How to make an image flash 120 beats per minute

[Martial Foucault]

Hi,

How to make an image flash 120 beats per minute.

I dont know how to configure that 

Thanks a lot

[Chris Ward]

Hi Martial

Depends on what an Image flash actually is, but hopefully you can modify the code below to suit your requirements. Project File "Image_Flash.aia" attached.

[TimAI2]

Also recommend reading the post regarding the same topic:

https://groups.google.com/forum/#!searchin/mitappinventortest/metronome%7Csort:date/mitappinventortest/2SoKmgGVYvI/ya8DRoPNFgAJ

[Martial Foucault]

OOhh that's a great starting point. you're so quick

I have some difficulties to know how to organise the code

If I want 5 buttons with each one a specific BMP, is the best way to copy the block "When Button_1 clic" and change the name of the button and the divide operation ?

Or there is a simpler way to do that ?

I don't want a long code if i can do it shorter

Thank

[TimAI2]

You could use a listpicker with a selection of beats per minute listed

User picks one, then use the after picking event to set things in motion

[Martial Foucault]

yes the list picker can be an option, but I need something really simple => push a button and the picture blinks

[Chris Ward]

Hi Martial

I think a List View or List Picker would be easy to use. If you only require a few selections, you can do it with buttons, something like this (untested!):

Right-click on the above image and select "open image in new tab" to view it full scale, with mouse zoom.

See attached Project File "Image_Flash_02.aia"

[Chris Ward]

Actually, the Stop Button should be in the Timer Block too, otherwise it simply won't work! (slaps head)

Modified:

See the attached Project " Image_Flash_03.aia"

[Martial Foucault]

That's work like a charm.

How can I indicate to change the button color when selected, I tried with "when button .click " but it don't change to its original color when I click other button

[Angel M]

One example https://play.google.com/store/apps/details?id=appinventor.ai_angelcoatl84.COMUNICACION

[TimAI2]

You need to set the button colour to 0 or -1 (can't remember which) to get back to the standard button colour.

[Chris Ward]

Hi Martial

We already have an If - ElseIf to know which is the Active Button, so we can just set it's colour there. Just before, set all buttons back to their normal colour:

See the attached Project " Image_Flash_04.aia"

[Martial Foucault]

Thanks Chris, i don't know how much time I need to find and organize project like you do :))

I have one doubt, for exemple, when I chose the button 120, the image is shown each 2 beats, One beat visible, one beat invisible. So in fact the image beats 60 BPM.

Is it right ?

Hope I'm clear

[TimAI2]

Correct, selected bpm needs to be multiplied by 2

[Chris Ward]

Hi Martial

You and Tim are right :)

What we have (Image_Flash_04 example)  is one minute divided by required beats per minute - since it is hard coded, you can just change the BMP number in the "when any Button .Click" block: