105 lines
4.1 KiB
C
105 lines
4.1 KiB
C
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//
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// Created by SeanOMik on 3/21/2021.
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// Github: https://github.com/SeanOMik
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// Email: seanomik@gmail.com
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//
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#ifndef SIMPLEENGINE_PARTICLE_EMITTER_H
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#define SIMPLEENGINE_PARTICLE_EMITTER_H
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#include "../event.h"
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#include "particle_property.h"
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#include "particle.h"
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#include "../random.h"
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#include "../range_2.h"
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#include <SFML/Graphics/Rect.hpp>
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#include <SFML/Graphics/RectangleShape.hpp>
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#include <SFML/Graphics/Sprite.hpp>
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#include <SFML/System/Clock.hpp>
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#include <SFML/System/Vector2.hpp>
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#include <iostream>
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namespace simpleengine {
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namespace particle {
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struct ParticleAttributes {
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uint32_t lifetime_ms;
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sf::Vector2f start_velocity;
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float rotation_velocity = 0;
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sf::Vector2f scale = sf::Vector2f(1, 1);
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/* ParticleAttributes(uint32_t lifetime_ms, sf::Vector2f start_velocity, float rotation_velocity) : lifetime_ms(lifetime_ms), start_velocity(start_velocity), rotation_velocity(rotation_velocity) {
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} */
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};
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class ParticleEmitter : public simpleengine::Event {
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protected:
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using ParticlePropertyPtr = std::shared_ptr<simpleengine::particle::ParticleProperty>;
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using ParticlePropertyVector = std::vector<ParticlePropertyPtr>;
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public:
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explicit ParticleEmitter(sf::Texture& texture, sf::Vector2f position, double emit_variance, uint32_t emit_count, uint32_t particle_count, Range2f particle_range, ParticleAttributes attributes, ParticlePropertyVector& properties)
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: texture(texture), position(position), emit_variance(emit_variance), emit_count(emit_count), particle_count(particle_count), particle_range(particle_range), attributes(attributes), properties(properties) {
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time.restart();
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}
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void SetProperties(ParticlePropertyVector& properties) {
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this->properties = properties;
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}
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virtual void Update(const float& delta_time) override {
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for (std::vector<simpleengine::particle::Particle>::iterator it = particles.begin(); it != particles.end(); ) {
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it->Update(delta_time);
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if (it->IsDestroying()) {
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it = particles.erase(it);
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} else {
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it++;
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}
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}
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if (particles.size() < particle_count) {
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if (random.NextInRange(0, 1) < emit_variance) {
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for (uint32_t i = 0; i < emit_count; i++) {
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Particle particle(texture, attributes.start_velocity, attributes.lifetime_ms, attributes.rotation_velocity, properties);
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// Offset the position of the particle randomly
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sf::Vector2f new_pos;
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new_pos.x = random.NextInRange(particle_range.min_x, particle_range.max_x);
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new_pos.y = random.NextInRange(particle_range.min_y, particle_range.max_y);
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new_pos += position;
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particle.GetSprite().setPosition(new_pos);
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particle.GetSprite().setScale(attributes.scale.x, attributes.scale.y);
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particles.emplace_back(std::move(particle));
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}
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}
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}
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}
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virtual void Render(sf::RenderTarget* target) override {
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for (simpleengine::particle::Particle particle : particles) {
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particle.Render(target);
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}
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}
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protected:
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sf::Texture& texture;
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sf::Vector2f position;
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double emit_variance;
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uint32_t emit_count;
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uint32_t particle_count;
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Range2f particle_range;
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ParticleAttributes attributes;
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ParticlePropertyVector& properties;
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std::vector<simpleengine::particle::Particle> particles;
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sf::Clock time;
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simpleengine::Random<double> random;
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};
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}
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}
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#endif //SIMPLEENGINE_PARTICLE_EMITTER_H
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