画面外からぬるっと現れるビューポート

https://gyazo.com/9d298f2c70123d44a65855a1f707facc

code:w.cpp

# include <Siv3D.hpp> // OpenSiv3D v0.6.11

class SubWindow

{

Vec2 m_size;

Vec2 m_pos;

Vec2 m_posTo;

Vec2 m_vel;

Font m_font;

public:

SubWindow() :

m_size(700, 500),

m_pos(-m_size.x - 100, Scene::Height() / 2 - m_size.y / 2),

m_posTo(m_pos),

m_vel(),

m_font(56, Typeface::Bold)

{

}

void show()

{

m_posTo.x = Scene::Width() / 2 - m_size.x / 2;

}

void hide()

{

m_posTo.x = -m_size.x - 100;

}

void update()

{

m_pos = Math::SmoothDamp(m_pos, m_posTo, m_vel, 0.1, unspecified, Scene::DeltaTime());

}

void draw() const

{

const ScopedViewport2D viewport{ m_pos.asPoint(), m_size.asPoint() };

// ウィンドウ背景、枠

RectF(m_size)

.draw(ColorF(0, 0.80))

.drawFrame(8.0, Palette::Dodgerblue);

// ウィンドウの内容

const auto f = m_font(U"サブウィンドウだよ");

f.drawAt(m_size / 2 + Vec2(4, 4), ColorF(0.6, 0.5));

f.drawAt(m_size / 2, Palette::White);

}

};

void Main()

{

Scene::SetBackground(ColorF(0.95, 0.95, 0.95));

Font font(40, Typeface::Bold);

SubWindow wnd;

while (System::Update())

{

font(U"Spaceキーでサブウィンドウ表示").drawAt(Scene::CenterF(), Palette::Gray);

if (KeySpace.down())

{

wnd.show();

}

else if (KeySpace.up())

{

wnd.hide();

}

wnd.update();

wnd.draw();

}

}