LiveCode Forums.

Hello everyone,

I need a script for randomly selecting a single image out of a certain number images that will be hidden on a card and display it. The script also needs to not repeat an image until all images have cycled through. This script will be on "opencard" so each time the card gets opened it'll generate a new image.

I'll have a button that will take us back to a previous card. It should also hide whatever image is displayed on the current card while it transitions back to the previous card.

Any help is appreciated.

I've gotten the script to display a random image with "any image" but it often displays the same image back to back.

Hi

Many fun ways to do this. Here is one, and it requires you to play along. If, after you do this, you still need help, write back.

On a new card make a button and two moderately sized fields. In field 1, put several very short lines of data. In the button script Do you see how this works? Do you see how you can use image references instead of whatever data you put into field 1? Step through if you need to, and watch the variables and fields.

Craig Newman

Ok, I will try this now. Thank you.

I've gotten the script to work with general text data. But when I attempted to use an image reference, I cant get the image to display. It only displays the text image path information. I believe I'm missing a piece of data to make the script display the referenced path as an image.

Hi jiqoyn,

please post your script, otherwise we will have to guess and that is ineffective


Best

Klaus

What Klaus said.

But how do you "display" an image now? All I did was give you a way to arrange data from a list. In other words, whatever one-liner that worked before ought to work as well with a single instance from the derived list.

Craig

Here is the code that I'm using, it works for just lines of text:

on mouseUp
if field 3 = ""
then put field 1 into field 3

put fld 3 into rawData
put "" into fld 2
get random (the number of lines of rawData)
put line it of rawData & return after field 2

delete line it of rawData
end mouseUp

I've tried to change it to "show" an image but it doesnt work. I've set up a card in the stack that has my images on it, and I've tried to (1) reference those images from card 1; (2) I've also tried to go to the card that has the images on it and change the code a bit to make them display randomly but without success.

It frustrates me a bit bc it seems so easy but its a bit difficult to execute.
Also, when running the script ( which it works when just displaying text entries in the field) it sometimes doesnt change whats in the field. For example:
I have 1 field that has this information - line1, line2,line3,line4 in a row going down. I have 3 fields. field 1 is hidden, the script takes whatever is in field 1 and puts it into field 3. Then the script is supposed to randomly ( without repeating one until all of the entries have been chosen) choose another line. But I'm finding that the displayed line entry stays there after pushing the button once or twice. And it goes back and forth from 1 to 2 a few times without ever randomly cycling through. I hope that makes sense. What I'd want is a script that 'without repeating one, cycles through the entire list, and once all have been cycled through, to then start back over.'

Hi.

Is this just a distilled example of your handler? There is no loop that does what you described, or that mimics the one I offered a while back. Repeated clicking will now and then get the same line from field 1 displayed in field 2. As it should, Step through and see.

Review my example handler from two weeks ago. Run the experiment I suggested. What you end up with is a randomly sorted list without repeats. From there you can do whatever you want, like display images perhaps referenced in each line of that data.

But there is still that other issue, the displaying of an image. How do you do this now by hand? Do you show one image, and I am assuming the others are hidden? Whatever, that is trivial. The lesson is in the selection of non-repeating data.

Craig

Probably you are looking for this:

########CODE#######
On openCard
#change working directory to the directory of this software
set itemDel to "/"
set the defaultFolder to item 1 to -2 of (the effective fileName of this stack)
#get the list of images already used
set the imageUsed of me to URL "file:./imageused.txt"
createImage
end openCard

on createImage
put the number of images of me into nImages
put random(nImages) into temp
if temp is not among the items of the imageUsed of me then
create image
set the imagedata of the last image to the imagedata of image temp
put temp & comma after URL "file:./imageused.txt"
else
createImage
end if
end createImage
#####END OF CODE#####

Hi Max,

I am sure now you managed to completely irritate the thread-starter.


Best

Klaus

Klaus:

LOL

MaxV:

This student needs to be handled more gently and slowly.

jiqoyn:

Please write back with your progress. Do you see what I was getting at? That once you have your new list, if each line in that list was a reference to an image, you can pluck each one out in order and display it, each time hiding all the others. That requires another short snippet of code, and that is what I want you to see and perhaps even write for yourself.

Craig

lol no! he didn't irritate me. I just saw his reply. Once I get back to my pc this afternoon I'll test the original instructions. I don't know why I omitted the repeat statement. And once I get that working, I'll just need to know how to show the referenced image. Thanks everyone for your help.

Hi jiqoyn,

okie dokie

jiqoyn wrote:...I'll just need to know how to show the referenced image.

Instead of using several images, just set up ONE image object and simply:
...
set the filename of image "the only image object" to variable_containing_the_new_path_to_image_file
...


Best

Klaus

What Klaus said.

Another way is to place all the images on a card and hide them. Then once you have your randomized list:

imageReference7
imageReference2
imageReference5
...

You can(pseudo): Of course, you may not want to do it this way at all. But if you see how this goes, you can make it the way you want it.

Craig

A summary of how I'd approach this, assuming you have 4 imported images on a card already:

make a randomized list of numbers from 1 to 4
hide all 4 images
peel off either the first or last number in the random list
show that image
delete the line from the randomized list

The reason I say "first or last number" is because it will work either way, but under the hood, using the last one in the list will be faster if the list is very long. In your case the list is very short so it doesn't matter, but I often go from the back end just out of habit.

Here's one way to do it:
There are better ways to handle this than using fields, but for now this should work. Later you'll want to use variables instead of fields. They execute much faster and don't clutter up the card with a lot of unnecessary objects.