public void FillRectangle(Rectangle rect,Cairo.Context ctx,bool known,bool selected)
{
if(known)
ctx.SetSourceRGBA (0, 0,0.7, 0.3);
else
ctx.SetSourceRGBA (0.7, 0,0, 1.3);
ctx.LineWidth = selected ? 8.2 : 0.8 ;
Rectangle r = ImageCoordsToWindow (rect);
Log.Debug("Fill Rectangle"+rect.ToString()+ " >>> "+r.ToString() + " ["+XOffset +","+YOffset+"]" );
ctx.MoveTo (r.X, r.Y);
ctx.LineTo (r.X + r.Width, r.Y);
ctx.LineTo (r.X + r.Width, r.Y + r.Height);
ctx.LineTo (r.X, r.Y + r.Height);
ctx.LineTo (r.X, r.Y);
ctx.Stroke ();
}