mystCraft_PortalComputer

TURTLE = 96;
Data = {
    {
        name = "Plant",
        slot = 2,
        color = colors.cyan,
    },
    {
        name = "Factory",
        slot = 3,
        color = colors.lightGray,
    },
    {
        name = "MtFluff",
        slot = 4,
        color = colors.lightBlue,
    },
    {
        name = "Tree",
        slot = 5,
        color = colors.green,
    },
};

rednet.open("top");
monitor = peripheral.wrap("back");
monitor.clear();

SelectedIndex = 0;

function write(text, x, y, fc, bc)
    fc = fc or colors.white;
    bc = bc or colors.black;
    x = x or 1;
    y = y or 1;

    monitor.setCursorPos(x, y);
    monitor.setBackgroundColor(bc);
    monitor.setTextColor(fc);
    monitor.write(text);
end

function getCenteredOffset(text)
    local width = monitor.getSize();
    return math.floor((width - #text) / 2) + 1;
end

function getButtonOffset()
    local width, height = monitor.getSize();
    return (height - ((#Data * 4) - 1)) / 2;
end

function getHitButton(yPos)
    local yOffset = getButtonOffset();
    return math.max(1, math.floor((yPos - yOffset - 1) / 4) + 1);
end

function drawScreen()
    monitor.setBackgroundColor(colors.black);
    monitor.clear();

    local width, height = monitor.getSize();
    local yOffset = getButtonOffset();

    for i = 1, #Data do
        local button = Data[i];
        local y = ((i - 1) * 4) + 1 + yOffset;
        write(button.name, getCenteredOffset(button.name), y);

        -- draw button borders
        for j = 1, 2 do
            write(" ", 1, y + j, nil, colors.white);
            write(" ", width, y + j, nil, colors.white);

            -- highlight button
            if (i == SelectedIndex) then
                write(string.rep(" ", width - 2), 2, y + j, nil, button.color)
            end
        end
    end
end

while true do
    drawScreen();
    local event, side, x, y = os.pullEvent("monitor_touch");

    print(x, y);

    SelectedIndex = getHitButton(y);
    rednet.send(TURTLE, Data[SelectedIndex].slot);
end