Raycasting API Demo

os.unloadAPI(shell.resolve("ray"))
os.loadAPI(shell.resolve("ray"))

term.clear()
term.setCursorPos(1, 1)

local Raycaster = ray.newRaycaster(1, 1)
Raycaster:loadFromFile(shell.resolve("demoMap"))
Raycaster:setSkyColour(colours.lightGrey)
Raycaster:setWallHeight(1.2)
Raycaster:setCameraTransform(3, 5, 0)

local renderFunc = Raycaster.draw3D

local function toggleView()
    if renderFunc == Raycaster.draw3D then
        renderFunc = Raycaster.draw2D
    else
        renderFunc = Raycaster.draw3D
    end
end

os.queueEvent("key")

while true do
    local e, key = os.pullEvent("key")
    term.setBackgroundColour(colours.black)
    term.clear()
    term.setCursorPos(1, 1)

    local x, y, angle = Raycaster:getCameraTransform()
    if key == keys.right then
        Raycaster:setCameraTransform(x, y, angle + 5)
    elseif key == keys.left then
        Raycaster:setCameraTransform(x, y, angle - 5)
    end

    if key == keys.up then
        local nextX, nextY = x + math.cos(math.rad(angle)), y + math.sin(math.rad(angle))

        if Raycaster:getTile(nextX, nextY) == 0 then
            Raycaster:setCameraTransform(nextX, nextY, angle)
        end
    elseif key == keys.down then
        local nextX, nextY = x - math.cos(math.rad(angle)), y - math.sin(math.rad(angle))

        if Raycaster:getTile(nextX, nextY) == 0 then
            Raycaster:setCameraTransform(nextX, nextY, angle)
        end
    end

    if key == keys.space then
        toggleView()
    end

    renderFunc(Raycaster, term)
end