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author | Jaron <jaron@kent-dobias.com> | 2017-06-22 22:40:47 -0400 |
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committer | Jaron <jaron@kent-dobias.com> | 2017-06-22 22:40:47 -0400 |
commit | d59fc339a40a47405bfef8c1313e324adca70479 (patch) | |
tree | addf46044c3a1507bd4069797c6218c457b67e5f /lib/geometry.c | |
parent | f4a50f1332ff323c42aa9664292910fd78933c15 (diff) | |
parent | 4764d5d407347d4dd5990411b243b3ec4bd75bff (diff) | |
download | fuse_networks-d59fc339a40a47405bfef8c1313e324adca70479.tar.gz fuse_networks-d59fc339a40a47405bfef8c1313e324adca70479.tar.bz2 fuse_networks-d59fc339a40a47405bfef8c1313e324adca70479.zip |
lots of changes for merge
Diffstat (limited to 'lib/geometry.c')
-rw-r--r-- | lib/geometry.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/lib/geometry.c b/lib/geometry.c new file mode 100644 index 0000000..ec788f1 --- /dev/null +++ b/lib/geometry.c @@ -0,0 +1,55 @@ + +#include "fracture.h" + +int edge_to_verts(unsigned int width, bool periodic, unsigned int edge, + bool index) { + assert(edge < pow(width, 2)); + + int x = edge / width + 1; + int y = edge % width + 1; + + if (periodic) { + return (((index ^ (x % 2)) + 2 * ((y + (index ^ (!(x % 2)))) / 2) - 1) % + width + + (x - index) * width) / + 2; + } else { + return ((index ^ (x % 2)) + 2 * ((y + (index ^ (!(x % 2)))) / 2) + + (x - index) * (width + 1) - 1) / + 2; + } +} + +int dual_edge_to_verts(unsigned int width, bool periodic, unsigned int edge, + bool index) { + assert(edge < pow(width, 2)); + + int x = edge / width + 1; + int y = edge % width + 1; + + if (periodic) { + return (((index ^ (!(x % 2))) + 2 * ((y + (index ^ (x % 2))) / 2) - 1) % + width + + (x - index) * width) / + 2; + } else { + return ((index ^ (!(x % 2))) + 2 * ((y + (index ^ (x % 2))) / 2) + + (x - index) * (width + 1) - 1) / + 2; + } +} + +double dual_vert_to_coord(unsigned int width, bool periodic, unsigned int vert, + bool index) { + if (periodic) { + if (index) + return (2 * vert) % width + (2 * vert / width) % 2; + else + return 2 * vert / width; + } else { + if (index) + return (2 * vert) % (width + 1); + else + return (2 * vert) / (width + 1); + } +} |