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#include "ParticleSystem.h"
#include <cmath>
// #include <cstdlib>
#include <ctime>
#include <iostream> // include iostream for std::cout
#include "ParticleEmitter.h"
#include "Particle.h"
using namespace crepe;
ParticleSystem::ParticleSystem() : m_elapsedTime(0.0f) {} // Initialize m_elapsedTime to 0
void ParticleSystem::update(float deltaTime, std::vector<ParticleEmitter>& emitters) {
// std::cout << "ParticleSystem update" << std::endl;
for (ParticleEmitter& emitter : emitters) {
float updateAmount = 1/static_cast<float>(emitter.m_emissionRate);
for (float i = 0; i < deltaTime; i += updateAmount)
{
emitParticle(emitter);
}
// std::cout << "after emit" << std::endl;
//update/move particles afterwards delete if not alive.
for (size_t j = 0; j < emitter.particles.size(); j++)
{
// std::cout << "update" << std::endl;
if(emitter.particles[j].active)
{
emitter.particles[j].update(deltaTime);
}
}
}
}
void ParticleSystem::emitParticle(ParticleEmitter& emitter) {
// std::cout << "new emitter:" << std::endl;
Position initialPosition = { emitter.m_position.x, emitter.m_position.y };
float randomAngle = 0.0f;
//check if value is overthe 360 degrees
if(emitter.m_maxAngle < emitter.m_minAngle)
{
randomAngle = ((emitter.m_minAngle + (std::rand() % (static_cast<uint32_t>(emitter.m_maxAngle + 360 - emitter.m_minAngle + 1))))%360);
}
else
{
randomAngle = emitter.m_minAngle + (std::rand() % (static_cast<uint32_t>(emitter.m_maxAngle - emitter.m_minAngle + 1)));
}
float angleInRadians = randomAngle * (M_PI / 180.0f);
float randomSpeedOffset = (static_cast<float>(std::rand()) / RAND_MAX) * (2 * emitter.m_speedOffset) - emitter.m_speedOffset;
float velocityX = (emitter.m_speed + randomSpeedOffset) * std::cos(angleInRadians);
float velocityY = (emitter.m_speed + randomSpeedOffset) * std::sin(angleInRadians);
Position initialVelocity = {
velocityX,
velocityY
};
// std::cout << "emitter.m_endLifespan:" << emitter.m_endLifespan << std::endl;
for (size_t i = 0; i < emitter.particles.size(); i++)
{
if(!emitter.particles[i].active)
{
// std::cout << "active " << emitter.particles[i].active << std::endl;
// std::cout << "lifespan " << emitter.particles[i].lifespan << std::endl;
// std::cout << "timeInLife " << emitter.particles[i].timeInLife << std::endl;
// std::cout << "emitter.m_endLifespan" << emitter.m_endLifespan << std::endl;
// std::cout << "initialPositionx" << initialPosition.x << std::endl;
// std::cout << "initialPositiony" << initialPosition.y << std::endl;
// std::cout << "initialVelocityx" << initialVelocity.x << std::endl;
// std::cout << "initialVelocityy" << initialVelocity.y << std::endl;
emitter.particles[i].reset(emitter.m_endLifespan, initialPosition, initialVelocity);
break;
}
}
//emitter.particles.emplace_back(emitter.m_endLifespan, initialPosition, initialVelocity);
}
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