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Introduction to Inform Game Engine and PunyInform Library

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10/10/2021 1
Inform Game Engine
and the PunyInform Library
Wilfried Elmenreich
Many thanks to Gareth Rees for the slides
a...

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10/10/2021 2
Need at Least One Object
Object BroomCloset "Broom Closet"
with
description "You're in the rather dirty broom...

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10/10/2021 3
Initialise Function
[Initialise;
print "^^You wake up with a headache. Yesterday's
events are only a blur. So...

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Introduction to Inform Game Engine and PunyInform Library

  1. 1. 10/10/2021 1 Inform Game Engine and the PunyInform Library Wilfried Elmenreich Many thanks to Gareth Rees for the slides about the Inform engine mechanisms
  2. 2. 10/10/2021 2 Need at Least One Object Object BroomCloset "Broom Closet" with description "You're in the rather dirty broom closet of The Red Anchor. Various cleaning appliances line the walls. There's a pile of fabric in a corner.", e_to BroomClosetDoor, has light;
  3. 3. 10/10/2021 3 Initialise Function [Initialise; print "^^You wake up with a headache. Yesterday's events are only a blur. So just another normal day for you...^^"; thedark.short_name = "Your view is very blurry."; thedark.description = "You cannot see much because of the rag over your eyes. You should eventually disrobe it."; player.add_to_scope = PlayerAddToScope; ];
  4. 4. 10/10/2021 4 Return Codes • A routine inside an object returns 0 (false) by default • A routine outside of an object returns 1 (true) by default. • You can override this default using the `return', `rtrue' and `rfalse' statements, or by omitting the `print' instruction from a print statement.
  5. 5. 10/10/2021 5 Meaning of Return Codes `before‘ `life' – True (1) means that the routine has successfully and completely dealt with the player's input, and the library shouldn't do anything more. – False (0) means that the usual library rules should now apply to the player's input (note that this doesn't necessarily mean that the routine has done nothing).
  6. 6. 10/10/2021 6 Meaning of Return Codes `after' – True (1) means that the `after' routine has printed a suitable response to the player's input, and the library shouldn't do anything more. – False (0) means that the usual library message should now be printed (again, this doesn't necessarily mean that the routine has done nothing).
  7. 7. 10/10/2021 7 Before and After • ‘before’ – Should be used to change completely the effect of a particular action • ‘after’ – Should be used to change the message associated with a particular action
  8. 8. 10/10/2021 8 Meaning of Return Codes `describe' – True (1) means that the `describe' routine has printed a suitable description. The library shouldn't add anything else. – False (0) means that the library should print the usual description of the object.
  9. 9. 10/10/2021 9 Programming Tip • In an object's `before' routine, it's very common to want to – execute some code – print some text to tell the player what has happened – return 1 to prevent the library from doing anything else. • A good trick in this situation is to omit the `print' keyword from the last print statement.
  10. 10. 10/10/2021 10 Simple Object Object -> Note "note" with name 'note', description "The note says 'Be sure to know where your towel is'.", initial "A note has been fixed to the wall with a knife.", after [; Take: if(Knife hasnt moved && self hasnt general) { ! Use the general attribute to say we've already pulled ! the note from the wall, so we don't print this twice. give self general; move knife to player; "The knife rips a long hole in the note as you pull the note from the wall."; } ];
  11. 11. 10/10/2021 11 Scenery Object Object -> Rainpipe "rainpipe" with name 'rainpipe' 'pipe', description "A rainpipe leading down from the roof and ending right under the balcony. When it's raining, it splashes water on the pedestrians 10 meters below.", before [; Climb: print "You carefully climb up on the rainpipe.^"; PlayerTo(TheRoof); rtrue; ], has scenery;
  12. 12. 10/10/2021 12 Building and Testing the Game Compile the game using the Inform6 compiler inform6 -v3 +lib game.inf Testing under Windows with Frotz Building a C64 version with Ozmoo ruby make.rb -S1 -f fontsdesoftwriter-ger.fnt -dd -rc:8=15 -dc:6:9 - bc:6 -sc:15 -i houseonahill.kla buccaneers_cache_r2.z3 Z-Code Interpreters for many platforms available

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