--毎フレーム更新する場合は64pixelが限度
local _textureSize = 64
local _Time = 0
local _useIsActive = false

function timeCount()
    _Time = _Time + 1
    if _Time > _textureSize then
        _Time = 0
    end
end

function update()
    --Timer
    timeCount()

    -- useを押してなければ実行
    if _useIsActive == false then
        --sinでmeterを動かす
        --meterY((math.sin(os.time()) + 1) * _textureSize * 0.5 + 0.5)

        --sinで円を描く
        circle((math.sin(os.time()) + 1) * _textureSize)
    end

end

function onUse()
    _useIsActive = true
    whiteNoise()
end

function onUnuse()
    _useIsActive = false
end

function circle(radius)

    local t = ""
    for y = 1, _textureSize do
        for x = 1, _textureSize do

            local p = "□"
            local x2 = x - _textureSize / 2
            local y2 = y - _textureSize / 2
            local r = radius / 2
            if x * x + y * y < r * r then
                p = "■"
            end

            t = t..p
        end
        t = t.."\n"
    end
    vci.assets._ALL_SetText("Text", t)

end

function meterY(value)

    local t = ""
    for y = 1, _textureSize do
        for x = 1, _textureSize do

            local p = "□"
            --描く
            if (value > y) then
                p = "■"
            end

            t = t..p
        end
        t = t.."\n"
    end
    vci.assets._ALL_SetText("Text", t)

end

function meterX(value)

    local t = ""
    for y = 1, _textureSize do
        for x = 1, _textureSize do

            local p = "□"
            --描く
            if (value > x) then
                p = "■"
            end

            t = t..p
        end
        t = t.."\n"
    end
    vci.assets._ALL_SetText("Text", t)

end

function whiteNoise()

    local t = ""
    for y = 1, _textureSize do
        for x = 1, _textureSize do

            local p = "□"
            if math.random(0,1) == 0 then
                p = "■"
            end

            t = t..p
        end
        t = t.."\n"
    end
    vci.assets._ALL_SetText("Text", t)

end