gui-lib-carrot

local MONITOR = nil

function setMonitor(mon)
    MONITOR = mon
end

function getMonitor()
    return MONITOR
end

function string.jsub(str, startIndex, endIndex)
    if (endIndex == nil) then
        endIndex = string.len(str) + 1
    end

    return string.sub(str, startIndex, endIndex - 1)
end

function drawText(x, y, text, foreground, background)
    MONITOR.setCursorPos(x, y)
    if (foreground ~= nil) then
        MONITOR.setTextColor(foreground)
    end
    if (background ~= nil) then
        MONITOR.setBackgroundColor(background)
    end

    MONITOR.write(text)
end

function drawBox(x, y, w, h, background, character)
    if (background ~= nil) then
        MONITOR.setBackgroundColor(background)
        MONITOR.setTextColor(background)
    end

    if (character == nil) then
        character = " "
    end

    local y2 = y + h - 1
    for i = y, y2 do
        MONITOR.setCursorPos(x, i)
        MONITOR.write(string.rep(character, w))
    end
end

function drawRect2d(x1, y1, x2, y2, background, character)
    if (background ~= nil) then
        MONITOR.setBackgroundColor(background)
        MONITOR.setTextColor(background)
    end

    if (character == nil) then
        character = " "
    end

    local w = x2 - x1 + 1
    for y = y1, y2 do
        MONITOR.setCursorPos(x1, y)
        MONITOR.write(string.rep(character, w))
    end
end

-- Draws a vertical line at the given x and y coords, with the given height, in the given colour
function drawLineV(x, y, h, background, character)
    if (background ~= nil) then
        MONITOR.setBackgroundColor(background)
        MONITOR.setTextColor(background)
    end

    if (character == nil) then
        character = " "
    end

    for i = y, h do
        MONITOR.setCursorPos(x, i)
        MONITOR.write(character)
    end
end

function drawLineH(x, y, w, background, character)
    if (character == nil) then
        character = " "
    end

    drawText(x, y, string.rep(character, w), background, background)
end

function drawProgressBar(x, y, w, h, min, max, val, foreground, background)
    drawBox(x, y, w, h, background)
    drawBox(x, y, math.floor((val / (max - min)) * w), h, foreground)
end

function clearMonitor()
    MONITOR.setBackgroundColor(colours.black)
    MONITOR.setTextColor(colours.white)
    MONITOR.clear()
end

function drawButton(btn, text, textColour, background)
    local x = btn.x1
    local y = btn.y1
    drawRect2d(x, y, btn.x2, btn.y2, background)
    local len = string.len(text)
    if (len < 1) then
        return
    end

    local w = btn.x2 - btn.x1 + 1
    local h = btn.y2 - btn.y1 + 1
    local cX = math.floor(w / 2) - math.floor(len / 2)
    local cY = math.ceil(h / 2)
    drawText(cX, cY, text, textColour, background)
end