How to calculate the value from the slider

[MarbleXeno]

Hello, i've created simple menu and now im working on a slider for changing the volume but i dont know how to calculate the value from the slider to change the volume of the music. I know, this is really dumb question, its simple math but for some reason i can't calculate it! I would be grateful for some pattern.

[Laurent]

// map the slider position to [0 .. 1]
auto ratio = static_cast<float>(y_cursor - y_slider_min) / (y_slider_max - y_slider_min);

// map the current position in [0 .. 1] to a volume value
auto volume = ratio * (volume_max - volume_min) + volume_min;

[MarbleXeno]

Thank you very much, it worked.