diff options
Diffstat (limited to 'source/blender/blenlib/intern/rct.c')
| -rw-r--r-- | source/blender/blenlib/intern/rct.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/source/blender/blenlib/intern/rct.c b/source/blender/blenlib/intern/rct.c index 61e5783cd3e..d7ca749b600 100644 --- a/source/blender/blenlib/intern/rct.c +++ b/source/blender/blenlib/intern/rct.c @@ -571,3 +571,44 @@ void print_rcti(const char *str, const rcti *rect) printf("%s: xmin %d, xmax %d, ymin %d, ymax %d (%dx%d)\n", str, rect->xmin, rect->xmax, rect->ymin, rect->ymax, BLI_rcti_size_x(rect), BLI_rcti_size_y(rect)); } + + +/* -------------------------------------------------------------------- */ +/* Comprehensive math (float only) */ + +/** \name Rect math functions + * \{ */ + +#define ROTATE_SINCOS(r_vec, mat2, vec) { \ + (r_vec)[0] = (mat2)[1] * (vec)[0] + (+(mat2)[0]) * (vec)[1]; \ + (r_vec)[1] = (mat2)[0] * (vec)[0] + (-(mat2)[1]) * (vec)[1]; \ +} ((void)0) + +/** + * Expand the rectangle to fit a rotated \a src. + */ +void BLI_rctf_rotate_expand(rctf *dst, const rctf *src, const float angle) +{ + const float mat2[2] = {sinf(angle), cosf(angle)}; + const float cent[2] = {BLI_rctf_cent_x(src), BLI_rctf_cent_y(src)}; + float corner[2], corner_rot[2], corder_max[2]; + + ARRAY_SET_ITEMS(corner, src->xmin - cent[0], src->ymax - cent[1]); + ROTATE_SINCOS(corner_rot, mat2, corner); + corder_max[0] = fabsf(corner_rot[0]); + corder_max[1] = fabsf(corner_rot[1]); + + ARRAY_SET_ITEMS(corner, src->xmax - cent[0], src->ymax - cent[1]); + ROTATE_SINCOS(corner_rot, mat2, corner); + corder_max[0] = MAX2(corder_max[0], fabsf(corner_rot[0])); + corder_max[1] = MAX2(corder_max[1], fabsf(corner_rot[1])); + + dst->xmin = cent[0] - corder_max[0]; + dst->xmax = cent[0] + corder_max[0]; + dst->ymin = cent[1] - corder_max[1]; + dst->ymax = cent[1] + corder_max[1]; +} + +#undef ROTATE_SINCOS + +/** \} */ |