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37 lines
2 KiB
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37 lines
2 KiB
Plaintext
* Writing and reading tables to external files
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(Preferences file loaded on replaying; Alien Invasion Part 23)
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Keeping a preference file that could be loaded by any game in a series.
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Suppose that we have a series of games each of which allows the player to select a puzzle difficulty level. When the player plays a new game in the series, we want him to start out by default with the same difficulty level he faced earlier on, so we store this information in a small preferences file, as follows:
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{*}"Alien Invasion Part 23"
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A difficulty is a kind of value. The difficulties are easy, moderate, hard, and fiendish.
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Understand "use [difficulty] puzzles" as selecting difficulty. Selecting difficulty is an action out of world, applying to one difficulty.
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Carry out selecting difficulty:
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choose row 1 in the Table of Preference Settings;
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now challenge level entry is difficulty understood;
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say "Puzzles will be [challenge level entry] from now on."
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The File of Preferences is called "prefs".
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When play begins:
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if File of Preferences exists:
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read File of Preferences into the Table of Preference Settings;
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choose row 1 in the Table of Preference Settings;
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say "(The current puzzle difficulty is set to [challenge level entry].)"
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Check quitting the game:
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write File of Preferences from the Table of Preference Settings.
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Table of Preference Settings
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challenge level
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easy
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The Sewer Junction is a room.
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Our preference file is restricted to a single option here for simplicity's sake, but we could keep track of more information -- whether the player preferred verbose or brief room descriptions, screen configurations, and so on.
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If we were disposed to be somewhat crueler, we could use a similar method to make the player finish each episode of the series in order to "unlock" the next. All we would need to do is store a numerical password in our preferences file when the player finished a given level; the next level would check, say, the Table of Completed Levels for that password, and refuse to play unless the right number were present. |