いろんなフェード
https://gyazo.com/2871af8fc6c80a0bf52f4dc7902a0c00
code:various_fade.cpp
#include <Siv3D.hpp> // OpenSiv3D v0.6.11 using App = SceneManager<String>;
// フェードイン・フェードアウトの描画をするクラス
struct Fade
{
virtual ~Fade() = default;
virtual void fade(double t) = 0;
};
// 1. 画面全体をフェード
struct Fade1 : public Fade
{
void fade(double t) override
{
Scene::Rect().draw(ColorF{ 0.1, EaseInCubic(t) });
}
};
// 2. 円が広がる／狭まる
struct Fade2 : public Fade
{
void fade(double t) override
{
const auto r = Scene::CenterF().distanceFrom(Vec2::Zero());
Circle{ Scene::Center(), r }.drawFrame(EaseInCubic(t) * r, 0, ColorF{ 0.1 });
}
};
// 3. くるくる
struct Fade3 : public Fade
{
void fade(double t) override
{
const auto n = 3;
const auto r0 = Scene::CenterF().distanceFrom(Vec2::Zero());
for (int i : step(n))
{
const auto r = r0 / n * (i + 1);
const auto delay = 1.0 / n * (n - 1 - i);
const auto angle = Clamp((t - delay) / (1.0 / n) * 360_deg, 0_deg, 360_deg);
Circle{ Scene::Center(), r }.drawArc(0_deg, angle, r0 / n, 2.0 /* 0だと隙間ができる */, ColorF{ 0.1 });
}
}
};
// 4. グリッド
struct Fade4 : public Fade
{
Array<int> rectPos;
const int size = 100;
const int w = Scene::Width() / size;
const int h = Scene::Height() / size;
Fade4()
{
rectPos = Iota(w * h);
Shuffle(rectPos);
}
void fade(double t) override
{
{
if (index > t * w * h) break;
const auto x = pos % w;
const auto y = pos / w;
Rect{ x * size, y * size, size }.draw(ColorF{ 0.1 });
}
}
};
// フェード描画クラスのインスタンスをランダムに返す
auto randomFade()
{
Array<std::function<std::unique_ptr<Fade>()>> makeFadeFuncs = {
[]() -> std::unique_ptr<Fade> { return std::make_unique<Fade1>(); },
[]() -> std::unique_ptr<Fade> { return std::make_unique<Fade2>(); },
[]() -> std::unique_ptr<Fade> { return std::make_unique<Fade3>(); },
[]() -> std::unique_ptr<Fade> { return std::make_unique<Fade4>(); },
};
return Sample(makeFadeFuncs)();
}
class Scene1 : public App::Scene
{
public:
Scene1(const InitData& init)
: IScene{ init }
{
}
void update() override
{
if (MouseL.down())
{
changeScene(U"Scene2");
}
}
void draw() const override
{
Scene::SetBackground(ColorF{ U"#679abc" });
FontAsset(U"SceneName")(this->getState()).drawAt(Scene::Center());
}
void drawFadeIn(double t) const override
{
draw();
m_fadeInFunction->fade(1 - t);
}
void drawFadeOut(double t) const override
{
draw();
m_fadeOutFunction->fade(t);
}
private:
std::unique_ptr<Fade> m_fadeInFunction = randomFade();
std::unique_ptr<Fade> m_fadeOutFunction = randomFade();
};
class Scene2 : public App::Scene
{
public:
Scene2(const InitData& init)
: IScene{ init }
{
}
void update() override
{
if (MouseL.down())
{
changeScene(U"Scene1");
}
}
void draw() const override
{
Scene::SetBackground(ColorF(U"#a167bc"));
FontAsset(U"SceneName")(this->getState()).drawAt(Scene::Center());
}
void drawFadeIn(double t) const override
{
draw();
m_fadeInFunction->fade(1 - t);
}
void drawFadeOut(double t) const override
{
draw();
m_fadeOutFunction->fade(t);
}
private:
std::unique_ptr<Fade> m_fadeInFunction = randomFade();
std::unique_ptr<Fade> m_fadeOutFunction = randomFade();
};
void Main_various_fade()
{
FontAsset::Register(U"SceneName", 64, Typeface::Heavy);
App manager;
manager.add<Scene1>(U"Scene1");
manager.add<Scene2>(U"Scene2");
while (System::Update())
{
if (not manager.update())
{
break;
}
}
}