How to decrease value by increasing other value

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Ok, so, i created custom control volume for some media player, for silent sound is -10000 and for full sound is 0, i searched all over google and i din't found anything, so, how do i decrease -10000 to 0 when i increase value to 100.

What I have tried:

I created two properties:

VB

Public Property SetVolume() As Integer
        Get
            Return _SetVolume
        End Get
        Set(val As Integer)
            _SetVolume = val
            Refresh()
        End Set
    End Property

        Public Property Volume() As Integer
        Get
            Return _VolumeBar.Volume
        End Get
        Set(Val As Integer)
            _VolumeBar.Volume = Val
            Invalidate()
        End Set
    End Property

i tried to decrease SetVolume when i increase Volume.

VB

MediaPlayerVolume1.SetVolume = MediaPlayerVolume1.Volume
TxtVolume.Text = Trim(-10000 * MediaPlayerVolume1.SetVolume / 100)

I use "TxtVolume.Text" just for testing, to check if is working or not.

Posted 26-Apr-18 5:39am

Florin Pănescu

Updated 26-Apr-18 6:31am

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Comments

Richard MacCutchan 26-Apr-18 11:51am

-10000 + 100 = -9900.

Your question is not clear.

Florin Pănescu 26-Apr-18 12:01pm

I can't be more clear then that.
I created custom control, like progressbar, i use that control for increase volume, the problem is, for silent is -10000 and for full is 0, i set progressbar maximum to 100, when i increase value to 100, i want other value to decrease until 0.

Richard MacCutchan 26-Apr-18 12:15pm

If the maximum is 100 then 1 is (10000 / 100) which is 100. So for every 1 step on the progress bar you increase the volume value by 100. So increase to 1 will be -10000 + 100 = -9900, and increase to 100 will be -10000 + (100 * 100) = -10000 + 10000 = 0.

2 solutions

Solution 1

Get your 0 to 100 reading, multiply it by -100.

0   ->      0
1   ->   -100
...
100 -> -10000

If you need it reversed, then get your 0 to 100 reading, multiply it by 100 and subtract it from 10000:

0   -> -10000
1   ->  -9900
...
100 ->      0

Posted 26-Apr-18 6:16am

OriginalGriff

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Florin Pănescu · Accepted Answer · 2018-04-26T06:32:00

Oh there ya go, thank you guys for that math solutions, @Richard MacCutchan i tried your solution, what i do is set progressbar Maximum to 10000, it looks like this:

VB

MediaPlayerVolume1.SetVolume = MediaPlayerVolume1.Volume
TxtVolume.Text = Trim(-10000 + (100 * 100) - 10000 + MediaPlayerVolume1.SetVolume)

With your math is working, i want your brain dude :)
Thank you guys so much for helping me.