Merge branch 'jaro/poc-physics' into niels/rendering

1 files changed, 59 insertions, 0 deletions

diff --git a/src/crepe/ParticleSystem.cpp b/src/crepe/ParticleSystem.cpp
new file mode 100644
index 0000000..0dad4cd
--- /dev/null
+++ b/src/crepe/ParticleSystem.cpp
@@ -0,0 +1,59 @@
+#include "ParticleSystem.h"
+#include <cmath>
+#include <ctime>
+#include "ParticleEmitter.h"
+#include "Particle.h"
+#include "ComponentManager.h"
+
+using namespace crepe;
+
+ParticleSystem::ParticleSystem() : m_elapsedTime(0.0f) {}  // Initialize m_elapsedTime to 0
+
+void ParticleSystem::update() {
+	ComponentManager& mgr = ComponentManager::get_instance();
+	std::vector<std::reference_wrapper<ParticleEmitter>> emitters = mgr.get_components_by_type<ParticleEmitter>();
+	float deltaTime = 0.10;
+    for (ParticleEmitter& emitter : emitters) {
+        float updateAmount = 1/static_cast<float>(emitter.m_emissionRate);
+        for (float i = 0; i < deltaTime; i += updateAmount)
+        {
+            emitParticle(emitter);
+        }
+        for (size_t j = 0; j <  emitter.particles.size(); j++)
+        {
+            if(emitter.particles[j].active)
+            {
+                emitter.particles[j].update(deltaTime);
+            }
+        }     
+    }
+}
+
+void ParticleSystem::emitParticle(ParticleEmitter& emitter) {
+    Position initialPosition = { emitter.m_position.x, emitter.m_position.y};
+    float randomAngle = 0.0f;
+    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
+    };
+    for (size_t i = 0; i < emitter.particles.size(); i++)
+    {
+        if(!emitter.particles[i].active)
+        {
+            emitter.particles[i].reset(emitter.m_endLifespan, initialPosition, initialVelocity);
+            break;
+        }
+    }
+}