Scratch

A few people have asked this question recently. If you'd also like some extra information on volume sliders for your games then this post might help you 

You can use a sprite to make a slider. Choose a length of slider, x. This can be anywhere from 2 pixels to 480 pixels, though the larger it is the more control the player has on setting the sound. Now define where the slider is, for example my slider will be 120 pixels long, and will be in position x=0 to x=120. The y co-ordinate is irrelevant. Now construct a script on the slider sprite, the slider should be something like a small circle the player can drag.

when gf clicked
Forever
If <<touching [mouse-pointer v]?> and <mouse down?>>
if <<(mouse x) > (-1)> and <(mouse x) < (181)>>
Set x to (mouse x)
end
end
if <(x position) < (0)>
Set x to (0)
end 
if <(x position) > (180)>
Set x to (180)
end 

This will make the slider go to the mouse within the confines of the boundary we defined, in this case 0 to 180 (note how to allow x=0 and x=180 I set the confines to x=-1 and x=181).

Now, we'll need to set the sound to this value. As the sound works as a percentage, we can change this slider value to a % value too. As my slider is 180 pixels long, to find out the % we can use this:

(((x position) / (180)) * (100))

If your slider doesn't start at x=0, we'll need to change the script a bit, this time the length is still 180, but starts at x=20 and ends at x=200:

((((x position) - (20)) / (180)) * (100))

And thus the general formula for ANY starting x=n and length=l becomes:

((((x position) - (n)) / (l)) * (100))

Set the volume % to this value and then you have a slider 

when gf clicked
forever
Set volume to ((((x position) - (n)) / (l)) * (100)) %

I hope this helps 

Last edited by Prestige (2012-07-19 08:25:51)