A Teverse calculator app.

Teverse Calculator 20201105.lua

--[[ 
    Really cool calculator app for Teverse in 100 lines or less by dotcomboom/dcb, donut steel
]] -- UI objects
local frame = teverse.construct("guiFrame",
                                { -- Parent frame, contains all objects
    parent = teverse.interface,
    size = guiCoord(1, 0, 1, 0)
})
local topbar = teverse.construct("guiTextBox",
                                 { -- Definitely not ripped from the example
    parent = frame,
    size = guiCoord(1, 0, 0, 60),
    position = guiCoord(0, 0, 0, 0),
    backgroundColour = colour.rgb(52, 58, 64),
    text = "teverse calculator",
    textSize = 36,
    textFont = "tevurl:fonts/robotoBold.ttf",
    textColour = colour(1, 1, 1),
    textAlign = "middle",
    textShadowSize = 4,
    textShadowColour = colour(0, 0, 0),
    dropShadowAlpha = 1,
    dropShadowBlur = 2,
    dropShadowColour = colour.rgb(127, 127, 127),
    dropShadowOffset = vector2(0.5, 1)
})
local number1box = teverse.construct("guiTextBox", {
    parent = frame,
    size = guiCoord(0.3, 0, 0.0, 40),
    position = guiCoord(0, 16, 0, 76),
    text = "0",
    textSize = 36,
    textFont = "tevurl:fonts/firaCodeRegular.otf",
    textEditable = true,
    dropShadowAlpha = 1,
    dropShadowBlur = 2,
    dropShadowColour = colour.rgb(127, 127, 127),
    dropShadowOffset = vector2(0.5, 1)
})
local number2box = teverse.construct("guiTextBox", {
    parent = frame,
    size = guiCoord(0.3, 0, 0.0, 40),
    position = guiCoord(0, 16, 0, 122),
    text = "0",
    textSize = 36,
    textFont = "tevurl:fonts/firaCodeRegular.otf",
    textEditable = true,
    dropShadowAlpha = 1,
    dropShadowBlur = 2,
    dropShadowColour = colour.rgb(127, 127, 127),
    dropShadowOffset = vector2(0.5, 1)
})
local results = teverse.construct("guiTextBox", {
    parent = frame,
    size = guiCoord(0.7, -48, 1, -130),
    position = guiCoord(0.3, 32, 0, 76),
    textSize = 36,
    textFont = "tevurl:fonts/firaCodeRegular.otf",
    textMultiline = true,
    textAlign = enums.align.topRight,
    textWrap = true,
    dropShadowAlpha = 1,
    dropShadowBlur = 2,
    dropShadowColour = colour.rgb(127, 127, 127),
    dropShadowOffset = vector2(0.5, 1),
    active = false
})
-- Functionality
function scale() -- Some delicious, homegrown text-scaling
    while (results.textDimensions.y < results.absoluteSize.y and
        results.textSize < 36) do
        results.textSize = results.textSize + 1 -- Increase font size until text height is larger than the textbox's height
    end
    while results.textDimensions.y > results.absoluteSize.y do
        results.textSize = results.textSize - 1 -- Decrease font size until text height fits in the textbox
    end
end
function calc() -- Do the calculations
    local x = tonumber(number1box.text)
    local y = tonumber(number2box.text)
    -- (Note: these will crash the function if the text is alphanumeric)
    -- (Fortunately, that doesn't crash the app or anything soo)

    local add = string.format("%s + %s = %s\n", x, y, x + y)
    local subtract = string.format("%s - %s = %s\n", x, y, x - y)
    local multiply = string.format("%s * %s = %s\n", x, y, x * y)
    local divide = string.format("%s / %s = %s\n", x, y, x / y)
    local modulo = string.format("%s %% %s = %s\n", x, y, x % y)
    local exponent = string.format("%s ^ %s = %s\n", x, y, x ^ y)
    -- The above perform the calculations and make them into nicely formatted strings

    results.text = add .. subtract .. multiply .. divide .. "\n" .. modulo ..
                       exponent
    -- This just adds them all together; modulo and exponent aren't the basic operators so another newline's added for cosmetic effect

    scale()
    -- Run that scaling function so the text all fits
end
number1box:on("keyUp", calc) -- Calculate function is ran when a key is no longer being pressed
number2box:on("keyUp", calc)
teverse.input:on("screenResized", scale) -- Scale text to fit when the screen is resized
calc() -- Run the first calculation with 0 and 0

Screenshot of it in use:

(this was taken in 2020, I don't know when/if Teverse is going online again)