Thanks Achim, I would not have guessed even half of that, but it all makes sense. I have implemented and tested it and it works fine :)
So the next thing is that at different times during running the application, I have other things on the screen (e.g some other text), and I want to make sure that the scrolling text doesn't go across those places. I therefore want to know the height of the text, so I can set the Y position before the text goes across. There is an output from the Image With String, which is the display height. When I first set the text, I ask for that value, and it returns 0. After the first text has scrolled across and I set the second string value, when I ask for the height, I do get a value - but by then it's too late for the first line of text. I would like to know what that height is going to be before the first text comes across. I believe there is just one other tricky bit of logic I am having problems with: I have found a few animations I want to use (it's kind of like a screensaver scenario), and I want to choose which one to play next at random, fade the one that's playing out, and fade the new one in. I have found a Random patch, and a Fade patch. Basically I think I would need something that ran a timer for the duration I want an animation shown, and when that finishes, it would trigger another timer that would feed into a fade, and once that timer was finished, it would somehow get a random number generator to choose which animation to show next, and it would enable that animation and set a fade in timer etc. If I can get that one solved, I think I probably have all the bits to achieve my objective. Regards Gideon On 11/07/2012, at 2:05 AM, Achim Breidenbach <ac...@boinx.com> wrote: > Hello Gideon, > > regarding your first problem of restarting your animation: I would use a Stop > Watch patch and use its time output to be put in the Time input of your > Interpolation Patch, but for this you have to set the timebase of your > Interpolation Patch to "External". Then I would observe the incoming text > value with a "Watcher" patch and restart the stop watch once the text > changes. (put the output from the watcher to "Reset" and "Stop" and via a > Logic patch set to "NOT" to the Start input. I hope this works for you. > > I am not sure if I understand the second issue completely. Maybe you can > describe this in more detail? > > best, > > Achim Breidenbach > Boinx Software > > > On 10.07.2012, at 17:14, Gideon King wrote: > >> Hi, I'm just starting to explore QC, and am trying to put together something >> that will scroll some text across the screen, then I will later give it some >> different text and want to restart the animation to scroll that across the >> screen. >> >> To create the image of the text, I am using the "Image with string" object, >> and have published the text string input as "ScrollingLineOfText". I have >> linked the image output to a sprite to display it. >> >> To get it to move across the screen, I have an "Interpolation" object >> currently going from 2 to -2 with no repeat, and have linked that to the X >> position of the sprite. >> >> I can set the text from my program by using setValue:forInputKey:, and the >> text scrolls across the screen (yay!). >> >> Where I am running into problems is when I want to restart the animation. I >> have published the Enable property of the sprite as "ScrollingLineEnabled", >> and have set the timebase of the Interpolation to "Local", which I read is >> what you are supposed to do. When I run it in the preview and turn the >> enabled property off and on, it restarts the animation as expected. >> >> In my program, I try to turn the enabled property off and on, and change the >> text with: >> >> [qcLayer setValue:[NSNumber numberWithBool:NO] >> forInputKey:@"ScrollingLineEnabled"]; >> >> [qcLayer setValue:[scrollingText objectAtIndex:itemNumber] >> forInputKey:@"ScrollingLineOfText"]; >> >> [qcLayer setValue:[NSNumber numberWithBool:YES] >> forInputKey:@"ScrollingLineEnabled"]; >> >> But the animation doesn't get restarted. Can anyone shed any light on this? >> Is there some configuration option I am missing? >> >> Also, I want to be able to set the Y position of the text depending on what >> else is on the screen at the time and the height of the text, so I have >> published the height of the text image as "ScrollingTextHeight", but when I >> have set the first text and ask for that value, it returns 0. Then when I >> come through again and change the text, by then there is a value there >> (presumably as a proportion of the height of the view). How can I get it to >> work out the height of the image at the start, as soon as I have set the >> string? >> >> >> Regards >> >> Gideon >> >> >> >> >> >> >> >> >> >> _______________________________________________ >> Do not post admin requests to the list. They will be ignored. >> Quartzcomposer-dev mailing list (Quartzcomposer-dev@lists.apple.com) >> Help/Unsubscribe/Update your Subscription: >> https://lists.apple.com/mailman/options/quartzcomposer-dev/achim%40boinx.com >> >> This email sent to ac...@boinx.com > _______________________________________________ Do not post admin requests to the list. They will be ignored. Quartzcomposer-dev mailing list (Quartzcomposer-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/quartzcomposer-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
