private void RedrawAllPolygons()
{
int width = (int)(Application.Current.MainWindow as MainWindow).ActualWidth;
int height = (int)(Application.Current.MainWindow as MainWindow).ActualHeight;
var bitmap = new Bitmap(width, height);
bitmap.Fill(Color.White);
RedrawPolygon(bitmap, firstPolygon);
firstPolygonFiller.Fill(bitmap);
RedrawPolygon(bitmap, secondPolygon);
BitmapCanvas = bitmap.ConvertToBitmapImage();
bitmap.Dispose();
RaisePropertyChanged("BitmapCanvas");
}
