static unsafe UIImage DrawCells(int nfc, int cellSize, float[] data)
{
var width = cellSize * nfc;
var height = cellSize * nfc;
UIGraphics.BeginImageContext(new CoreGraphics.CGSize(width, height));
var maxi = Array.IndexOf(data, data.Max());
for (var i = 0; i < nfc; i++)
{
var v = Math.Clamp(data[i], -1f, 1f);
var r = v < 0 ? 255 : 0;
var g = v >= 0 ? 255 : 0;
UIColor.FromRGBA(r, g, 0, (byte)(255 * Math.Abs(v))).SetColor();
UIGraphics.RectFill(new CoreGraphics.CGRect(i * cellSize, 0, cellSize, cellSize));
if (i == maxi)
{
i.ToString().DrawString(new CoreGraphics.CGPoint(i * cellSize, cellSize), UIFont.SystemFontOfSize(cellSize));
}
UIColor.FromWhiteAlpha(1.0f, 0.5f).SetColor();
UIGraphics.RectFrame(new CoreGraphics.CGRect(i * cellSize, 0, cellSize, cellSize));
}
var image = UIGraphics.GetImageFromCurrentImageContext();
UIGraphics.EndImageContext();
return(image);
}