diff options
Diffstat (limited to 'src/crepe/system/ParticleSystem.cpp')
| -rw-r--r-- | src/crepe/system/ParticleSystem.cpp | 159 |
1 files changed, 123 insertions, 36 deletions
diff --git a/src/crepe/system/ParticleSystem.cpp b/src/crepe/system/ParticleSystem.cpp index 397b586..23534a3 100644 --- a/src/crepe/system/ParticleSystem.cpp +++ b/src/crepe/system/ParticleSystem.cpp @@ -1,62 +1,149 @@ #include <cmath> #include <ctime> +#include <cstdlib> -#include "../ComponentManager.h" -#include "../api/ParticleEmitter.h" +#include "api/ParticleEmitter.h" +#include "api/Vector2.h" +#include "ComponentManager.h" #include "ParticleSystem.h" using namespace crepe; -ParticleSystem::ParticleSystem() : elapsed_time(0.0f) {} +ParticleSystem::ParticleSystem() {} void ParticleSystem::update() { + + // Get all emitters ComponentManager & mgr = ComponentManager::get_instance(); std::vector<std::reference_wrapper<ParticleEmitter>> emitters = mgr.get_components_by_type<ParticleEmitter>(); - float delta_time = 0.10; + for (ParticleEmitter & emitter : emitters) { - float update_amount = 1 / static_cast<float>(emitter.emission_rate); - for (float i = 0; i < delta_time; i += update_amount) { - emit_particle(emitter); + + // Get transform linked to emitter + const Transform& transform = mgr.get_components_by_id<Transform>(emitter.GAME_OBJECT_ID).front().get(); + + // Check if within boundary + check_bounds(emitter,transform); + + // Emit particles based on emission_rate + int updates = calculate_update(this->update_count,emitter.data.emission_rate); + for (size_t i = 0; i < updates; i++) + { + emit_particle(emitter,transform); } - for (size_t j = 0; j < emitter.particles.size(); j++) { - if (emitter.particles[j].active) { - emitter.particles[j].update(delta_time); + + // Update all particles + for (size_t j = 0; j < emitter.data.particles.size(); j++) { + if (emitter.data.particles[j].active) { + emitter.data.particles[j].update(); } } } + update_count++; + if(update_count == MAX_UPDATE_COUNT) update_count = 0; } -void ParticleSystem::emit_particle(ParticleEmitter & emitter) { - Position initial_position = {emitter.position.x, emitter.position.y}; - float random_angle = 0.0f; - if (emitter.max_angle < emitter.min_angle) { - random_angle = ((emitter.min_angle - + (std::rand() - % (static_cast<uint32_t>(emitter.max_angle + 360 - - emitter.min_angle + 1)))) - % 360); +void ParticleSystem::emit_particle(ParticleEmitter & emitter,const Transform& transform) { + constexpr double DEG_TO_RAD = M_PI / 180.0; + + Vector2 initial_position = emitter.data.position + transform.position; + double min_angle = emitter.data.min_angle; + double max_angle = emitter.data.max_angle; + double random_angle; + + if (min_angle <= max_angle) { + // Standard range (e.g., 10 to 20 degrees) + double angle_offset = max_angle - min_angle; + random_angle = min_angle + static_cast<double>(std::rand() % static_cast<uint32_t>(angle_offset)); } else { - random_angle = emitter.min_angle - + (std::rand() - % (static_cast<uint32_t>(emitter.max_angle - - emitter.min_angle + 1))); + // Wrap-around range (e.g., 350 to 10 degrees) + double angle_offset = (360 - min_angle) + max_angle; + random_angle = min_angle + static_cast<double>(std::rand() % static_cast<uint32_t>(angle_offset)); + + // Wrap around to keep random_angle within 0-360 degrees + if (random_angle >= 360) { + random_angle -= 360; + } } - float angle_in_radians = random_angle * (M_PI / 180.0f); - float random_speed_offset = (static_cast<float>(std::rand()) / RAND_MAX) - * (2 * emitter.speed_offset) - - emitter.speed_offset; - float velocity_x - = (emitter.speed + random_speed_offset) * std::cos(angle_in_radians); - float velocity_y - = (emitter.speed + random_speed_offset) * std::sin(angle_in_radians); - Position initial_velocity = {velocity_x, velocity_y}; - for (size_t i = 0; i < emitter.particles.size(); i++) { - if (!emitter.particles[i].active) { - emitter.particles[i].reset(emitter.end_lifespan, initial_position, - initial_velocity); + + // Generate a random speed between min_speed and max_speed + double speed_offset = emitter.data.max_speed - emitter.data.min_speed; + double random_speed = emitter.data.min_speed + static_cast<double>(std::rand() % static_cast<uint32_t>(speed_offset)); + + // Convert random_angle to radians + double angle_radians = random_angle * DEG_TO_RAD; + + Vector2 velocity = { + random_speed * std::cos(angle_radians), + random_speed * std::sin(angle_radians) + }; + + + for (size_t i = 0; i < emitter.data.particles.size(); i++) { + if (!emitter.data.particles[i].active) { + emitter.data.particles[i].reset(emitter.data.end_lifespan, initial_position,velocity,random_angle); break; } } } + +int ParticleSystem::calculate_update(int count, double emission) { + + //get interger part of the emission + double integer_part = std::floor(emission); + + // Get the fractional part of the emission + double fractional_part = emission - integer_part; + + // Convert the fractional part to a denominator value + int denominator = static_cast<int>(1.0 / fractional_part); + + // For emissions like 0.01, 0.1, 0.5, etc., calculate the update frequency + if (fractional_part > 0) { + // Calculate how often the update should be triggered based on the fractional part + if (count % denominator == 0) { + return 1; + } else { + return 0; + } + } + + // For integer emissions, return the emission directly + return static_cast<int>(emission); +} + +void ParticleSystem::check_bounds(ParticleEmitter & emitter,const Transform& transform) +{ + Vector2 offset = emitter.data.boundary.boundary_offset + transform.position + emitter.data.position; + double half_width = emitter.data.boundary.boundary_width / 2.0; + double half_height = emitter.data.boundary.boundary_height / 2.0; + + // Define boundary edges + const double left = offset.x - half_width; + const double right = offset.x + half_width; + const double top = offset.y - half_height; + const double bottom = offset.y + half_height; + + std::vector<Particle>& particles = emitter.data.particles; + for (Particle& particle : particles) + { + const Vector2& position = particle.position; + + // Check if particle is within bounds + bool within_bounds = (position.x >= left && position.x <= right && position.y >= top && position.y <= bottom); + if (!within_bounds) + { + if (emitter.data.boundary.reset_on_exit) + { + particle.active = false; + } + else + { + particle.velocity = {0, 0}; + //todo add that particle goes back to boundary + } + } + } +} |