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
