Teverse: basic camera with axel

--Title: Basic Camera with Axel
--By: utrain
--Description: Allows for basic camera movements
--It uses bindKeyToPressed from this repo: https://github.com/u-train/utilityKeyBindfunctions-Teverse/blob/master/bindUtility.lua
--However, it has been pasted since require isn't available for scripts on the machine on verison 0.19.0.
--Intended to work on a Teverse environment on 0.19.0

local function bindKeyToPressed(keyName, functionOnPressed, functionOnRelease)
    --Make sure the function doesn't error because of missing table field; give best feedback.
    assert(keyName, "keyName argument is nil.")
    local enumKey = enums.key[keyName]

    assert(enumKey, "keyName is not a vaild argument.")
    assert(type(functionOnPressed) == "function", "functionOnPressed is not a vaild argument.")

    --functionOnRelease is an optional argument
    if functionOnRelease then
        assert(type(functionOnRelease) == "function", "functionOnRelease is not a vaild argument.")
     end

    local debounce = false

    local onKeyPressConnection = engine.input:on("keyPressed", function(inputObject)
        if debounce then return end
        if inputObject.key == enumKey then
            debounce = true

            functionOnPressed(inputObject)
         end
    end)

    local onKeyReleaseConnection = engine.input:on("keyReleased", function(inputObject)
        if not debounce then return end
        if inputObject.key == enumKey then
            debounce = false

            if functionOnRelease then
                functionOnRelease(inputObject)
            end
        end
    end)

    --listOfDeconstructor
    return function()
        onKeyPressConnection:disconnect()
        onKeyPressConnection = nil

        onKeyReleaseConnection:disconnect()
        onKeyReleaseConnection = nil
    end
end

--Objects
--The axel of life.
local Center;
local Blocks = {};
do
    Blocks[1] = engine.construct("block", engine.workspace, {
        position = vector3(0,0,0);
        size = vector3(2,0.1,0.1);
        colour = colour(1,0,0);
    })

    Blocks[2] = engine.construct("block", engine.workspace, {
        position = vector3(0,0,0);
        size = vector3(0.1,2,0.1);
        colour = colour(0,1,0);
    })

    Blocks[3]  = engine.construct("block", engine.workspace, {
        position = vector3(0,0,0);
        size = vector3(0.1,0.1,2);
        colour = colour(0,0,1);
    })

    Center = engine.construct("block", engine.workspace, {
        position = vector3(0,0,0);
        size = vector3(0.1,0.1,0.1);
        opacity = 0;
    })
end

--Textbox informing player of coordinates
local CoordinateBox = engine.construct("guiTextBox", engine.interface, {
    size = guiCoord(1, 0, 0, 25);
    textColour = colour(0, 0, 0);
})

local camera = engine.workspace.camera

--Stores the deconstructors for the binds.
local listOfDeconstructor = {}

--Whenever camera positions moves, it will run this.
local function Update()
    camera:lookAt(Center.position)
    CoordinateBox.text = ("Position: %s, %s, %s; press 'C' to clear everything."):format(camera.position.x, camera.position.y, camera.position.z)
end

--Start it.
camera.position = vector3(2, 2, 2)
Update()

--All of the hotkeys.
listOfDeconstructor[#listOfDeconstructor + 1] = bindKeyToPressed("d", function()
    camera.position = vector3(camera.position.x + 0.5, camera.position.y, camera.position.z)
    Update()
end)
listOfDeconstructor[#listOfDeconstructor + 1] = bindKeyToPressed("a", function()
    camera.position = vector3(camera.position.x - 0.5, camera.position.y, camera.position.z)
    Update()
end)
listOfDeconstructor[#listOfDeconstructor + 1] = bindKeyToPressed("w", function()
    camera.position = vector3(camera.position.x, camera.position.y, camera.position.z + 0.5)
    Update()
end)
listOfDeconstructor[#listOfDeconstructor + 1] = bindKeyToPressed("s", function()
    camera.position = vector3(camera.position.x, camera.position.y, camera.position.z - 0.5)
    Update()
end)
listOfDeconstructor[#listOfDeconstructor + 1] = bindKeyToPressed("q", function()
    camera.position = vector3(camera.position.x, camera.position.y + 0.5, camera.position.z )
    Update()
end)
listOfDeconstructor[#listOfDeconstructor + 1] = bindKeyToPressed("e", function()
    camera.position = vector3(camera.position.x, camera.position.y - 0.5, camera.position.z)
    Update()
end)

--To clear everything afterwards
listOfDeconstructor[#listOfDeconstructor + 1] = bindKeyToPressed("c", function()
    for _, deconstructors in next, listOfDeconstructor do
        deconstructors()
    end
    for _, block in next, Blocks do
        block:destroy()
    end
    Center:destroy()

    CoordinateBox:destroy()

    --Don't need to run lookAt because it is already facing 0, 0, 0
    camera.position = vector3(0, 0, 0)
end)