How about:
- render your charts in an ImageSurface, eventually in a background thread,
save it in a class member
- use it to paint the background of the DrawingArea, perform any additional
drawing on top of it
something like:
static ImageSurface build_Surface(int Width, int Height, Color Color)
{
Context _context = null;
try
{
ImageSurface _surface = new ImageSurface(Format.Argb32, Width,
Height);
_context = new Context(_surface);
_context.Rectangle(0, 0, Width, Height);
_context.Color = Color;
_context.Fill();
return _surface;
}
finally
{
if (_context != null) ((IDisposable)_context).Dispose();
}
}
ImageSurface m_surface = build_Surface(512, 512, new Color(1,0,0,1));
private void onExposeEvent (object o, ExposeEventArgs args)
{
DateTime _ti = DateTime.Now;
Context _pContext = null;
try
{
_pContext = Gdk.CairoHelper.Create(this.GdkWindow);
_pContext.Rectangle(0, 0, this.Allocation.Width,
this.Allocation.Height);
_pContext.SetSource(m_surface);
_pContext.Fill();
// Any additional rendering here
}
finally
{
if (_pContext != null) ((IDisposable)_pContext).Dispose();
}
}
--
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