"wansch" <wan***@discussions.microsoft.com> wrote in message
news:6BD1D08E-F28B-4039-8A45-F3F1E2CD89A3@microsoft.com...
> Hello,
> I try to write a small controll, where you can move around other controls
on
> a panel with the mouse. The controls can be connected by lines wich are
drawn
> on the panel surface. I have solved this with overriding MouseDown and
> MouseMove events of the panel.
> So drawing is done during the MouseMove event, when there about 10
controls
> connected by lines on the panel, the performance is very bad. I tried
> different invalidation concepts but none realy was good. When I invalidate
> the hole panel (region) all lines are redrawn, wich is ok when there are
many
> lines. But moving a single control and line, this concept is bad. When I
> invalidate only those line areas wich move the performance is ok when I
move
> one control and line, but it suffers performance when I move many lines.
> My question is?
> Is it good idea to solve moving graphics at runtime with gdi+ or is it
> better to use Direct3D. Or is there a common pattern to solve such
problems?
>
> Thanks for help.

"Bob Powell [MVP]" wrote:

> If you're using actual Control based objects for the movable items on your
> drawing canvas I suggest that you start over and create a simple retained
> mode graphics system that draws objects directly to the screen without
> messing about with a plethora of controls.
>
> The GDI+ FAQ has an article on retained mode graphics systems and there are
> other commercial systems available too that you might wish to try such as
> VG.NET.
>
> --
> Bob Powell [MVP]
> Visual C#, System.Drawing
>
> Find great Windows Forms articles in Windows Forms Tips and Tricks
> http://www.bobpowell.net/tipstricks.htm
>
> Answer those GDI+ questions with the GDI+ FAQ
> http://www.bobpowell.net/faqmain.htm
>
> All new articles provide code in C# and VB.NET.
> Subscribe to the RSS feeds provided and never miss a new article.
>
>
>
>
>
> "wansch" <wan***@discussions.microsoft.com> wrote in message
> news:6BD1D08E-F28B-4039-8A45-F3F1E2CD89A3@microsoft.com...
> > Hello,
> > I try to write a small controll, where you can move around other controls
> on
> > a panel with the mouse. The controls can be connected by lines wich are
> drawn
> > on the panel surface. I have solved this with overriding MouseDown and
> > MouseMove events of the panel.
> > So drawing is done during the MouseMove event, when there about 10
> controls
> > connected by lines on the panel, the performance is very bad. I tried
> > different invalidation concepts but none realy was good. When I invalidate
> > the hole panel (region) all lines are redrawn, wich is ok when there are
> many
> > lines. But moving a single control and line, this concept is bad. When I
> > invalidate only those line areas wich move the performance is ok when I
> move
> > one control and line, but it suffers performance when I move many lines.
> > My question is?
> > Is it good idea to solve moving graphics at runtime with gdi+ or is it
> > better to use Direct3D. Or is there a common pattern to solve such
> problems?
> >
> > Thanks for help.
>
>
>