出現エフェクト

https://scrapbox.io/files/64db81ee3633fe001cb45575.png

code:出現エフェクト.cpp

# include <Siv3D.hpp>

struct AppearedEffect : IEffect

{

ParticleSystem2D particleSystem;

ParticleSystem2DParameters parameters;

double rate;

// このコンストラクタ引数が、Effect::add<RingEffect>() の引数になる

explicit AppearedEffect(const Polygon& polygon, const Vec2& pos, const ColorF& color = HSV{ 180,0.8,1 }, double size = 100, double rate = 500)

:rate{ rate }

{

TextureAsset::Register(U"particle", U"example/particle.png");

PolygonEmitter2D emitter{ polygon };

parameters.startSize = size;

parameters.startColor = color;

parameters.rate = 0;

particleSystem.setEmitter(emitter);

particleSystem.setTexture(TextureAsset(U"particle"));

particleSystem.setParameters(parameters);

particleSystem.setPosition(pos);

particleSystem.prewarm();

}

bool update(double t) override

{

if (2.0 < t)parameters.rate = 0;

else parameters.rate = t * rate;

particleSystem.setParameters(parameters);

particleSystem.update();

particleSystem.draw();

return (t < 3.0);

}

};

Polygon CreatePolygon()

{

return Image{ U"example/siv3d-kun.png" }

.alphaToPolygonCentered().simplified(1);

}

void Main()

{

Effect effect;

Polygon polygon = CreatePolygon();

Vec2 position = Scene::Center();

Texture siv3dkun{ U"example/siv3d-kun.png" };

Timer timer{ 2s };

bool appearedFlg = false;

while (System::Update())

{

if (MouseL.down())

{

effect.add<AppearedEffect>(polygon, position);

appearedFlg ^= true;

timer.restart();

}

if (timer.isRunning()^ appearedFlg) {

siv3dkun.drawAt(position);

}

effect.update();

}

}