FileEX at 10:47, 13 July 2024

2024-07-13T10:47:23Z

← Older revision		Revision as of 10:47, 13 July 2024
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	addEventHandler("onResourceStart", getRootElement(), ResourceStarted)		addEventHandler("onResourceStart", getRootElement(), ResourceStarted)
	</syntaxhighlight>		</syntaxhighlight>

			[[Category:Scripting Concepts]]

Chumillas at 11:34, 14 July 2010

2010-07-14T11:34:44Z

← Older revision		Revision as of 11:34, 14 July 2010
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	~~{{CatUp\|Common Code Snippets}}~~
	This page contains general purpose code snippets.		This page contains general purpose code snippets.

Chumillas: Created page with '{{CatUp|Common Code Snippets}} This page contains general purpose code snippets. ''(You can test your code in http://www.lua.org/demo.html)'' = Mathematical Snippets = === G…'

2010-07-14T11:34:09Z

Created page with '{{CatUp|Common Code Snippets}} This page contains general purpose code snippets. ''(You can test your code in http://www.lua.org/demo.html)'' = Mathematical Snippets = === G…'

New page

{{CatUp|Common Code Snippets}}
This page contains general purpose code snippets.

''(You can test your code in http://www.lua.org/demo.html)''

= Mathematical Snippets =

=== Generating Pseudo-Random Numbers ===

<syntaxhighlight lang="lua">
math.random( 3, 9 ) -- Generates a random integer between 3 and 9 inclusively.
math.Rand( 3, 9 ) -- Generates a random real number (floating point) between 3 and 9 inclusively.
</syntaxhighlight>

=== Better Rounding ===
* This allows you to round to a decimal point instead of to a whole number.
<syntaxhighlight lang="lua">
-- Rounds to the 2nd decimal point
-- Usage: math.AdvRound( 1.6443132, 2 );
--
function math.AdvRound( val, d )
d = d or 0;

return math.Round( val * (10 ^ d) ) / (10 ^ d);
end
</syntaxhighlight>

=== Toggling a Boolean ===

<syntaxhighlight lang="lua">
local Boolean = false
-- Toggle the boolean.
Boolean = not Boolean
-- or, in C-style notation:
Boolean = !Boolean
</syntaxhighlight>

= Variables =
=== Defining Multiple Variables ===

<syntaxhighlight lang="lua">
-- X = 1, Y = 2, Z = 3.
local X, Y, Z = 1, 2, 3
</syntaxhighlight>

=== Using OR ===

<syntaxhighlight lang="lua">
-- If Y is non-nil, set X to Y; otherwise, set X to 0.
local X = Y or 0
</syntaxhighlight>

=== Switching Two Variables without Making a Third ===

<syntaxhighlight lang="lua">
a,b = b,a
</syntaxhighlight>

= Loops and statements =

=== Looping through Every Character in a String ===

<syntaxhighlight lang="lua">
for i = 1, string.len( strToLoop ) do
local Character = string.sub( strToLoop, i, i )
-- Do stuff with Character here.
end
</syntaxhighlight>

=== Using 'repeat, until' ===

<syntaxhighlight lang="lua">
repeat
num = math.random( 200 )
Msg( num .. "\n" )
until( num == 25 )
</syntaxhighlight>

=== Doing 'if .. then ... else' in One Line ===

<syntaxhighlight lang="lua">
local value = ( x > 1 ) && "X is greater" || "X isn't greater";
--and in STD. Lua notation:
local value = ( x > 1 ) and "X is greater" or "X isn't greater";
--basic format for Inline Conditionals:
local value = (Condition) and TrueValue or FalseValue;
</syntaxhighlight>

=== Returning 'if .. then ... else' ===

<syntaxhighlight lang="lua">
return current < max and func( current + 1, max ) or nil
</syntaxhighlight>

= Miscellaneous =
=== Convert XYToRelative (by Cazomino05) ===

Converts an XY co-ordinate to a relative size requires the resolution you tested it on (you can find it in gta display settings)
<syntaxhighlight lang="lua">

function ConvertXYToRelative(Resx, Resy, x, y)
local Rx = (1/Resx)*x
local Ry = (1/Resy)*y
return Rx,Ry
end

-- EXAMPLE
function ResourceStarted(resource)
if (resource ~= getThisResource()) then
return
end
local x,y = ConvertXYToRelative(800, 600, 400, 300)
outputChatBox("Relative sizes: "..x..", "..y)
end
addEventHandler("onResourceStart", getRootElement(), ResourceStarted)
</syntaxhighlight>

Code Snippets General - Revision history

FileEX at 10:47, 13 July 2024

Chumillas at 11:34, 14 July 2010

Chumillas: Created page with '{{CatUp|Common Code Snippets}} This page contains general purpose code snippets. ''(You can test your code in http://www.lua.org/demo.html)'' = Mathematical Snippets = === G…'