Cls

[Fazi]

Hai

I have 3 picture controls in a form

i have used a timer with interval set to 1 to CLS those images.

Will this constant cls (refresh) make any perforamnce Problems?

But in my pc (2600+ sampron) process and memory are nomal. no problem at all.

[HanneSThEGreaT]

So you are refreshing the pictures every millisecond, Fazi ¿

[HanneSThEGreaT]

If that's the case I'd say it will depend on the whole complexity of the pictures you are clearing, if it's going to cause perfomance issues.

[Fazi]

Hai hanne !

Yes, i do

picture1.cls 
picture2.cls
picture3.cls

Yes. every millisecons.
i have no idea to explain the complexcity of the pictures. but the pictures got 3 smal graphics.

[jeroen79]

Why do you want to do this?

[HanneSThEGreaT]

OK, if the the pictureboxes contain only small graphics, it shouldn't be something to worry about (IMHO).
What I'd suggest you do is to test this particular issue.
Run the program, and let the Timer clear those boxes (the whole time ) - so basically keep the program running for (let's say) a minute, even 2 minutes. If you haven't seen a loss in performance, you should be fine. If you see that the clearing of the pictures become a bit slower, or even the program "works" slower, you'll have a problem

At least, that's what I would do

[litlewiki]

If you refresh the pics very millisecond .It would appear as blank anyway.So whats the point in doing so??

[Fazi]

Why do you want to do this?

Hai jeroen
the pictures need to react to every mouse move event i.e. pixel by pixel

Thats y

[Fazi]

If you refresh the pics very millisecond .It would appear as blank anyway.So whats the point in doing so??

Please check my last post (before this one) Litlewiki.
No. the pictures are fine. but if i increase the interval it is over painted by another graphic (the background graphic which is one of 3 pictures).

[Fazi]

OK, if the the pictureboxes contain only small graphics, it shouldn't be something to worry about (IMHO).
What I'd suggest you do is to test this particular issue.
Run the program, and let the Timer clear those boxes (the whole time ) - so basically keep the program running for (let's say) a minute, even 2 minutes. If you haven't seen a loss in performance, you should be fine. If you see that the clearing of the pictures become a bit slower, or even the program "works" slower, you'll have a problem

At least, that's what I would do

Hai Hanne...
Thank you for your effort to solve my issue.

The main thing considering the interval is the pictures need to react to every mouse move event i.e. pixel by pixel. so it need to be constantly clear on each move

But i check with my AMD smpron 2600+ and in a PIII 866. Process and memory consumption is at very low. i mean no cpu usage is for the program. no problem it seems

May i continue....

[HanneSThEGreaT]

May i continue....

Yes, seeing the fact that you've tested it on different pcs, and are happy with the results, continue

Good luck with the rest of your project

[Fazi]

Thank you every body....

[Jacob Roman]

The Cls function unfortunately is very slow, but then again, so are timers. Timers are not only slow, but are also inaccurate, inconsistant, and get worse the more timers you run; mainly cause every one of those timers must fire off one at a time before the next one can fire. A solution to this would be to use a managed Do Loop or While Wend loop locked at a certain refresh rate, like 60 frames per second. I have the code to do this in my signature.

When it comes to games and graphics, you shouldn't have to worry about cpu usage at all. Any commercial game will be using 100% of the CPU.

[Fazi]

Hai jacob

Thank you for the usuful tips. i picked up 'Time Based Movment' & 'Managed Game Loo ' form you signature.

[jeroen79]

Rather than a timer you may consider using the pictureboxes' or the form's mousemove events.

[Fazi]

Rather than a timer you may consider using the pictureboxes' or the form's mousemove events.

Hai jeroen
i have to track the screen mouse move events . not form mouse move .

[CVMichael]

My question is: Do you have to clear the picture boxes ?

Because first of all, it flickers a lot when you do that. (at least from my experience)

In situations like this, I usually just draw on top of it, and override the previous picture/drawing...

If you have some lines (background mostly blank), instead of cls, you could draw again exactly the same lines (or whatever), but change the color to be the same as the picture's background, this will erase the drawing, and make it look like it's cleared, except it's faster, and without the flickering.
If you are thinking that drawing exactly on top is slower because you have to re-calculate the positions, well, when you calculate the first time (when drawing the lines) you can put the positions into an array, and when you want to clear it, you can get the values that you have stored, and draw again with backgound color