CC test rotate toy

local tArg = {...}
local filename = tArg[1]

getPicDetails = function(picture)
    local top, bottom, left, right
    for a = 1, #picture do
        if #picture[a] > 0 then
            top = a
            break
        end
    end
    for a = 1, #picture do
        if #picture[#picture-(a-1)] > 0 then
            bottom = #picture-(a-1)
            break
        end
    end
    left, right = 10000, 0
    for a = 1, #picture do
        for b = 1, #picture[a] do
            if picture[a][b] then
                if picture[a][b] ~= 0 then
                    if b < left then
                        left = b
                    end
                    if b > right then
                        right = b
                    end
                end
            end
        end
    end
    return top, bottom, left, right, math.floor((left+right)/2), math.floor((bottom+top)/2)
end

skewImage = function(pic,xrotate,yrotate,cenX,cenY) --0 is normal
    local newPic = {}
    local picTop,picBot,picLeft,picRight,centerX,centerY = getPicDetails(pic)
    centerX = cenX or centerX
    centerY = cenY or centerY
    for y = 1, #pic do
        if pic[y] then
            newPic[math.floor(((y)*math.cos(yrotate or 0))+centerY)] = {}
            for x = 1, #pic[y] do
                if pic[y][x] then
                    newPic[math.floor(((y)*math.cos(yrotate or 0))+centerY)][math.floor(((x)*math.cos(xrotate or 0))+centerX)] = pic[y][x]
                end
            end
        end
    end
    return newPic
end

if not filename then
    return print(fs.getName(shell.getRunningProgram()).." <nfp file>")
end
paint = paintutils.loadImage(filename)

term.setBackgroundColor(colors.black)
term.clear()

local scr_x, scr_y = term.getSize()

while true do
    for a = 1, 360 do
        local pickcher = skewImage(paint,a,0)
        paintutils.drawImage(pickcher,scr_x/2,scr_y/2)
        sleep(0.1)
        term.setBackgroundColor(colors.black)
        term.clear()
    end
end