文字色の反転

# include <Siv3D.hpp>

void Main()
{
    const Font font(70, Typeface::Light);

    const Color color(40, 120, 220);

    Graphics::SetBackground(Palette::White);

    while (System::Update())
    {
        const Circle circle(Mouse::Pos(), 80);

        Graphics2D::SetStencilState(StencilState::None);

        circle.draw(color);

        Graphics2D::SetStencilValue(1);

        Graphics2D::SetStencilState(StencilState::Replace);

        circle.draw();

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

        font(L"Siv3D Engine").drawCenter(160, color);

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

        font(L"Siv3D Engine").drawCenter(160, Palette::White);
    }
}