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75 lines
3.5 KiB
Plaintext
75 lines
3.5 KiB
Plaintext
* Changing reachability
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(Backdrops which can only be examined; Waterworld)
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A backdrop which the player can examine, but cannot interact with in any other way.
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It's tempting to handle the player's inability to interact with something with a simple instead rule:
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{*}"Waterworld 1"
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A view is a kind of backdrop. Instead of doing something other than examining to a view, say "You are too far from [the noun] to do anything but look."
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The sun is a view. It is everywhere. The description is "A blazing sun makes you wish you had never been born."
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The Sahara is a room. North of the Sahara is More Sahara. North of More Sahara is Yet Further Sahara.
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Test me with "x sun / get sun / n / x sun / n / x sun".
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Unfortunately, the rule does not address the case where the object in question is the second noun; so for instance the following example reveals the difficulty:
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{*}"Waterworld 2"
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A view is a kind of backdrop. Instead of doing something other than examining to a view, say "You are too far from [the noun] to do anything but look."
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The player carries a rope.
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The sun is a view. It is everywhere. The description is "A blazing sun makes you wish you had never been born."
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The Sahara is a room. North of the Sahara is More Sahara. North of More Sahara is Yet Further Sahara.
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Test me with "x sun / get sun / n / x sun / n / x sun / tie rope to the sun".
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...where the response here behaves as though the sun is in reach. If we had a fully implemented tying action, the player would (even more disastrously) be allowed to lasso celestial objects.
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We could add a second instead rule as well:
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{*}"Waterworld 3"
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A view is a kind of backdrop.
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Instead of doing something other than examining when the noun is a view:
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say "You are too far from [the noun] to do anything but look."
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Instead of doing something other than examining when the second noun is a view:
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say "You are too far from [the second noun] to do anything but look."
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The player carries a rope.
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The sun is a view. It is everywhere. The description is "A blazing sun makes you wish you had never been born."
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The Sahara is a room. North of the Sahara is More Sahara. North of More Sahara is Yet Further Sahara.
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Test me with "x sun / get sun / n / x sun / n / x sun / tie rope to sun".
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This produces acceptable output again, but there is a more elegant way, one that works better with Inform's existing world model. Currently the default model assumes that accessibility -- whether the player can reach something or not -- is checked between the Before... rules and the Instead... rules. We can add our own accessibility rules, including this one to govern whether views are accessible. So for instance:
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{*}"Waterworld 4"
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A view is a kind of backdrop.
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The can't touch views rule is listed before the access through barriers rule in the accessibility rulebook.
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Accessibility rule (this is the can't touch views rule):
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if the action requires a touchable noun and the noun is a view:
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say "You are too far from [the noun] to do anything but look." instead;
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if the action requires a touchable second noun and the second noun is a view:
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say "You are too far from [the second noun] to do anything but look." instead;
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The player carries a rope.
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The sun is a view. It is everywhere. The description is "A blazing sun makes you wish you had never been born."
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The Sahara is a room. North of the Sahara is More Sahara. North of More Sahara is Yet Further Sahara.
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Test me with "x sun / get sun / n / x sun / n / x sun / tie rope to sun".
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Now our new accessibility rule fits into its proper stage.
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