Geometry2D::Subtractのテスト

gistfile1.txt

# include <Siv3D.hpp> // OpenSiv3D v0.4.0

void Main()
{
	RectF r1(100, 100, 300, 300);
	RectF r2(50, 50, 50, 50);
	RectF r3(150, 150, 50, 50);

	Scene::SetBackground(Palette::Skyblue);

	while (System::Update())
	{
		Polygon polygon(r1.asPolygon());
		ClearPrint();
		Print << Geometry2D::Subtract(polygon, r2.asPolygon()).size();
		polygon = Geometry2D::Subtract(polygon, r2.asPolygon()).front();
		
		// 表示
		Geometry2D::Subtract(polygon, r3.asPolygon()).back().movedBy(350, 0).draw(ColorF(Palette::Red, 0.5)).drawWireframe(1.0, Palette::Red);
		
		Print << Geometry2D::Subtract(polygon, r3.asPolygon()).size();
		polygon = Geometry2D::Subtract(polygon, r3.asPolygon()).front();


		r2.setCenter(Cursor::PosF());

		r1.drawFrame(2.0, Palette::Black);
		r2.drawFrame(2.0, Palette::Black);
		r3.drawFrame(2.0, Palette::Black);

		polygon.draw(ColorF(Palette::Red, 0.5));
		polygon.drawWireframe(1.0, Palette::Red);
	}
}