public async Task<SquareShape> GetSquareInfoAsync (SquareShape input)
{
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create (new Uri (WebServiceAPI + "patterns/random"));
request.ContentType = "application/json";
request.Method = "GET";
using (WebResponse response = await request.GetResponseAsync ()) {
using (StreamReader reader = new StreamReader (response.GetResponseStream ())) {
try {
var content = reader.ReadToEnd ();
if (string.IsNullOrWhiteSpace (content)) {
return input;
} else {
var doc = XDocument.Parse (content);
return doc.Root.Descendants ("pattern")
.Select (x => new SquareShape () {
Id = input.Id,
ImagePath = x.Element ("imageUrl").Value,
Center_X = input.Center_X,
Center_Y = input.Center_Y,
Radius = input.Radius
}).FirstOrDefault () ?? input;
}
} catch {
return input;
}
}
}
}
public async Task<SquareShape> PutImageToCache (SquareShape squareShape)
{
SquareShape shapeInfo = null;
if (string.IsNullOrEmpty (squareShape.ImagePath)) {
shapeInfo = await _webServices.GetSquareInfoAsync (squareShape);
}
if (shapeInfo != null) {
var bitmap = await GetImageBitmapFromUrl (shapeInfo.ImagePath);
if (bitmap != null)
_imageCache.Put (shapeInfo.Id.ToString (), bitmap);
return shapeInfo;
} else {
return squareShape;
}
}
async Task PreloadSquareShapes ()
{
if (_squareShapes == null) {
_squareShapes = new Queue<SquareShape> (_imageService.ImageQueueCount);
}
while (_squareShapes.Count < _imageService.ImageQueueCount) {
_shapeID++;
var shape = new SquareShape (){ Id = _shapeID};
shape.Center_X = _randomSeed.Next (10, _maxWidth);
shape.Center_Y = _randomSeed.Next (10, _maxHeight);
shape.Radius = _randomSeed.Next (10, (_maxWidth + _maxHeight) / 8);
var shapeInfo = await _imageService.PutImageToCache (shape);
_squareShapes.Enqueue (shapeInfo);
}
}
public async Task<Bitmap> GetImageFromCache (SquareShape shape)
{
try
{
var bitmap = _imageCache.Get (shape.Id.ToString()) as Bitmap;
if (bitmap == null) {
bitmap = await GetImageBitmapFromUrl(shape.ImagePath);
}
return bitmap;
}
catch (Exception ex)
{
Debug.WriteLine (ex.ToString ());
}
return null;
}