Thinking out loud here. Could you take an off-screen snapshot of the formatted list and then just scroll the image at whatever speed you want?
Bill Vlahos _________________ InfoWallet (http://www.infowallet.com) is about keeping your important life information with you, accessible, and secure. On May 18, 2011, at 8:52 AM, Jim Schaubeck wrote: > Thank you Chris!! > I agree that currently, any other action within the computer would translate > to a 'stutter' or 'flicker' on the ticker tape. In my app there will be a > polling script to grab fresh data from an external db about every 5 or 10 > minutes. During the database poll, I would take the ticker stream off of > the screen so I'm not worried about any extra processing that I ask the > computer to do. > > You are describing all of my problems perfectly but, at least to me, the app > is far too appealing to stop trying. From a coding perspective, LiveCode is > all I know :-) > > Every Walmart, doctor's office, Home Depot, restaurant, etc I go into I look > at the Digital Signage and say, "I can do that!" > > Does anyone see a fit for animation Engine? Will it assist in making these > types of motion consistent or 'smooth'?? > > jim schaubeck > 714-321-4499 > > > -----Original Message----- > From: use-livecode-boun...@lists.runrev.com > [mailto:use-livecode-boun...@lists.runrev.com] On Behalf Of Nonsanity > Sent: Wednesday, May 18, 2011 7:33 AM > To: How to use LiveCode > Subject: Re: Livecode for Digital Signage > > I see your problem then. In my sample stack, the text display area is 800 > pixels wide. Going by the speed you set it to, that means the text is moving > 1 pixel every 4 milliseconds. No WONDER you're getting jerky motion. > > With the 300 speed setting change you made, I could make it smooth by > setting the send in time delay to 10-15 milliseconds. But with the script > (simple as it is) executing that often, it is VERY susceptible to upset from > any other task running on that computer. Any delay elsewhere inside the > computer results in a visible stutter as it misses a few updates. > > Also at that speed, there's an increased chance of intersecting the screen > refresh rate, which results in a momentary sheering effect along the text. > The sheer and the stutter combine to keep the text from looking solid when > moving that fast. > > Tickers as seen on TV are sync-locked to the video stream, I believe, which > makes them far more stable. They are also usually on dedicated hardware and > not a home desktop computer that's running who-knows-what in the background. > > I don't think you're going to be able to get that fast a speed without > temporal artifacting in LiveCode. Can you slow it down? > > But even at one third that speed, you will still see the occasional sheer > (far less frequently) and some stuttering (other tasks are still running, > after all) though that is less noticeable because less distance is being > skipped at that speed.. > > the only way I can think of to get a sure-fire smooth scroll at ANY speed > would be to offload the work to a graphics card. Then the updates would be > synced to the display's refresh rate (no sheer) and no other tasks are > running on the graphics card CPU (so no stutter). But you can't do that in > LiveCode currently. (OpenGL support on the roadmap, anyone?) > > ~ Chris Innanen > ~ Nonsanity > > > > On Wed, May 18, 2011 at 1:17 AM, Jim Schaubeck > <jimschaub...@yahoo.com>wrote: > >> Chris, >> Thank you for sending your sample !!! >> >> I worked with your code a bit and changed this line: >> put dTime / 300 into pTime-- changed to 300 >> >> This made the test move a similar speed (faster than your speed) to a >> stock ticker tape but I still have the jerkiness. >> >> I will save your project for future reference though, thanks again! >> >> jim schaubeck >> 714-321-4499 >> >> >> -----Original Message----- >> From: use-livecode-boun...@lists.runrev.com >> [mailto:use-livecode-boun...@lists.runrev.com] On Behalf Of Nonsanity >> Sent: Tuesday, May 17, 2011 10:05 PM >> To: How to use LiveCode >> Subject: Re: Livecode for Digital Signage >> >> Using hscroll of a field and the send in time command, I got very >> smooth text scroll on my Macbook Pro. Here's the stack I tested with: >> >> >> > https://dl.dropbox.com/s/l4gc4mp0401j6se/Smooth%20Scrolling%20Text.livecode? >> dl=1<https://dl.dropbox.com/s/l4gc4mp0401j6se/Smooth%20Scrolling%20Tex >> t.livecode?%0Adl=1> >> >> Let me know how it works for you. >> >> ~ Chris Innanen >> ~ Nonsanity >> >> >> >> On Tue, May 17, 2011 at 10:28 PM, Jim Schaubeck >> <jimschaub...@yahoo.com>wrote: >> >>> I would like to develop an in-house digital signage app that uses >>> video, animation and smooth scrolling words (like a stock ticker). >>> I can figure out the video and the animation but I'm having trouble >>> with smooth scrolling text. Is this better suited for Animation >>> Engine (have not tried it) or is there a trick to getting text to >>> flow Right-to-Left smoothly. The best that I can see is the move >>> command but it's still too jerky for displaying in a store. >>> >>> >>> >>> Thank you for any feedback >>> >>> >>> >>> jim schaubeck >>> >>> 714-321-4499 >>> >>> >>> >>> _______________________________________________ >>> use-livecode mailing list >>> use-livecode@lists.runrev.com >>> Please visit this url to subscribe, unsubscribe and manage your >>> subscription preferences: >>> http://lists.runrev.com/mailman/listinfo/use-livecode >>> >> _______________________________________________ >> use-livecode mailing list >> use-livecode@lists.runrev.com >> Please visit this url to subscribe, unsubscribe and manage your >> subscription >> preferences: >> http://lists.runrev.com/mailman/listinfo/use-livecode >> >> >> _______________________________________________ >> use-livecode mailing list >> use-livecode@lists.runrev.com >> Please visit this url to subscribe, unsubscribe and manage your >> subscription preferences: >> http://lists.runrev.com/mailman/listinfo/use-livecode >> > _______________________________________________ > use-livecode mailing list > use-livecode@lists.runrev.com > Please visit this url to subscribe, unsubscribe and manage your subscription > preferences: > http://lists.runrev.com/mailman/listinfo/use-livecode > > > _______________________________________________ > use-livecode mailing list > use-livecode@lists.runrev.com > Please visit this url to subscribe, unsubscribe and manage your subscription > preferences: > http://lists.runrev.com/mailman/listinfo/use-livecode _______________________________________________ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
