On Thursday, May 10, 2012 6:40:11 PM UTC+2, Russell Ryan wrote:
> On May 10, 12:35 pm, Russell Ryan <rr...@stsci.edu> wrote:
>> On May 10, 10:24 am, Helder <hel...@marchetto.de> wrote:
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>> Hi,
>>> I would like to have a base widget with a draw widget where I play a movie (as in displaying a series of images from a stack).
>>> I would like to have the typical two buttons that start the play of the movie and the pause button.
>>> I'm not that good with widgets, but I can't thick of how I would be able to interrupt a loop that displays the images.
>>> I would have had something like:
>>
>>> PauseButtonPressed = 0
>>> ImgNr = 0
>>> LoopInterval = 0.2
>>> WHILE ~PauseButtonPressed THEN
>>> TV, Image[ImgNr,*,*]
>>> ImgNr++
>>> IF ImgNr GT nImages THEN ImgNr = 0
>>> WAIT, LoopInterval
>>> ENDWHILE
>>
>>> Is there a way to check if the user has clicked something in the loop?
>>
>>> Thanks,
>>> Helder
>>
>> Hi Helder
>> Yeah, there is a way to do this....
>> Here's a little example:
>>
>> pro timer_event,event
>> widget_control,event.id,get_uval=uval
>>
>> case uval of
>> 'START': begin
>> widget_control,event.top,get_uval=state
>> (*state).stop=0b
>> widget_control,(*state).wtime,timer=(*state).time
>> end
>> 'RESTART': begin
>> widget_control,event.top,get_uval=state
>> (*state).iter=0L
>> (*state).stop=0b
>> widget_control,(*state).wtime,timer=(*state).time
>> end
>> 'STOP': begin
>> widget_control,event.top,get_uval=state
>> (*state).stop=1b
>> end
>> 'TIME': begin
>> widget_control,event.top,get_uval=state
>>
>> ;your movie stuff here:
>> n=50
>> x=findgen(n)/(n-1)*2*!PI
>> x+=(*state).iter*2*!PI/10.
>> plot,x,sin(x)
>> ;end of movie stuff
>>
>> ;more to end the loop
>> if (*state).stop then return
>> if ++(*state).iter gt (*state).maxiter then return
>> widget_control,event.id,timer=(*state).time
>> end
>>
>> 'DRAW':
>> else:
>> endcase
>> end
>>
>> pro timer
>>
>> base=widget_base(/col)
>> wtime=widget_base(base,uval='TIME')
>> wdraw=widget_draw(base,xsize=200,ysize=200,uval='DRAW')
>> wstart=widget_button(base,value='Start',uval='START')
>> wrestart=widget_button(base,value='Restart',uval='RESTART')
>> wstop=widget_button(base,value='Stop',uval='STOP')
>>
>> state={wdraw:wdraw,$
>> wtime:wtime,$
>> wstart:wstart,$
>> wstop:wstop,$
>> time:0.1,$
>> stop:0b,$
>> maxiter:100l,$
>> iter:0l}
>> state=ptr_new(state,/no_copy)
>> widget_control,base,/realize,set_uval=state
>> xmanager,'timer',base,/no_block
>>
>> end
>
> I should have said, the speed of the animation is set by time (which
> is in seconds). I set it to 0.1 by default (see the state
> structure). The looping variable is iter and the maximum size (which
> you don't necessarily need) is set by maxiter. You could change this
> to be max runtime and keep track of the length of time the animation
> has run, but that might get you in to trouble (like if the CPU slows
> down because you're doing something else). But the magic is in the
> widget_timer. My organization of the event_handler is probably not
> ideal, but it is just a get-you-started example.
>
> Good Luck,
> Russell
Dear Russell,
that's great and works just fine for me. I wasn't aware of the keyword uvalue for widgets (well actually I was aware, but I just didn't know what the this was for!).
I see that this can be set just to manage such loops.
Again, thanks a lot for your help. Really appreciated.
Cheers, Helder
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