diff options
| -rw-r--r-- | src/openttd.cpp | 32 |
1 files changed, 20 insertions, 12 deletions
diff --git a/src/openttd.cpp b/src/openttd.cpp index 4e3d244a8..a84030903 100644 --- a/src/openttd.cpp +++ b/src/openttd.cpp @@ -1055,24 +1055,32 @@ static void ScrollMainViewport(int x, int y) WP(w,vp_d).dest_scrollpos_y += ScaleByZoom(y, w->viewport->zoom); } } - +/** + * Describes all the different arrow key combinations the game allows + * when it is in scrolling mode. + * The real arrow keys are bitwise numbered as + * 1 = left + * 2 = up + * 4 = right + * 8 = down + */ static const int8 scrollamt[16][2] = { - { 0, 0}, + { 0, 0}, ///< no key specified {-2, 0}, ///< 1 : left { 0, -2}, ///< 2 : up - {-2, -1}, ///< 3 : left + up + {-2, -1}, ///< 3 : left + up { 2, 0}, ///< 4 : right - { 0, 0}, ///< 5 : left + right + { 0, 0}, ///< 5 : left + right = nothing { 2, -1}, ///< 6 : right + up - { 0, -2}, ///< 7 : left + right + up = up + { 0, -2}, ///< 7 : right + left + up = up { 0 ,2}, ///< 8 : down - {-2 ,1}, ///< 9 : down+left - { 0, 0}, ///< 10 : impossible - {-2, 0}, ///< 11 : left + up + down = left - { 2, 1}, ///< 12 : down+right - { 0, 2}, ///< 13 : left + right + down = down - { 0, -2}, ///< 14 : left + right + up = up - { 0, 0}, ///< 15 : impossible + {-2 ,1}, ///< 9 : down + left + { 0, 0}, ///< 10 : down + up = nothing + {-2, 0}, ///< 11 : left + up + down = left + { 2, 1}, ///< 12 : down + right + { 0, 2}, ///< 13 : left + right + down = down + { 2, 0}, ///< 14 : right + up + down = right + { 0, 0}, ///< 15 : left + up + right + down = nothing }; static void HandleKeyScrolling() |