evaluator of pi

[Operarus]

Hello all, I've made simple demo, see the code:

And result:

This also can move by mouse click.

Pi calculates by formula: (all chars - space chars) * 4 / ( all chars ), no math.pi or contants use.
This formula is derived from S = pi * r^2.
if you need, i can send readable code.

[Ranguna259]

The color palette looks very nice, this is simple yet beautiful.