private RenderTargetBitmap createBitmap(BaseSymbol symbol)
{
if (symbolCache.ContainsKey(symbol))
return symbolCache[symbol];
FrameworkElement element;
switch (symbol.Type)
{
default: // ToDo: support different types
element = new Pyramid {Color = symbol.Color};
break;
}
element.Width = element.Height = symbol.Size;
element.Measure(new Size(element.Width, element.Height));
element.Arrange(new Rect(0, 0, element.Width, element.Height));
var bitmap = new RenderTargetBitmap((int)element.Width, (int)element.Height, 96, 96, PixelFormats.Pbgra32);
bitmap.Render(element);
bitmap.Freeze();
symbolCache.Add(symbol, bitmap);
return bitmap;
}