diff options
| -rw-r--r-- | README.org | 26 |
1 files changed, 18 insertions, 8 deletions
@@ -63,7 +63,8 @@ ** Features *** Sprites - Sprites encapsulate the presentation of a image or a region of an image. + Sprites encapsulate the presentation of an image or a region of an + image. The simplest way to get started with sprites is to use the =load-sprite= procedure. All arguments except the filename are @@ -78,8 +79,7 @@ same keyword arguments in =load-sprite= are also available here. #+BEGIN_SRC scheme - (define texture - (define sprite (make-sprite (load-texture "cirno.png")))) + (define sprite (make-sprite (load-texture "cirno.png"))) #+END_SRC Position, scale, rotation, color, and anchor are mutable. @@ -143,13 +143,23 @@ such that it does not halt further program execution. #+BEGIN_SRC scheme - (while #t - (walk 'up) - (wait 60) - (walk 'down) - (wait 60)) + (agenda-schedule + (colambda () + (while #t + (walk 'up) + (wait 60) + (walk 'down) + (wait 60)))) + #+END_SRC + =colambda= is a useful macro that is syntactic sugar for a lambda + expression executed as a coroutine. =agenda-schedule= accepts a + thunk (a procedure that takes 0 arguments) and schedules it to be + executed later. In this example we do not provide a second + argument to =agenda-schedule=, which means that the thunk will be + executed upon the next game update. + Since guile-2d enforces a fixed timestep and updates 60 times per second, waiting for 60 updates means that the NPC will wait one second in between each step. |