Inserting into tables

[Jakemason]

Yes, here is the main.lua

Code: Select all

require "player"
require "world"
require "objects"

function love.load()
	player.load()
	world.load()
	objects.load()
end

function love.draw()
	player.draw()
	objects.draw()
end

function love.update(dt)
	player.update(dt)
	objects.update()
end

[Nixola]

Could you upload a .love?

[Roland_Yonaba]

Code: Select all

function objects.update()
	x, y = love.mouse.getPosition()
	if love.keyboard.isDown("space") then objects.ball.shouldDraw = true else objects.ball.shouldDraw = false end
end

and still nothing appears :/

The key check is " " and not "space", if you want to use the space button.
See keyConstants

Code: Select all

function objects.update()
	x, y = love.mouse.getPosition()
	if love.keyboard.isDown(" ") then ... end
end

[Jakemason]

One other thing, I compressed my folder into a zip on Mac and then changed the extension to .love and it told me there was no code.

[Jakemason]

Oh and, how do I make multiple instances of said ball? All it does at the moment is appear and follow the mouse, I want it to appear and stay at the x and y position and allow me to create more balls.

[Qcode]

To make a .love on a Mac you need to open your game folder highlight all of your game's contents (main.lua ect.) right click and select compress items. Change the name from archive.zip to gamename.love. Then that should work.

[Roland_Yonaba]

Know what ? Searching on the wiki sometimes helps fixing most of your problems by your own.

One other thing, I compressed my folder into a zip on Mac and then changed the extension to .love and it told me there was no code.

See Game_distribution.
Don't try to zip the project folder, but its contents. So that when you open the zip file, you should directly see main.lua, conf.lua, etc.

Oh and, how do I make multiple instances of said ball?

That's a game logic issue.
You just have to create multiple balls. Populate your objects table.
Then loop through the table to display them.

Code: Select all

function love.load()
   objects = {}
   objects.balls = {}
   for i =  1,10 do
      objects.balls[i] = {x = ..., y = ..., shouldDraw = true}
   end
   objects.ballImage = love.graphics.newImage(...)
end

...

function love.draw()
   ...
   for i,ball in ipairs(objects.balls) do
      if ball.shouldDraw then love.graphics.draw(objects.ballImage, ball.x, ball.y) end
   end
   ...
end
...

But have to fully understand how tables and control structures works in Lua.
You will find nice materials reading PiL: at least tables, Numeric for, Arrays, Multidimensional arrays chapters.

All it does at the moment is appear and follow the mouse, I want it to appear and stay at the x and y position and allow me to create more balls.

That is because you used love.keyboard.isDown, meaning "as long as a certain key is down".
Maybe what you need is using callbacks.
See love.keypressed and love.keyreleased, and try to mix them with the base code provided before. Shouldn't be that hard to have it working.

[Jakemason]

Ok, so after reading through the resources you kindly suggested I understand the concepts better. I am now able to place the ball at my mouse cursor and keep it there until the next time I click, but I haven't got it down how multiple objects works, so if anyone could help with that that would be great

Code: Select all

ball = {}
ball.x = 0 - 25
ball.y = 0 - 25
ball.alive = false

function ball.load()
	ball.image = love.graphics.newImage("images/ball.png")
end

function ball.draw()
	if ball.alive == true then
		for i,v in pairs(ball) do
			love.graphics.draw(ball.image,ball.x,ball.y)
		end
	end
end

function ball.update()
	
end

function love.mousepressed(x, y, button)
	if button == "l" then
		ball.x, ball.y = x -25, y -25
		ball.alive = true
	else
		ball.alive = false
	end
end

[Roland_Yonaba]

[...]but I haven't got it down how multiple objects works, so if anyone could help with that that would be great

Fair enough.

Code: Select all

ball = {}
ball.x = 0 - 25
ball.y = 0 - 25
ball.alive = false

...

function ball.draw()
	if ball.alive == true then
		for i,v in pairs(ball) do
			love.graphics.draw(ball.image,ball.x,ball.y)
		end
	end
end

...

You're not using pairs/ipairs the good way.
See pairs/ipairs.
Lua_tables tutorial gives also great examples.

In your implementation, each step, i and v will go through differents states:

1. i = "x", v = -25
2. i = "y", v = -25
3. i = "alive", v = false
4. i = "image", v = __userdata__

That is, just because you're looping inside table ball. Got it know ?
You have to define another table where you will list every different ball you need to create.
This second table can be placed inside the original table named ball.

This means:

Code: Select all

-- as before
ball = {}
ball.x = 0 - 25
ball.y = 0 - 25
ball.balls = {} -- will hold all my new balls

-- So that you can populate it this way.
ball.balls[1] = { x = .., y = ..., alive = false}
ball.balls[2] = { x = .., y = ..., alive = false}
ball.balls[3] = { x = .., y = ..., alive = false}
...

As you like.

Then looping on table ball.balls outputs:

Code: Select all

for i,thisBall in ipairs(ball.balls) do
   if thisBall.alive then love.graphics.draw(ball.image,thisBall.x,thisBall.y)
end

Next time, please provide a *.love file.

[Jakemason]

Thanks for that

So is this the idea?

Code: Select all

ball = {}
ball.balls = {}
ball.x = 0 
ball.y = 0 
ball.alive = false

function ball.load()
	ball.image = love.graphics.newImage("images/ball.png")
end

function ball.draw()
	for i,v in ipairs(ball.balls) do
   		if ball.alive then 
   			table.insert(ball.balls[i]{x = ball.x, y = ball.y})
   			love.graphics.draw(ball.image,x,y)
   		end
   	end
end

function ball.update()
	
end

function love.mousepressed(x, y, button)
	if button == "l" then
		ball.x, ball.y = x -25, y -25
		ball.alive = true
	else
		ball.alive = false
	end
end