X-Git-Url: https://git.distorted.org.uk/~mdw/sgt/puzzles/blobdiff_plain/3f98cd5a40321c18f87e4e732a75f56cc187cb1f..8b629657bab226e6a0f91d4f147d448b4c84be2f:/devel.but

diff --git a/devel.but b/devel.but
index 09f006c..096aa12 100644
--- a/devel.but
+++ b/devel.but
@@ -1456,6 +1456,26 @@ mid-end doesn't even bother calling \cw{anim_length()}
 each game. On the rare occasion that animated solve moves are
 actually required, you can set this flag.
 
+\dt \cw{REQUIRE_RBUTTON}
+
+\dd This flag indicates that the puzzle cannot be usefully played
+without the use of mouse buttons other than the left one. On some
+PDA platforms, this flag is used by the front end to enable
+right-button emulation through an appropriate gesture. Note that a
+puzzle is not required to set this just because it \e{uses} the
+right button, but only if its use of the right button is critical to
+playing the game. (Slant, for example, uses the right button to
+cycle through the three square states in the opposite order from the
+left button, and hence can manage fine without it.)
+
+\dt \cw{REQUIRE_NUMPAD}
+
+\dd This flag indicates that the puzzle cannot be usefully played
+without the use of number-key input. On some PDA platforms it causes
+an emulated number pad to appear on the screen. Similarly to
+\cw{REQUIRE_RBUTTON}, a puzzle need not specify this simply if its
+use of the number keys is not critical.
+
 \H{backend-initiative} Things a back end may do on its own initiative
 
 This section describes a couple of things that a back end may choose
@@ -2121,8 +2141,8 @@ function; see \k{drawing-draw-circle}.
 
 \c void (*draw_update)(void *handle, int x, int y, int w, int h);
 
-This function behaves exactly like the back end \cw{draw_text()}
-function; see \k{drawing-draw-text}.
+This function behaves exactly like the back end \cw{draw_update()}
+function; see \k{drawing-draw-update}.
 
 An implementation of this API which only supports printing is
 permitted to define this function pointer to be \cw{NULL} rather
@@ -2267,7 +2287,7 @@ of the puzzle.
 
 Similarly, \c{ym} and \c{yc} specify the vertical position of the
 puzzle as a function of the page height: the page height times
-\c{xm}, plus \c{xc} millimetres, equals the desired distance from
+\c{ym}, plus \c{yc} millimetres, equals the desired distance from
 the top of the page to the top of the puzzle.
 
 (This unwieldy mechanism is required because not all printing