mirror of
https://github.com/ganelson/inform.git
synced 2024-07-05 16:44:21 +03:00
69 lines
4 KiB
Plaintext
69 lines
4 KiB
Plaintext
** Understanding things by their relations
|
|
(Photographs referred to by subject matter--Camera producing instant photographs; Claims Adjustment)
|
|
An instant camera that spits out photographs of anything the player chooses to take a picture of.
|
|
|
|
We start by creating a camera and a photograph object. As usual when we want to have a kind of object that can be dispensed in bulk, we start off with a bunch of identical instances of the object out of play (in this case, kept in an out-of-play container called "film roll"); we can then move them into play and give them characteristics when they're needed.
|
|
|
|
Each photograph can depict exactly one thing -- we're assuming that the player is not a landscape photographer here -- so we create a relation to indicate what is shown by each photograph. We'll then use that relation to determine how photographs are described, named, and parsed:
|
|
|
|
{*}"Claims Adjustment"
|
|
|
|
A photograph is a kind of thing. 36 photographs are in the film roll.
|
|
|
|
Appearance relates one thing to various photographs. The verb to be shown by means the appearance relation.
|
|
|
|
The description of a photograph is usually "It shows [a random thing which is shown by the item described]."
|
|
|
|
Understand "of [something related by reversed appearance]" as a photograph.
|
|
|
|
This allows the player to refer to any photograph by its subject: useful if we have a large number of them.
|
|
|
|
Now we create an action to let the player use the camera and generate these photograph objects:
|
|
|
|
{**}The player carries a cheap instant camera.
|
|
|
|
Understand "photograph [something] with [camera]" as photographing. Understand "photograph [something] with [something preferably held]" as photographing. Photographing is an action applying to one visible thing and one carried thing, requiring light.
|
|
|
|
The photographing action has an object called the selected film.
|
|
|
|
Setting action variables for photographing:
|
|
let N be a random photograph in the film roll;
|
|
now the selected film is N.
|
|
|
|
Check photographing:
|
|
if the second noun is not the camera, say "You need a camera for that purpose." instead.
|
|
|
|
Check photographing:
|
|
if the noun is the camera, say "Sadly impossible." instead.
|
|
|
|
Check photographing:
|
|
if the selected film is nothing, say "You're out of film." instead.
|
|
|
|
Carry out photographing:
|
|
now the noun is shown by the selected film;
|
|
move the selected film to the player.
|
|
|
|
Report photographing:
|
|
say "Your camera instantly spits out [a selected film]."
|
|
|
|
Now we use two activities from the Activities chapter to describe the photographs to the player more elegantly:
|
|
|
|
{**}After printing the name of a photograph (called target):
|
|
say " of [a random thing which is shown by the target]".
|
|
|
|
After printing the plural name of a photograph (called target):
|
|
let N be the holder of the target;
|
|
say " of [a list of things which are shown by photographs which are held by N]";
|
|
if the number of things which are shown by photographs which are held by N is greater than one, say " (variously)".
|
|
|
|
And finally we provide a brief scenario to give the player something to take pictures of:
|
|
|
|
{**}The Treasure Room is a room. "Despite the fancy name, this is no more than a closet -- albeit a closet with its own special circuit on the house alarm."
|
|
|
|
The Treasure Room contains a small Degas, a Ming vase, and a collection of South African krugerrands. The player is carrying insurance forms, a first-class stamp, and a security envelope.
|
|
|
|
The description of the forms is "Completely filled out in black ink in block letters: now all you need to do is attach photographic evidence of the objects you wish to insure."
|
|
|
|
Test me with "photograph degas / i / photograph degas / i / x photograph of degas / photograph me / x photograph of me / i / photograph vase / photograph camera / photograph collection / g / i / test more".
|
|
|
|
Test more with "x photograph of collection / x photograph of krugerrands / x photograph of collection of south african krugerrands / photograph photograph of degas / x photograph of photograph of degas". |