All,
I have a UI form calling a class object that contains a timer that
routinely draws intensive information to the screen (~30 fps). The
drawing is invoked on the main UI thread. I need the user to be able
to interact with the UI while the drawing is happening (dynamically
change drawing properties). Since the drawing is happening on the main
UI thread, the UI form doesn't receive the user control events
consistently (if at all).
Does anyone have some suggestions on how to model this scenario so that
I can receive events on the UI form but continue to draw? How would I
tackle this in C#? Thanks.
Sep 26 '06
13  1604 
Hi Jordan,
Unless you're using the System.Windows. Forms.Timer or explicitly marshaling the timer calls to the UI thread, your drawing code is
probably executing on a thread other than the UI thread.
I only mention this because you never said which type of Timer you're using and you seemed to imply that breaking up the drawing
function into multiple methods has helped, which leads me to believe that you're executing that code on a different thread to begin
with. This is contrary to your statement, "the architecture of our system forces all drawing to be invoked on the UI thread".
HTH
--
Dave Sexton
"Jordan" <jo***********@ gmail.comwrote in message news:11******** **************@ h48g2000cwc.goo glegroups.com.. .
All,
I have a UI form calling a class object that contains a timer that
routinely draws intensive information to the screen (~30 fps). The
drawing is invoked on the main UI thread. I need the user to be able
to interact with the UI while the drawing is happening (dynamically
change drawing properties). Since the drawing is happening on the main
UI thread, the UI form doesn't receive the user control events
consistently (if at all).
Does anyone have some suggestions on how to model this scenario so that
I can receive events on the UI form but continue to draw? How would I
tackle this in C#? Thanks.
Dave,
No, it is drawing in the main UI thread. Here is what happens:
1) Class uses server timer (System.Timers. Timer)
2) Timer elapsed - call to RedrawViewers
3) Internally, RedrawViewers invokes to the main UI thread
4) Main UI thread handles OnAfterDraw event and paints to screen
What I did was make the painting more efficient and lower the FPS timer
rate (if I jump to 60 fps, it gets messy again).
Dave Sexton wrote:
Hi Jordan,
Unless you're using the System.Windows. Forms.Timer or explicitly marshaling the timer calls to the UI thread, your drawing code is
probably executing on a thread other than the UI thread.
I only mention this because you never said which type of Timer you're using and you seemed to imply that breaking up the drawing
function into multiple methods has helped, which leads me to believe that you're executing that code on a different thread to begin
with. This is contrary to your statement, "the architecture of our system forces all drawing to be invoked on the UI thread".
HTH
--
Dave Sexton
"Jordan" <jo***********@ gmail.comwrote in message news:11******** **************@ h48g2000cwc.goo glegroups.com.. .
All,
I have a UI form calling a class object that contains a timer that
routinely draws intensive information to the screen (~30 fps). The
drawing is invoked on the main UI thread. I need the user to be able
to interact with the UI while the drawing is happening (dynamically
change drawing properties). Since the drawing is happening on the main
UI thread, the UI form doesn't receive the user control events
consistently (if at all).
Does anyone have some suggestions on how to model this scenario so that
I can receive events on the UI form but continue to draw? How would I
tackle this in C#? Thanks.
Hi Jordan,
Sorry I doubted you!
It all sounds good to me.
--
Dave Sexton
"Jordan" <jo***********@ gmail.comwrote in message news:11******** **************@ b28g2000cwb.goo glegroups.com.. .
Dave,
No, it is drawing in the main UI thread. Here is what happens:
1) Class uses server timer (System.Timers. Timer)
2) Timer elapsed - call to RedrawViewers
3) Internally, RedrawViewers invokes to the main UI thread
4) Main UI thread handles OnAfterDraw event and paints to screen
What I did was make the painting more efficient and lower the FPS timer
rate (if I jump to 60 fps, it gets messy again).
Dave Sexton wrote:
>Hi Jordan,
Unless you're using the System.Windows. Forms.Timer or explicitly marshaling the timer calls to the UI thread, your drawing code
is
probably executing on a thread other than the UI thread.
I only mention this because you never said which type of Timer you're using and you seemed to imply that breaking up the drawing
function into multiple methods has helped, which leads me to believe that you're executing that code on a different thread to
begin
with. This is contrary to your statement, "the architecture of our system forces all drawing to be invoked on the UI thread".
HTH
--
Dave Sexton
"Jordan" <jo***********@ gmail.comwrote in message news:11******** **************@ h48g2000cwc.goo glegroups.com.. .
All,
I have a UI form calling a class object that contains a timer that
routinely draws intensive information to the screen (~30 fps). The
drawing is invoked on the main UI thread. I need the user to be able
to interact with the UI while the drawing is happening (dynamically
change drawing properties). Since the drawing is happening on the main
UI thread, the UI form doesn't receive the user control events
consistently (if at all).
Does anyone have some suggestions on how to model this scenario so that
I can receive events on the UI form but continue to draw? How would I
tackle this in C#? Thanks.
No problems - thanks for the help.
Dave Sexton wrote:
Hi Jordan,
Sorry I doubted you!
It all sounds good to me.
--
Dave Sexton
"Jordan" <jo***********@ gmail.comwrote in message news:11******** **************@ b28g2000cwb.goo glegroups.com.. .
Dave,
No, it is drawing in the main UI thread. Here is what happens:
1) Class uses server timer (System.Timers. Timer)
2) Timer elapsed - call to RedrawViewers
3) Internally, RedrawViewers invokes to the main UI thread
4) Main UI thread handles OnAfterDraw event and paints to screen
What I did was make the painting more efficient and lower the FPS timer
rate (if I jump to 60 fps, it gets messy again).
Dave Sexton wrote:
Hi Jordan,
Unless you're using the System.Windows. Forms.Timer or explicitly marshaling the timer calls to the UI thread, your drawing code
is
probably executing on a thread other than the UI thread.
I only mention this because you never said which type of Timer you're using and you seemed to imply that breaking up the drawing
function into multiple methods has helped, which leads me to believe that you're executing that code on a different thread to
begin
with. This is contrary to your statement, "the architecture of our system forces all drawing to be invoked on the UI thread".
HTH
--
Dave Sexton
"Jordan" <jo***********@ gmail.comwrote in message news:11******** **************@ h48g2000cwc.goo glegroups.com.. .
All,
I have a UI form calling a class object that contains a timer that
routinely draws intensive information to the screen (~30 fps). The
drawing is invoked on the main UI thread. I need the user to be able
to interact with the UI while the drawing is happening (dynamically
change drawing properties). Since the drawing is happening on the main
UI thread, the UI form doesn't receive the user control events
consistently (if at all).
Does anyone have some suggestions on how to model this scenario so that
I can receive events on the UI form but continue to draw? How would I
tackle this in C#? Thanks.
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