * numTilesAcross);
int tileY0 = (int)Math.Floor(mapY0 * numTilesAcross);
int tileX1 = (int)Math.Floor(mapX1 * numTilesAcross);
int tileY1 = (int)Math.Floor(mapY1 * numTilesAcross);
int widthInTiles = (tileX1 - tileX0 + 1);
int heightInTiles = (tileY1 - tileY0 + 1);
numTilesLeft = widthInTiles * heightInTiles;
int mapPixelWidth = (int)((mapX1 - mapX0) * numTilesAcross * TileWidth);
int mapPixelHeight = (int)((mapY1 - mapY0) * numTilesAcross * TileWidth);
int imageWidth = Math.Max(mapPixelWidth, mapPixelHeight);
planningLabel.SetPropertyThreadSafe("Text", $"Loading {numTilesLeft} tiles for {mapName} . . .");
bitmap = new Bitmap(mapPixelWidth, mapPixelHeight);
var canvas = Graphics.FromImage(bitmap);
int dstX0 = 0;
int dstY0 = 0;
int dstX1 = 0;
int dstY1 = 0;
for (int j = tileY0; j <= tileY1; ++j)
{
dstX0 = 0;
for (int i = tileX0; i <= tileX1; ++i)
{
HttpWebRequest req = (HttpWebRequest)WebRequest.Create($"https://tiles.guildwars2.com/1/1/{TileZoom}/{i}/{j}.jpg");
int srcX0 = (int)Math.Max(0, numTilesAcross * TileWidth * mapX0 - i * TileWidth);
int srcY0 = (int)Math.Max(0, numTilesAcross * TileWidth * mapY0 - j * TileWidth);
int srcX1 = (int)Math.Min(TileWidth, numTilesAcross * TileWidth * mapX1 - i * TileWidth);
int srcY1 = (int)Math.Min(TileWidth, numTilesAcross * TileWidth * mapY1 - j * TileWidth);
int srcWidth = srcX1 - srcX0;
int srcHeight = srcY1 - srcY0;
int dstWidth = srcWidth;
int dstHeight = srcHeight;
dstX1 = dstX0 + dstWidth;
dstY1 = dstY0 + dstHeight;
var state = new TileRequestState()
{
request = req,
canvas = canvas,
src = new Rectangle(srcX0, srcY0, srcWidth, srcHeight),
dst = new Rectangle(dstX0, dstY0, dstWidth, dstHeight)
};
req.BeginGetResponse(HandleTileResponse, state);
dstX0 = dstX1;
}
dstY0 = dstY1;
}
}