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Author Topic: The Smallest Axiom Ever (Optimized GetKey routine) -  (Read 1137 times) Bookmark and Share
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« on: 23 May, 2011, 04:11:11 »
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First, this Axiom is super-small. Compiled, it's about 60 bytes.
Anyways, it is an optimized form of GetKey when you only want ONE of the four arrow-keys.
For example, if I'm making a maze game where the player can only move up, down, left, or right, but not 2 at once, this would be perfect.
The command is the Zoom In token, with no modifiers.
Also, the version for your calc is a program. If you have it in RAM when you compile something using it, Axe will convert it to an Appvar, and put it into archive. You can then delete the program.
* SpeedKey.z80 (0.43 KB - downloaded 83 times.)
* SpeedKey.8xp (0.11 KB - downloaded 71 times.)
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« Reply #1 on: 23 May, 2011, 04:16:00 »
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Hmm, this routine doesn't seem to really check that only one of the keys is pressed. For example, if you pressed all the arrow keys at once, it would return 1.
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« Reply #2 on: 23 May, 2011, 04:24:49 »
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Yes, but the purpose of the routine is that you only want one of the keys. The way I designed it means that the first one happens to be the down key, but it could be redesigned to allow for a different key to be checked first.
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« Reply #3 on: 23 January, 2012, 05:50:23 »
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I believe this is now the smallest axiom ever. Cheesy

The token for this axiom is Zoom Out. It returns what arrow keys are currently pressed. As an added bonus, opposite keys cancel each other out. For example, if both the left and right keys are pressed, then this axiom will return that neither key is pressed. This is useful if pressing a key results in a lot of computation, and pressing opposite keys results in nothing happening.

(In the following example, e is the euler e.)
Code: Select All | Copy To Clipboard

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#Axiom(SpeedKey)
Zoom Out→A
If Ae7
.down key pressed
End
If Ae6
.left key pressed
End
If Ae5
.right key pressed
End
If Ae4
.up key pressed
End

This axiom can also be used to easily check for 8 directions.
Code: Select All | Copy To Clipboard

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#Axiom(SpeedKey)
Zoom Out→A
If A=1
.south
ElseIf A=2
.west
ElseIf A=3
.south west
ElseIf A=4
.east
ElseIf A=5
.south east
ElseIf A=8
.north
ElseIf A=10
.north west
ElseIf A=12
.north east
End
* SpeedKey.8Xv (0.12 KB - downloaded 42 times.)
* speedkey.8xv (0.12 KB - downloaded 16 times.)
« Last Edit: 28 June, 2012, 23:36:23 by jacobly » Logged
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« Reply #4 on: 28 January, 2012, 01:42:25 »
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I'm sure someone could make a smaller Axiom that did nothing Tongue

Anyway, these seem useful. Do they do anything if a non-arrow key is pressed?
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