them once.
- solidify/matrix.h, solidify/matrix.c: 2D matrix operations
- solidify/Makefile (OBJS): added matrix.o
- solidify/face.h (struct matrix): moved to solidify/matrix.h
- solidify/overlap.c (point, merge_matrix, draw_map): precalculate a single
vA+b transformation instead of stepwise transforming the vector inside
the loop
- solidify/overlap.c (do_shift): now that the math is right (or at least
better), reverse the shift
- solidify/face.h (struct matrix), solidify/face.c (read_file): also record
the face's center
- solidify/overlap.c (point): reference faces to the screen center
- solidify/overlap.c (point): use correct model coordinates for z0
calculation
- solidify/face.h (face_z0): calculate height of z0 plane
- solidify/level.c (draw_image): use face_z0 instead of open-coding the
calculation
- solidify/overlap.c (draw_image, point): moved per-point processing from
draw_image() to point()
- solidify/overlap.c (point): show differences between both faces
- solidify/solidify.c (usage, main): load both faces
- solidify/solidify.c (usage, main): accept distance between faces as third
argument
- solidify/Makefile (OBJS): added overlap.o
- solidify/Makefile (CFLAGS): added -O9 to speed up rotation a little
- solidify/array.h, solidify/array.c (get_bounded): like get(), but returns
UNDEF if the indices are outside the array
- solidify/face.h (struct face, struct matrix), solidify/face.c (read_file):
added a 2D transformation matrix to "struct face"
- solidify/overlap.h, solidify/overlap.c: show a face with 2D transformation
- solidify/face.h (struct face), solidify/face.c (read_face),
solidify/level.c (draw_map, draw_image): introduce inclination of the z0
plane
- solidify/level.c (draw_map): make blue z == z0 display more continuous
- solidify/level.c (scroll_event): moved z0 shift to scroll_z
- solidify/level.c (scroll_event, scroll_xy): added manipulation of the
z0 plane's inclination
