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running a function only once
Posted: Fri Aug 22, 2014 1:10 pm
by silverknight108
hello all you i need to run a function only once for a pathfinding test.The game works by genarating obstacles for my pathfinder but it genarates a map like10 times every second. Here's my code
Code: Select all
function love.load()
function dg()
h,w = love.window.getHeight,love.window.getWidth
for i = 0,12 do
for h = 0,12 do
t = love.math.random(1,2)
if t == 1 then
love.graphics.rectangle("line",i*45,h*45,45,45)
else
love.graphics.rectangle("fill",i*45,h*45,45,45)
end
end
end
end
end
function love.update()
end
function love.draw()
gen = true
if gen == true then
gen = false
dg()
end
end
Re: running a function only once
Posted: Fri Aug 22, 2014 1:52 pm
by clofresh
You're setting gen = true at the beginning of the love.draw function so the if statement will always pass and call dg. I think what you want to do is to generate the rectangles in love.load and save them to tables, then just draw those rectangles in the draw function.
Re: running a function only once
Posted: Fri Aug 22, 2014 1:56 pm
by silverknight108
what example please
Re: running a function only once
Posted: Fri Aug 22, 2014 2:12 pm
by Plu
The most straightforward example possible. (You can probably do this much cleaner.)
On loading; make the line/fill variables and stuff them in a table. When drawing, reload the line/fill from the table and use it to draw each block.
If you don't understand what is happening, let me know I'll explain more.
(Like everything I post; untested function. If it gives an error, try to solve it yourself as it's probably just a typo)
Code: Select all
function love.load()
blocks = {}
makeBlocks()
end
function makeBlocks()
h,w = love.window.getHeight,love.window.getWidth
for i = 0,12 do
blocks[i] = {}
for h = 0,12 do
t = love.math.random(1,2)
if t == 1 then
love.graphics.rectangle("line",i*45,h*45,45,45)
blocks[i][h] = "line";
else
love.graphics.rectangle("fill",i*45,h*45,45,45)
blocks[i][h] = "fill";
end
end
end
end
function drawBlocks()
h,w = love.window.getHeight,love.window.getWidth
for i = 0,12 do
for h = 0,12 do
love.graphics.rectangle(blocks[i][h],i*45,h*45,45,45)
end
end
end
function love.update()
end
function love.draw()
drawBlocks()
end
Re: running a function only once
Posted: Fri Aug 22, 2014 2:19 pm
by silverknight108
does it rely on the system time cause when i ran it twice it put the same maze
Re: running a function only once
Posted: Fri Aug 22, 2014 2:26 pm
by Plu
It should automatically seed the randomiser and generate a different one each time.
Re: running a function only once
Posted: Sat Aug 23, 2014 5:55 pm
by Inny
Code: Select all
function only_run_once(func)
return function(...)
if func then
local f = func
func = nil
return f(...)
end
end
end
my_function = only_run_once(function(...) return do_stuff(...) end)
We really need a lodash library for Lua.
Re: running a function only once
Posted: Sun Aug 24, 2014 11:19 am
by Roland_Yonaba
Inny wrote:We really need a lodash library for Lua.
Would
moses be a good candidate for that ?
Re: running a function only once
Posted: Sun Aug 24, 2014 3:48 pm
by Inny
Roland_Yonaba wrote:Inny wrote:We really need a lodash library for Lua.
Would
moses be a good candidate for that ?
I like what I see, except for this:
Code: Select all
function _.once(f)
local _internal = 0
local _args = {}
return function(...)
_internal = _internal+1
if _internal<=1 then _args = {...} end
return f(unpack(_args))
end
end
This will run the function every time it's called with the arguments from the first call. This doesn't "only run the function once".
Re: running a function only once
Posted: Sun Aug 24, 2014 7:10 pm
by Roland_Yonaba
Inny wrote:This will run the function every time it's called with the arguments from the first call. This doesn't "only run the function once".
Well, that was intended.
Moses was kind of inspired by
Underscore.js library, at first, where
_.once is implemented as a function for lazy initialization. Hence the actual Lua implementation. I do admit the name _.once is a bit misleading, though.
