User Define keys in a game

[tido170]

Hi all,

I'm a new lover with some but limited programming experience.
Here is my question:
How can I make the user define the keys he wants to use in the game?

More specificly, I need a line of coding for this:
detect if the key stored in a variable is pressed

I mean I would have variable = "d" and I want to check if it is press without knowing it is in fact "d" I'm looking for

thanks for your time!

[thelinx]

You can make a table called bindings or something similar:

Code: Select all

bindings = {
    [love.key_w] = goForward,
    [love.key_s] = goBack,
    [love.key_a] = steerLeft,
    [love.key_d] = steerRight -- the values are functions!
}

Note that if you're using LÖVE 0.6.0, use "w", "s", "a" and "d" instead of the constants.
Then allow the user to change those. Here's a sample function. Just pass the argument from the keypressed function to it somehow:

Code: Select all

function bind(act, key)
    bindings[key] = act
end

Then to do an action when the key is pressed:

Code: Select all

-- this goes in keypressed(key)
if bindings[key] then bindings[key]() end

Hope this will help!
(note that all code in this post is untested, you may have to screw around to get it to work)

[bartbes]

Not to mention this keeps the old bindings intact, you may want to remove the old one.

[Robin]

The code TheLinx supplied only works if goForward and his friends return a function...
You probably want to use this:

Code: Select all

bindings = {
    [love.key_w] = goForward,
    [love.key_s] = goBack,
    [love.key_a] = steerLeft,
    [love.key_d] = steerRight
}

And as bartbes pointed out, you want to clear the previous binding:

Code: Select all

function bind(act, key)
    for key,value in pairs(bindings) do
        if value == act then
            bindings[key] = nil
            break
        end
    end
    bindings[key] = act
end

[thelinx]

The code TheLinx supplied only works if goForward and his friends return a function

oops

[tido170]

Thanks all, I'm gonna try that!

and we can get 0.6? How can we get it, I only see 0.5 on the main page?

[Robin]

http://love2d.org/builds/

[tido170]

AHHH it wont work!

I know I'm doing something wrong but I tried many different things (never worked with lua so I'm just trying stuff)

Here is what I had to test this:

In Function load()

Code: Select all

	bindings = {
		[love.key_w] = Up,
		[love.key_s] = Down,
		[love.key_a] = Left,
		[love.key_d] = Right
		}
end

then

Code: Select all

function keypressed(key)
	if bindings[key] then bindings[key]() end

end

then you said right, up, down and left had to refer to a function so I did that

Code: Select all

function Right()
--whatever
end
and so...

I also tried creating a bindings function but it wont get pass the "if bindings[key] then" part.

what is wrong?

[Robin]

Could you upload the whole main.lua? I have an idea as to what went wrong, but we can't really know if we can't look at the whole source.

[tido170]

well here is my main.lua.

The condition "if bindings[key] then" just never turns out true
There isn't much more than I already gave you:

Code: Select all

function load()

	-- Includes
	love.filesystem.require("lua/button.lua")
	love.filesystem.require("lua/states.lua")

	-- Resources
	color =	 {	background = love.graphics.newColor(0,0,0),
				main = love.graphics.newColor(63,193,245),
				text = love.graphics.newColor(76,77,78),
				overlay = love.graphics.newColor(255,255,255,235) }
	font = {	default = love.graphics.newFont(love.default_font, 24),
				large = love.graphics.newFont(love.default_font, 32),
				huge = love.graphics.newFont(love.default_font, 72),
				small = love.graphics.newFont(love.default_font, 22) }
	graphics = {back_ville = love.graphics.newImage("images/back-ville.png"),
				Menu_Building = love.graphics.newImage("images/Menu-Building.png"),
				Menu_MM = love.graphics.newImage("images/Menu-MM.png")}

	-- Animation
	local cheveux = love.graphics.newImage("images/cheveux.png")
	anim_cheveux = love.graphics.newAnimation(cheveux, 21, 24, 0.08)
	
	-- Variables
	audio = true
	full = false
	device1="keyboard"
	device2="keyboard"
	device3="keyboard"
	device4="keyboard"
	bouton="kosse"
	what="kosse"
	player=2
	state = Intro.create()	-- current game state
	BackY = 200
	-- Setup
	love.graphics.setBackgroundColor(color["background"])
	
	-- Pour vérifier si il y a des joysticks
	joysticks = { }
	joystickCount = love.joystick.getNumJoysticks()
	if  joystickCount > 0 then

    for i = 0, joystickCount - 1, 1 do
        local joystick = { }
        joystick.axes = love.joystick.getNumAxes( i )
        joystick.balls = love.joystick.getNumBalls( i )
        joystick.buttons = love.joystick.getNumButtons( i )
        joystick.hats = love.joystick.getNumHats( i )
    end
	end
	
	-- User define keys
	bindings = {
		[love.key_w] = Up,
		[love.key_s] = Down,
		[love.key_a] = Left,
		[love.key_d] = Right
		}

end

function draw()
	state:draw()
end

function update(dt)
	state:update(dt)
end

function mousepressed(x, y, button)
	state:mousepressed(x,y,button)
end

function keypressed(key)
	if love.keyboard.isDown(love.key_q) then
		love.system.exit()
	end
	
	if bindings[key] then bindings[key]() end
	
	state:keypressed(key)
end

function Right()
	backy=300
end

function Left()

end

function Up()

end

function Down()

end