NFT API

local tchar, bchar = string.char(31), string.char(30)

loadImageData = function(image, background) --string image
    image = image:lower()
    local output = {{},{},{}} --char, text, back
    local y = 1
    local text, back = " ", background or " "
    local doSkip, c1, c2 = false
    for i = 1, #image do
        if doSkip then
            doSkip = false
        else
            output[1][y] = output[1][y] or ""
            output[2][y] = output[2][y] or ""
            output[3][y] = output[3][y] or ""
            c1, c2 = image:sub(i,i), image:sub(i+1,i+1)
            if c1 == tchar then
                text = c2
                doSkip = true
            elseif c1 == bchar then
                back = c2
                doSkip = true
            elseif c1 == "\n" then
                y = y + 1
                text, back = " ", background or " "
            else
                output[1][y] = output[1][y]..c1
                output[2][y] = output[2][y]..text
                output[3][y] = output[3][y]..back
            end
        end
    end
    return output
end

loadImage = function(path, background)
    local file = fs.open(path,"r")
    local output = loadImageData(file.readAll(), background)
    file.close()
    return output
end

unloadImage = function(image)
    local output = ""
    local text, back = " ", " "
    local c, t, b
    for y = 1, #image[1] do
        for x = 1, #image[1][y] do
            c, t, b = image[1][y]:sub(x,x), image[2][y]:sub(x,x), image[3][y]:sub(x,x)
            if (t ~= text) or (x + y == 2) then output = output..tchar..t end
            if (b ~= back) or (x + y == 2) then output = output..bchar..b end
            output = output..c
        end
        if y ~= #image[1] then
            output = output.."\n"
            text, back = " ", " "
        end
    end
    return output
end

drawImage = function(image, x, y)
    local cx, cy = term.getCursorPos()
    for iy = 1, #image[1] do
        term.setCursorPos(x,y+(iy-1))
        term.blit(image[1][iy], image[2][iy], image[3][iy])
    end
    term.setCursorPos(cx,cy)
end

drawImageTransparent = function(image, x, y)
    local cx, cy = term.getCursorPos()
    local c, t, b
    for iy = 1, #image[1] do
        for ix = 1, #image[1][iy] do
            c, t, b = image[1][iy]:sub(ix,ix), image[2][iy]:sub(ix,ix), image[3][iy]:sub(ix,ix)
            if (b ~= " ") or (c ~= " ") then
                term.setCursorPos(x+(ix-1),y+(iy-1))
                term.blit(c, t, b)
            end
        end
    end
    term.setCursorPos(cx,cy)
end