Millisecond Forums

You don't need 128 <picture> elements. You need a single <picture> element with 128 items and then you can "navigate" through them by increasing a global variable (a <values> entry) by one on a trial by trial basis.

<picture image_name>
/ items = image_name_items
/ select = values.image_name_item
...
</picture>

<item image_name_items>
/ 1 = "body_1.jpg"
...
/ 128 = "body_128.jpg"
</item>

if (trial.choice.response == "pumpbutton") {
 values.image_name_item +=1}]

Hi Dave,

thank you very much for your help. I have now modified the script and put below the instructions:

<item instructions>
...
<instructions>

<item body_items>
/ 1 = "body_1.jpg"
/ 2 = "body_2.jpg"
/ 3 = "body_3.jpg"
/ 4 = "body_4.jpg"
</item>

then instead of the 

<picture balloon>
/ items = ("balloon.jpg")
/ position = (33%, 83%)
/ valign = bottom
/ size = (100%, 100%)
/ erase = false
</picture>

I have put 

<picture body>
/ items = body_items
/ select = values.body_item
/ position = (33%, 83%)
/ valign = bottom
/ size = (100%, 100%)
/ erase = false
</picture>

Then after 
if (trial.choice.response == "pumpbutton") {

I put 

values.image_name_item +=1}]
but without closing the square bracket and I have deleted

picture.balloon.width += parameters.balloonsizeincrement;
picture.balloon.height += parameters.balloonsizeincrement;
shape.blank.width = picture.balloon.width;
shape.blank.height = picture.balloon.height;

When I try to run the script I receive an error message in Element: trial.choice and the messages says: expression 'values.body_item' is invalid. Expression contains an unknown element or property name.

I cannot understand what I should do...

The error message means the script cannot find a <value> called "body_item" defined anywhere in the script, which you reference here:

<picture body>
/ items = body_items
/ select = values.body_item
/ position = (33%, 83%)
/ valign = bottom
/ size = (100%, 100%)
/ erase = false
</picture>

You need to define that global variable in the <values> element and update it accordingly in your <trial>s or elsewhere throughout the script.

Hi Dave,

thank you very much for your help. in the script there is a part where the <values> are specified:
<values>
/ completed = 0
/ totalearnings = 0.0
now I have added
/ imagenumber = 0

the script runs but it get stucked when it tries to find image number 129. I am not sure where in the script I sould specify that the images number are from 1:129. 
if (trial.choice.response == "pumpbutton") {
values.imagenumber +=1; here i should put until 128?
shape.blank.width = shape.blank.width;
shape.blank.height = shape.blank.height ;
values.pumpcount += 1;
if (values.pumpcount > 1) {
values.mean_timebtwpumps = values.sum_timebtwpumps / (values.pumpcount-1);

How do I know which image is selected on the first trial thoughout the script? (I mean where I have to look in the script to eventually modify it).

Thanks again, I really appreciate your help.

Eleonora

What you need to to is reset values.imagenumber back to 0 at the start of each "round" in the task. You do that in <trial init>.

<trial init>
/ ontrialbegin = [
...
    values.countchoice = 0;
    values.imagenumber = 0;
]
...
</trial>

I can not thank you enough! It works!