Scratch

Hello Moonshine! Changing the scene/background of a project is similar to changing a sprite's costume. First, you need to give the stage several backgrounds. For example, your said title background and forest background.

Now, I'm assuming you want the title background to come first, for obvious reasons. First, create the background as a costume for the stage.

The first script for the stage should be this:

when green flag clicked
switch to background [title v]

In order to switch backgrounds, you need a trigger, like pressing a button or the spacebar. This can be done with this script for the stage:

when green flag clicked
forever
if <key [space v] pressed?>
next background
end
end

Or you can create a new sprite to be a "button" and give the button a script like this:

when [button v] clicked
broadcast [next background v]

This will send a signal to the stage to change it's background.

You need to give the stage a script that tells it what to do when it gets the signal:

when I receive [next background v]
next background

This will make the background switch when the button sprite is pressed.

You can make this happen by other means, but those two are some simple examples.

Now, to get music for each different scene, first you have to make all the different backgrounds. Put these in chronological order (the order in which you want them to play out when your project is played). Then you need to find and get music for each scene.

You give this script to the stage:

**In this script, "background #1" is the title screen, and background #2 is the forest scene.

when green flag clicked
forever
if <(background #)=(1)>
play sound [title1 v] until done
end
if <(background #)=(2)>
play sound [forest1 v] until done
end
end

Keep on repeating the "if this=that, then play this song" for however many scenes you have.

There is actually a purple block for "background #", which you can find under "Looks" in the Stage. You put the "background #" block in the first space for the green block, and the # of the background in the second space. You can find out the background # by going to the Stage's "Background" tab. The number will be on the left of the picture, in the top left corner. This script tells the stage to play a certain sound whenever the background number is 1, 2, 3, etc.

There's a problem with the above script, though. If you don't tell it to wait for the song to finish, it will keep on playing the song forever! You will have to give it "stop all sounds" blocks, so if the scene switches, it will stop the previous song and go to the right one.

So the script will now look like this:

when green flag clicked
stop all sounds
forever
if <(background #)=(1)>
stop all sounds
play sound [title1 v] until done
end
if <(background #)=(2)>
stop all sounds
play sound [forest1 v] until done
end
end

There's still a problem, though. If you go to a different scene before the first song finishes playing, it will keep on going even after you switch the scene! So, you can use 'broadcast' blocks to fix the problem. You will need to put the above script under a different "hat block" (the first block on the script). It will look like this now:

when I receive [music v]
stop all sounds
forever
if <(background #)=(1)>
stop all sounds
play sound [title1 v] until done
end
if <(background #)=(2)>
stop all sounds
play sound [forest1 v] until done
end
end

Now, you will need to add "broadcast: music" to the script(s) that tell the stage to switch backgrounds. So,  your "switch scene" scripts will now look like this:

<when green flag clicked>
<forever>
if <key [space v] pressed?>
next background
broadcast [music v]
end
end

Or, if you are using a button:

when I receive [next background v]
next background
broadcast [music v]

Both of these go under "Stage".

Also, since the title screen is the first background you will see, you will have to add this:

when green flag clicked
stop all sounds
broadcast  [music v]

Now, whenever you switch the scene, it will play the right music!

Still confused? Sorry, I am not very good at explaining things.

Here's an example project you can download with all the scripts I mentioned before, so you can better understand:

Click me!

Last edited by 12_lassy (2012-03-17 12:13:06)

Welcome to Scratch, MoonshineKitty! 

MoonshineKitty wrote:

Thanks for responding everyone! I finally have my project up, and it really helped! 

Cool! I'll check it out.