ggggllllMMMMaaaappppGGGGrrrriiiidddd1111dddd,,,, ggggllllMMMMaaaappppGGGGrrrriiiidddd1111ffff,,,, ggggllllMMMMaaaappppGGGGrrrriiiidddd2222dddd,,,, ggggllllMMMMaaaappppGGGGrrrriiiidddd2222ffff - define a one- or
ggggllllMMMMaaaappppGGGGrrrriiiidddd1111 specifies a single linear mapping such that integer grid
coordinate 0 maps exactly to _u_1, and integer grid coordinate _u_n maps
exactly to _u_2. All other integer grid coordinates i are mapped so that
u = i(u2-u1)/un + u1
ggggllllMMMMaaaappppGGGGrrrriiiidddd2222 specifies two such linear mappings. One maps integer grid
coordinate i = 0 exactly to _u_1, and integer grid coordinate i = un
exactly to _u_2. The other maps integer grid coordinate j = 0 exactly to
_v_1, and integer grid coordinate j = vn exactly to _v_2. Other integer grid
coordinates i and j are mapped such that
u = i(u2-u1)/un + u1
v = j(v2-v1)/vn + v1
The mappings specified by ggggllllMMMMaaaappppGGGGrrrriiiidddd are used identically by ggggllllEEEEvvvvaaaallllMMMMeeeesssshhhh
and ggggllllEEEEvvvvaaaallllPPPPooooiiiinnnntttt.
EEEERRRRRRRROOOORRRRSSSS
GGGGLLLL____IIIINNNNVVVVAAAALLLLIIIIDDDD____VVVVAAAALLLLUUUUEEEE is generated if either _u_n or _v_n is not positive.
GGGGLLLL____IIIINNNNVVVVAAAALLLLIIIIDDDD____OOOOPPPPEEEERRRRAAAATTTTIIIIOOOONNNN is generated if ggggllllMMMMaaaappppGGGGrrrriiiidddd is executed between the
execution of ggggllllBBBBeeeeggggiiiinnnn and the corresponding execution of ggggllllEEEEnnnndddd.