#pragma once #include <cmath> #include <vector> #include "system/ParticleSystem.h" #include "system/RenderSystem.h" #include "Component.h" #include "Particle.h" #include "types.h" namespace crepe { class Sprite; /** * \brief Data holder for particle emission parameters. * * The ParticleEmitter class stores configuration data for particle properties, defining the * characteristics and boundaries of particle emissions. */ class ParticleEmitter : public Component { public: /** * \brief Defines the boundary within which particles are constrained. * * This structure specifies the boundary's size and offset, as well as the behavior of * particles upon reaching the boundary limits. */ struct Boundary { //! boundary width (midpoint is emitter location) float width = INFINITY; //! boundary height (midpoint is emitter location) float height = INFINITY; //! boundary offset from particle emitter location vec2 offset; //! reset on exit or stop velocity and set max postion bool reset_on_exit = false; }; //! sprite reference of displayed sprite const Sprite & sprite; /** * \brief Holds parameters that control particle emission. * * Contains settings for the emitter’s position, particle speed, angle, lifespan, boundary, * and the sprite used for rendering particles. */ struct Data { //! offset of the emitter relative to transform vec2 offset; //! maximum number of particles const unsigned int max_particles = 256; //! rate of particle emission per second float emission_rate = 50; //! min speed of the particles float min_speed = 100; //! min speed of the particles float max_speed = 100; //! min angle of particle emission float min_angle = 0; //! max angle of particle emission float max_angle = 0; //! begin Lifespan of particle in seconds (only visual) float begin_lifespan = 0.0; //! end Lifespan of particle in seconds float end_lifespan = 10.0; //! force over time (physics) vec2 force_over_time; //! particle boundary Boundary boundary; }; public: /** * \param game_object_id Identifier for the game object using this emitter. * \param data Configuration data defining particle properties. */ ParticleEmitter(game_object_id_t game_object_id, const Sprite & sprite, const Data & data); public: //! Configuration data for particle emission settings. Data data; private: //! Only ParticleSystem can move and read particles friend ParticleSystem; //! Only RenderSystem can read particles friend RenderSystem; //! Saves time left over from last update event. float spawn_accumulator = 0; //! collection of particles std::vector<Particle> particles; }; } // namespace crepe