public void MBCreateImage()
{
int imageWidth = 100;
int imageHeight = 100;
Bitmap bmp = new Bitmap(imageWidth, imageHeight);
double cx = 0;
double cy = 0;
double x_step = (_request.max_x - _request.min_x) / imageWidth;
double y_step = (_request.max_y - _request.min_y) / imageHeight;
double escapeCount = 0;
double logMax = Math.Log(1000 * _request.depth);
Console.WriteLine($"Thread: {Task.CurrentId.ToString()} started building image for connection {_request.connectionId}, {_request.display_x}, {_request.display_y}");
//run through each pixel in the bitmap, and calculate whether each pixel is in the mandelbrot set or not
//based on the co-ordinates of the request.
for (int x = 0; x <= imageWidth - 1; x++)
{
cx = _request.min_x + x * x_step;
for (int y = 0; y <= imageHeight - 1; y++)
{
cy = _request.min_y + y * y_step;
// calcuate the number of iterations to escape at this point in the set.
escapeCount = EscapeCount(cx, cy, _request.depth);
if (escapeCount < (1000 * _request.depth))
{
// use a log scale to get some nice grading in the colours
escapeCount = (Math.Log(escapeCount) / logMax);
// get a nice colour from looking up the hue of the escape count.
// note the test for zero puts a border around the image
ColorRGB colorRGB;
ColorRGB colourRGB;
if (x == 0 | y == 0)
{
colorRGB = HSL2RGB(escapeCount, 0.5, 0.55);
}
else
{
colorRGB = HSL2RGB(escapeCount, 0.5, 0.5);
}
// switch the colours around to make it a bit more interesting.
switch (_request.depth % 4)
{
case 0:
{ colourRGB.R = colorRGB.G; colourRGB.G = colorRGB.R; colourRGB.B = colorRGB.B; break; }
case 1:
{ colourRGB.R = colorRGB.B; colourRGB.G = colorRGB.G; colourRGB.B = colorRGB.R; break; }
case 2:
{ colourRGB.R = colorRGB.R; colourRGB.G = colorRGB.B; colourRGB.B = colorRGB.G; break; }
default:
{ colourRGB.R = colorRGB.R; colourRGB.G = colorRGB.G; colourRGB.B = colorRGB.B; break; }
}
// set the pixel colour
bmp.SetPixel(x, y, Color.FromArgb(colourRGB.R, colourRGB.B, colourRGB.G));
}
else
{
if (x == 0 | y == 0)
{
// set it to grey.
bmp.SetPixel(x, y, Color.FromArgb(25, 25, 25));
}
else
{
// set it to black.
bmp.SetPixel(x, y, Color.FromArgb(0, 0, 0));
}
}
}
}
// assuming everything kafka and mongo is threadsafe....
if (toFile)
{
// create a new file and write the image to the file in jpeg format.
// get rid of this when the upload to Mongo works!
string filename = $"./Images/Image{_request.display_x.ToString()}-{_request.display_y.ToString()}.jpg";
FileStream fileStream = File.Create(filename);
bmp.Save(fileStream, System.Drawing.Imaging.ImageFormat.Jpeg);
fileStream.Close();
}
else
{
// upload the bmp to mongoDB as a Jpeg
MemoryStream tmpStream = new MemoryStream();
bmp.Save(tmpStream, System.Drawing.Imaging.ImageFormat.Jpeg);
tmpStream.Position = 0;
var id = _bucket.UploadFromStream("filename", tmpStream);
bmp.Dispose();
var _response = new imageResponse();
_response.display_x = _request.display_x;
_response.display_y = _request.display_y;
_response.url = id.ToString();
_response.connectionId = _request.connectionId;
// send the image Id back to the client
_producer.ProduceAsync("imageResponse", new Message <Null, imageResponse> {
Value = _response
});
_producer.Flush();
}
Console.WriteLine($"Thread: {Task.CurrentId.ToString()} finished building image for connection {_request.connectionId}, {_request.display_x}, {_request.display_y}");
}
public imageResponse post(imageRequest req)
{
imageResponse result = _repositery.getRandom(req);
return(result);
}