diff options
Diffstat (limited to 'misc.c')
| -rw-r--r-- | misc.c | 29 |
1 files changed, 29 insertions, 0 deletions
@@ -280,6 +280,35 @@ int c2pos(int w, int h, int cx, int cy) return -1; /* not reached */ } +int c2diff(int w, int h, int cx, int cy, int button) +{ + int diff = 0; + + assert(IS_CURSOR_MOVE(button)); + + /* Obvious moves around edge. */ + if (cy == -1) + diff = (button == CURSOR_RIGHT) ? +1 : (button == CURSOR_LEFT) ? -1 : diff; + if (cy == h) + diff = (button == CURSOR_RIGHT) ? -1 : (button == CURSOR_LEFT) ? +1 : diff; + if (cx == -1) + diff = (button == CURSOR_UP) ? +1 : (button == CURSOR_DOWN) ? -1 : diff; + if (cx == w) + diff = (button == CURSOR_UP) ? -1 : (button == CURSOR_DOWN) ? +1 : diff; + + if (button == CURSOR_LEFT && cx == w && (cy == 0 || cy == h-1)) + diff = (cy == 0) ? -1 : +1; + if (button == CURSOR_RIGHT && cx == -1 && (cy == 0 || cy == h-1)) + diff = (cy == 0) ? +1 : -1; + if (button == CURSOR_DOWN && cy == -1 && (cx == 0 || cx == w-1)) + diff = (cx == 0) ? -1 : +1; + if (button == CURSOR_UP && cy == h && (cx == 0 || cx == w-1)) + diff = (cx == 0) ? +1 : -1; + + debug(("cx,cy = %d,%d; w%d h%d, diff = %d", cx, cy, w, h, diff)); + return diff; +} + void pos2c(int w, int h, int pos, int *cx, int *cy) { int max = w+h+w+h; |