時計

時計1

# include <Siv3D.hpp>

void Main()
{
    Graphics::SetBackground(Palette::Seagreen);

    const Font font(45, Typeface::Light);

    // 時計盤の中心
    const Vec2 center(320, 210);

    while (System::Update())
    {
        Circle(center, 8).draw();

        for (auto i : step(12))
        {
            Circle(center + Circular(170, Radians(i * 30)), i % 3 ? 10 : 15).draw();
        }

        // 現在時刻
        const DateTime time = DateTime::Now();

        // 時針
        const double hourRadian = (time.hour*60.0 + time.minute) / 720.0 * TwoPi;
        Line(center, center + Circular(120, hourRadian)).draw(12);

        // 分針
        const double minuteRadian = time.minute / 60.0 * TwoPi;
        Line(center, center + Circular(160, minuteRadian)).draw(8);

        // 秒針
        const double secondRadian = time.second / 60.0 * TwoPi;
        Line(center, center + Circular(170, secondRadian)).draw(2);

        font(time.format(L"HH:mm")).drawCenter(390);
    }
}

時計2

文字色の反転 も使っています。

# include <Siv3D.hpp>

void Main()
{
    Graphics::SetBackground(Palette::White);

    const Font font(45, Typeface::Light);

    const Vec2 center = Window::Center();

    while (System::Update())
    {
        const DateTime time = DateTime::Now();

        const int32 ms = (time.hour * 60 * 60 * 1000) + (time.minute * 60 * 1000) + (time.second * 1000 + time.milliseconds);

        const double h = (ms % (12 * 60 * 60 * 1000)) / (12 * 60.0 * 60.0 * 1000.0)*TwoPi;

        const double m = (ms % (60 * 60 * 1000)) / (60.0 * 60.0 * 1000.0)*TwoPi;

        const double s = (ms % (60 * 1000)) / (60.0 * 1000.0)*TwoPi;

        Graphics2D::SetStencilState(StencilState::None);

        Circle(center, 400).drawArc(s + 0.05, TwoPi - 0.1, 240.5, 0.0, Color(40, 150, 255));

        Circle(center, 160).drawArc(m + 0.05, TwoPi - 0.1, 80.5, 0.0, Color(40, 120, 220));

        Circle(center, 80).drawArc(h + 0.05, TwoPi - 0.1, 60.5, 0.0, Color(40, 90, 180));

        Graphics2D::SetStencilValue(1);

        Graphics2D::SetStencilState(StencilState::Replace);

        Circle(center, 400).drawArc(s + 0.05, TwoPi - 0.1, 240.5, 0.0);

        Graphics2D::SetStencilState(StencilState::Test(StencilFunc::NotEqual));

        font(time.format(L"HH:mm")).drawCenter(390, Color(40, 150, 255));

        Graphics2D::SetStencilState(StencilState::Test(StencilFunc::Equal));

        font(time.format(L"HH:mm")).drawCenter(390);
    }
}