MY_PI              42 tests/rotozoom.c     if(a<0) a= MY_PI-a; // 0..inf
MY_PI              43 tests/rotozoom.c     a %= 2*MY_PI;       // 0..2PI
MY_PI              45 tests/rotozoom.c     if(a>=MY_PI*3/2) a -= 2*MY_PI;  // -PI/2 .. 3PI/2
MY_PI              46 tests/rotozoom.c     if(a>=MY_PI/2  ) a = MY_PI - a; // -PI/2 ..  PI/2
MY_PI             270 tests/rotozoom.c     radian = 2*i*MY_PI/360;
MY_PI             272 tests/rotozoom.c     h_cos[i] = ( h * int_sin (radian + MY_PI/2) )/2/FIXP;