Thanks, Bjorne: That works. So I guess livecode is always trying to update the screen image, unless the screen is locked. But, it gets behind sometimes, so needs a little wait time.
Bill William Prothero http://es.earthednet.org On Oct 1, 2013, at 11:06 AM, Björnke von Gierke <[email protected]> wrote: > Most likely your examples are part of larger scripts. Always make sure that > you unlock the screen as often as you lock it. 'lock screen' is symetrical > additive, and not on/off switches like most other properties. So if you do > two locks, and one unlock the screen is still locked. If that is not your > problem, sometimes LC can be a bit cautious with screen refreshes, it tries > to do some optimisation by not actually showing all screen changes all the > time. > > In that case try to experiment with "wait". Personally I like this form to > force a screen refresh (again, only if lock screen is not enabled): > > wait with messages for 0 seconds > > note that 'with messages' can impede the speed of your code, and I haven't > tested if it's actually better then without. However it seemed to be the best > way to make sure (again if lock screen is not enabled somewhere) to get a > screen refresh. > > As a final note, if your script runs in a 'resizeStack' handler, never use > lock screen (again because of internal optimisation the screen is actually > already locked in an opaque way). > > On 01.10.2013, at 01:36, [email protected] wrote: > >> This seems like it should be easy, but I can't find anything in the >> documentation. >> >> I have a large map image that I want to draw onto. I have defined a >> viewport, which is a graphic rectangle and all parts of the map that are not >> within the viewport are hidden. The large map will move around, magnify, >> etc. This all works. I want to draw symbols on the visible part of the map, >> and in order to make this efficient, I take a snapshot of the part of the >> map that's in the viewport and will use that for the symbols. >> >> To do the snapshot, I first set the visible of the snapshot image to false, >> take the snapshot of the map, then set the visible of the snapshot image to >> true. >> >> Set the visible of snapShotImage to FALSE >> take snapshot -- this takes the snapshot of the snapsShotImage >> Set the visible of the snapShotImage to TRUE --this does not refresh the >> screen. >> >> I can get it to work if I do: >> Set the visible of snapShotImage to FALSE >> take snapshot -- this works >> wait 0.2 seconds >> Set the visible of the snapShotImage to TRUE --this does refresh the screen >> >> Is this the best way to force a screen refresh??? >> >> Bill >> >> William Prothero >> http://es.earthednet.org >> >> >> >> >> _______________________________________________ >> use-livecode mailing list >> [email protected] >> Please visit this url to subscribe, unsubscribe and manage your subscription >> preferences: >> http://lists.runrev.com/mailman/listinfo/use-livecode > > > -- > > Use an alternative Dictionary viewer: > http://bjoernke.com/bvgdocu/ > > Chat with other RunRev developers: > http://bjoernke.com/chatrev/ > > > > _______________________________________________ > use-livecode mailing list > [email protected] > Please visit this url to subscribe, unsubscribe and manage your subscription > preferences: > http://lists.runrev.com/mailman/listinfo/use-livecode _______________________________________________ use-livecode mailing list [email protected] Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
