Why is alpha treated differently in a while loop?

[q2apro]

Using the function from #739 gives me great wedges/angles using:

anglemark((0,0), 0, 45, cradius, true, (0,0,1), 0.1);
anglemark((0,0), 45, 90, cradius, true, (0,0,1), 0.1);
anglemark((0,0), 90, 135, cradius, true, (0,0,1), 0.1);
// ...

Result:

Using a while loop with the same function, however, adds to the alpha value on each loop. Even though the alpha value is the same with 0.1 all the time!

i = 0;
pieces = 16;
pieceangle = 360/pieces;
while(
	i<=pieces,
	anglemark((0,0), i*pieceangle, pieceangle, cradius, true, (0,0,1), 0.1);
	i = i+1;
);

Result:

1. Why is alpha added with each fill() call?
2. How to have a fixed alpha value?

Thanks in advance!

[q2apro]

Update:

It seems that it is not a scope problem, the alpha problem also occurs with this code:

i = 0;
pieceangle = 360/pieces;
anglemark((0,0), i*pieceangle, pieceangle, cradius, true, (0,0,1), 0.1);
i=1+i;
anglemark((0,0), i*pieceangle, pieceangle, cradius, true, (0,0,1), 0.1);
i=1+i;
anglemark((0,0), i*pieceangle, pieceangle, cradius, true, (0,0,1), 0.1);
i=1+i;
anglemark((0,0), i*pieceangle, pieceangle, cradius, true, (0,0,1), 0.1);
i=1+i;
anglemark((0,0), i*pieceangle, pieceangle, cradius, true, (0,0,1), 0.1);
i=1+i;
anglemark((0,0), i*pieceangle, pieceangle, cradius, true, (0,0,1), 0.1);
i=1+i;
anglemark((0,0), i*pieceangle, pieceangle, cradius, true, (0,0,1), 0.1);
i=1+i;
anglemark((0,0), i*pieceangle, pieceangle, cradius, true, (0,0,1), 0.1);
i=1+i;

[montaga]

Its not a bug.
You are overpainting something with alpha again and again and therefore it gets more opac. Probably you like something as

anglemark((0,0), i*pieceangle, (i+1)*pieceangle, cradius, true, (0,0,1), 0.1);

instead of

anglemark((0,0), i*pieceangle, pieceangle, cradius, true, (0,0,1), 0.1);

[q2apro]

Stupid me 🤦‍♂️

Thank you Aaron!