PsiNegative      1019 magick/geometry.c               flags^=PsiNegative;  /* negate sign */
PsiNegative      1027 magick/geometry.c               if ((flags&PsiNegative) != 0)
PsiNegative      1093 magick/geometry.c     (flags & PsiValue) ? ((flags & PsiNegative) ? "-Y" : "+Y") : "  ",