ウィンドウ上で画像の四隅をつかんで拡大縮小したり、画像をつかんで位置を変更したりするサンプルプログラム等はありますか？

サンプルです

# include <Siv3D.hpp>

class Item
{
private:

	RectF m_rect = { 0,0 };

	int32 m_boxSize = 0;

	Optional<int32> m_select;

	RectF tl() const
	{
		return RectF(m_boxSize).setCenter(m_rect.tl);
	}

	RectF tr() const
	{
		return RectF(m_boxSize).setCenter(m_rect.tr);
	}

	RectF bl() const
	{
		return RectF(m_boxSize).setCenter(m_rect.bl);
	}

	RectF br() const
	{
		return RectF(m_boxSize).setCenter(m_rect.br);
	}

public:

	Item() = default;

	explicit Item(const RectF& rect, int32 boxSize = 12)
		: m_rect(rect)
		, m_boxSize(boxSize) {}

	void update()
	{
		if (Input::MouseL.released)
		{
			m_select.reset();
		}

		if (m_select)
		{
			const Point delta = Mouse::Delta();

			switch (m_select.value())
			{
			case 0:
				m_rect.pos += delta;
				m_rect.size -= delta;
				break;
			case 1:
				m_rect.w += delta.x;
				m_rect.y += delta.y;
				m_rect.h -= delta.y;
				break;
			case 2:
				m_rect.x += delta.x;
				m_rect.w -= delta.x;
				m_rect.h += delta.y;
				break;
			case 3:
				m_rect.size += delta;
				break;
			case 4:
				m_rect.moveBy(delta);
				break;
			}
		}
		else
		{
			if (tl().leftClicked)
			{
				m_select = 0;
			}
			else if (tr().leftClicked)
			{
				m_select = 1;
			}
			else if (bl().leftClicked)
			{
				m_select = 2;
			}
			else if (br().leftClicked)
			{
				m_select = 3;
			}
			else if (m_rect.leftClicked)
			{
				m_select = 4;
			}
		}
	}

	void draw(const Texture& texutre) const
	{
		m_rect(texutre).draw();
	
		if (!tl().mouseOver && !tr().mouseOver && !bl().mouseOver && !br().mouseOver && m_rect.mouseOver)
		{
			m_rect.drawFrame(2, 2, Color(255, 128));
		}
		
		tl().draw(tl().mouseOver ? Palette::Yellow : Palette::White).drawFrame(1, 0, Palette::Black);
		tr().draw(tr().mouseOver ? Palette::Yellow : Palette::White).drawFrame(1, 0, Palette::Black);
		bl().draw(bl().mouseOver ? Palette::Yellow : Palette::White).drawFrame(1, 0, Palette::Black);
		br().draw(br().mouseOver ? Palette::Yellow : Palette::White).drawFrame(1, 0, Palette::Black);
	}
};

void Main()
{
	const Texture texture(L"Example/Windmill.png", TextureDesc::Mipped);

	Item item(Rect(100, 60, texture.size));

	while (System::Update())
	{
		item.update();

		item.draw(texture);
	}
}

ありがとうございます