is it possible to use grid with newWorld and love.body

[kingslovelua]

Hello I'm playing around with Lua/Love2D and I want to know if it's possible to Use a grid and love.body together. I wanted to make and test out grids and I also want to make a world = love.physics.newWorld to set the gravity 0, 0 and use love.body:applyForce to give it a space like feeling.


So right now I have player

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     player = {}
      	player.gridx = 64
 	player.gridy = 64
	player.acty = 200
	player.speed = 32
 

Because I'm using grid but I would also like add

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	world = love.physics.newWorld(0, 0, true)

       In   love.load()

And then in player class

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   player = {}
      player.body = love.physics.newBody(world, 200, 550, "dynamic")
      player.body:setMass(100) -- make it pretty light
      player.shape = love.physics.newRectangleShape(0, 0, 30, 15)
      player.fixture = love.physics.newFixture(player.body, player.shape, 2) 
      player.fixture:setRestitution(0.4)    -- make it bouncy

and then use

Code: Select all

     if love.keyboard.isDown("right") then
          player.body:applyForce(10, 0.0)
          print("moving right")
     elseif love.keyboard.isDown("left") then
          player.body:applyForce(-10, 0.0)
          print("moving left")
     end
    if love.keyboard.isDown("up") then
       player.body:applyForce(0, -500)
    elseif love.keyboard.isDown("down") then
        player.body:applyForce(0, 100)
    end

Instead of

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      function love.keypressed(key)

      if key == "up" then
        if testMap(0, -1) then
            player.gridy = player.gridy - 32
        end
     elseif key == "down" then
        if testMap(0, 1) then
            player.gridy = player.gridy + 32
         end
       elseif key == "left" then
        if testMap(-1, 0) then
            player.gridx = player.gridx - 32
        end
      elseif key == "right" then
        if testMap(1, 0) then
            player.gridx = player.gridx + 32
        end
      end
     end

enter code here

[Roland_Yonaba]

The forum etiquette, in point 9, advises using the right

Code: Select all

 tags when posting.
Not those <code> and </code>.
Please fix that.  :awesome:

[Robin]

Hello I'm playing around with Lua/Love2D and I want to know if it's possible to Use a grid and love.body together.

You can, but it's really awkward and depending on what exactly you want, there's going to be a better way.

[davisdude]

Hi! Welcome to LÖVE!

To make it fixed to certain points, just use math.floor and some numbers.
For example:

Code: Select all

function bindToGrid( x, y, number )
    return ( math.floor( x / number ) * number ), ( math.floor( y /  number ) * number )
end

Note that math.floor would round down (lower it). If you wanted to go higher, use math.ceil.

[kingslovelua]

Hello I'm playing around with Lua/Love2D and I want to know if it's possible to Use a grid and love.body together.

You can, but it's really awkward and depending on what exactly you want, there's going to be a better way.

yeah I figured it would seem weird to most, but I just wanted the ease of altering a map/ stage/ grid by just adding 111100011010 but still have the ability to add and use love.body features and adding love.physics.newWorld(0, 0, true) for a space like feeling when moving around.

also

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if love.keyboard.isDown("right") then
       player.body:applyForce(10, 0.0)
	   print("moving right")
    elseif love.keyboard.isDown("left") then
			player.body:applyForce(-10, 0.0)
			print("moving left")
		end
		if love.keyboard.isDown("up") then
			player.body:applyForce(0, -500)
		elseif love.keyboard.isDown("down") then
			player.body:applyForce(0, 100)
    end

seems to be a smoother then

Code: Select all

function love.keypressed(key)

    if key == "up" then
        if testMap(0, -1) then
            player.gridy = player.gridy - 32
        end
    elseif key == "down" then
        if testMap(0, 1) then
            player.gridy = player.gridy + 32
        end
    elseif key == "left" then
        if testMap(-1, 0) then
            player.gridx = player.gridx - 32
        end
    elseif key == "right" then
        if testMap(1, 0) then
            player.gridx = player.gridx + 32
        end
    end
end

I put my old version of my game in the attachment this version doesn't use a map just basic old school making solid walls technique. which works great just that I just learn how to make a grid and want to see if I can integrate grids and love.body.

Hi! Welcome to LÖVE!

To make it fixed to certain points, just use math.floor and some numbers.
For example:

Code: Select all

function bindToGrid( x, y, number )
    return ( math.floor( x / number ) * number ), ( math.floor( y /  number ) * number )
end

Note that math.floor would round down (lower it). If you wanted to go higher, use math.ceil.

I'm new to making maps/grids so I 'm not sure where I would put this code to see if it will work for me. I learned about grids here https://love2d.org/wiki/Tutorial:Gridlocked_Player

[davisdude]

Code: Select all

function love.keypressed(key)

    if key == "up" then
        if testMap(0, -1) then
            player.gridy = player.gridy - 32
        end
    etc.

Right after this part. Just do

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if key == "up" then
        if testMap(0, -1) then
            player.newy= player.gridy - 32
        end
etc.

Then at the end of the if-elseif-else bit put

Code: Select all

player.gridx, player.gridy = bindToGrid( player.newx, player.newy, 32 )

It doesn't have to be 32, it can be anything that you want to bind it to the grid with.