Creating a Triangle wave from a Sine wave in C++

StackOverflow https://stackoverflow.com/questions/7400834

문제

I am having trouble finding out how to form a triangle (not sawtooth) wave from a sine wave.

I understand how to create it for a Square wave:

if( sineValue >= 0 )
        value = amp;
    else
        value = -amp;

But I am not sure how to change this to accommodate for a triangle wave.

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