火花

https://scrapbox.io/files/64cf9352460d43001cf2b0f3.png

code:火花.cpp

# include <Siv3D.hpp>

class SparkParticle {

public:

ParticleSystem2D particleSystem;

ParticleSystem2DParameters parameters;

ArcEmitter2D arcEmitter;

SparkParticle() {

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

{

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

}

parameters.rate = 50;

parameters.startLifeTime = 0.5;

arcEmitter.direction = 80;

arcEmitter.angle = 20;

parameters.startSpeed = 300;

parameters.startColor = Palette::Orange;

particleSystem.setEmitter(arcEmitter);

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

particleSystem.setParameters(parameters);

particleSystem.prewarm();

}

//位置を設定

void setPosition(const Vec2& pos) {

particleSystem.setPosition(pos);

}

//角度を設定

void setDirection(double direction) {

if (arcEmitter.direction != direction) {

arcEmitter.direction = direction;

particleSystem.setEmitter(arcEmitter);

}

}

//量を設定

void setRate(double rate) {

parameters.rate = rate;

}

//速さを設定

void setSpeed(double speed) {

parameters.startSpeed = speed;

}

//色を設定

void setColor(const ColorF& color) {

parameters.startColor = color;

}

//更新(毎フレーム呼び出す)

void update() {

particleSystem.setParameters(parameters);

particleSystem.update();

}

//描画

void draw()const {

particleSystem.draw();

}

};

void Main()

{

SparkParticle spark;

while (System::Update())

{

Circle{ Cursor::Pos().x,300,50 }.draw(Palette::Skyblue);

Rect{ 0,350,800,250 }.draw(Palette::Gray);

spark.setDirection(Cursor::Delta().x < 0 ? 80 : -80);

spark.setPosition({ Cursor::Pos().x,350 });

spark.setRate(Abs(Cursor::Delta().x) * 50);

spark.update();

spark.draw();

}

}