particle POC

1 files changed, 40 insertions, 0 deletions

diff --git a/src/crepe/ParticleEmitter.cpp b/src/crepe/ParticleEmitter.cpp
new file mode 100644
index 0000000..13aaeae
--- /dev/null
+++ b/src/crepe/ParticleEmitter.cpp
@@ -0,0 +1,40 @@
+#include "ParticleEmitter.hpp"
+
+ParticleEmitter::ParticleEmitter(int maxParticles, float emissionRate)
+    : maxParticles(maxParticles), emissionRate(emissionRate), elapsedTime(0.0f) {
+    position = { 0, 0 };  
+    std::srand(static_cast<unsigned int>(std::time(nullptr))); /
+}
+
+void ParticleEmitter::update(float deltaTime) {
+    elapsedTime += deltaTime;
+
+    while (elapsedTime >= (1.0f / emissionRate) && particles.size() < maxParticles) {
+        elapsedTime -= (1.0f / emissionRate);
+        emitParticle();
+    }
+
+    for (auto it = particles.begin(); it != particles.end();) {
+        it->update(deltaTime);
+        if (!it->isAlive()) {
+            it = particles.erase(it); 
+        } else {
+            ++it;
+        }
+    }
+}
+
+void ParticleEmitter::emitParticle() {
+    Particle::Position initialPosition = { position.x, position.y };
+    Particle::Position initialVelocity = {
+        static_cast<int>(randFloat(-50.0f, 50.0f, 10.0f, 100.0f)), 
+        static_cast<int>(randFloat(-50.0f, 50.0f, 10.0f, 100.0f))
+    };
+    particles.emplace_back(2.0f, initialPosition, initialVelocity); 
+}
+
+float ParticleEmitter::randFloat(float minangle, float maxangle, float minVel, float maxVel) {
+    float angle = static_cast<float>(rand()) / RAND_MAX * (maxangle - minangle) + minangle;
+    float velocity = static_cast<float>(rand()) / RAND_MAX * (maxVel - minVel) + minVel;
+    return velocity * std::cos(angle); 
+}