(旧Siv3D) 図形のモーフィング

https://gyazo.com/44659b5ade37ecf14814107a2c7bce4d

code:morph.cpp

void Main()

{

Window::Resize(720, 720);

Graphics::SetBackground(Palette::Black);

// 分割数

const int N_VTX = 48;

// 円の頂点

Array<Vec2> vtxCircle;

for (int i : step(N_VTX))

{

vtxCircle.emplace_back(90.0 * cos(TwoPi * i / N_VTX - QuarterPi), 90.0 * sin(TwoPi * i / N_VTX - QuarterPi));

}

// 長方形の頂点

Array<Vec2> vtxRect;

for (int i : step(N_VTX / 4)) { vtxRect.emplace_back(100.0, -100.0 + 200.0 * i / (N_VTX / 4)); }

for (int i : step(N_VTX / 4)) { vtxRect.emplace_back(100.0 - 200.0 * i / (N_VTX / 4), 100.0); }

for (int i : step(N_VTX / 4)) { vtxRect.emplace_back(-100.0, 100.0 - 200.0 * i / (N_VTX / 4)); }

for (int i : step(N_VTX / 4)) { vtxRect.emplace_back(-100.0 + 200.0 * i / (N_VTX / 4), -100.0); }

// モーフィング中の頂点

Array<Vec2> vtxMorph(N_VTX);

Array<Vec2> vtxMorph2(N_VTX);

while (System::Update())

{

const double F = static_cast<double>(System::FrameCount());

const double t = Clamp(Sin(F * 0.075) * 0.5 + 0.5, 0.0, 1.0);

const double easing = EaseInOut(Easing::Quad, t);

for (int i : step(N_VTX))

{

}

Polygon(vtxMorph).rotated(F * 0.01).scale(2.0).moveBy(Window::Center()).draw(HSV(F * 0.3 + 45 * easing));

Polygon(vtxMorph2).rotated(-F * 0.03).moveBy(Window::Center()).draw(Palette::Black);

}

}