爆発エフェクト

https://scrapbox.io/files/64d38a9de27243001b8eff40.png

code:爆発エフェクト.cpp

# include <Siv3D.hpp>

struct ExplosionEffect : IEffect

{

ParticleSystem2D particleSystem;

ParticleSystem2DParameters parameters;

//Vec2 位置　double 大きさ　ColorF 色

explicit ExplosionEffect(const Vec2& pos, double size = 100, const ColorF& color = HSV{ 20,0.8,1 }) {

if (not TextureAsset::IsRegistered(U"particle"))

{

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

}

CircleEmitter2D emitter;

emitter.r = size * 0.35;

parameters.startSize = size;

parameters.startSpeed = size;

parameters.startColor = color;

particleSystem.setEmitter(emitter);

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

particleSystem.setParameters(parameters);

particleSystem.setPosition(pos);

particleSystem.prewarm();

}

bool update(double t) override

{

parameters.rate = t < 0.2 ? 100 : 0;

particleSystem.setParameters(parameters);

particleSystem.update();

particleSystem.draw();

return (t < 1.0);

}

};

void Main()

{

Effect effect;

while (System::Update())

{

if (MouseL.down())

{

effect.add<ExplosionEffect>(Cursor::Pos());

}

effect.update();

}

}