/// <summary>
/// нарисовать подложку - просто закрасить кистью или заблурить (BlurFactor > 0)
/// </summary>
private void DrawPopupArea(Graphics g, ChartPopup popup)
{
if (popup.BlurFactor == 0)
{
g.FillRectangle(popup.BrushArea, popup.Left, popup.Top + ChartPopup.captionWidth, popup.Width, popup.Height);
}
else
{
using (var img = BitmapProcessor.CaptureControl(Chart, g))
using (var blured = BitmapProcessor.GetBluredImage(img,
new Rectangle(popup.Left, popup.Top + ChartPopup.captionWidth, popup.Width, popup.Height), popup.BlurFactor))
g.DrawImage(blured, popup.Left, popup.Top + ChartPopup.captionWidth);
}
}