main.lua

function love.load()
    startDepth = 1 
    spaceDiv = 2
    depthMult = 30
    font = love.graphics.getFont()
end 

function love.update(dt)
    startMid = love.window.getWidth()/2
    startSpace = startMid/2 
    tree = getTree() -- loads 'test.lua'
end 

function love.draw()
    printTree(tree, startMid, startDepth, startSpace)
end

function printTree(node, mid, depth, space)
    if node then 
        if node.left then 
            printTree(node.left, mid-space, depth+1, space/spaceDiv) -- print the left
            love.graphics.setColor(0,0,255)
            love.graphics.line(mid, depth*depthMult, mid-space, (depth+1)*depthMult) -- draw a blue line to the left
        end 
        if node.right then
            printTree(node.right, mid+space, depth+1, space/spaceDiv) -- print the right
            love.graphics.setColor(255,0,0)
            love.graphics.line(mid, depth*depthMult, mid+space, (depth+1)*depthMult) -- draw a red line to the right
        end
        love.graphics.setColor(255,255,255) -- reset to white for each node
        if node.key then 
            kw = font:getWidth(node.key)/2 -- for sexy not-offset printing
            dw = font:getWidth(node.data)/2
            love.graphics.print(node.key, mid-kw, depth*depthMult) -- prints last so that its over the line behind it
            love.graphics.print(node.data, mid-dw, depth*depthMult+10)
        end
    end
end

function getTree() 
    chunk = love.filesystem.load("test.lua")
    if chunk then 
        return chunk()
    else 
        return {}
    end
end