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Play sounds
In this tutorial, we are going to play sounds, multiple sounds in the same time.
Do as in Hello World tutorial except that you change the names: playSounds
, playSounds.html
, playSounds.fg
.
Copy the files ducks.mp3
, birds.mp3
, barking.mp3
into the directory playSounds
.
Write these lines into playSounds.fg
:
parallel ||
playSoundFile('ducks.mp3')
||
playSoundFile('birds.mp3')
||
playSoundFile('barking.mp3')
displayNewMessage('The End')
The program is made up of two parts:
parallel ||
playSoundFile('ducks.mp3')
||
playSoundFile('birds.mp3')
||
playSoundFile('barking.mp3')
and
displayNewMessage('The End')
Note
The second part is executed only when the first part is finished (as usual).
The first part is a block (that I called 'parallel
construct'):
parallel ||
block1
||
block2
||
block3
executes "block1", "block2" and "block3" in parallel (just logical parallelism).
Note
Beware that the 'parallel
construct' finished only when all the three blocks are finished.
So when you load playSounds.html
, here is the timeline:
If you change a little the program (add exitAfter 2 finished
just after the parallel
word):
parallel exitAfter 2 finished ||
playSoundFile('ducks.mp3')
||
playSoundFile('birds.mp3')
||
playSoundFile('barking.mp3')
displayNewMessage('The End')
when the two blocks that finished first (playSoundFile('barking.mp3')
and playSoundFile('ducks.mp3')
) are finished,
all the remaining blocks (in this case, just playSoundFile('birds.mp3')
) are discontinued and the parallel
construct finishes.
So that the 'The End' message is displayed. Here is the timeline:
If you change again a little the program (put exitWith branch 3
just after the parallel
word):
parallel exitWith branch 3 ||
playSoundFile('ducks.mp3')
||
playSoundFile('birds.mp3')
||
playSoundFile('barking.mp3')
displayNewMessage('The End')
when the third (in order of writing) block (playSoundFile('barking.mp3')
) is finished,
all the remaining blocks (in this case, playSoundFile('ducks.mp3')
and playSoundFile('birds.mp3')
) are discontinued and the parallel
construct finishes.
So that the 'The End' message is displayed. Here is the timeline:
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